Electropositive chemical elements characterized by ductility, malleability, luster, and conductance of heat and electricity. They can replace the hydrogen of an acid and form bases with hydroxyl radicals. (Grant & Hackh's Chemical Dictionary, 5th ed)
A metallic element of atomic number 30 and atomic weight 65.38. It is a necessary trace element in the diet, forming an essential part of many enzymes, and playing an important role in protein synthesis and in cell division. Zinc deficiency is associated with ANEMIA, short stature, HYPOGONADISM, impaired WOUND HEALING, and geophagia. It is known by the symbol Zn.
Metals that constitute group 1(formerly group Ia) of the periodic table. They are the most strongly electropositive of the metals. Note that HYDROGEN is not considered an alkali metal even though it falls under the group 1 heading in the periodic table.
A trace element that is a component of vitamin B12. It has the atomic symbol Co, atomic number 27, and atomic weight 58.93. It is used in nuclear weapons, alloys, and pigments. Deficiency in animals leads to anemia; its excess in humans can lead to erythrocytosis.
A heavy metal trace element with the atomic symbol Cu, atomic number 29, and atomic weight 63.55.
A trace element with the atomic symbol Ni, atomic number 28, and atomic weight 58.69. It is a cofactor of the enzyme UREASE.
Metals that constitute the group 2 (formerly group IIa) of the periodic table.
A trace element with atomic symbol Mn, atomic number 25, and atomic weight 54.94. It is concentrated in cell mitochondria, mostly in the pituitary gland, liver, pancreas, kidney, and bone, influences the synthesis of mucopolysaccharides, stimulates hepatic synthesis of cholesterol and fatty acids, and is a cofactor in many enzymes, including arginase and alkaline phosphatase in the liver. (From AMA Drug Evaluations Annual 1992, p2035)
Positively charged atoms, radicals or groups of atoms with a valence of plus 2, which travel to the cathode or negative pole during electrolysis.
A trace element that plays a role in glucose metabolism. It has the atomic symbol Cr, atomic number 24, and atomic weight 52. According to the Fourth Annual Report on Carcinogens (NTP85-002,1985), chromium and some of its compounds have been listed as known carcinogens.
A metallic element with atomic symbol Fe, atomic number 26, and atomic weight 55.85. It is an essential constituent of HEMOGLOBINS; CYTOCHROMES; and IRON-BINDING PROTEINS. It plays a role in cellular redox reactions and in the transport of OXYGEN.
A soft, grayish metal with poisonous salts; atomic number 82, atomic weight 207.19, symbol Pb. (Dorland, 28th)
Chemicals that bind to and remove ions from solutions. Many chelating agents function through the formation of COORDINATION COMPLEXES with METALS.
A silver metallic element that exists as a liquid at room temperature. It has the atomic symbol Hg (from hydrargyrum, liquid silver), atomic number 80, and atomic weight 200.59. Mercury is used in many industrial applications and its salts have been employed therapeutically as purgatives, antisyphilitics, disinfectants, and astringents. It can be absorbed through the skin and mucous membranes which leads to MERCURY POISONING. Because of its toxicity, the clinical use of mercury and mercurials is diminishing.
Substances which pollute the soil. Use for soil pollutants in general or for which there is no specific heading.
A group of elements that include SCANDIUM; YTTRIUM; and the LANTHANOID SERIES ELEMENTS. Historically, the rare earth metals got their name from the fact that they were never found in their pure elemental form, but as an oxide. In addition they were very difficult to purify. They are not truly rare and comprise about 25% of the metals in the earth's crust.
An atom or group of atoms that have a positive or negative electric charge due to a gain (negative charge) or loss (positive charge) of one or more electrons. Atoms with a positive charge are known as CATIONS; those with a negative charge are ANIONS.
Neutral or negatively charged ligands bonded to metal cations or neutral atoms. The number of ligand atoms to which the metal center is directly bonded is the metal cation's coordination number, and this number is always greater than the regular valence or oxidation number of the metal. A coordination complex can be negative, neutral, or positively charged.
The fusion of ceramics (porcelain) to an alloy of two or more metals for use in restorative and prosthodontic dentistry. Examples of metal alloys employed include cobalt-chromium, gold-palladium, gold-platinum-palladium, and nickel-based alloys.
A metallic element that has the atomic symbol Mg, atomic number 12, and atomic weight 24.31. It is important for the activity of many enzymes, especially those involved in OXIDATIVE PHOSPHORYLATION.
The parts of a macromolecule that directly participate in its specific combination with another molecule.
Proteins that have one or more tightly bound metal ions forming part of their structure. (Dorland, 28th ed)
Spectrophotometric techniques by which the absorption or emmision spectra of radiation from atoms are produced and analyzed.
Metals with low specific gravity, typically smaller than 5, characterized by a single valence (1, 2, or 3), a simple spectrum, strong electromotive force (positive), and colorless compounds. (From Grant & Hackh's Chemical Dictionary, 5th ed)
The rate dynamics in chemical or physical systems.
A mixture of metallic elements or compounds with other metallic or metalloid elements in varying proportions for use in restorative or prosthetic dentistry.
Chemical compounds which pollute the water of rivers, streams, lakes, the sea, reservoirs, or other bodies of water.
Specific alloys not less than 85% chromium and nickel or cobalt, with traces of either nickel or cobalt, molybdenum, and other substances. They are used in partial dentures, orthopedic implants, etc.
Models used experimentally or theoretically to study molecular shape, electronic properties, or interactions; includes analogous molecules, computer-generated graphics, and mechanical structures.
Positively charged atoms, radicals or groups of atoms which travel to the cathode or negative pole during electrolysis.
Descriptions of specific amino acid, carbohydrate, or nucleotide sequences which have appeared in the published literature and/or are deposited in and maintained by databanks such as GENBANK, European Molecular Biology Laboratory (EMBL), National Biomedical Research Foundation (NBRF), or other sequence repositories.
The science, art, or technology dealing with processes involved in the separation of metals from their ores, the technique of making or compounding the alloys, the techniques of working or heat-treating metals, and the mining of metals. It includes industrial metallurgy as well as metallurgical techniques employed in the preparation and working of metals used in dentistry, with special reference to orthodontic and prosthodontic appliances. (From Jablonski, Dictionary of Dentistry, 1992, p494)
A group of chemical elements that are needed in minute quantities for the proper growth, development, and physiology of an organism. (From McGraw-Hill Dictionary of Scientific and Technical Terms, 4th ed)
The facilitation of a chemical reaction by material (catalyst) that is not consumed by the reaction.
The normality of a solution with respect to HYDROGEN ions; H+. It is related to acidity measurements in most cases by pH = log 1/2[1/(H+)], where (H+) is the hydrogen ion concentration in gram equivalents per liter of solution. (McGraw-Hill Dictionary of Scientific and Technical Terms, 6th ed)
A chelating agent that sequesters a variety of polyvalent cations such as CALCIUM. It is used in pharmaceutical manufacturing and as a food additive.
A metallic element that has the atomic number 13, atomic symbol Al, and atomic weight 26.98.
Stainless steel. A steel containing Ni, Cr, or both. It does not tarnish on exposure and is used in corrosive environments. (Grant & Hack's Chemical Dictionary, 5th ed)
A shiny gray element with atomic symbol As, atomic number 33, and atomic weight 75. It occurs throughout the universe, mostly in the form of metallic arsenides. Most forms are toxic. According to the Fourth Annual Report on Carcinogens (NTP 85-002, 1985), arsenic and certain arsenic compounds have been listed as known carcinogens. (From Merck Index, 11th ed)
The monitoring of the level of toxins, chemical pollutants, microbial contaminants, or other harmful substances in the environment (soil, air, and water), workplace, or in the bodies of people and animals present in that environment.
A dark-gray, metallic element of widespread distribution but occurring in small amounts; atomic number, 22; atomic weight, 47.90; symbol, Ti; specific gravity, 4.5; used for fixation of fractures. (Dorland, 28th ed)
A mixture of metallic elements or compounds with other metallic or metalloid elements in varying proportions.
The order of amino acids as they occur in a polypeptide chain. This is referred to as the primary structure of proteins. It is of fundamental importance in determining PROTEIN CONFORMATION.
A chemical reaction in which an electron is transferred from one molecule to another. The electron-donating molecule is the reducing agent or reductant; the electron-accepting molecule is the oxidizing agent or oxidant. Reducing and oxidizing agents function as conjugate reductant-oxidant pairs or redox pairs (Lehninger, Principles of Biochemistry, 1982, p471).
A class of compounds of the type R-M, where a C atom is joined directly to any other element except H, C, N, O, F, Cl, Br, I, or At. (Grant & Hackh's Chemical Dictionary, 5th ed)
The spectrometric analysis of fluorescent X-RAYS, i.e. X-rays emitted after bombarding matter with high energy particles such as PROTONS; ELECTRONS; or higher energy X-rays. Identification of ELEMENTS by this technique is based on the specific type of X-rays that are emitted which are characteristic of the specific elements in the material being analyzed. The characteristic X-rays are distinguished and/or quantified by either wavelength dispersive or energy dispersive methods.
A rare, metallic element designated by the symbol, Ga, atomic number 31, and atomic weight 69.72.
The study of crystal structure using X-RAY DIFFRACTION techniques. (McGraw-Hill Dictionary of Scientific and Technical Terms, 4th ed)
Alloys that contain a high percentage of gold. They are used in restorative or prosthetic dentistry.
The process in which substances, either endogenous or exogenous, bind to proteins, peptides, enzymes, protein precursors, or allied compounds. Specific protein-binding measures are often used as assays in diagnostic assessments.
Contamination of the air, bodies of water, or land with substances that are harmful to human health and the environment.
A species of gram-negative, facultatively anaerobic, rod-shaped bacteria (GRAM-NEGATIVE FACULTATIVELY ANAEROBIC RODS) commonly found in the lower part of the intestine of warm-blooded animals. It is usually nonpathogenic, but some strains are known to produce DIARRHEA and pyogenic infections. Pathogenic strains (virotypes) are classified by their specific pathogenic mechanisms such as toxins (ENTEROTOXIGENIC ESCHERICHIA COLI), etc.
A chemical element having an atomic weight of 106.4, atomic number of 46, and the symbol Pd. It is a white, ductile metal resembling platinum, and following it in abundance and importance of applications. It is used in dentistry in the form of gold, silver, and copper alloys.
Worthless, damaged, defective, superfluous or effluent material from industrial operations.
The testing of materials and devices, especially those used for PROSTHESES AND IMPLANTS; SUTURES; TISSUE ADHESIVES; etc., for hardness, strength, durability, safety, efficacy, and biocompatibility.
Tungsten. A metallic element with the atomic symbol W, atomic number 74, and atomic weight 183.85. It is used in many manufacturing applications, including increasing the hardness, toughness, and tensile strength of steel; manufacture of filaments for incandescent light bulbs; and in contact points for automotive and electrical apparatus.
The characteristic 3-dimensional shape of a protein, including the secondary, supersecondary (motifs), tertiary (domains) and quaternary structure of the peptide chain. PROTEIN STRUCTURE, QUATERNARY describes the conformation assumed by multimeric proteins (aggregates of more than one polypeptide chain).
A technique applicable to the wide variety of substances which exhibit paramagnetism because of the magnetic moments of unpaired electrons. The spectra are useful for detection and identification, for determination of electron structure, for study of interactions between molecules, and for measurement of nuclear spins and moments. (From McGraw-Hill Encyclopedia of Science and Technology, 7th edition) Electron nuclear double resonance (ENDOR) spectroscopy is a variant of the technique which can give enhanced resolution. Electron spin resonance analysis can now be used in vivo, including imaging applications such as MAGNETIC RESONANCE IMAGING.
An essential amino acid that is required for the production of HISTAMINE.
Conditions associated with damage or dysfunction of the nervous system caused by exposure to heavy metals, which may cause a variety of central, peripheral, or autonomic nervous system injuries.
Substances or energies, for example heat or light, which when introduced into the air, water, or land threaten life or health of individuals or ECOSYSTEMS.
A characteristic feature of enzyme activity in relation to the kind of substrate on which the enzyme or catalytic molecule reacts.
A metallic element with the atomic symbol V, atomic number 23, and atomic weight 50.94. It is used in the manufacture of vanadium steel. Prolonged exposure can lead to chronic intoxication caused by absorption usually via the lungs.
Inorganic compounds that contain zinc as an integral part of the molecule.
Inorganic chemicals that contain manganese as an integral part of the molecule.
Proteins found in any species of bacterium.
Uranium. A radioactive element of the actinide series of metals. It has an atomic symbol U, atomic number 92, and atomic weight 238.03. U-235 is used as the fissionable fuel in nuclear weapons and as fuel in nuclear power reactors.
A trace element that is required in bone formation. It has the atomic symbol Sn, atomic number 50, and atomic weight 118.71.
Spectroscopic method of measuring the magnetic moment of elementary particles such as atomic nuclei, protons or electrons. It is employed in clinical applications such as NMR Tomography (MAGNETIC RESONANCE IMAGING).
The location of the atoms, groups or ions relative to one another in a molecule, as well as the number, type and location of covalent bonds.
The gradual destruction of a metal or alloy due to oxidation or action of a chemical agent. (From McGraw-Hill Dictionary of Scientific and Technical Terms, 6th ed)
A yellow metallic element with the atomic symbol Au, atomic number 79, and atomic weight 197. It is used in jewelry, goldplating of other metals, as currency, and in dental restoration. Many of its clinical applications, such as ANTIRHEUMATIC AGENTS, are in the form of its salts.
Binary compounds of oxygen containing the anion O(2-). The anion combines with metals to form alkaline oxides and non-metals to form acidic oxides.
A tough, malleable, iron-based alloy containing up to, but no more than, two percent carbon and often other metals. It is used in medicine and dentistry in implants and instrumentation.
Theoretical representations that simulate the behavior or activity of chemical processes or phenomena; includes the use of mathematical equations, computers, and other electronic equipment.
Inorganic or organic compounds that contain divalent iron.
Elements of the lanthanoid series including atomic number 57 (LANTHANUM) through atomic number 71 (LUTETIUM).
A plant genus of the family BRASSICACEAE that is grown in rock gardens. T. arvense is grown for its large, round ornamental seed pods. The common name of pennycress usually refers to this genus but may also refer to the genus Microthlaspi.
The property of objects that determines the direction of heat flow when they are placed in direct thermal contact. The temperature is the energy of microscopic motions (vibrational and translational) of the particles of atoms.
RNA that has catalytic activity. The catalytic RNA sequence folds to form a complex surface that can function as an enzyme in reactions with itself and other molecules. It may function even in the absence of protein. There are numerous examples of RNA species that are acted upon by catalytic RNA, however the scope of this enzyme class is not limited to a particular type of substrate.
Adverse effect upon bodies of water (LAKES; RIVERS; seas; groundwater etc.) caused by CHEMICAL WATER POLLUTANTS.
The region of an enzyme that interacts with its substrate to cause the enzymatic reaction.
A metallic element with the atomic symbol Mo, atomic number 42, and atomic weight 95.94. It is an essential trace element, being a component of the enzymes xanthine oxidase, aldehyde oxidase, and nitrate reductase. (From Dorland, 27th ed)
A class of nonmetals such as arsenic that have some of the chemical properties of a metal.
Platinum. A heavy, soft, whitish metal, resembling tin, atomic number 78, atomic weight 195.09, symbol Pt. (From Dorland, 28th ed) It is used in manufacturing equipment for laboratory and industrial use. It occurs as a black powder (platinum black) and as a spongy substance (spongy platinum) and may have been known in Pliny's time as "alutiae".
The sequence of PURINES and PYRIMIDINES in nucleic acids and polynucleotides. It is also called nucleotide sequence.
Inorganic or organic compounds containing trivalent iron.
Beryllium. An element with the atomic symbol Be, atomic number 4, and atomic weight 9.01218. Short exposure to this element can lead to a type of poisoning known as BERYLLIOSIS.
The protein components of enzyme complexes (HOLOENZYMES). An apoenzyme is the holoenzyme minus any cofactors (ENZYME COFACTORS) or prosthetic groups required for the enzymatic function.
Terbium. An element of the rare earth family of metals. It has the atomic symbol Tb, atomic number 65, and atomic weight 158.92.
Ytterbium. An element of the rare earth family of metals. It has the atomic symbol Yb, atomic number 70, and atomic weight 173. Ytterbium has been used in lasers and as a portable x-ray source.
Determination of the spectra of ultraviolet absorption by specific molecules in gases or liquids, for example Cl2, SO2, NO2, CS2, ozone, mercury vapor, and various unsaturated compounds. (McGraw-Hill Dictionary of Scientific and Technical Terms, 4th ed)
Proteins that specifically bind to IRON.
Materials that have a limited and usually variable electrical conductivity. They are particularly useful for the production of solid-state electronic devices.
Rhodium. A hard and rare metal of the platinum group, atomic number 45, atomic weight 102.905, symbol Rh. (Dorland, 28th ed)
Compounds containing the -SH radical.
A potentially neurotoxic 8-hydroxyquinoline derivative long used as a topical anti-infective, intestinal antiamebic, and vaginal trichomonacide. The oral preparation has been shown to cause subacute myelo-optic neuropathy and has been banned worldwide.

