Silicates: The generic term for salts derived from silica or the silicic acids. They contain silicon, oxygen, and one or more metals, and may contain hydrogen. (From McGraw-Hill Dictionary of Scientific and Technical Terms, 4th Ed)Magnesium Silicates: A generic term for a variety of compounds that contain silicon, oxygen, and magnesium, and may contain hydrogen. Examples include TALC and some kinds of ASBESTOS.Silicate Cement: A relatively hard, translucent, restorative material used primarily in anterior teeth. (From Boucher's Clinical Dental Terminology, 4th ed, p50)Aluminum Silicates: Any of the numerous types of clay which contain varying proportions of Al2O3 and SiO2. They are made synthetically by heating aluminum fluoride at 1000-2000 degrees C with silica and water vapor. (From Hawley's Condensed Chemical Dictionary, 11th ed)Calcium Compounds: Inorganic compounds that contain calcium as an integral part of the molecule.Silicic Acid: A hydrated form of silicon dioxide. It is commonly used in the manufacture of TOOTHPASTES and as a stationary phase for CHROMATOGRAPHY.Magnesium Compounds: Inorganic compounds that contain magnesium as an integral part of the molecule.Cosmic Dust: Finely divided solid matter with particle sizes smaller than a micrometeorite, thus with diameters much smaller than a millimeter, moving in interplanetary space. (NASA Thesaurus, 1994)Meteoroids: Any solid objects moving in interplanetary space that are smaller than a planet or asteroid but larger than a molecule. Meteorites are any meteoroid that has fallen to a planetary surface. (From McGraw-Hill Dictionary of Scientific and Technical Terms, 4th ed)Chemical Processes: The reactions and interactions of atoms and molecules, the changes in their structure and composition, and associated energy changes.Astronomy: The science concerned with celestial bodies and the observation and interpretation of the radiation received in the vicinity of the earth from the component parts of the universe (McGraw Hill Dictionary of Scientific and Technical Terms, 5th ed)Solar System: The group of celestial bodies, including the EARTH, orbiting around and gravitationally bound by the sun. It includes eight planets, one minor planet, and 34 natural satellites, more than 1,000 observed comets, and thousands of lesser bodies known as MINOR PLANETS (asteroids) and METEOROIDS. (From Academic American Encyclopedia, 1983)Astronomical Phenomena: Aggregates of matter in outer space, such as stars, planets, comets, etc. and the properties and processes they undergo.Silicon: A trace element that constitutes about 27.6% of the earth's crust in the form of SILICON DIOXIDE. It does not occur free in nature. Silicon has the atomic symbol Si, atomic number 14, and atomic weight [28.084; 28.086].Silicon Dioxide: Transparent, tasteless crystals found in nature as agate, amethyst, chalcedony, cristobalite, flint, sand, QUARTZ, and tridymite. The compound is insoluble in water or acids except hydrofluoric acid.Iron Compounds: Organic and inorganic compounds that contain iron as an integral part of the molecule.Extraterrestrial Environment: The environment outside the earth or its atmosphere. The environment may refer to a closed cabin (such as a space shuttle or space station) or to space itself, the moon, or other planets.Evolution, Planetary: Creation and development of bodies within solar systems, includes study of early planetary geology.Carbon Sequestration: Any of several processes for the permanent or long-term artificial or natural capture or removal and storage of carbon dioxide and other forms of carbon, through biological, chemical or physical processes, in a manner that prevents it from being released into the atmosphere.Spacecraft: Devices, manned and unmanned, which are designed to be placed into an orbit about the Earth or into a trajectory to another celestial body. (NASA Thesaurus, 1988)Jupiter: The fifth planet in order from the sun. It is one of the five outer planets of the solar system. Its sixteen natural satellites include Callisto, Europa, Ganymede, and Io.Aluminum Compounds: Inorganic compounds that contain aluminum as an integral part of the molecule.Dental Waste: Any waste product generated by a dental office, surgery, clinic, or laboratory including amalgams, saliva, and rinse water.Diatomaceous Earth: A form of SILICON DIOXIDE composed of skeletons of prehistoric aquatic plants which is used for its ABSORPTION quality, taking up 1.5-4 times its weight in water. The microscopic sharp edges are useful for insect control but can also be an inhalation hazard. It has been used in baked goods and animal feed. Kieselguhr is German for flint + earthy sediment.Bentonite: A colloidal, hydrated aluminum silicate that swells 12 times its dry size when added to water.Planets: Celestial bodies orbiting around the sun or other stars.Silicone Gels: Synthetic organosiloxane gels that are formed from synthetic polymers of silicone oxide with organic sidechains (polydimethylsiloxane) by lengthening the polymer chains. Unlike silicone elastomers, they are not treated