Identification and characterization of a recombinant metallothionein protein from a marine alga, Fucus vesiculosus. (1/4151)

A cDNA library was constructed from macroalgae adapted to prolonged elevated environmental copper levels. To investigate the possible existence of a metallothionein (MT) gene, the library was screened with degenerate probes designed using plant MT cysteine-rich motifs. A gene was identified (1229 bp) with a putative open reading frame (204 bp) encoding a 67-amino-acid protein exhibiting several characteristic features of MT proteins, including 16 cysteine residues (24%) and only one aromatic residue. Although the protein sequence showed high identity with plant and invertebrate MTs, it contained a unique 'linker' region (14 amino acid residues) between the two putative metal-binding domains which contained no cysteine residues. This extended linker is larger than the tripeptide found in archetypal vertebrate MTs, but does not conform either with the 40-amino-acid linkers commonly found in plant MT sequences. An S-peptide Fucus MT fusion protein expressed in Escherichia coli exhibited a relative molecular mass of approximately 14 kDa. The recombinant fusion bound seven Cd ions, of which 50% were dissociated at pH 4.1. Under anaerobic conditions, the Cd ions were displaced by Cu(I), which associated with the protein at a ratio of 13:1. Laboratory exposure of F. vesiculosus to elevated copper resulted in induction of the MT gene. Thus this paper describes, for the first time, an MT gene identified from macroalgae which is induced by copper exposure and whose encoded protein product binds cadmium and copper.  (+info)

Interactions of membrane potential and cations in regulation of ciliary activity in Paramecium. (2/4151)

Ciliary activity in Paramecium was investigated in different external solutions using techniques of voltage clamp and high frequency cinematography. An increase in the external concentration of K, Ca or Mg ions decreased the resting potential. It had no effect on ciliary activity. When the membrane potential was fixed, an increase in external Ca or Mg and, to a lesser extent, an increase in K concentration, raised the frequency of normal beating or decreased the frequency of reversed beating of the cilia. Similar effects resulted from membrane hyperpolarization with constant ionic conditions. Increase in concentration of Ca, but not of Mg or K, enhanced hyperpolarization-induced augmentation of ciliary frequency. Increase in Ca concentration also specifically augmented the delayed increase in inward current during rapid hyperpolarizing clamp. The results support the view that [Ca]i regulates the frequency and direction of ciliary beating. It is suggested that the insensitivity of the ciliary motor system to elevations of the external concentrations of ions results from compensation of their effects on [Ca]i. Depolarization itself appears to increase [Ca]i while elevation of the external ion concentrations at a fixed membrane potential appears to decrease [Ca]i.  (+info)

Purification and properties of a low-molecular-weight, high-alkaline pectate lyase from an alkaliphilic strain of Bacillus. (3/4151)

A low-molecular-weight, high-alkaline pectate lyase (pectate transeliminase, EC was found in an alkaline culture of Bacillus sp. strain KSM-P15, purified to homogeneity, and crystallized. The enzyme had a relative molecular weight of approximately 20,300 as measured by sedimentation equilibrium, with a sedimentation coefficient (s20,w0) of 1.73 S. It was a basic protein with an isoelectric point of pH 10.3, and the alpha-helical content was only 6.6%. In the presence of Ca2+ ions, the enzyme degraded polygalacturonic acid in a random manner to yield 4,5-unsaturated oligo-galacturonides and had its optimal activity around pH 10.5 and 50-55 degrees C. It also had a protopectinase-like activity on cotton fibers. The N-terminal amino acid sequences of the intact protein (28 amino acids) and its two lysyl endopeptidase-cleaved peptide fragments (8 and 12 amino acids) had very low sequence similarity with pectate lyases reported to date. These results strongly suggest that the pectate lyase of Bacillus sp. strain KSM-P15 may be a novel enzyme and belongs in a new family.  (+info)

Purification and characterization of Aspergillus ficuum endoinulinase. (4/4151)

Endoinulinase from Aspergillus ficuum, which catalyzes the hydrolysis of inulin via an endo-cleavage mode, was purified by chromatography from Novozym 230 as a starting commercial enzyme mixture on CM-Sephadex and DEAE-Sepharose, and by preparative electrophoresis under native conditions. The enzyme was estimated to be pure on the basis of its I/S ratio, whose value was infinite in our assay conditions. Two forms separated by using this method. SDS gel electrophoresis showed the two purified forms to respectively exhibit molecular weights of 64,000 +/- 500 and 66,000 +/- 1,000. The results of deglycosylation indicated that the two forms were originally the same protein but with different sugar contents. A molecular weight of 54,800 +/- 1,500 was found by gel filtration of the native enzyme, indicating the native functional protein to be a monomer. The enzyme showed nearly absolute substrate specificity towards inulin and inulooligosaccharides, and acted via an endo-attack to produce mainly inulotriose during the late stage of the reaction. The apparent Km and Vmax values for inulin hydrolysis were 8.1 +/- 1.0 mM and 773 +/- 60 U/mg, respectively. The internal peptides of the enzyme showed sequence homology to the endoinulinase of Penicillium purpurogenum.  (+info)

Analysis of 118 second-generation metal-on-metal retrieved hip implants. (5/4151)

Osteolysis is due to particulate wear debris and is responsible for the long-term failure of total hip replacements. It has stimulated the development of alternative joint surfaces such as metal-on-metal or ceramic-on-ceramic implants. Since 1988 the second-generation metal-on-metal implant Metasul has been used in over 60 000 hips. Analysis of 118 retrieved specimens of the head or cup showed rates of wear of approximately 25 microm for the whole articulation per year in the first year, decreasing to about 5 microm per year after the third. Metal surfaces have a 'self-polishing' capacity. Scratches are worn out by further joint movement. Volumetric wear was decreased some 60-fold compared with that of metal-on-polyethylene implants, suggesting that second-generation metal-on-metal prostheses may considerably reduce osteolysis.  (+info)

Adaptation of bulk constitutive equations to insoluble monolayer collapse at the air-water interface. (6/4151)

A constitutive equation based on stress-strain models of bulk solids was adapted to relate the surface pressure, compression rate, and temperature of an insoluble monolayer of monodendrons during collapse at the air-water interface. A power law relation between compression rate and surface pressure and an Arrhenius temperature dependence of the steady-state creep rate were observed in data from compression rate and creep experiments in the collapse region. These relations were combined into a single constitutive equation to calculate the temperature dependence of the collapse pressure with a maximum error of 5 percent for temperatures ranging from 10 degrees to 25 degrees C.  (+info)

SAG, a novel zinc RING finger protein that protects cells from apoptosis induced by redox agents. (7/4151)

SAG (sensitive to apoptosis gene) was cloned as an inducible gene by 1,10-phenanthroline (OP), a redox-sensitive compound and an apoptosis inducer. SAG encodes a novel zinc RING finger protein that consists of 113 amino acids with a calculated molecular mass of 12.6 kDa. SAG is highly conserved during evolution, with identities of 70% between human and Caenorhabditis elegans sequences and 55% between human and yeast sequences. In human tissues, SAG is ubiquitously expressed at high levels in skeletal muscles, heart, and testis. SAG is localized in both the cytoplasm and the nucleus of cells, and its gene was mapped to chromosome 3q22-24. Bacterially expressed and purified human SAG binds to zinc and copper metal ions and prevents lipid peroxidation induced by copper or a free radical generator. When overexpressed in several human cell lines, SAG protects cells from apoptosis induced by redox agents (the metal chelator OP and zinc or copper metal ions). Mechanistically, SAG appears to inhibit and/or delay metal ion-induced cytochrome c release and caspase activation. Thus, SAG is a cellular protective molecule that appears to act as an antioxidant to inhibit apoptosis induced by metal ions and reactive oxygen species.  (+info)

Amyloid beta peptides do not form peptide-derived free radicals spontaneously, but can enhance metal-catalyzed oxidation of hydroxylamines to nitroxides. (8/4151)

Amyloid beta (Abeta) peptides play an important role in the pathogenesis of Alzheimer's disease. Free radical generation by Abeta peptides was suggested to be a key mechanism of their neurotoxicity. Reports that neurotoxic free radicals derived from Abeta-(1-40) and Abeta-(25-35) peptides react with the spin trap N-tert-butyl-alpha-phenylnitrone (PBN) to form a PBN/.Abeta peptide radical adduct with a specific triplet ESR signal assert that the peptide itself was the source of free radicals. We now report that three Abeta peptides, Abeta-(1-40), Abeta-(25-35), and Abeta-(40-1), do not yield radical adducts with PBN from the Oklahoma Medical Research Foundation (OMRF). In contrast to OMRF PBN, incubation of Sigma PBN in phosphate buffer without Abeta peptides produced a three-line ESR spectrum. It was shown that this nitroxide is di-tert-butylnitroxide and is formed in the Sigma PBN solution as a result of transition metal-catalyzed auto-oxidation of the respective hydroxylamine present as an impurity in the Sigma PBN. Under some conditions, incubation of PBN from Sigma with Abeta-(1-40) or Abeta-(25-35) can stimulate the formation of di-tert-butylnitroxide. It was shown that Abeta peptides enhanced oxidation of cyclic hydroxylamine 1-hydroxy-4-oxo-2,2,6, 6-tetramethylpiperidine (TEMPONE-H), which was strongly inhibited by the treatment of phosphate buffer with Chelex-100. It was shown that ferric and cupric ions are effective oxidants of TEMPONE-H. The data obtained allow us to conclude that under some conditions toxic Abeta peptides Abeta-(1-40) and Abeta-(25-35) enhance metal-catalyzed oxidation of hydroxylamine derivatives, but do not spontaneously form peptide-derived free radicals.  (+info)