with amorphous silica. They are used as fillers in breast implants.Breast Implants: Implants used to reconstruct and/or cosmetically enhance the female breast. They have an outer shell or envelope of silicone elastomer and are filled with either saline or silicone gel. The outer shell may be either smooth or textured.Electrolysis: Destruction by passage of a galvanic electric current, as in disintegration of a chemical compound in solution.Aluminum: A metallic element that has the atomic number 13, atomic symbol Al, and atomic weight 26.98.Ceramics: Products made by baking or firing nonmetallic minerals (clay and similar materials). In making dental restorations or parts of restorations the material is fused porcelain. (From McGraw-Hill Dictionary of Scientific and Technical Terms, 4th ed & Boucher's Clinical Dental Terminology, 4th ed)Volcanic Eruptions: The ash, dust, gases, and lava released by volcanic explosion. The gases are volatile matter composed principally of about 90% water vapor, and carbon dioxide, sulfur dioxide, hydrogen, carbon monoxide, and nitrogen. The ash or dust is pyroclastic ejecta and lava is molten extrusive material consisting mainly of magnesium silicate. (From McGraw-Hill Dictionary of Scientific and Technical Terms, 4th ed)Adsorption: The adhesion of gases, liquids, or dissolved solids onto a surface. It includes adsorptive phenomena of bacteria and viruses onto surfaces as well. ABSORPTION into the substance may follow but not necessarily.Germanium: A rare metal element with a blue-gray appearance and atomic symbol Ge, atomic number 32, and atomic weight 72.63.Calcium Sulfate: A calcium salt that is used for a variety of purposes including: building materials, as a desiccant, in dentistry as an impression material, cast, or die, and in medicine for immobilizing casts and as a tablet excipient. It exists in various forms and states of hydration. Plaster of Paris is a mixture of powdered and heat-treated gypsum.Mars: The fourth planet in order from the sun. Its two natural satellites are Deimos and Phobos. It is one of the four inner or terrestrial planets of the solar system.Green Chemistry Technology: Pollution prevention through the design of effective chemical products that have low or no toxicity and use of chemical processes that reduce or eliminate the use and generation of hazardous substances.Minerals: Native, inorganic or fossilized organic substances having a definite chemical composition and formed by inorganic reactions. They may occur as individual crystals or may be disseminated in some other mineral or rock. (Grant & Hackh's Chemical Dictionary, 5th ed; McGraw-Hill Dictionary of Scientific and Technical Terms, 4th ed)GlyceraldehydeAdministration, Buccal: Administration of a soluble dosage form between the cheek and gingiva. It may involve direct application of a drug onto the buccal mucosa, as by painting or spraying.TetrosesSilanes: Compounds similar to hydrocarbons in which a tetravalent silicon atom replaces the carbon atom. They are very reactive, ignite in air, and form useful derivatives.Oxygen Isotopes: Stable oxygen atoms that have the same atomic number as the element oxygen, but differ in atomic weight. O-17 and 18 are stable oxygen isotopes.Dental Cements: Substances used to bond COMPOSITE RESINS to DENTAL ENAMEL and DENTIN. These bonding or luting agents are used in restorative dentistry, ROOT CANAL THERAPY; PROSTHODONTICS; and ORTHODONTICS.Powders: Substances made up of an aggregation of small particles, as that obtained by grinding or trituration of a solid drug. In pharmacy it is a form in which substances are administered. (From Dorland, 28th ed)Mineral Fibers: Long, pliable, cohesive natural or manufactured filaments of various lengths. They form the structure of some minerals. The medical significance lies in their potential ability to cause various types of PNEUMOCONIOSIS (e.g., ASBESTOSIS) after occupational or environmental exposure. (From McGraw-Hill Dictionary of Scientific and Technical Terms, 4th ed, p708)Moon: The natural satellite of the planet Earth. It includes the lunar cycles or phases, the lunar month, lunar landscapes, geography, and soil.Thermogravimetry: Technique whereby the weight of a sample can be followed over a period of time while its temperature is being changed (usually increased at a constant rate).Dental Casting Investment: Material from which the casting mold is made in the fabrication of gold or cobalt-chromium castings. (Boucher's Clinical Dental Terminology, 4th ed, p168)Materials Testing: 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.Glass: Hard, amorphous, brittle, inorganic, usually transparent, polymerous silicate of basic oxides, usually potassium or sodium. It is used in the form of hard sheets, vessels, tubing, fibers, ceramics, beads, etc.Carbonates: Salts or ions of the theoretical carbonic acid, containing the radical CO2(3-). Carbonates are readily decomposed by acids. The carbonates of the alkali metals are water-soluble; all others are insoluble. (From Grant & Hackh's Chemical Dictionary, 5th ed)