TY - JOUR. T1 - Efficacy of the Za Self-Expandable Metal Stent for Palliation of Malignant Biliary Obstruction. AU - Varadarajulu, Shyam. AU - Tutuian, Radu. AU - Gostout, Christopher. AU - Kozarek, Richard. AU - Wilcox, C. Mel. AU - Cotton, Peter B.. PY - 2004/1. Y1 - 2004/1. N2 - Background: The efficacy and safety of the uncoated self-expandable Za metal stent for palliation of malignant distal biliary obstruction was prospectively analyzed. Methods: Twenty-one patients with unresectable malignant tumors involving mid to distal common bile duct who presented with obstructive jaundice underwent endoscopic implantation of an uncoated self-expandable metal stent. Technical success with stent placement, adverse events, patient survival, duration of stent patency, and device performance were analyzed. Results: Endoscopic biliary stenting was successful in all patients. No adverse events were encountered. The mean follow-up period of the 21 patients was 128 days (range, 3-263): 14 died of ...
alternative (12) ambient (35) artcore (1) atmospheric black metal (5) atmospheric metal (11) avant-garde black metal (13) Avant-Garde Black/Death Metal (7) avant-garde metal (5) black metal (473) black/death metal (74) black/thrash (11) blackened death metal (75) blackened thrash metal (14) brutal death metal (127) crossover (7) crust (11) cybergrind (1) dark ambient (26) dark metal (7) Darkwave (2) death / thrash metal (27) death metal (245) death metal. technical death metal (1) death/black metal (19) death/doom metal (17) death/grind (6) deathcore (21) deathgrind (32) depressive black metal (3) djent (2) doom metal (71) drone metal (5) eclectic prog (1) electronic (3) experimental (20) extreme progressive metal (6) folk (4) folk metal (12) funeral doom metal (6) fusion (7) fusion rock (1) goregrind (64) gothic black metal (27) gothic metal (47) gothic/doom metal (20) grind (54) grindnroll (16) grindcore (96) groove metal (7) hard rock (5) hardcore (32) heavy metal (62) hyperblasting ...
TY - JOUR. T1 - Tryptophan Cu(I)-π interaction fine-tunes the metal binding properties of the bacterial metallochaperone CusF. AU - Loftin, Isabell R.. AU - Blackburn, Ninian J.. AU - McEvoy, Megan M.. N1 - Funding Information: Acknowledgments We acknowledge Steve Vanhoy for preparation of the CusF1-88-W44M plasmid construct. We thank Sue Roberts for assistance with crystallographic data collection and F. Ann Walker for helpful discussions. We thank Jared Barber for assistance with the MATLAB fitting program to determine the binding affinities. We gratefully acknowledge the use of facilities at the Stanford Synchrotron Radiation Laboratory, which is supported by the National Institutes of Health Biomedical Research Technology Program, Division of Research Resources, and by the US Department of Energy, Basic Energy Sciences (BES) and Office of Biological and Environmental Research (OBER). This work was supported by National Institutes of Health Grants GM54803 and PO1 GM067166 to N.J.B. and Grant ...
Before Its News). Metal can packaging refers to containers made from materials such as steel and aluminium that are used for the storage and distribution of goods such as food, beverages, oil, and chemicals. Such packaging is usually made out of materials such as steel and aluminium.. Consumers prefer metal cans compared to other traditional packaging materials because of benefits such as long shelf life, recyclability, UV resistance, excellent printability, and moisture and bacterial protection. It also has the ability to retain flavour.. The Food and Beverage Metal Can Market 2016-2020 report covers the present scenario and the growth prospects of the Food and Beverage Metal Can Market 2016-2020 for 2016-2020. To calculate the market size, the report considers both the direct revenue and the indirect revenue of the vendors.. The report provides a basic overview of the Food and Beverage Metal Can Market 2016-2020 including definitions, classifications, applications and market Sales chain ...
Metal toxicity or metal poisoning is the toxic effect of certain metals in certain forms and doses on life. Some metals are toxic when they form poisonous soluble compounds. Certain metals have no biological role, i.e. are not essential minerals, or are toxic when in a certain form. In the case of lead, any measurable amount may have negative health effects. Often heavy metals are thought as synonymous, but lighter metals may also be toxic in certain circumstances, such as beryllium and lithium. Not all heavy metals are particularly toxic, and some are essential, such as iron. The definition may also include trace elements when in abnormally high doses may be toxic. An option for treatment of metal poisoning may be chelation therapy, which is a technique which involves the administration of chelation agents to remove metals from the body. Toxic metals sometimes imitate the action of an essential element in the body, interfering with the metabolic process resulting in illness. Many metals, ...
KS3 Chemistry 9E Metals and Metal Compounds 1 of 20 32 В© Boardworks Ltd 2005 2004 Contents 9E Metals and Metal Compounds Metals and non-metals Metals and acids Metal compounds and acids Symbol equations Summary activities 1 2 of 20 32 В© Boardworks Ltd 2005 2004 Metal or non-metal? Is this element a metal or a non-metal ? Hard to say! H He Li Be B C N O F Ne iron (Fe) antimony (Sb) iodine (I) copper (Cu) phosphorus (P) sulfur (S)(Mg) magnesium Na Mg Al Si P S Cl Ar K Ca Sc Ti V Cr Mn Fe Co Ni Cu Zn Ga Ge As Se Br Kr Rb Sr Y Zr Nb Mo Tc Ru Rh Pd Ag Cd In Sn Sb Te I Xe Cs Ba La Hf Ta W Re Os Ir Pt Au Hg Tl Pb Bi Po At Rn Fr Ra Ac Rf Db Sg Bh Hs Mt ? ? ? 1 3 of 20 32 В© Boardworks Ltd 2005 2004 Metals and non-metals in the periodic table The periodic table is a list of all the known elements which are arranged according to the similarities in their properties. Non-metals are Metals are on the mostly on the right. left and in the centre. Xe What type of elements are between metals and ...
8-bit (4) abstract hip-hop (4) acid (3) acoustic (6) aggrotech (1) alternative metal (2) alternative rock (2) ambient (18) ambient black metal (5) animation (1) atmospheric black metal (7) atmospheric metal (2) avant-garde metal (1) beats (3) black acid (2) black metal (167) black n roll (14) blackened crust (11) blackened death metal (5) blackened doom metal (4) blackened folk metal (11) blackened sludge (5) blackened thrash metal (9) blacknened sludge (1) blues (4) breakbeat (3) breakcore (16) bree breee (2) brutal death metal (14) cello (1) chiptune (17) classic (1) classic rock (2) compilation (2) concept album (1) contemporary classical (2) cover (17) crossover (6) crust (15) crust punk (17) d-beat (2) dark ambient (10) dark folk (15) dark metal (3) death metal (73) death n roll (2) death-doom metal (7) death-thrash metal (5) deathcore (3) deathgrind (5) demo (5) depressive black metal (8) djent (1) doom metal (28) drone-doom metal (1) drum cover (3) drum n bass (4) drums (3) dub (12) ...
Heterogeneous metal catalysts rather than homogeneous ones are recommended for industrial applications after considering their performance in activity, separation, and recycling [1]. The recycling of metal catalysts is important from economic and environmental points of view. When supported and bulk metal catalysts are used in liquid-phase organic reactions, there is a possibility that active metal species are leaching away into the liquid phases [2,3]. The metal leaching would make it difficult for the catalysts to maintain their desired initial performance for repeated batch reactions and during continuous ones. The metal leaching would also cause some undesired contamination of products by the metal species dissolved in the reaction mixture, and the separation of the metal contaminants would be required to purify the products. Therefore, various novel methods have been proposed so far to immobilize/stabilize the active metal species and to separate/collect/reuse the dissolved metal species [4]. In
Published December 16 2013. Toxins can have a big impact on ones health, and while there are many different toxins out there, in this article Im going to focus on the toxic metals. Ill be using the terms toxic metals and heavy metals interchangeably throughout this article. Although any heavy metal can cause damage in excess (i.e. iron or copper), the focus of this article will be on those heavy metals which are toxic even in smaller amounts. There are numerous toxic metals, but Im mainly going to talk about mercury, cadmium, aluminum, lead, and arsenic. Not all of these toxic metals directly affect thyroid health, but this of course doesnt mean they wont have a negative impact on ones overall health.. Just as is the case with other toxins, nobody is going to be able to completely eliminate all of the toxic metals from their body. Just about everyone has mercury, cadmium, arsenic, and other metals stored in their tissues. Some people have small amounts of these toxins, while other ...
Yoshida, T., Tanabe, T., Okabe, Y., Sawasaki, T. and Chen, A. Decomposition of Carbon Dioxide by Metals during Gamma Irradiation. Radiat. Res. 164, 332-335 (2005).. We have proposed a technique to enhance the decomposition of carbon dioxide by γ irradiation. This is possible by putting metal components into CO2 gas to promote the conversion of γ rays to lower-energy electrons through Compton, photoelectron and cascading electron knock-on events in metals. Numerical simulations using the EGS code indicated that the number of lower-energy electrons ejected from metals into CO2 gas increases with increasing Z number and/or density of the metals; this was supported by the experimental results, i.e., the CO2-containing metals with a higher Z number exhibited a greater efficiency for production of CO. In addition, production of CO could be enhanced by carefully controlling the volume and surface area of metal components as well as the proximity to adjacent metal components. These experimental ...
El nu metal (de vegades també anomenat aggro metal o nü metal) és un subgènere musical sorgit a mitjans dels anys 90 i influenciat sobretot per estils com el grunge, el metal alternatiu, el funk, el rap i alguns subgèneres del heavy metal, com el thrash metal i el groove metal. La música nu metal engloba latmosfera el ritme i la Textura musical per sobre de la melodia i la complexa instrumentació. Moltes vegades, les cançons de nu metal utilitzen riffs rítmics i sincopats, tocats amb distorsionades guitarres elèctriques afinades en rangs baixos per a crear una música més fosca que la tradicional. Les bandes que van donar origen al gènere nu metal van ser Korn (amb el seu àlbum homònim lany 1994) i els Deftones amb el seu disc del 1995, . Es diu nu metal, perquè ve de new metal (nou metal) per voler presentar una barreja de diversos gèneres ja esmentats al principi de larticle. En certes parts es denomina aggro metal al nu metal més agressiu (cridat) i menys rapejat (Korn, ...
A method for improving the electrical conductivity of a substrate of metal, metal alloy or metal oxide comprising depositing a small or minor amount of metal or metals from Group VIIIA metals (Fe, Ru, Os, Co, Rh, Ir, Ni, Pd, Pt) or from Group IA metals (Cu, Ag, Au) on a substrate of metal, metal alloys and/or metal oxide from Group IVA metals (Ti, Zr, Hf), Group VA metals (V, Nb, Ta), Group VIA metals (Cr, Mo, W) and Al, Mn, Ni and Cu. The native oxide layer of the substrate is changed from electrically insulating to electrically conductive. The step of depositing is carried out by a low temperature arc vapor deposition process. The deposition may be performed on either treated or untreated substrate. The substrate with native oxide layer made electrically conductive is useable in the manufacture of electrodes for devices such as capacitors and batteries.
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VII. Total Energetic Requirements to Induce the Glass Transition via Consideration of the First-Shell Coordination Sphere in Transition Metal and Lanthanide Complexes. VIII. Summary. IX. Acknowledgments. X. References. 2. Metal Oxide Clusters as Building Blocks for Inorganic-Organic Hybrid Polymers (Ulrich Schubert). I. Introduction. II. Synthesis of Organically Modified Transition Metal Oxide Clusters. III. Synthesis and Structural Characterization of the Cluster-Reinforced Polymers. IV. Properties of the Cluster-Based Hybrid Polymers. V. Summary. VI. Acknowledgments. VII. References. 3. Metal-Containing Polydyes (Charles E. Carraher). I. Introduction. II. Group IVB-Containing Polydyes. III. Ruthenium-Containing Polydyes. IV. Hematoporphyrin-Containing Polydyes. V. Summary/VI. References. 4. Metallopolymer Nanocomposite-Macromulecular Metallocomplexes as Precursors for Polymers, Polymer Inorganics, and Bionanocomposites (A. D. Po,ogailo). I. Introduction. II. General Characteristics, ...
The invention is directed to a particular class of metal complexes, specifically certain texaphyrin metal complexes, which both hydrolyze and photocleave RNA, and which also both hydrolyze RNA and photocleave DNA. In one embodiment, the present invention is directed to a method for both hydrolyzing and photocleaving a polymer of ribonucleic acid, the method comprising the steps of contacting the polymer of ribonucleic acid with a texaphyrin metal complex exhibiting catalytic activity for both hydrolysis and photocleavage of ribonucleic acid polymers, incubating the polymer and the metal complex under conditions and for a time sufficient to hydrolyze the phosphate ester bond of the polymer, and exposing the texaphyrin metal complex to light for a time sufficient to photocleave the polymer. In another embodiment of the present invention, the invention is directed to a method for both hydrolyzing a polymer of ribonucleic acid and photocleaving a polymer of deoxyribonucleic acid, the method comprising the
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A method for manufacturing light emitting diode includes steps of: providing a base which has a first metal layer and a second metal layer on two opposite sides thereof, respectively; providing grooves which penetrate the first metal layer and the base and expose the second metal layer; forming a conducting layer which extends between the two opposite sides of the base and is electrically isolated from the second metal layer exposed in the grooves; fixing light emitting chips in the grooves to make the light emitting chips be in heat-conductive connection with the second metal layer; connecting the light emitting chips electrically to the second metal layer and the conducting layer; and forming an encapsulation layer which covers the light emitting chips. The manufacturing method can improve the heat dissipation efficiency of the light emitting diode and reduce the manufacturing cost.
The invention generally relates to systems and methods for producing metal clusters; functionalized surfaces; and droplets including solvated metal ions. In certain aspects, the invention provides methods that involve providing a metal and a solvent. The methods additionally involve applying voltage to the solvated metal to thereby produce solvent droplets including ions of the metal containing compound, and directing the solvent droplets including the metal ions to a target. In certain embodiments, once at the target, the metal ions can react directly or catalyze reactions.
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Press release - Up Market Research (UMR) - Automotive Sheet Metal Components Market 2019 | Global Forecast 2025 | Top Key Players ? Novelis, Aleris International, Mayville Engineering Company - published on openPR.com
Metal ions play key roles in biology. Many are essential for catalysis, for electron transfer and for the fixation, sensing, and metabolism of gases. Others compete with those essential metal ions or have toxic or pharmacological effects.This book is structured around the periodic table and focuses on the control of metal ions in cells. It addresses the molecular aspects of binding, transport and storage that ensure balanced levels of the essential elements. Organisms have also developed mechanisms to deal with the non-essential metal ions. However, through new uses and manufacturing processes, organisms are increasingly exposed to changing levels of both essential and non-essential ions in new chemical forms. They may not have developed defenses against some of these forms (such as nanoparticles).Many diseases such as cancer, diabetes and neurodegeneration are associated with metal ion imbalance. There may be a deficiency of the essential metals, overload of either essential or non-essential metals or
An ancient religion set up by Metalheads/Moshers/Rockers/Goths that has very fine layers that must be respected, can als be called the Sisterhood of Metal for female members, the layers/ranks are as follows: Air Guitarist Preacher of Metal Priest of Metal Psyker of Metal Metal Seer Council Member Prophet of Metal Representitive of Seers God of Metal The Brotherhood of Metal also has it's own army, that being Soldier of Metal Chavhunter Commander Judge of Metal (Not to be confused as a person who decides what Metal bands are good/bad, but a person who can issue a Mosh Pit Death sentence to a Chav scumbag
Molecular Biology and Toxicology of Metals provides a critical review and analysis of the current state of knowledge of metal ion transport and metabolism in prokaryotic and eukaryotic cellular systems. It covers the latest information on specific metals and the biological molecules with which metals interact. It also details mechanisms in the handling and toxicity of metals in specific organ systems, and the role of metals in cell signalling and gene transcription in target cells. This book is sure to prove a fertile meeting ground for the disciplines of molecular genetics and metal toxicology.
Molecular Biology and Toxicology of Metals provides a critical review and analysis of the current state of knowledge of metal ion transport and metabolism in prokaryotic and eukaryotic cellular systems. It covers the latest information on specific metals and the biological molecules with which metals interact. It also details mechanisms in the handling and toxicity of metals in specific organ systems, and the role of metals in cell signalling and gene transcription in target cells. This book is sure to prove a fertile meeting ground for the disciplines of molecular genetics and metal toxicology.
There is no metallurgical standard for pot metal. Common metals in pot metal include zinc, lead, copper, tin, magnesium, aluminium, iron, and cadmium. The primary advantage of pot metal is that it is quick and easy to cast. Because of its low melting temperature, it requires no sophisticated foundry equipment or specialized molds. Manufacturers sometimes use it to experiment with molds and ideas (e.g., prototypes) before casting final products in a higher quality alloy. Depending on the exact metals thrown into the pot, pot metal can become unstable over time, as it has a tendency to bend, distort, crack, shatter, and pit with age. The low boiling point of zinc and fast cooling of newly cast parts often trap air bubbles within the cast part, weakening it. Many components common in pot metal are susceptible to corrosion from airborne acids and other contaminants, and internal corrosion of the metal often causes decorative plating to flake off.[citation needed] Pot metal is not easily glued, ...
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TY - JOUR. T1 - Biomineralization, bioremediation and biorecovery of toxic metals and radionuclides. AU - Gadd, Geoffrey Michael. AU - Pan, Xiangliang. PY - 2016/3/15. Y1 - 2016/3/15. N2 - Metal and mineral transformations are a cornerstone of geomicrobiological processes. Of central importance are the mechanisms by which microorganisms alter the speciation and mobility of metals, including their properties of mineral dissolution or mineral formation. Such processes underpin natural biogeochemical cycles for metals, and related elements such as metalloids, and metal radionuclides, as well as those elements that may be commonly associated with metal compounds and minerals, e.g., P and S. They may also determine the fate of contaminant toxic metals and radionuclides when introduced or redistributed in the environment as a result of natural or anthropogenic activities. Such contamination is an increasing problem, and microbe-based systems are increasingly viewed as potentially useful approaches for ...
Access Report Details @ https://www.marketresearchfuture.com/reports/metal-cans-market. Market Research Analysis:. The market is highly application based. Food & beverage globally drive the market due to rising disposable income and changing lifestyles. The market is expected to have higher growth rate as compared to the previous years. On the basis of material, Aluminum accounted for the largest market share. Asian countries, especially India, China and Japan expected to grow fast over the forecasted period due to large population base, increasing demand for processed food & beverages and the growing consumer market. However, North-America is the largest region for the metal cans market and is expected to grow at a steady rate.. Scope of the Report:. This study provides an overview of the global metal cans market, tracking three market segments across four geographic regions. The report studies key players, providing a five-year annual trend analysis that highlights market size, volume and ...
We here at Metal Storm pride ourselves on our thousands of metal reviews and interviews and article; metal is our collective soul and passion, which is why we bother with this junk. That being said, wed be lying if we stuck to our trve-kvlt guns and claimed that metal is the only thing we ever listen to. Whether we want to admit it or not, we do check out some other stuff from time to time; some of us are more poptimistic than others, but theres a whole world out there aside from Satan-worshiping black metal and dragon-slaying power metal. We do already feature some nonmetal artists on our website and have a few reviews to back them up, but we prefer to limit that aspect of the site to those artists who have been a strong influence on the metal scene or who are in some way connected to it. This article series is the place for those artists who dont matter to metal in the slightest but still warrant some conversation - after all, good music, is good music, and we all know metal isnt the only ...
1. Initially the number of times an element occurs on both sides of the skeleton equation should be counted.. 2. An element which occurs least number of times in reactant and product side must be balanced first. Then, elements occuring two times, elements occuring three times and so on in an increasing order must be balanced.. 3. When two or more elements occur same number of times, the metallic element is balanced first in preference to non - metallic element. If more than one metal or nonmetal is present then a metal or non-metal with higher atomic mass (refer periodic table to find the atomic mass) is balanced first.. 4. The number of molecules of reactants and products are written as coefficient.. 5. The formula should not be changed to make the elements equal.. 6. Fractional method of balancing must be employed only for molecule of an element (O2, H2,O3, P4,…) not for compound (H2O, NH3,…).. Question 6 ...
The paper from the British edition of the Journal of Bone and Joint Surgery gives some details comparing metal on ceramic and metal on metal bearings: A...
Metals such as mercury, arsenic, copper and silver have been used in various forms as antimicrobials for thousands of years with until recently, little understanding of their mode of action. The discovery of antibiotics and new organic antimicrobial compounds during the twentieth century saw a general decline in the clinical use of antimicrobial metal compounds, with the exception of the rediscovery of the use of silver for burns treatments and niche uses for other metal compounds. Antibiotics and new antimicrobials were regarded as being safer for the patient and more effective than the metal-based compounds they supplanted. Bacterial metal ion resistances were first discovered in the second half of the twentieth century. The detailed mechanisms of resistance have now been characterized in a wide range of bacteria. As the use of antimicrobial metals is limited, it is legitimate to ask: are antimicrobial metal resistances in pathogenic and commensal bacteria important now? This review details ...
Investment Grade Molybdenum. Commodities are physical substances like grains, food and metals. An investment is the purchase of a financial product or other item of value with the expectation of favorable returns in the future.. Well, I prefer metals for preservation of my wealth. The question is what metal would you pick to preserve your wealth? Now the next thing to keep in mind is not to be biased in any way. That is, to buy a certain metal because someone tells you to, or to buy a certain metal because it is on an upward price trend or buy a metal because you read an interesting article on it.. #1 on my shopping list. I look at is a the ability of a metal to actually promote or enable life of plants and animals on this planet. This means that you can actually grow food with it or grow trees. You can actually use the metal by sprinkling the powderized form on your soil and let the microbes in the soil slowly break down the metal and make it available for the plants to consume. Hydroponic or ...
Metal surface at the quantum level. This depiction of a metal surface is obtained by applying the Helium-3 spin-echo technique. This technique requires firing a beam of polarised 3He atoms towards the surface of the metal so that the energy changes during scattering can be measured. Here, the metal can be seen as a lattice of positive metal ions (blue) in a sea of electrons (red). Th spin-echo technique can record measurements on the sub-nanometre and nanosecond scales, and the results built up digitally to reveal a three-dimensional image of the surface. - Stock Image A150/0480
Metal compilations have been pumped out in extraordinary numbers since around 1980, but few are worth paying for and listening to regularly. K-Tel put out a comp of mainstream metal called Masters of Metal, a pointless collection of stuff you could find at any Kmart store: KISS, Scorpions, Y&T. This comp was absolutely everywhere, and similar cash-grabs followed: among the slew were New Metal Monsters (Mr. Big, Enuff Znuff) and Metal Masters (Pat Travers is a metal master?).. Independents like Metal Blade did something similar, with more useful results: the three-part Best of Metal Blade series was a necessary buying guide, helpful in sorting through the masses of releases coming out at the time (and it helped you stay away from junk like Krank). The release of compilation series continued into the 90s and 2000s, some worthwhile, others not at all. And then theres Nuclear Blasts all-ballads Metal Dreams series. Dont get me started on that one.. Due to the amount of junky comps, ...
According to the new EU Medical Devices (MDR) legislation coming into effect in 2017, manufactures will have to comply with higher standards of quality and safety for medical devices in order to meet common safety concerns regarding such products. Metal alloys are extensively used in dentistry and medicine (e.g. orthopedic surgery and cardiology) even though clinical experience suggests that many metals are sensitizers. The aim of this study was to further test the applicability domain of the in vitro reconstructed human epidermis (RhE) IL-18 assay developed to identify contact allergens and in doing so: i) determine whether different metal salts, representing leachables from metal alloys used in medical devices, could be correctly labelled and classified; and ii) assess the ability of different salts for the same metal to penetrate the skin stratum corneum. Twenty eight chemicals including 15 metal salts were topically exposed to RhE. Nickel, chrome, gold, palladium were each tested in two ...
A powdered metal assembly includes a mechanical part, a powdered metal part and a fastener configured to join the mechanical part and the powdered metal part. In another aspect of the disclosure, a method for manufacturing a powdered metal assembly may include the steps of positioning the mechanical part in a forming apparatus, providing a powdered metal into the forming apparatus, compressing the powdered metal to form and bond a powdered metal part to the mechanical part to form the powdered metal assembly, and removing the powdered metal assembly from the forming apparatus. For facilities melting more than one of the metals listed in Table 1, eligibility for exemption shall be determined using the following calculation:. For each metal listed in Table 1, divide the quantity melted by the specific exemption limit listed.. Sum the resulting fractions for all the metals.. If the sum does not exceed 1.0, the facility qualifies for the exemption under subsection 4.1.. 4.2 Metal or Alloy Purity Exemption. Facilities or furnaces which do not melt scrap except clean aluminum scrap and which melt a metal or alloy (other than the metals listed in Table 1) which is shown by the facility operator to have a content of no more than 0.004% of cadmium and no more than 0.002% of arsenic are exempt from subsections 5.1, 5.2, & 5.3. A facility granted an exemption under subsection 4.1.2 may also be granted exemption for all metals that meet the purity limits in this subsection.. 4.3 Clean Aluminum Scrap Exemption. Furnaces used exclusively to process clean aluminum scrap or a ...
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(PRWEB) November 09, 2012 -- The US Drug Watchdog is calling the US metal on metal hip implant fiasco the largest medical device failure in US history
Metal Organic Frameworks (MOFs) are a class of porous material, in which metal nodes are connected using organic linkers. The properties of MOFs are highly tunable due to the combination of nodes and linkers available. Additionally, individual metal atoms on the nodes can be exchanged and exposed to create tailored open metal sites, thus resulting in a well-defined binding site immobilized on a support with controllable pore size. In this work, we investigate the reactivity of this site in a combination of density functional theory (DFT) calculations and experimental validation, focusing on the adsorption energy of gases in metal-exchanged MOFs. Here, we focus on the application of open metal sites in MOFs in the separation of ethane/ethylene and propane/propylene via selective adsorption of alkenes over alkanes.. We have calculated the binding energies for a variety of adsorbates (C2H4, C2H6, C3H6, C3H8, CO2, CH4, H2, N2, CO) in order to model the reactivity of the open metal site. Since DFT ...
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PURPOSE & DESIGN:. The investigators are currently following up a cohort of patients all of whom have had a metal on ceramic total hip arthroplasty.. This new bearing couple has been approved for use in the UK for some time and has recently achieved USA FDA approval.. The attraction of this bearing couple is a low rate of wear with reduced complications associated with ceramic on ceramic bearing such as bearing fracture.. Of recent media attention has been the unacceptably high failure of the DePuy ASR metal on metal hip resurfacing. This metal on metal bearing couple has been associated with increased ion levels and chromosome abnormalities in vivo.. In vitro studies and small in vivo studies have revealed much lower wear, particle numbers and ion levels in ceramic on metal studies than in metal on metal bearing surfaces; however there is no large scale evidence that this is the case.. The investigators currently are following up the largest worldwide series of ceramic on metal bearings and ...
A method for treating wood, characterized by impregnating wood with a metal-containing treating agent containing lignin and/or lignin derivatives and a metal, a metal compound, and/or a metal ion and oxidizing and/or macromolecularizing of the lignin and/or lignin derivatives in the wood to fix the metal component in the wood, and wood and woody materials obtained by the treating method. According to the method of the present invention, while effectively utilizing lignins, lignosulfonic acids, or lignosulfonic acid salts, leaching of the metal component can be suppressed to a low level to thereby retain the effects due to the incorporation of the metal components for a prolonged period.
The PM-bound metallic elements in 43 daily PM1 samples collected at Mount Tai during a summer campaign were analyzed by ICP-MS. The PM1 concentrations ranged between 11.02 and 83.71 µg m-3, with an average of 38.98 µg m-3, and were influenced by meteorological events, exhibiting an increasing trend in the early stage of rain, followed by a significant decrease denoting efficient scavenging. Higher elemental concentrations were detected at Mount Tai than at other overseas background sites. According to the enrichment factor (EF) and geo-accumulation index (Igeo) calculations, among the 16 considered elements, Mn, Al, Co, Sr, Mo, Fe, Ca, V, Ti and Ni in the PM1 were mainly of crustal origin, while Cu, Cr, As, Zn, Pb and Cd were primarily due to anthropogenic causes. Source identification via Pearson correlation analysis and principle component analysis showed that coal mining and coal burning activities, metal processing industries and vehicle emissions were common sources of heavy metals on Mount Tai;
TY - JOUR. T1 - Novel use of fully covered self-expandable metal stent for drainage of perirectal abscess. A case series. AU - Lee, Mindy. AU - Izzy, Manhal. AU - Ho, Sammy. PY - 2017/6/1. Y1 - 2017/6/1. KW - Appendicular abscess. KW - Endoscopic drainage. KW - Endoscopic ultrasound. KW - Perirectal abscess. UR - http://www.scopus.com/inward/record.url?scp=85020839356&partnerID=8YFLogxK. UR - http://www.scopus.com/inward/citedby.url?scp=85020839356&partnerID=8YFLogxK. U2 - 10.1016/j.ajg.2017.05.017. DO - 10.1016/j.ajg.2017.05.017. M3 - Article. C2 - 28624158. AN - SCOPUS:85020839356. VL - 18. SP - 122. EP - 125. JO - Arab Journal of Gastroenterology. JF - Arab Journal of Gastroenterology. SN - 1687-1979. IS - 2. ER - ...
A heart pacemaker system has an electrode line with a proximal end which is introduced into a connector of the pacemaker housing, and a distal end having an electrode head attachable to the heart of a user. One or more of the distal or proximal ends of the electrode line, the connector, or a region of the electrode line are provided with a component consisting of shape-memory metal. These components have a first shape at temperatures different from body temperature, and assume a second shape when at body temperature. The shape-memory metal component, if disposed at the proximal end of the electrode line or at the connector, is arrnaged to provide a firm mechanical and electrical connection of the electrode line with the pacemaker housing upon the change of shape of the component. The shape-memory metal component, if disposed at the distal end, is arranged to assist in providing, either directly or indirectly, a reliable, mechanical and electrical connection of the electrode line to the heart upon the
TY - JOUR. T1 - The effect of phosphate accumulation on metal ion homeostasis in Saccharomyces cerevisiae. AU - Rosenfeld, Leah. AU - Reddi, Amit R.. AU - Leung, Edison. AU - Aranda, Kimberly. AU - Jensen, Laran T.. AU - Culotta, Valeria C.. PY - 2010/9/1. Y1 - 2010/9/1. N2 - Much of what is currently understood about the cell biology of metals involves their interactions with proteins. By comparison, little is known about interactions of metals with intracellular inorganic compounds such as phosphate. Here we examined the role of phosphate in metal metabolism in vivo by genetically perturbing the phosphate content of Saccharomyces cerevisiae cells. Yeast pho80 mutants cannot sense phosphate and have lost control of phosphate uptake, storage, and metabolism. We report here that pho80 mutants specifically elevate cytosolic and nonvacuolar levels of phosphate and this in turn causes a wide range of metal homeostasis defects. Intracellular levels of the hard-metal cations sodium and calcium ...
The effect of different metal ions on the intestinal transport and the antibacterial activity of cefadroxil [(6R,7R)-7-{[(2R)-2-amino-2-(4-hydroxyphenyl)acetyl]amino}-3-methyl-8-oxo-5-thia-1-azabicyclo[4.2.0]oct-2-ene-2-carboxylic acid] was investigated. The [14C]Gly-Sar uptake via PEPT1 was inhibited by Zn2+ and Cu2+ treatment in a concentration-dependent manner (Ki values 107 ± 23 and 19 ± 5 μM, respectively). Kinetic analysis showed that the Kt of Gly-Sar uptake was increased 2-fold in the presence of zinc sulphate (150 μM) whereas the Vmax value were not affected suggesting that zinc ions inhibited Gly-Sar uptake by PEPT1 in a competitively manner. Ni2+ exhibited moderate inhibitory effect, whereas Co2+, Mg2+, Al3+ ions showed no inhibitory effect on Gly-Sar uptake via PEPT1. Subsequently, we examined the effect of Zn2+ and Al3+ ions on the transepithelial transport of cefadroxil across Caco-2 cells cultured on permeable supports. The results showed that zinc ions inhibited the transepithelial
PURPOSE: To evaluate two commercial CT metal artifact reduction (MAR) algorithms for use in proton treatment planning in the head and neck (H&N) area.. METHODS: An anthropomorphic head phantom with removable metallic implants (dental fillings or neck implant) was CT-scanned to evaluate the O-MAR (Philips) and the iMAR (Siemens) algorithms. Reference images were acquired without any metallic implants in place. Water equivalent thickness (WET) was calculated for different path directions and compared between image sets. Images were also evaluated for use in proton treatment planning for parotid, tonsil, tongue base, and neck node targets. The beams were arranged so as to not traverse any metal prior to the target, enabling evaluation of the impact on dose calculation accuracy from artifacts surrounding the metal volume. Plans were compared based on γ analysis (1 mm distance-to-agreement/1% difference in local dose) and dose volume histogram metrics for targets and organs at risk (OARs). Visual ...
PURPOSE: To evaluate two commercial CT metal artifact reduction (MAR) algorithms for use in proton treatment planning in the head and neck (H&N) area.. METHODS: An anthropomorphic head phantom with removable metallic implants (dental fillings or neck implant) was CT-scanned to evaluate the O-MAR (Philips) and the iMAR (Siemens) algorithms. Reference images were acquired without any metallic implants in place. Water equivalent thickness (WET) was calculated for different path directions and compared between image sets. Images were also evaluated for use in proton treatment planning for parotid, tonsil, tongue base, and neck node targets. The beams were arranged so as to not traverse any metal prior to the target, enabling evaluation of the impact on dose calculation accuracy from artifacts surrounding the metal volume. Plans were compared based on γ analysis (1 mm distance-to-agreement/1% difference in local dose) and dose volume histogram metrics for targets and organs at risk (OARs). Visual ...
The purpose of this study was to develop, implement and evaluate a dedicated metal artefact reduction (MAR) method for flat-detector CT (FDCT). The algorithm uses the multidimensional raw data space to calculate surrogate attenuation values for the original metal traces in the raw data domain. The metal traces are detected automatically by a three-dimensional, threshold-based segmentation algorithm in an initial reconstructed image volume, based on twofold histogram information for calculating appropriate metal thresholds. These thresholds are combined with constrained morphological operations in the projection domain. A subsequent reconstruction of the modified raw data yields an artefact-reduced image volume that is further processed by a combining procedure that reinserts the missing metal information. For image quality assessment, measurements on semi- anthropomorphic phantoms containing metallic inserts were evaluated in terms of CT value accuracy, image noise and spatial resolution before ...
The present disclosure provides a process for selectively separating a first heavy metal such as copper from a liquid medium containing at least the first heavy metal in dissolved form, by: (a) contacting the liquid medium with a solid sulfide of a second heavy metal such as zinc, said sulfide of the second heavy metal having a solubility which is higher than the solubility of the sulfide of the first heavy metal, in a first reactor, to produce a precipitate of a sulfide of the first heavy metal and a solution containing second heavy metal; (b) separating the precipitate of the first heavy metal sulfide from the solution containing the second heavy metal; (c) contacting the solution of the second heavy metal with a source of sulfide produced by biological conversion of a sulfur compound, in a second reactor, to produce a precipitate of a sulfide of the second heavy metal and a treated solution; and (d) returning at least part of the precipitate of the sulfide of the second heavy metal to step (a). The
The Immunology Devices Panel of the Medical Devices Advisory Committee recently met to provide advice and recommendations to the FDA about immunological responses to metal-containing products regulated as medical devices, including metal-containing implants and dental amalgam.“Overall, the panel feels that successful outcomes of procedures where devices are implanted in the body are
Our quantitative results differ considerably from those of Posewitz and Tempst (35), especially for the recovery of phosphopeptides from Fe3+-IDA with aqueous ammonia. We think that the difference is mainly due to the different aims in phosphopeptide capture MALDI compatibility (35) versus preparative-scale isolation in our study. We have eluted the peptides with a larger volume of dilute ammonia to achieve a sufficiently high pH in the column, and left the column for at least 5 min in these alkaline conditions (see Materials and Methods). Posewitz and Tempst note that with their eluting conditions, the eluate was mildly alkaline, suggesting that their Fe3+-IMAC columns may not have reached the original pH of the eluant. They further note that more than 10 volumes of the elution solvent, or significantly lower flow rate, was required to even begin desorbing the phosphorylated peptides. Our conditions are closer to this description. The recovery of 60-70% of the input is lower than ...
Bare metal stents: Bare metal stents (BMS) are thin spring like structures used to scaffold a blood vessel after angioplasty (removal of blocks). Bare metal stents are made of stainless steel, nitinol or cobalt-chromium.. ...
Cobalt-chromium alloy (Co-Cr) particles in the nanometre size range are produced by wear at the articulating surfaces of metal-on-metal implants, and are associated with inflammation, bone loss and implant loosening. Additionally, metal implants undergo corrosion inside the human body releasing ions into the surrounding tissue. This led to the withdrawal from the market of the DePuy ASR™ metal-on-metal hip replacements in 2010. Ions released from Co-Cr particles derived from a resurfacing implant and their subsequent cellular up-take have been measured. Moreover, the ability of the metal debris and Cobalt (Co) ions to induce apoptosis was examined. For this purpose, U937 cells and Co pre-treated U937 cells were exposed to Co, metal debris and Co + debris for 24 and 48 h. To measure metal ion concentrations in culture medium and cell lysates Inductively Coupled Plasma Mass Spectrometry (ICP-MS) analysis was performed. Apoptosis was evaluated with Fluorescence-Activated Cell Sorting (FACS) and ...
3-Dialkylaminomethyl substituted salicylaldoximes are efficient metal salt extractants, and, in contrast to related ``salen-based reagents, are sufficiently stable to acid hydrolysis to allow commercial application in base metal recovery. Crystal structures show that metal salts are bound by a zwitterionic form of the reagents, with copper(II) nitrate, tetrafluoroborate and trifluoroacetate forming [Cu(L)(2)X(2)] assemblies in a tritopic arrangement with a trans-disposition of the anions outwith the coordination sphere. Copper(II) chloride, bromide and zinc(II) chloride form 1:1 assemblies, [Cu(L)X(2)], with the halides in the inner coordination sphere of the metal, leading to high chloride selectivity and very good mass transport efficiencies of CuCl(2). Introduction of the anion-binding sites into the salicylaldoxime extractants changes their cation selectivities; the ligands co-extract small amounts of Fe(III) along with Cu(II) from mixed metal aqueous feed solutions, an issue which will ...
Title: Toxic Metals and Oxidative Stress Part I: Mechanisms Involved in Me-tal induced Oxidative Damage. VOLUME: 1 ISSUE: 6. Author(s): Nuran Ercal, Hande Gurer-Orhan and Nukhet Aykin-Burns. Affiliation:Department of Chemistry,University of Missouri-Rolla, 142 Schrenk Hall, Rolla, MO 65409-0010,USA.. Abstract: Toxic metals (lead, cadmium, mercury and arsenic) are widely found in our environment. Humans are exposed to these metals from numerous sources, including contaminated air, water, soil and food. Recent studies indicate that transition metals act as catalysts in the oxidative reactions of biological macromolecules therefore the toxicities associated with these metals might be due to oxidative tissue damage. Redox-active metals, such as iron, copper and chromium, undergo redox cycling whereas redox-inactive metals, such as lead, cadmium, mercury and others deplete cells major antioxidants, particularly thiol-containing antioxidants and enzymes. Either redox-active or redox-inactive metals ...
Adverse Reaction to Metal Debris (ARMD) is still a major reason for revision surgeries in patients with metal-on-metal (MoM) hip replacements. ARMD consists of a wide range of alterations in periprosthetic tissues, most important of which are metallosis, inflammation, pseudotumors and necrosis. Studies investigating histopathological findings and their association to implant wear or indirect measures of wear have yielded inconsistent results. Therefore, we aimed to investigate bearing surface wear volume, whole blood and synovial fluid metal ion concentrations, histopathological findings in periprosthetic tissues and their associations. Seventy-eight patients with 85 hips revised for ARMD were included in the study. Prior to revision surgery, all patients had whole blood chromium and cobalt ion levels assessed. In revision surgery, a synovial fluid sample was taken and analyzed for chromium and cobalt. Periprosthetic tissue samples were taken and analyzed for histopathological findings. Explanted
Heavy metal (ofte bare metal, fornorsket tungmetall eller tungrock) er en sjanger innen rockemusikken. Begrepet oppstod sent på 1960- og begynnelsen av 1970-tallet, men har siden endret betydning. Sjangeren kjennetegnes ofte av sterkt forsterkede og forvrengte gitarer, og drivende og tunge rytmer. Lydbildet kan ofte beskrives som «aggressivt», «mørkt» og/eller «dystert». Da heavy metal begynte som populærmusikalsk stil, fantes det ikke like mange begreper som vi har i dag. Heavy metal og hardrock betydde mer eller mindre det samme, men etter hvert som årene gikk ble det utviklet nye undersjangere (speed metal, thrash metal, power metal og så videre) i tillegg til at de «nye hardrock-bandene» begynte ofte å bruke helt nye effekter. De nye bandene var ofte dystrere, tyngre og benyttet seg av helt nye spillestiler. Skillet mellom hardrock og metal går hovedsakelig på at metal er «hardere» enn hardrock, som befinner seg mellom den tradisjonelle rocken og heavy metal. I dag[når?] ...
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In coordination chemistry, a structure is first described by its coordination number, the number of ligands attached to the metal (more specifically, the number of donor atoms). Usually one can count the ligands attached, but sometimes even the counting can become ambiguous. Coordination numbers are normally between two and nine, but large numbers of ligands are not uncommon for the lanthanides and actinides. The number of bonds depends on the size, charge, and electron configuration of the metal ion and the ligands. Metal ions may have more than one coordination number. Typically the chemistry of transition metal complexes is dominated by interactions between s and p molecular orbitals of the donor-atoms in the ligands and the d orbitals of the metal ions. The s, p, and d orbitals of the metal can accommodate 18 electrons (see 18-Electron rule). The maximum coordination number for a certain metal is thus related to the electronic configuration of the metal ion (to be more specific, the number ...
A process and an apparatus for preparing spherical submicronic, mono-dispersed and non-agglomerated particles of metal oxides by reacting with steam a gaseous stream containing an aerosol of liquid particles of a hydrolyzable metal compound. The process is characterized in that into a duct (1), in which an inert gas stream containing vapour of a hydrolyzable metal compound flows, there is fed, through a nozzle (2), a cold inert gas stream, the temperatures and flows of the two gaseous stream being such as to establish in the duct a temperature lower than the condensation temperature of the metal compound; the mixed gaseous streams have a turbulent flow in the duct, with a Reynolds number equal to or higher than 1800; at the duct outlet, the aerosol of the metal compound liquid particles, which has formed in the duct, is reacted with steam, whereby there form solid particles of hydrated metal oxide, which are then calcined to oxide.
ObjectiveThe objective of this study was to assess the accuracy of the quantitative measurements obtained using dual-energy computed tomography with metal artifact reduction software (MARS).MethodsDual-energy computed tomography scans (fast kV-switching) are performed on a phantom, by varying the nu
AbstractBackgroundPlacement of covered self-expandable metallic stent (CSEMS) for post-endoscopic sphincterotomy (ES) bleeding achieves excellent hemostasis results. Although CSEMS placement is typically performed after failure of conventional endoscopic combination therapy, its excellent outcomes may justify earlier placement.AimsWe aimed to examine the efficacy of
Health, ... Orthopedic surgeons are wary of metal on metal hip replacement surg...(PRWEB) March 17 2010 -- According to a recent story in the a href ...,New,York,Personal,Injury,Attorney,David,Perecman,Comments,On,Dangers,Of,‘Metal,On,Metal',Hip,Implants,medicine,medical news today,latest medical news,medical newsletters,current medical news,latest medicine news
The purpose of this study is to monitor the performance and compare the metal ion release of two bearing combinations, ceramic-on-metal and metal-on-metal in the treatment of patients with hip joint disease requiring a total hip replacement. Patients who enter the study will be randomly allocated to one of the bearing combinations and will be evaluated at regular intervals using, patient, clinical and x-ray assessments. Patients will also have blood samples taken at regular intervals to allow the metal ion levels to be determined ...
Bioinorganic Chemistry and Applications is a peer-reviewed, Open Access journal that publishes original research in the form of articles, notes, letters and reviews in the general field of bioinorganic chemistry and its applications. Its scope includes all aspects of bioinorganic chemistry, including bioorganometallic chemistry and applied bioinorganic chemistry. The journal welcomes papers relating to metalloenzymes and model compounds, metal-based drugs, biomaterials, biocatalysis and bioelectronics, metals in biology and medicine, metals toxicology and metals in the environment, metal interactions with biomolecules and spectroscopic applications.
This list of melodic death metal bands includes notable bands known for this music, a subgenre of death metal which combines the melody of the New Wave of British Heavy Metal (NWOBHM) with the intensity of death metal. The genre is additionally known as melodeath as well as Gothenburg metal, a reference to the city in Sweden where it originated. Originally the genre combined the harmony style and groove melodies of heavy metal with the harsh thrashing sound and vocals of death metal. Later the genre evolved due to many different influences, a notable evolution in the genre being the addition of keyboards. Melodic death metal contains more melodic guitar riffs, melodic solos, and acoustic guitar work than death metal.[citation needed]. ...
A hard mask is formed on an interconnect structure comprising a low-k material layer and a metal feature embedded therein. A block polymer is applied to the hard mask layer, self-assembled, and patterned to form a polymeric matrix of a polymeric block component and containing cylindrical holes. The hard mask and the low-k material layer therebelow are etched to form cavities. A conductive material is plated on exposed metallic surfaces including portions of top surfaces of the metal feature to form metal pads. Metal silicide pads are formed by exposure of the metal pads to a silicon containing gas. An etch is performed to enlarge and merge the cavities in the low-k material layer. The metal feature is protected from the etch by the metal silicide pads. An interconnect structure having an air gap and free of defects to surfaces of the metal feature is formed.
Metal accumulation in soil can result in adverse effects on soil biota, and may concentrate metals in food chains to levels detrimental to humans and wildlife. A SETAC Pellston Workshop entitled Hazard Identification Approach For Metals And Inorganic Metal Substances examined methods for classification, ranking and screening level assessments. The Terrestrial Workgroup debated issues surrounding persistence, bioaccumulation, and toxicity metrics for soils and terrestrial organisms. Because of the long time required for metals to achieve steady-state in soils, the proposed critical load concept (the unit world model) cannot be calculated at a steady-state but must be phrased in terms of a predetermined time-frame (e.g., 100 yrs). Even so, toxicity data must be generated in a manner that accounts for ageing of metals in soil. Dissolution or transformation of sparingly soluble compounds in soils is very different from that in water, as soils provide sinks for reaction products and have large ...
It hasnt yet been a year since Desktop Metal announced the release of its two metal 3D printing systems, the DM Studio System and the DM Production System. Investors and others had been eagerly anticipating the introduction of the startups new technology, and they werent disappointed, as the Studio System and Production System looked right away to be impressive developments.. The Studio System was described by Desktop Metal as the first office-friendly metal 3D printing system, featuring a 3D printer, a debinder, and a sintering furnace that fit neatly into an office or workshop. It also introduced Bound Metal Deposition (BMD) 3D printing technology, a powder-free technology that involves the extrusion of rods of bound metal. Its safer and easier than other types of metal 3D printing technology, with support structures that can be removed by hand.. The Production System is the first metal 3D printing system to be designed for mass production. It too introduced a new 3D printing technology: ...
Metal Militia Web Radio - The best Heavy Metal on the Net. 24 hours only Heavy Metal ( Heavy Metal, Death Metal, Thrash Metal, Doom Metal, Power Metal..etc )
A process for removing metal ions such as mercury, copper, cadmium, zinc, lead, nickel or silver from polluted waters includes causing the metal polluted water and a sulfur-containing precipitating agent to diffuse through peat whereby a water insoluble sulfide of the metal is formed and is adsorbed on the peat and the metal free water is recovered. The process also relates to recovering the metal either as metal oxide or as metal in the case of silver, copper and mercury by burning the metal sulfide-containing peat.
Heavy metals are naturally occurring elements that have a high atomic weight and a density at least 5 times greater than that of water. Their multiple industrial, domestic, agricultural, medical and technological applications have led to their wide distribution in the environment; raising concerns over their potential effects on human health and the environment. Their toxicity depends on several factors including the dose, route of exposure, and chemical species, as well as the age, gender, genetics, and nutritional status of exposed individuals. Because of their high degree of toxicity, arsenic, cadmium, chromium, lead, and mercury rank among the priority metals that are of public health significance. These metallic elements are considered systemic toxicants that are known to induce multiple organ damage, even at lower levels of exposure. They are also classified as human carcinogens (known or probable) according to the U.S. Environmental Protection Agency, and the International Agency for ...
Because most commercially available coated metals are processed by a variety of coil coaters, whose primary markets have no requirements for printing (e.g., the commercial building industry), these metals are often poorly suited for screen printing. The coatings vary considerably in base chemistry and crosslink density, relating to surface hardness variables that often go beyond a UV inks ability to wet the surface (that is, the surfaces are too hard for the ink to adhere to). While one batch of metal may process well, the next could be too hard, exhibiting poor adhesion. To increase your chances of success with these commercially available metals, you should conduct a cross-hatch test on each batch before the production run. Additionally, surface-tension testing may be helpful in detecting any high levels of surfactants in the coating that could cause adhesion problems. However, the best chance you will have for successfully processing UV inks on coated metal surfaces is to control the coating ...
Calmodulin is an essential EF-hand protein with a helix-loop-helix calcium binding motif. Understanding Ca(II) dependent activation of calmodulin and other EF-hand proteins is limited by Ca(II)-induced conformational change, multiple and cooperative binding of Ca(II) ions, and interactions between the paired EF-hand motifs. The goal of this research project is to probe key determinants for calcium binding properties and pairing interactions at the site specific level using a grafting approach and high resolution NMR. An individual Ca(II) binding site of the EF-hand motifs of calmodulin was grafted into a non-calcium dependent protein, CD2, to bypass limitations associated with natural EF-hand proteins and peptide fragments. Using high resolution NMR, we have shown that the grafted EF-loop III of calmodulin in the host protein retains its native conformation with a strong loop and β-conformation preference. Grafted ligand residues in the engineered protein are directly involved in binding of Ca(II)
As noted above, the chemistry of transition metals is characterized by the partially filled d orbitals allowing for multiple oxidation states. Another consequence of their electron configuration is that these elements can form stable complexes, or coordination compounds. In such a complex, the transition metal atom or ion forms weak covalent bonds to other small molecules or ions known as ligands. In some cases, the oxidation state of the transition metal may be zero or a negative number.. Transition metal compounds are often highly colored and coordination by ligands plays a large part in determining the compounds color. In the absence of ligands, the d orbitals of an atom all have the same energy, but when surrounded by ligands, the energies of the d orbitals change and are no longer equal. This phenomenon is described by the cystal field theory. For many compounds of this type, the resulting difference in energy of the d orbitals is in the energy range of visible light. As a result, they ...
Ternary Cu/ZnO/metal oxide catalysts are prepared through the co-precipitation method under strict control of parameters like pH, calcination conditions, and precipitation temperature in a systematic manner. The metal oxides applied in this study consist of Al2O3, ZrO2, La2O3 and Ce2O3. The distinction of this work in comparison with similar research is a comprehensive investigatation of the catalytic properties of metal oxides (including conversion, selectivity and stability) which have the potential for use in the methanol steam reforming process. The catalysts are characterized through XRD, SEM and BET. The prepared catalysts are applied in methanol steam reforming in a fixed bed reactor. A TGA analysis performed for all four catalysts determined that the Ce2O3 and ZrO2 metal oxide catalysts showed the best results in terms of stability with a coke formation of 0.7wt% and 0.8wt%, respectively; and maximum surface area is related to Cu/ZnO/Ce2O3, which can result in excellent stability and Cu
Ternary Cu/ZnO/metal oxide catalysts are prepared through the co-precipitation method under strict control of parameters like pH, calcination conditions, and precipitation temperature in a systematic manner. The metal oxides applied in this study consist of Al2O3, ZrO2, La2O3 and Ce2O3. The distinction of this work in comparison with similar research is a comprehensive investigatation of the catalytic properties of metal oxides (including conversion, selectivity and stability) which have the potential for use in the methanol steam reforming process. The catalysts are characterized through XRD, SEM and BET. The prepared catalysts are applied in methanol steam reforming in a fixed bed reactor. A TGA analysis performed for all four catalysts determined that the Ce2O3 and ZrO2 metal oxide catalysts showed the best results in terms of stability with a coke formation of 0.7wt% and 0.8wt%, respectively; and maximum surface area is related to Cu/ZnO/Ce2O3, which can result in excellent stability and Cu
Our understanding of metal cycling in the modern environment has been revolutionized by improvements in sample handling (i.e., trace metal clean techniques) and by innovations in technology. These advancements have enabled researchers to accurately quantify trace metal concentrations in a range of media (water, air, sediment, biota), and thereby evaluate system response to key environmental reforms, such as the U.S. Clean Water Act of 1972 and the global effort to phase out leaded gasoline, which began in 1973. It is timely to assess our understanding of trace metal cycling in the modern environment as we embark on new global efforts to protect human and ecosystem health, such as the 2013 Minamata Convention on Mercury. We solicit presentations on trace metal cycling in a variety of systems, including water, atmosphere, sediment, and biota. We are particularly interested in research that evaluates trends and/or draws biogeochemical links among environmental spheres ...
Opera nada mais é que um espetáculo de drama e contos épicos que apresenta vários tipos de artes, entre elas a música clássica virtuosa, logo se identifica diretamente com o metal por ser um estilo de musica único e virtuoso, que apela muito para outras artes para passar sua historia geralmente baseada, assim como a opera, em contos épicos. Mas a música latina? Deu uma nova oportunidade ao metal de renovar suas historias e sua temática, passando ao utilizar essa cultura rica sem soar manjado. Essa cultura cheia de guerra e misticismo com uma música bastante particular pode oferecer muito mais ao metal. E como não imaginar Wagner escrevendo sobre os Maias? Ou sobre Malinche dos Astecas? Se os Vikings serviram para Wagner, nossos povos pré-colombianos renderiam, com certeza, uma bela Ópera. E se os celtas com suas escalas serviram para milhões de bandas de folk metal, os andinos, até agora com poucas, mostram que tem tudo haver com o metal ...
Metal-mediated base pairs represent a powerful tool for the site-specific functionlization of nucleic acids with metal ions. The development of applications of the metal-modified nucleic acids will depend on the availability of structural information on these double helices. We present here the NMR solution structure of a self-complementary DNA oligonucleotide with three consecutive imidazole nucleotides in its centre. In the absence of transition-metal ions, a hairpin structure is adopted with the artifical nucleotides forming the loop. In the presence of Ag(I) ions, a duplex comprising three imidazole-Ag+-imidazole base pairs is formed. Direct proof for the formation of metal-mediated base pairs was obtained from (1)J(N-15,Ag-107/109) couplings upon incorporation of N-15-labelled imidazole. The duplex adopts a B-type conformation with only minor deviations in the region of the artifical bases. This work represents the first structural characterization of a metal-modified nucleic acid with a ...
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Metal and metal oxide NPs such as silver, zinc, copper oxide, uraninite, and cobalt oxide have also been found to cause DNA ... Researchers have found that some metal and metal oxide NPs may affect cells inducing DNA breakage and oxidation, mutations, ... Seabra AB, Durán N (June 2015). "Nanotoxicology of Metal Oxide Nanoparticles". Metals. 5 (2): 934-975. doi:10.3390/met5020934. ... Metal based nanoparticles (NPs) are a prominent class of NPs synthesized for their functions as semiconductors, ...
Metals, woods, various materials, where obtained; means of knowing good and bad quality of materials, principal parts of ... Industrial Chemistry.-Metals.- Potassium, sodium, sal ammoniac, lime, earths, clays, iron, tin, zinc, lead, copper, mercury, ... Manufacture of Iron.-Combination of iron with carbon, sulphur, treatment of the ore, roasting, blast furnaces, metal produced, ... visit engineering and metal works, mills, coal pits, and railway plant in the neighbourhood. The classes are given to engineers ...
Merrill, J.C.; Morton, J.J.P.; Soileau, S.D. (2007). "Metals". In Hayes, A.W. (ed.). Principles and Methods of Toxicology (5th ... 2007). "Toxic effects of metals". Casarett and Doull's Toxicology: The Basic Science of Poisons (7th ed.). McGraw-Hill ...
"Nickel metal vs. Ferronickel for the production of ferrous alloys". Metals Hub GmbH.. ... Some silicon metal was also used as an alloying agent with iron. On the basis of silicon content, net production of ... or molybdenum metal. Although the United States was the second leading molybdenum-producing country in the world in 2008, it ... Metals. 9 (9): 974. doi:10.3390/met9090974. Crundwell, Frank K.; Moats, Michael S.; Ramachandran, Venkoba; Robinson, Timothy G ...
Most metal objects are made from a combination of individual metals called alloys and exhibit different strengths and colors ... Appropriate storage of metal objects helps to increase their longevity; it is recommended that metal objects be stored in ... The most common form of deterioration for metal is corrosion. Corrosion occurs when metals come into contact with water, acids ... Mechanical damage, breakage, dents, and scratches can occur from mishandling metal objects and result in damage to the metal ...
Metals. (1880 - 2 April 1921) was a British metallurgist and army officer. An Army Ordnance Corps member, in 1906 he was ... He was one of the first to study the crystalline structures of metals by polishing, etching and examination by microscope. He ... had three papers published in the Cairo Scientific Journal in 1913-4 entitled Ancient Egyptian Metal Tools; Outlines of ...
Metals can be converted in a number of ways dependently on their characteristics. Aluminium can be reused for cans as well as ... Xu, P; Chen, Z; Chen, Y; Feng, L; Wu, L; Xu, D; Wang, X; Lou, X; Lou, J (3 May 2019). "Body burdens of heavy metals associated ... Timber, plastic and metals characterise the second category. They are considered to represent an optimal and valuable source of ... Heavy metals have been reported to occur within a certain radius from the incinerators. Other toxic pollutants, including ...
The traditional metal for these bells is a bronze of about 23% tin. Known as bell metal, this alloy is also the traditional ... The pottery bells later developed into metal bells. In West Asia, the first bells appear in 1000 BC. The earliest metal bells, ... Molten bell metal is poured into the mould through a box lined with foundry sand. The founder would bring his casting tools to ... Several of these metal tubes which are struck manually with hammers, form an instrument named tubular bells or chimes. In the ...
Metals. Mainly lead-zinc mineralisations occurring in the basal Sinemurian. Found in the Charente and near Figeac, yet ...
Chen, Biao; Kondoh, Katsuyoshi (2016-09-06). "Sintering Behaviors of Carbon Nanotubes-Aluminum Composite Powders". Metals. 6 (9 ... mechanistic exploration of defensive actions of thiol drugs against a metal bound-superoxo complex". Journal of Coordination ...
Her research considered the stability of metal-ion complexes, and she worked under the supervision of Robert Williams. She ... "Metals :: Hazel Rossotti :: ISBN 0199180091 :: Oxford University Press 1971 :: OBNB, the Open British National Bibliography". ... Rossotti, Hazel (2010-09-02). "Some relationships among the stabilities of metal complexes". Recueil des Travaux Chimiques des ... She has published several science books, including: 1969 - Chemical Applications of Potentiometry 1970 - H2O 1971 - Metals 1975 ...
Chemical.-Metals. -British Manufactures, Series 4-6), (6 vols. 1844-6). The work by which he was probably best known was The ...
"Supermalloy , Nickel & Nickel Alloys , Non-ferrous Metals , Metals , Material Categories , Chemical, mechanical, physical and ...
Metals. 7 (7): 264. doi:10.3390/met7070264. Bartlett, Laura N.; Van Aken, David C.; Medvedeva, Julia; Isheim, Dieter; Medvedeva ... Metals and Materials International. 14 (4): 397-402. doi:10.3365/met.mat.2008.08.397. [1] κ Carbide in Steels] (Phase ... Metals. 8 (1): 44. doi:10.3390/met8010044. Timmerscheidt, Tobias; Dey, Poulumi; Bogdanovski, Dimitri; von Appen, Jörg; Hickel, ... an additional method to cope with hydrogen embrittlement which is normally prevented by simply minimising the contact of metal ...
Among the essential metals with which lead interacts are calcium, iron, and zinc. The lead ion has a lone pair in its ... Lead is able to bind to and interact with many of the same enzymes as these metals but, due to its differing chemistry, does ... Lead poisoning, also known as plumbism and saturnism, is a type of metal poisoning caused by lead in the body. The brain is the ... One of the first metals to be smelted and used, lead is thought to have been discovered and first mined in Anatolia around 6500 ...
Metals. 52: 971-989. Oliver, D; Brower, G (1971). "Growth of single crystal YB66 from the melt☆". Journal of Crystal Growth. 11 ... Rogl, P.; Klesnar, H.P. (1990). "Phase relations in the ternary systems rare-earth metal (RE)-boron-nitrogen, where RE = Tb, Dy ... Journal of the Less Common Metals. 133: 67. doi:10.1016/0022-5088(87)90461-9. Otani, S; Korsukova, M.M.; Mitsuhashi, T.; Kieda ... Crystal structure of boron-rich metal borides Benenson, Walter; Harris, John W.; Stöcker, Horst; Lutz, Holger (13 January 2006 ...
Georgia's main exports to Canada include: food products; textiles; metals; and vehicles. Canada is accredited to Georgia from ...
Levkiyevskaya, Yelena (2004). "Metals". In N. I. Tolstoy (ed.). Slavyanskie drevnosti. Etnolingvisticheskiy slovar Славянские ... the one who can either permit or prevent the mining of stones and metals in certain places. "The Copper Mountain" is the ...
Metals Group: Develops concessions and trades in coal, iron ore, nickel, chrome, copper, aluminum, uranium and platinum. In ... "Metals Group". Mitsubishi Corporation. Retrieved 5 June 2015. Iwata, Mari (13 October 2014). "BHP, Mitsubishi Open New Coal ...
Read, C.P. (May 1949). "A Real Lightweight - Reviewing the Make-up and Performance of a New Small Car". Light metals. Temple ...
"Strontium Titanate". ESPI Metals. ESPICorp. Archived from the original on 2015-09-24. Xiao Lin, Benoît Fauqué, Kamran Behnia ( ... Synthetics are usually transparent and colourless, but can be doped with certain rare earth or transition metals to give reds, ... These cathodes also have the advantage of not containing rare earth metals which make them cheaper than many of the ...
"Other Metals". Teck Resources. Retrieved September 22, 2019. Weber, Terry (April 30, 2001). "Teck and Cominco to merge". The ... In his 2018 ruling in Pakootas, Michel and Confederated Tribes of the Colville Reservation v. Teck Cominco Metals, the United ... with hazardous metals including arsenic, cadmium, mercury, lead, copper and zinc. A refinery belonging to Teck in Trail, ... Teck Cominco Metals, 2578982 (District Court for the Eastern District of Washington 2004). Lavoie, Judith (September 21, 2018 ...
While metals are not typically associated with polymeric structures, the inclusion of metal atoms either throughout the ... molecular electronics with non-metal elements to replace metal-based conductors, electrochromic materials, self-healing ... It typically exists in its deprotonated form, and can form salts with physiological metal cations like Ca2+, Sr2+, and Mg2+. ... This smart ability to attenuate the kind of tissue regenerated in response to different metal cations makes it a promising ...
In 1972, researchers found metallic conductivity (conductivity comparable to a metal) in the charge-transfer complex TTF-TCNQ. ... Electrically conductive polymers Traditional conductive materials are inorganic, especially metals such as copper and aluminum ... Synthetic Metals. 18 (1-3): 699-704. doi:10.1016/0379-6779(87)90964-7. Hasegawa, Tatsuo; Takeya, Jun (2009). "Organic field- ... by directly depositing a thin layer of semiconductor followed by a thin film of insulator between semiconductor and the metal ...
"Rimex Metals , Applications , Architecture , Knightsbridge Station, London, UK". www.onetex.com. Retrieved 30 November 2017. " ... The platforms were refurbished in 2005, with the 1930s cream-coloured tiles being concealed behind a modern metal cladding ...
The company operates three gold and silver mines in Mexico (Industrias Peñoles retained the rights to its primary base metals ... "Fresnillo IPO to raise US$900 million". Metals Place. 14 April 2008. Archived from the original on 12 July 2012. Retrieved 24 ... Fresnillo plc is an Anglo-Mexican precious metals mining company incorporated in the United Kingdom and headquartered in Mexico ...
Synthetic Metals. 77 (1-3): 265-272. doi:10.1016/0379-6779(96)80100-7. Blank, V (1996). "Phase transformations in solid C60 at ... Synthetic Metals. 70 (1-3): 1411-1412. doi:10.1016/0379-6779(94)02900-J. Blank, V (1995). "Ultrahard and superhard carbon ...
The original article on the Kataura plot has been reported in a lesser-known journal Synthetic Metals. Nevertheless, this ... Synthetic Metals. 103 (1-3): 2555-2558. doi:10.1016/S0379-6779(98)00278-1. Web of Science database Official website Prof. ...
"Alkali Metals". hyperphysics.phy-astr.gsu.edu. Retrieved 2020-09-13. "The Alkali Metals , Introduction to Chemistry". courses. ... This occurs because the outer electron in the alkali metals requires a much lower amount of energy to be removed from the atom ... This also gives rise to low electronegativity values for the alkali metals. The trends and exceptions are summarized in the ... Francium's ionization energy is higher than the precedent alkali metal, cesium. This is due to its (and radium's) small ionic ...
Metal alloys used in building include bronze (mainly copper and tin); brass (copper and zinc); monel metal and nickel silver, ... the alloying of tin with other metals such as copper to form bronze, and the coating of tin on harder metals, such as tinplated ... Monel metal is an alloy of approximately two-thirds nickel and one-third copper. It is similar to platinum in color. Monel ... Zinc-coated metals were first patented in 1837, separately by M. Sorel in France and H. W. Crawford in England. The methods ...
VDM Metals. Retrieved 2019-07-23. "VDM Metals introduces new metal dusting resistant alloy at Achema". VDM Metals. Retrieved ... "Locations". www.vdm-metals.com. 2019-03-25. Retrieved 2019-07-23. "VDM Metals". www.vdm-metals.com. 2019-07-23. Retrieved 2019- ... "VDM Metals restructures its organization". VDM Metals. 2016-06-01. Retrieved 2020-01-20. "Fields of application". www.vdm- ... "Outokumpu VDM now operating under the name of VDM Metals". VDM Metals. "Lindsay Goldberg acquires VDM group" (PDF). Lindsay ...
In 2001 Metal Bulletin bought American Metal Market. Metal Bulletin PLC was in turn bought in 2006 by Euromoney Institutional ... Tarring, Trevor (2013-01-18). "Metal Bulletin Centenary: The birth of Metal Bulletin". Metal Bulletin. Archived from the ... non-ferrous and scrap metals markets. What was later known as Metal Bulletin was started in 1913 as Quins Metal Market Letters ... "About Metal Bulletin". Metal Bulletin. Archived from the original on 2012-05-11. Retrieved 2019-12-22.CS1 maint: unfit URL ( ...
The higher relative values of these metals are driven by various factors including their rarity, uses in industrial processes ... A classification of metals that are considered to be rare and/or have a high economic value. ... What are Precious Metals. Precious metals refer to the classification of metals that are considered to be rare and/or have a ... BREAKING DOWN Precious Metals. Investors can participate in precious metals by purchasing the physical asset, purchasing ...
Since 1961, Precoat Metals has been setting the standards in the coil coatings industry; worldwide as an innovator in both ...
... and Physical Chemistry of Surfaces is an international peer reviewed journal that publishes articles ... Protection of Metals and Physical Chemistry of Surfaces is an international peer reviewed journal that publishes articles ... Protection of Metals and Physical Chemistry of Surfaces is an international peer reviewed journal that publishes articles ... Protection of Metals and Physical Chemistry of Surfaces is a peer reviewed journal. We use a single blind blind peer review ...
All other metals are light metals. Base, noble and precious metals. Main articles: Base metal, noble metal, and precious metal ... Heavy and light metals. Main articles: Heavy metals and Light metals. A heavy metal is any relatively dense metal or metalloid. ... brittle metals and refractory metals; white metals; heavy and light metals; and base, noble, and precious metals. The Metallic ... Alkali metal Alkaline earth metal Lan-thanide Actinide Transition metal Post-​transition metal Metalloid Reactive nonmetal ...
worth, horror, horror, blood, blood, metal, metal, music, mucic, dark, dark, evil, evil, View My Guestbook. Sign My Guestbook. ... worth, horror, horror, blood, blood, metal, metal, music, mucic, dark, dark, evil, evil, dallas, dallas, bands, bands, ft. ... worth, horror, horror, blood, blood, metal, metal, music, mucic, dark, dark, evil, evil, dallas, dallas, bands, bands, ft. ... worth, horror, horror, blood, blood, metal, metal, music, mucic, dark, dark, evil, evil, dallas, dallas, bands, bands, ft. ...
Both patients had metal-on-metal hip prostheses, and both patients cobalt levels were reduced after removal of the metal-on- ... An additional problem with metal-on-metal bearings is that they release a variety of metal ions into local tissue and the ... 2008 John Charnley award: metal ion levels after metal-on-metal total hip arthroplasty: a randomized trial. Clin Orthop Relat ... In an attempt to decrease wear at the interface of the articulation, metal-on-metal bearings (Box), composed of cobalt and ...
... the Fast Money guys reveal how theyre trading precious metals in the wake of the recent carnage. Also find out how theyre ... In Thursdays Web.Extra, the Fast Money guys reveal how theyre trading precious metals in the wake of the recent carnage. Also ...
Latest Precious metals industry News. Gas leak prompts hotel evacuation, sends 16 to hospital. Jul. 13, 2019 2:33 PM EDT ...
The metals we call noble wont. combine with other elements,. dont interact with water, air.. Of course that means they dont ...
Scientific American is the essential guide to the most awe-inspiring advances in science and technology, explaining how they change our understanding of the world and shape our lives.
Trade the most liquid metals markets in the world with CME Group Metals Products including Gold, Copper, and Silver Futures and ... Precious Metals *Manage your risk in the highly responsive metals markets with Precious Metals, including gold, silver, ... Q2 Precious Metals Update *Check in on the Q2 Precious Metals markets, including a 14% rise in open interest for Gold futures a ... Metals Options *Express your opinion in the metals market and manage price risk with our comprehensive suite of COMEX and NYMEX ...
... potentially toxic metals. Heavy metals testing is used to screen for poisoning due to metals such as lead, mercury, arsenic, ... Some metals are much more toxic than others, and one form of a metal may be more harmful than other forms, such as an organic ... Heavy metals testing is used to screen for or to diagnose heavy metal poisoning in those who may have been acutely or ... A heavy metals panel is a group of tests that measures the quantity of specific potentially toxic metals in the blood, urine or ...
One common myth is that this method provides a total metals result, but this is not the case, as many silicate minerals are not ... The energy emitted will be at specific wavelengths, according to the metals present in the sample, and this energy is detected ... The preparation method is critical to assessing the concentration of metals in a soil sample. The following are questions to be ... Subpart XXXXXX-National Emission Standards for Hazardous Air Pollutants Area Source Standards for Nine Metal Fabrication and ...
While some metals are essential as nutrients, all metals can be toxic at some level. Some metals are toxic in minute amounts. ... Suspended metals are those that remain on the 0.45 μM filter. "Acid extractable metals" refers to the concentration of metals ... One reason to list metals as a candidate cause is the presence of metal sources or other evidence of metals in a stream or ... While metal precipitation removes much metal from the water column, the water still may carry toxic metal concentrations ...
Public Comments on Metals and Controls Corp. Documents. How to Submit Comments. Comments on Metals and Controls Corp. Documents ... Advisory Board Work Group on Metals and Controls Corp.. This Work Group is responsible for a review of the Metals and Controls ... Advisory Board and NIOSH Discussions on Metals and Controls Corp.. The Metals and Controls Corp. discussion papers listed below ... NIOSH/ORAU: Metals and Controls Corp. Maintenance Exposure Model dated October 24, 2018 pdf icon[60 KB (19 pages)]. October 24 ...
Metal deactivators, or metal deactivating agents (MDA) are fuel additives and oil additives used to stabilize fluids by ... Metal Deactivators *^ Dabelstein, W.; Reglitzky A.; Schutze A.; Reders, K. "Automotive Fuels". Ullmanns Encyclopedia of ... An example of a metal deactivator used for gasoline and jet fuels is salpn. It is used in turbine and jet fuels, diesel, ... Metal deactivators inhibit the catalytic effects of such ions, especially copper, retarding the formation of gummy residues (e. ...
Pages in category "Alkali metals". The following 7 pages are in this category, out of 7 total. ... Media in category "Alkali metals". The following 5 files are in this category, out of 5 total. ... Alkali metals reations.webm 2 min 6 s, 540 × 360; 9.16 MB. ... Category:Alkali metals. From Wikimedia Commons, the free media ... Retrieved from "https://commons.wikimedia.org/w/index.php?title=Category:Alkali_metals&oldid=257274741" ...
... Paul Vigna and Lear Capital CEO Scott Carter discuss how commodities will be affected by the ... liquidity and thats to be bullish for the metals market as well as equities ... but thats assuming that they cut ten billion ... even overseas for all we focus alot on on equities is going to affect other markets of all bonds obviously but also the metals ...
Commercial Metals Co. reported second-quarter net income Tuesday of $80.1 million, or $1.29 a share, compared with $56.6 ... NEW YORK (MarketWatch) - Commercial Metals Co. CMC, -1.37% reported second-quarter net income Tuesday of $80.1 million, or $ ... according to the steel and metals companys outlook. ...
Much has yet to be learned regarding the alloys of metals, because a very small difference in the proportions of the metals ... This table exhibits the remarkable fact that cast iron is harder than all the other metals; it was found to be harder than any ... It was found that some brasses were harder than any of the metals composing them, and strange to relate, this hardness is due ... Calvert and Johnson made a series of experiments with pretty large masses of metal to test their comparative hardness; and the ...
They are generally designed to precipitate trace metals to their solubility limits and obtain additional removal by ... Source for information on Heavy Metals Precipitation: Environmental Encyclopedia dictionary. ... The principle technology to remove metals pollutants from wastewater is by chemical precipitation. Chemical precipitation ... Precipitation processes are characterized by the solubility of the metal to be removed. ...
Gold, aluminum and various other metals were also mostly higher. ... Weaker Dollar Boosts Metals. Prices for copper, gold, aluminum ... Copper prices rose on Tuesday, with a drop in the U.S. dollar allowing the industrial metal to recover from heavy selling last ...
Then, they grew all kinds of metal nanocrystals measuring between 2 and 200 nanometers on what they call a cotton assembly ... have created a new form of metal crystals grown on cotton. Theyve used acid-treated cellulose fibers from cotton to ... nickel and other metal and metal-oxide nanocrystals quickly and of uniform size, Shin said. The metals display catalytic, ... Growing metals on cotton. Researchers at the Pacific Northwest National Laboratory (PNNL) have created a new form of metal ...
... metals represent up to 75% of the elements in the principal groups and all the elements in the accessory groups, the ... Although so-called metal test series with rarely sensitizing metals for patch testing exist, most of these metals have not been ... Because metals may have an irritant potential and some metals are even toxic to the human organism, it is mandatory that the ... Apart from the common sensitizing metals, nickel, cobalt, and chromium, there are many more commonly occurring metals present ...
METALS CONCEPT The six alkaline earth [2] metals-beryllium, magnesium, calcium, strontium, barium, and radium-comprise Group 2 ... The alkaline earth metals are less reactive than the alkali metals, but like the alkali metals they are much more reactive than ... Characteristics of the Alkaline Earth Metals. Like the alkali metals, the alkaline earth metals have the properties of a base, ... These include (in addition to the alkaline earth metals and the alkali metals) the transition metals, halogens, noble gases, ...
... transition metals, other metals, metalloids, non-metals, halogens, noble gases, and rare-earth metals. These rare-earth metals ... Base Metals In chemistry, metals that oxidize or corrode easily are referred to as base metals. These industrial metals ... Among these elements are base metals, precious metals, and rare-earth metals, which provide a variety of opportunities for ... precious metals are valuable - much more so than the base metals. Precious metals are used for jewelry, art, coins, dental work ...
About Silvercorp Metals Inc. Silvercorp Metals Inc. (Silvercorp) is a mining company producing silver, lead and zinc metals in ... BRIEF-Silvercorp Metals Qtrly Net Income Attributable To Equity Shareholders $0.08 Per Share. * SILVERCORP METALS INC - QTRLY ... BRIEF-Silvercorp Metals announces share repurchase program. * Silvercorp Metals Inc - announces Normal Course Issuer bid to ... BRIEF-Silvercorp Metals Q2 earnings per share $0.07. * Q2 sales rose 3 percent to $47.5 million Source text for Eikon: Further ...
  • In chemistry, two elements that would otherwise qualify (in physics) as brittle metals- arsenic and antimony -are commonly instead recognised as metalloids , on account of their chemistry (predominately non-metallic for arsenic, and balanced between metallicity and nonmetallicity for antimony). (wikipedia.org)
  • The number is inexact as the boundaries between metals, nonmetals , and metalloids fluctuate slightly due to a lack of universally accepted definitions of the categories involved. (wikipedia.org)
  • Metals and metalloids are electropositive elements that occur in all ecosystems, although natural concentrations vary according to local geology. (epa.gov)
  • This module addresses water column contamination by metals and metalloids that commonly cause toxic effects. (epa.gov)
  • thus all elements are classified either as metals, metalloids, and nonmetals. (encyclopedia.com)
  • In the past decade, sporadic shortages of metals and metalloids crucial to modern technology have inspired attempts to determine the relative "criticality" of various materials as a guide to materials scientists and product designers. (pnas.org)
  • In the present study, we develop a comprehensive, flexible, and transparent approach that we apply to 62 metals and metalloids. (pnas.org)
  • We here characterize the criticality of 62 metals and metalloids in a 3D "criticality space" consisting of supply risk, environmental implications, and vulnerability to supply restriction. (pnas.org)
  • Metals, metalloids, and radionuclides all are trace elements that occur naturally in the Earth's crust. (usgs.gov)
  • The history of refined metals is thought to begin with the use of copper about 11,000 years ago. (wikipedia.org)
  • Their respective densities of 1.7, 2.7 and 4.5 g/cm 3 can be compared to those of the older structural metals, like iron at 7.9 and copper at 8.9 g/cm 3 . (wikipedia.org)
  • C3 Metals Inc. is focused on creating substantive long-term value for its shareholders through the discovery and development of large copper and gold deposits. (yahoo.com)
  • C3 Metals also holds a 100% interest in five licenses covering 207 km 2 of highly prospective copper-gold terrain in Jamaica, a 100% interest in two porphyry copper-gold properties (one under option to Tocvan Ventures) covering 304 km 2 in the Cascade Magmatic Arc of southwestern British Columbia and a 100% interest in the 46 km 2 Stewart Brook gold project in the Meguma belt of Nova Scotia. (yahoo.com)
  • Other panels may include one or more additional metals, such as cadmium, copper , or zinc. (labtestsonline.org)
  • Metal deactivators inhibit the catalytic effects of such ions, especially copper , retarding the formation of gummy residues (e.g. gels containing copper mercaptide ). (wikipedia.org)
  • Wai In a series of bronze alloys containing tin \fi and copper, it was found that an excess of tin ^U was the cause of softness, while an excess of :opper, although it is such a malleable metal, is the-cause of brittleness. (scientificamerican.com)
  • In alloys of copper and tin-common bronze- an excess of tin renders the alloy soft, as would be expected, because it is the softer metal. (scientificamerican.com)
  • On the other hand, an increased quantity of copper-from but one-third to that of the quantity of tin in the bronze, up until it (the copper) is four times the quantity of tin-renders the alloy brittle, a result which would not be expected, judging from the nature of the metals in their simple conditions. (scientificamerican.com)
  • Copper prices rose on Tuesday, with a drop in the U.S. dollar allowing the industrial metal to recover from heavy selling last week. (wsj.com)
  • Using acid-treated cellulose fibers from cotton as a natural template, the PNNL team has been able to grow gold, silver, palladium, platinum, copper, nickel and other metal and metal-oxide nanocrystals quickly and of uniform size, Shin said. (zdnet.com)
  • These industrial metals include copper (Cu on the periodic table), nickel (Ni), aluminum (Al), zinc (Zn), lead (Pb), tin (Sn) and iron (Fe)/steel (an alloy of iron and carbon). (investopedia.com)
  • Base metals are generally plentiful and are used in a variety of commercial and industrial applications, such as copper plumbing, aluminum cans and the steel used in automobile production. (investopedia.com)
  • Futures and options contracts of individual metals can be traded, such as copper futures (product symbol: HG) and options (product symbol: HX) on CME Globex. (investopedia.com)
  • In addition to iron, early guards were made from alloys of copper and other 'soft metals. (earthlink.net)
  • The copper carbonate is first heated to produce copper(II) oxide , which is then reduced to the metal using carbon as a reducing agent . (rsc.org)
  • It contains copper, but how can copper metal be obtained from it? (rsc.org)
  • While the copper(II) oxide produced by heating cools down, discuss how to get the oxygen out of the oxide, leaving the metal itself. (rsc.org)
  • The purpose of the thin layer of charcoal on the surface of the mixture is to minimise the chance of the hot copper metal re-oxidising during the pouring-out process. (rsc.org)
  • Scrap metal , used metals that are an important source of industrial metals and alloys, particularly in the production of steel, copper , lead, aluminum , and zinc . (britannica.com)
  • Three-month copper on the London Metal Exchange eased 0.1 percent to $6389 a tonne by 0208 GMT, while nickel fell 0.2 percent, zinc was down 0.2 percent and lead decreased 0.3 percent. (cnbc.com)
  • The list of most conductive metals includes silver, copper and gold. (reference.com)
  • The metals that conduct electricity the best are silver, copper and aluminum. (reference.com)
  • Duluth Metals Limited is committed to acquiring, exploring and developing copper, nickel and platinum group metal (PGM) deposits. (newswire.ca)
  • The Duluth Complex hosts one of the world's largest undeveloped repositories of copper, nickel and PGMs, including the world's third largest accumulation of nickel sulphides, and one of the world's largest accumulations of polymetallic copper and platinum group metals. (newswire.ca)
  • Tin is too soft to be used by itself for architectural purposes so it generally falls into two categories: the alloying of tin with other metals such as copper to form bronze, and the coating of tin on harder metals, such as tinplated iron or steel. (wikipedia.org)
  • In 1969, the plant in Cologne was shut down and the remaining works were combined into seven business units: Copper and copper alloys Conducting materials Prefabricated parts Nickel and special materials Light metal Plastics processing Packaging solutions Despite the restructuring and some acquisitions in the 1970s, sales continued to decline. (wikipedia.org)
  • The most popular precious metals with investors are gold, platinum and silver, and precious metals used in industrial processes include iridium , which is used in specialty alloys and palladium , which is used in electronics and chemical applications. (investopedia.com)
  • Much has yet to be learned regarding the alloys of metals, because a very small difference in the proportions of the metals employed produces a great difference in the quality of the alloy sought to be obtained. (scientificamerican.com)
  • Every person is familiar with regard to the comparative hardness of these two bodies, but very few are acquainted with the comparative hardness of other bodies, especially metals and their alloys, although a scale of hardness has long been adopted among mineralogists. (scientificamerican.com)
  • The Metals and Metallic Nanostructures (MMN) Program supports fundamental research and education on the relationships between processing, structure and properties of metals and their alloys. (nsf.gov)
  • VDM Metals Group (formerly Vereinigte Deutsche Metallwerke) based in Werdohl, Germany, is a manufacturer of corrosion-resistant, heat-resistant and high-temperature nickel alloys, cobalt and zirconium alloys as well as high-alloyed special stainless steels. (wikipedia.org)
  • In the early 1950s, VDM became the world's largest manufacturer and distributor of raw, semi-finished and finished non-ferrous metals and alloys. (wikipedia.org)
  • Metals covered include carbon steel, stainless and special steel, scrap and secondary, ores and alloys, raw materials, minor and precious metals, and base metals with additional coverage of freight news, capital markets, and exchange news and prices. (wikipedia.org)
  • The six alkaline earth metals - beryllium, magnesium, calcium, strontium, barium, and radium - comprise Group 2 on the periodic table of elements. (encyclopedia.com)
  • These include (in addition to the alkaline earth metals and the alkali metals) the transition metals, halogens, noble gases, lanthanides, and actinides. (encyclopedia.com)
  • Where families are concerned, there are certain observable properties that led chemists in the past to group the alkaline earth metals together. (encyclopedia.com)
  • These properties will be discussed with regard to the alkaline earth metals, but another point should be stressed in relation to the division of elements into families. (encyclopedia.com)
  • In this respect it is more similar to the alkaline-earth metals than to the alkali metals. (everything2.com)
  • The alkaline earth metals provide a good example of group trends in properties in the periodic table, with well-characterized homologous behavior down the group. (princeton.edu)
  • The alkaline earth metals are silver colored, soft metals , which react readily with halogens to form ionic salts , and with water , though not as rapidly as the alkali metals , to form strong alkaline ( basic ) hydroxides . (princeton.edu)
  • All the alkaline earth metals have two electrons in their valence shell, so the energetically preferred state of achieving a filled electron shell is to lose two electrons to form doubly charged positive ions . (princeton.edu)
  • The alkaline earth metals are named after their oxides , the alkaline earths , whose old-fashioned names were beryllia , magnesia , lime , strontia and baryta . (princeton.edu)
  • It was found that some brasses were harder than any of the metals composing them, and strange to relate, this hardness is due to the softer metal-the zinc. (scientificamerican.com)
  • The SRB has in the past bought other metals such as aluminium and zinc domestically as a means of supporting local producers. (reuters.com)
  • Silvercorp Metals Inc. (Silvercorp) is a mining company producing silver, lead and zinc metals in concentrates from mines in China. (reuters.com)
  • Some heavy metals, like iron and zinc, are essential nutrients at low concentrations but toxic at high concentrations. (usgs.gov)
  • Zinc-coated metals were first patented in 1837, separately by M. Sorel in France and H. W. Crawford in England. (wikipedia.org)
  • Decorative architectural elements were frequently cast in zinc, since it molded readily, was inexpensive compared to stone, and could be painted to imitate more expensive metals. (wikipedia.org)
  • Among the industrial metals, July platinum climbed to $544.80 an ounce, up $9.50. (marketwatch.com)
  • SINGAPORE, April 30 (Reuters) - Most industrial metals fell on Tuesday, after data showed growth in China's factory activity unexpectedly slowed in April, suggesting the economy is still struggling to regain traction. (cnbc.com)
  • A heavy metals panel is a group of tests that measures the quantity of specific potentially toxic metals in the blood, urine or, more rarely, in the hair or other body tissue or fluid. (labtestsonline.org)
  • A laboratory may offer several different groupings of heavy metals panels as well as tests for individual metals. (labtestsonline.org)
  • The term "heavy metals" is loosely defined. (labtestsonline.org)
  • Significant concentrations of any of the heavy metals can be irritating or damaging to the body and can contaminate soil, air, food, and water, persisting indefinitely in the environment. (labtestsonline.org)
  • Because they are a source of potential injury, the term "heavy metals" is frequently used interchangeably with the term "toxic metals. (labtestsonline.org)
  • Heavy metals are present in many industrial wastewaters. (encyclopedia.com)
  • In 1995, as a result of work done to increase the range of pressure open to investigation, laboratory shock generators driven by high explosives were built and used in Russia to generate pressures higher than 2.5 TPa in heavy metals. (springer.com)
  • Nearly half of 45 fruit juices tested had elevated levels of heavy metals, which can pose health risks for children and adults, Consumer Reports has found. (medscape.com)
  • The new evaluation was done to see if there's been improvement, to test other juices, and to test for other heavy metals. (medscape.com)
  • Seven of the 21 had enough heavy metals to potentially harm children who drink a half-cup or more a day, and nine of the 21 held risks for kids drinking a cup or more a day. (medscape.com)
  • There is no scientific evidence indicating that the presence of trace levels of heavy metals in juice has caused any negative health outcomes among individuals at any life stage. (medscape.com)
  • What Are the Health Risks From Heavy Metals? (medscape.com)
  • Depending on how much and how long the exposure is, heavy metals can pose risks to children and adults. (medscape.com)
  • Experts worry about accumulated heavy metals not from only juice, but other sources. (medscape.com)
  • plants absorb the heavy metals from contaminated soil and water, CR says. (medscape.com)
  • Among the misconceptions among parents, he says, is that organic juices are lower in heavy metals. (medscape.com)
  • There is no agreed-upon definition of "heavy metals," but heavy metals generally are considered to be those metals with a high density. (usgs.gov)
  • Coal contains many heavy metals, as it is created through compressed organic matter containing virtually every element in the periodic table - mainly carbon, but also heavy metals. (sourcewatch.org)
  • Small amounts of heavy metals can be necessary for health, but too much may cause acute or chronic toxicity (poisoning). (sourcewatch.org)
  • Many of the heavy metals released in the mining and burning of coal are environmentally and biologically toxic elements, such as lead , mercury , nickel , tin , cadmium , antimony , and arsenic , as well as radio isotopes of thorium and strontium . (sourcewatch.org)
  • The electric power sector is the largest source of toxic pollutants in the United States, due to coal ash and coal waste , which contain toxins such as heavy metals. (sourcewatch.org)
  • Burning coal produces airborne compounds, known as fly ash and bottom ash (collectively referred to as coal ash ), which can contain large quantities of heavy metals that settle or wash out of the atmosphere into oceans, streams, and land. (sourcewatch.org)
  • As a result, heavy metals such as mercury are concentrated in what the EPA considers "recycled air pollution control residue. (sourcewatch.org)
  • Coal sludge , the liquid coal waste produced by mining activities (also known as slurry), contains heavy metals. (sourcewatch.org)
  • The constant leaching of heavy metals from coal mining and coal plants leads to bioaccumulation in plants and animals, creating the danger of toxicity. (sourcewatch.org)
  • Around 95 of the 118 elements in the periodic table are metals (or are likely to be such). (wikipedia.org)
  • Group I of the Periodic Table is composed of highly reactive metals. (gsu.edu)
  • In the periodic system, metals represent up to 75% of the elements in the principal groups and all the elements in the accessory groups, the lanthanides and the actinides. (springer.com)
  • Also, like the alkali metals , or indeed any other family on the periodic table , not all members of the alkali metal family are created equally in terms of their abundance on Earth or their usefulness to human life. (encyclopedia.com)
  • For instance, metals, which comprise the vast majority of elements on the periodic table, tend to be shiny, hard, and malleable (that is, they can bend without breaking. (encyclopedia.com)
  • As noted, the alkaline earth metal family occupies the second group, or column, in the periodic table. (encyclopedia.com)
  • A group of six highly reactive metal s, group IA of the Periodic Table of the Elements including, in increasing order of atomic weight and reactivity, lithium , sodium , potassium , rubidium , cesium , and francium . (everything2.com)
  • The alkali metals also react with nonmetal s in Groups VA and VIA of the periodic table . (everything2.com)
  • There are more than 90 metals in the periodic table. (eurekalert.org)
  • The prevalence of metal allergy in the general population is high: up to 17% of people are allergic to nickel, and 1-3% to cobalt and chromium. (springer.com)
  • Smaller amounts of tin , nickel , magnesium , and precious metals are also recovered from scrap. (britannica.com)
  • Investors can participate in precious metals by purchasing the physical asset , purchasing futures contracts for the particular metal or through the purchase of shares in publicly traded companies engaged in the exploration or production of precious metals. (investopedia.com)
  • A wide variety of commodities are traded in the futures market , including precious metals. (investopedia.com)
  • Futures offer investors a leveraged means of buying or selling precious metals, set at a specific price and time in the future. (investopedia.com)
  • Aside from physical possession of precious metals, investors can trade stocks, futures, options, mutual funds and exchange-traded funds based on precious metal holdings. (investopedia.com)
  • NEW YORK (CBS.MW) -- A fall in the overall U.S. stock market Wednesday helped bring gold futures prices back above $300 an ounce and provided a lift to shares of most metals companies. (marketwatch.com)
  • She has spent the bulk of her years at the company writing the daily Futures Movers and Metals Stocks columns and has been writing the weekly Commodities Corner column since 2005. (marketwatch.com)
  • T wo current and one former precious metals traders at JPMorgan Chase have been charged with manipulating futures markets in what prosecutors described as a massive, multi-year conspiracy run out of the bank. (telegraph.co.uk)
  • Each afternoon Ira Epstein gets you up to speed on what happened in the metals futures markets. (futuresmag.com)
  • Precious metals miner Randgold Resources lost 1.3 percent, retreating with a 2 percent tumble by the spot gold price in Asian trade after heavy losses on U.S. gold futures on technical selling. (nasdaq.com)
  • Cash-Settled Spread and Ratio contracts, including Gold/Silver Ratio, Gold/Platinum Spread and Platinum/Palladium Spread futures, are the newest addition to CME Group's suite of Precious Metals products. (cmegroup.com)
  • Magnesium, aluminum and titanium are light metals of significant commercial importance. (wikipedia.org)
  • Reinforced light metals, therefore, offer a promising approach due to their high strength to weight ratio. (sae.org)
  • The potential of reinforced light metals is shown by means of compression samples cast in laboratory scale. (sae.org)
  • Reinforced Light Metals for Automotive Applications," SAE Technical Paper 2007-01-1228, 2007, https://doi.org/10.4271/2007-01-1228 . (sae.org)
  • Sainio EL, Jolanki R, Hakala E, Kanerva L. Metals and arsenic in eye shadows. (springer.com)
  • But in the new report, every juice contained at least one of the four metals tested, and 47%, or 21, had concerning levels of cadmium, inorganic arsenic, and/or lead. (medscape.com)
  • Toronto, Ontario--(Newsfile Corp. - December 1, 2020) - C3 Metals Inc. (TSXV: CCCM) is pleased to advise the appointment of Fernando Pickmann as a Director of the Company effective December 1st, 2020. (yahoo.com)
  • Drexel Metals design pressures, wind uplifts and test reports are for specific deck attachments, material gauges, clip spacing and panel widths. (yudu.com)
  • [1] Many elements and compounds that are not normally classified as metals become metallic under high pressures. (wikipedia.org)
  • In chemistry, metals that oxidize or corrode easily are referred to as 'base metals. (investopedia.com)
  • Because of their abundance, prices for base metals are far below those of both precious and rare-earth metals, and prices respond to changes in demand for the products for which the metals are used. (investopedia.com)
  • Investors and traders can participate in the base metals market in a number of ways. (investopedia.com)
  • Base metals may not glitter like gold, but they can still guide an investor to a conclusion about overall economic health, check out Using Base Metals As An Economic Indicator . (investopedia.com)
  • Because of their scarcity, precious metals are valuable - much more so than the base metals. (investopedia.com)
  • Like base metals, a wide range of investment vehicles are available to those interested in the precious metals markets. (investopedia.com)
  • The single most popular precious metal for investment purposes is gold, followed by silver, and there are several options for gaining exposure. (investopedia.com)
  • Publicly traded mining companies offer exposure to precious metals at the producer level, but this category has underperformed other vehicles due to a variety of challenges including high company debt levels, rising labor costs and environmental issues. (investopedia.com)
  • For investors seeking diversified exposure to precious metals mining companies, there are numerous mutual funds offering exposure in varying geographies and markets caps. (investopedia.com)
  • The widest range of investment strategies for precious metals can be found in exchange-traded funds with options including junior and senior producers, gold bullion, and leveraged exposure. (investopedia.com)
  • The signs and symptoms that a person may experience depend upon the type of metal, its form, the quantity, the length of exposure, the type of exposure, the age of the person, and the person's general state of health. (labtestsonline.org)
  • The goal of this project is to identify and quantify the metal content of e-cigarette aerosols generated by a variety of products and designs, to examine the cytoxicity (i.e. toxicity to cells) and genotoxicity (i.e., toxicity to genetic information within cells) of aerosols with metal content, and to examine biomarkers of metal exposure and effects in users. (fda.gov)
  • and (3) to measure biomarkers of metal exposure and effects in e-cigarette users by comparing 75 adults aged 21-40 who use e-cigarettes only, conventional cigarettes only, or no tobacco products, by analyzing metals in oral cavity cells and metal concentrations in saliva, blood, and urine. (fda.gov)
  • For others, exposure to metals to which they are sensitive may cause the development of hidden inflammation, which can become chronic if not addressed. (prweb.com)
  • Common and uncommon metal allergens and sources of exposure are then reviewed in depth, and detailed sections are devoted to hypersensitivity to metal implants (which may be associated with device failure and/or dermatitis), metal allergy in select patient populations, and less frequently encountered manifestations of metal allergy. (springer.com)
  • Designed to provide you with another way to manage your precious metals price exposure. (cmegroup.com)
  • Precious metals are naturally occurring metallic chemical elements that have a high luster and melting point, are softer and more ductile than other metals and are less reactive than most elements. (investopedia.com)
  • They are the most reactive metal s, and always occur in nature in combination with other elements. (everything2.com)
  • The alkali metals are extremely reactive and combine readily with most of the substances found in the atmosphere . (everything2.com)
  • When identifying sources of metals, consider both non-point and point sources. (epa.gov)
  • The lack of available money to invest in finding new sources of metals, coupled with major miners focusing on debt reduction has caused a plunge in investment. (telegraph.co.uk)
  • Impairments result when metals are biologically available at toxic concentrations affecting the survival, reproduction and behavior of aquatic organisms. (epa.gov)
  • Although so-called metal test series with rarely sensitizing metals for patch testing exist, most of these metals have not been systematically evaluated regarding the compounds, the concentrations, and the vehicles that are used for patch testing. (springer.com)
  • In this chapter, we give an overview of metal compounds, concentrations, and vehicles (if indicated) as reported in the literature. (springer.com)
  • badges: CoalSwarm}} Heavy metal refers to any metallic chemical element that has a high density and is toxic or poisonous at low concentrations. (sourcewatch.org)
  • Precious metal includes silver (Ag), gold (Au), platinum (Pt) and palladium (Pd). (investopedia.com)
  • In particular, the arrival of two new ETFs makes it easier than ever to invest in platinum and palladium, two precious metals with a wider array of industrial uses than gold and silver. (kiplinger.com)
  • Palladium led declines for metals, after the head of the European Central Bank expressed concern over the rise in the euro. (yahoo.com)
  • LBMA Trade Data ( formerly LBMA-i Precious Metals Data ) provides a daily snapshot of the size of the LBMA membership's share of the Loco London and Loco Zurich OTC market for precious metals - covering Gold, Silver, Platinum and Palladium. (nasdaq.com)
  • These materials combine the hardness of metal with the high surface area of carbon to form metal carbides that are stronger than steel and can withstand temperatures to 1,400 degrees Celsius. (zdnet.com)
  • The other alkali metals do not form stable carbides, although they do react with the graphite form of carbon to give intercalation compounds . (everything2.com)
  • Organic mercury and tributyl tins are special forms of metals that are beyond the scope of this module. (epa.gov)
  • The alkali metals all react vigorously, and often violently, with water , releasing hydrogen and forming strong caustic solutions. (everything2.com)
  • Some metals are toxic in minute amounts. (epa.gov)
  • In the liquid state, alkali metals can be ignited in air with ease, generating large amounts of heat and a dense choking smoke of the oxide. (everything2.com)
  • This volume has been compiled in response to the ongoing revolution in our understanding of metal contact allergy, and the ensuing challenge this has created for clinicians and others to synthesize large amounts of sometimes contradictory data. (springer.com)
  • VANCOUVER , June 1, 2017 /CNW/ - AZARGA METALS CORP. (' Azarga Metals ' or the ' Company ') (TSX-V:AZR) reports that the Company has reached certain settlement agreements with the minority shareholders of the Company's 60% owned subsidiary, Azarga Metals Limited ('Azarga BVI') to accept common shares of the Company in settlement of amounts owing. (newswire.ca)
  • The patient's original hip replacement had been done in 2006 with an ASR (articular surface replacement) hip prosthesis (ASR XL Acetabular Hip System [DePuy Orthopaedics, Warsaw, Ind, USA]), comprising a large-diameter metal (cobalt and chromium) cup with a large modular metal head on a titanium Corail stem ( Box ). (mja.com.au)
  • A number of metals and elements in electronic cigarette (e-cigarette) aerosol - such as lead, chromium, iron, strontium, and aluminum - are known carcinogens, respiratory toxicants/irritants, reproductive and developmental toxicants, or have other human health effects. (fda.gov)
  • The solid or liquid state of metals largely originates in the capacity of the metal atoms involved to readily lose their outer shell electrons. (wikipedia.org)
  • Broadly, the forces holding an individual atom's outer shell electrons in place are weaker than the attractive forces on the same electrons arising from interactions between the atoms in the solid or liquid metal. (wikipedia.org)
  • The electrons involved become delocalised and the atomic structure of a metal can effectively be visualised as a collection of atoms embedded in a cloud of relatively mobile electrons. (wikipedia.org)
  • [4] The strength of metallic bonds for different elemental metals reaches a maximum around the center of the transition metal series, as these elements have large numbers of delocalized electrons. (wikipedia.org)
  • In case the name is new to you, Mountain Pass-located in San Bernardino County, California-is the only rare earth mining and processing plant in the U.S. Up until the 1980s, it was also the world's leading supplier of obscure yet important metals ranging from cerium to lanthanum to europium. (forbes.com)
  • Metal mines were the smallest mining sector, 1 comprising 1.9% of all mining operations. (cdc.gov)
  • Gold mines comprised 43.1% (n = 121) of all metal mining operations. (cdc.gov)
  • Juan Carlos Artigas, investment research manager at the World Gold Council, a gold-mining trade group headquartered in London, argues that a dearth of new gold discoveries, buying by central banks, and demand from China and India suggest that the metal has more room to run. (kiplinger.com)
  • We stand at a time of unprecedented change, and the mining and metals industry is not immune to that. (ey.com)
  • In response, mining and metals companies will need to automate aspects of their tax compliance functions to meet the increasing demands for data disclosure. (ey.com)
  • For mining and metals companies around the world, digital is impacting all aspects of their business. (ey.com)
  • SLV ) thus far distinguishes this correction from prior selloffs where mining equities had tended to fall farther and faster than prices for the underlying metal. (aol.com)
  • Glassdoor has employee reviews from 5,000 Mining & Metals employees. (glassdoor.com)
  • Since a brief trough in February, metal prices have staged a strong rally, taking prices up by 22pc-50pc," notes Daniel Kang, HSBC's head of mining in the Asia Pacific Region. (telegraph.co.uk)
  • Valuations for metals are starting to look pretty full right now but this is not the case with mining shares, which appear to still offer good value. (telegraph.co.uk)
  • Subscribe to our Metals & Mining E-Alert. (bcg.com)
  • Salts of abundant and relatively nontoxic metals are discussed in the Ionic Strength module. (epa.gov)
  • The rate and extent of this process is dependent upon the temperature and chemical characteristics of the wastewater, such as the concentration of metal initially present and other ionic species present, which can compete with or form soluble complexes with the target metal species. (encyclopedia.com)
  • Metals also form ionic bonds, the tightest form of chemical bonding. (encyclopedia.com)
  • Aluminum Substrate: High-performance painted metal roofing product, carefully tensioned leveled for superior flatness. (yudu.com)
  • The heavy metal content of coal varies by coal seam and geographic region. (sourcewatch.org)
  • ( Kitco News ) - The outlook for precious metals in the first quarter of 2016 is mixed as a number of macro forces converge. (forbes.com)
  • Protection of Metals and Physical Chemistry of Surfaces is an international peer reviewed journal that publishes articles covering all aspects of the physical chemistry of materials and interfaces in various environments. (springer.com)
  • Protection of Metals and Physical Chemistry of Surfaces is a peer reviewed journal. (springer.com)
  • The Chemistry of Transition Metals Award recognises outstanding research in any aspect of the chemistry of d- and f-block elements. (rsc.org)
  • The RSC Chemistry of Transition Metals Award was established in 1971. (rsc.org)
  • With infinite combinations of metal elements, atomicity and composition, this method will open up a new field in chemistry on a one-nanometer scale. (eurekalert.org)
  • Alkali metals reacting with water, comparing lithium Li, sodium Na and potassium K as they react with water in the presence of phenolphthalein. (youtube.com)
  • Common uses of the alkali metals include the use of lithium , sodium , and potassium as reducing agent s and in heat-transfer coolant . (everything2.com)
  • All of the alkali metals react with oxygen -- lithium and sodium to form monoxide s and the heavier alkali metals to form peroxide s. (everything2.com)
  • It's less obvious that other elements-beryllium, sodium, and lithium, for example-are metals too. (usgs.gov)
  • When most metal salts dissolved in solution are added in a pressurized oven and heated 70 to 200 degrees centigrade or warmer for four to 16 hours, uniform metal crystals form at the hydroxyl sites. (zdnet.com)
  • This method employs a dendrimer template[2] that serves as a tiny "scaffold" to enable controlled accumulation of metal salts. (eurekalert.org)
  • The metals display catalytic, electrical and optical that would not be present in larger or odd-sized crystals. (zdnet.com)
  • Both metals are used in the catalytic converters found in cars, so strong auto sales would be bullish. (kiplinger.com)
  • Information on practically all ferrous and nonferrous metals including powder metals is presented in tabular form for easy review and comparison between different materials. (worldcat.org)
  • Transactions of The Indian Institute of Metals is devoted to the publication of selected reviews on contemporary topics and original research articles that contribute to the advancement of ferrous and non-ferrous process metallurgy, materials engineering, physical, chemical and mechanical metallurgy, welding science and technology, surface engineering and characterisation, materials development, thermodynamics and kinetics, materials modelling and to other allied branches of metallurgy and materials engineering. (springer.com)
  • Fastmarkets MB, previously known as Metal Bulletin, is a specialist international publisher and information provider for the global steel, non-ferrous and scrap metals markets. (wikipedia.org)
  • The publication provided price and other information for the steel and non-ferrous metals markets and was published twice a week. (wikipedia.org)
  • An electron micrograph (TEM) of a metal, in this case platinum, deposited on cellulose, is shown on the left. (zdnet.com)
  • As it relates to silver and the platinum group metals the influence of global deflationary forces will continue to cap gains. (forbes.com)
  • A plus for platinum is a supply shortage stemming from power cuts in South Africa, the world's largest producer of the metal. (kiplinger.com)
  • Sheets of metal thicker than a few micrometres appear opaque, but gold leaf transmits green light. (wikipedia.org)
  • Although not as rare as gold, the group of 17 metals are used in the manufacture of advanced technologies, including electric vehicles, wind turbines and missile guidance systems. (forbes.com)
  • For decades, gold bugs have argued the bullish case for their favorite metal. (kiplinger.com)
  • The price of gold has climbed steadily for the past nine years, from $277 an ounce in 2001 to a record high (not adjusted for inflation) of $1,213 in December 2009 as investors piled into the yellow metal because of its reputation as a safe haven and as a hedge against a falling dollar. (kiplinger.com)
  • Despite steady gains in the price of gold, the yellow metal still has many supporters. (kiplinger.com)
  • They will complement, as well as expand, the Exchange's precious metals product slate and allow market participants in the precious metals industry, including the OTC market and ETF's, to trade referenced gold/silver ratios in a much more efficient manner. (cmegroup.com)
  • Because metals may have an irritant potential and some metals are even toxic to the human organism, it is mandatory that the utmost reservation be exercised with the testing of nonstandardized metal compounds. (springer.com)
  • The alkali metals themselves react with many organic compounds, particularly those containing an active hydrogen atom. (everything2.com)
  • Rain falling on coal storage piles and ash piles can leach out these heavy metal compounds into ground water or lakes and streams, contaminating drinking water sources. (sourcewatch.org)
  • While residential construction in the U.S. has pulled back from its peak, worldwide non-residential construction notably is expected to strengthen,' according to the steel and metals company's outlook. (marketwatch.com)
  • Although most elemental metals have higher densities than most nonmetals , [4] there is a wide variation in their densities, lithium being the least dense (0.534 g/cm 3 ) and osmium (22.59 g/cm 3 ) the most dense. (wikipedia.org)
  • Furthermore, producers are looking for alternative methods and metals to produce batteries with in order to prevent overdependence on lithium and cobalt. (yahoo.com)
  • Lithium is the lightest metal lic element. (everything2.com)
  • The alkali metals have low melting point s, ranging from a high of 181° C for lithium to a low of 28° C for cesium , which has the second lowest melting point of all the metal s. (everything2.com)
  • Alloy s of alkali metals exist that melt as low as -78° C . Cesium is the most volatile of the alkali metals, with a boiling point of 671° C . The boiling points of the alkali metals increase in regular fashion as the atomic number s decrease, the highest, 1,342° C , being that of lithium . (everything2.com)
  • The alkali metals are the least electronegative of the elements, with electronegativities ranging from 0.7 ( cesium ) to 1.0 ( lithium ). (everything2.com)
  • Of the alkali metals, only lithium reacts with nitrogen . (everything2.com)
  • Cobalt toxicity - an emerging clinical problem in patients with metal-on-metal hip prostheses? (mja.com.au)
  • We report two Australian patients with possible cobalt toxicity related to metal-on-metal total hip replacements. (mja.com.au)
  • Metal sensitivity is not the same as metal toxicity, which is due to high levels of metals in the body. (prweb.com)
  • [3] Heavy metal toxicity can result in damaged or reduced mental and central nervous function, lower energy levels, and damage to blood composition, lungs, kidneys, liver, and other vital organs. (sourcewatch.org)
  • 3. Nine work-related fatalities occurred in metal mines in 2001, compared to seven in 2000. (cdc.gov)
  • In 2001 Metal Bulletin bought American Metal Market. (wikipedia.org)
  • Alkali metals tend to lose one electron and form ions with a single positive charge. (gsu.edu)
  • We find that the metals of most concern tend to be those with three characteristics: they are available largely or entirely as byproducts, they are used in small quantities for highly specialized applications, and they possess no effective substitutes. (pnas.org)
  • The metals of most concern tend to be those available largely or entirely as byproducts, used in small quantities for highly specialized applications, and possessing no effective substitutes. (pnas.org)
  • pipeclay (or silica) triangles are intended for use with porcelain crucibles, metal crucibles tend to be larger and fit the triangles badly. (rsc.org)
  • Metals tend to be shiny, they make good conductors, and they're malleable and ductile. (usgs.gov)
  • Most common non metal lic substances such as the halogens , halogen acids, sulfur , and phosphorus react with the alkali metals. (everything2.com)
  • For example, the nonmetal iodine gradually becomes a metal at a pressure of between 40 and 170 thousand times atmospheric pressure . (wikipedia.org)
  • LBMA Trade Data is a transparency service for the precious metals market delivered by Nasdaq. (nasdaq.com)
  • He focuses on relevant economic and geopolitical topics that affect the precious metals and base metal markets. (futuresmag.com)
  • However, the deterioration of the minerals and metals markets continued, depressing global trade. (usitc.gov)
  • Additionally, China's demand-and-supply dynamics in the minerals and metals markets continue to exert a strong effect on the U.S. trade balance through global market prices. (usitc.gov)
  • These rare-earth metals, along with a selection of elements known as base and precious metals, provide today's investors and active traders with a variety of trading opportunities. (investopedia.com)
  • To be more specific, "critical minerals" here means "rare earth metals," and "foreign adversaries" means "China. (forbes.com)
  • To cope with cyclical demand, steel and metals companies need to be flexible. (bcg.com)
  • Human activities redistribute and concentrate metals in areas that are not naturally metals-enriched. (epa.gov)
  • Metal deactivators , or metal deactivating agents ( MDA ) are fuel additives and oil additives used to stabilize fluids by deactivating (usually by sequestering ) metal ions , mostly introduced by the action of naturally occurring acids in the fuel and acids generated in lubricants by oxidative processes with the metallic parts of the systems. (wikipedia.org)
  • In colder climates, snow disposal sites may act as seasonal sources for metals associated with atmospheric deposition, road use and snow management. (epa.gov)
  • Equally, some materials regarded as metals can become nonmetals. (wikipedia.org)
  • The buying came after the state body in 2012 added more metals, including some minor metals and rare earths, in its programme of stockpiling strategic materials. (reuters.com)
  • Transactions of the Indian Institute of Metals is an International Journal publishing high-quality reviews and current research papers on various apects of metallurgy and materials engineering. (springer.com)
  • Transactions of the Indian Institute of Metals also serves as a forum for rapid publication of recent advances in all the branches of Metallurgy and Materials Engineering. (springer.com)
  • Understand that smelting metal in a microwave is a non-traditional use of all materials involved in this process. (ehow.com)
  • Researchers in Japan have found a way to create innovative materials by blending metals with precision control. (eurekalert.org)
  • Multimetallic clusters -- typically composed of three or more metals -- are garnering attention as they exhibit properties that cannot be attained by single-metal materials. (eurekalert.org)
  • If a variety of metal elements are freely blended, it is expected that as-yet-unknown substances are discovered and highly-functional materials are developed. (eurekalert.org)
  • Metals Division, Office of Materials and Machinery, Manufacturing and Services Unit, International Trade Administration, U.S. Department of Commerce. (usitc.gov)
  • Metals are agents that consist of metallic poisons. (cdc.gov)
  • All members of the alkaline earth metal family have a valence electron configuration of s 2 . (encyclopedia.com)
  • The stockpiler paid around 1,400-1,450 yuan per one percent of metal contained in the 2,700 tonnes of molybdenum oxide, and around $15.70/lb for cobalt. (reuters.com)
  • Demand for cellphones and flat-screen TVs is depleting global supplies of a host of uncommon metals. (newscientist.com)
  • Allergies are not uncommon and repeated long-term contact with some metals may even cause cancer. (sourcewatch.org)
  • 0207 2412430 (also plastics and stainless steel) Forward Metals Ltd., Saxon Way, Chelmsley Wood, Birmingham, B37 5AY tel- 0121 779 4888 Dore Metal Services, 46 Imex Business Park, Flaxley Rd, Birmingham B33 9AL. (ucl.ac.uk)
  • A pioneering manufacturing process that can turn titanium, stainless steel and many other metals into a new breed of engineering components could have a big impact across industry. (zdnet.com)
  • Metals are typically malleable (they can be hammered into thin sheets) or ductile (can be drawn into wires). (wikipedia.org)
  • They are generally designed to precipitate trace metals to their solubility limits and obtain additional removal by coprecipitation and adsorption during the precipitation reaction. (encyclopedia.com)
  • Metals, as chemical elements, comprise 25% of the Earth's crust and are present in many aspects of modern life. (wikipedia.org)
  • Before going further, below are two images showing some precious metal crystals obtained with this process. (zdnet.com)
  • Through investing in some basic tools and equipment, you can create a homemade rig capable of melting most soft metals in the comfort of your home. (ehow.com)
  • NEW YORK (MarketWatch) - Commercial Metals Co. CMC, -1.37% reported second-quarter net income Tuesday of $80.1 million, or $1.29 a share, compared with $56.6 million, or 91 cents a share in the year-earlier period. (marketwatch.com)
  • With small metal droplets or thin films of an alkali metal, the reaction can be explosive. (everything2.com)
  • The checklist below will help you identify key data and information useful for determining whether to include metals among your candidate causes. (epa.gov)