Biochemical evolution III: polymerization on organophilic silica-rich surfaces, crystal-chemical modeling, formation of first cells, and geological clues. (1/442)

Catalysis at organophilic silica-rich surfaces of zeolites and feldspars might generate replicating biopolymers from simple chemicals supplied by meteorites, volcanic gases, and other geological sources. Crystal-chemical modeling yielded packings for amino acids neatly encapsulated in 10-ring channels of the molecular sieve silicalite-ZSM-5-(mutinaite). Calculation of binding and activation energies for catalytic assembly into polymers is progressing for a chemical composition with one catalytic Al-OH site per 25 neutral Si tetrahedral sites. Internal channel intersections and external terminations provide special stereochemical features suitable for complex organic species. Polymer migration along nano/micrometer channels of ancient weathered feldspars, plus exploitation of phosphorus and various transition metals in entrapped apatite and other microminerals, might have generated complexes of replicating catalytic biomolecules, leading to primitive cellular organisms. The first cell wall might have been an internal mineral surface, from which the cell developed a protective biological cap emerging into a nutrient-rich "soup." Ultimately, the biological cap might have expanded into a complete cell wall, allowing mobility and colonization of energy-rich challenging environments. Electron microscopy of honeycomb channels inside weathered feldspars of the Shap granite (northwest England) has revealed modern bacteria, perhaps indicative of Archean ones. All known early rocks were metamorphosed too highly during geologic time to permit simple survival of large-pore zeolites, honeycombed feldspar, and encapsulated species. Possible microscopic clues to the proposed mineral adsorbents/catalysts are discussed for planning of systematic study of black cherts from weakly metamorphosed Archaean sediments.  (+info)

A role for the mannose-sensitive hemagglutinin in biofilm formation by Vibrio cholerae El Tor. (2/442)

While much has been learned regarding the genetic basis of host-pathogen interactions, less is known about the molecular basis of a pathogen's survival in the environment. Biofilm formation on abiotic surfaces represents a survival strategy utilized by many microbes. Here it is shown that Vibrio cholerae El Tor does not use the virulence-associated toxin-coregulated pilus to form biofilms on borosilicate but rather uses the mannose-sensitive hemagglutinin (MSHA) pilus, which plays no role in pathogenicity. In contrast, attachment of V. cholerae to chitin is shown to be independent of the MSHA pilus, suggesting divergent pathways for biofilm formation on nutritive and nonnutritive abiotic surfaces.  (+info)

Origin of graphitic carbon and pentlandite in matrix olivines in the Allende meteorite. (3/442)

Matrix olivines in the Allende carbonaceous chondrite are believed to have formed by condensation processes in the primitive solar nebula. However, transmission electron microscope observations of numerous matrix olivines show that they contain abundant, previously unrecognized, nanometer-sized inclusions of pentlandite and poorly graphitized carbon. Neither of these phases would have been stable at the high-temperature conditions required to condense iron-rich olivine in the solar nebula. The presence of these inclusions is consistent with formation of the olivines by parent body processes that involved overgrowth of fine-grained organic materials and sulfides in the precursor matrix materials.  (+info)

Stable five- and six-coordinated silicate anions in aqueous solution. (4/442)

Addition of aliphatic polyols to aqueous silicate solutions is shown to yield high concentrations of stable polyolate complexes containing five- or six-coordinated silicon. Coordinating polyols require at least four hydroxy groups, two of which must be in threo configuration, and coordinate to silicon via hydroxy oxygens at chain positions on either side of the threo pair. The remarkable ease by which these simple sugar-like molecules react to form hypervalent silicon complexes in aqueous solution supports a long-standing supposition that such species play a significant role in the biological uptake and transport of silicon and in mineral diagenesis.  (+info)

An infrared spectral match between GEMS and interstellar grains. (5/442)

Infrared spectral properties of silicate grains in interplanetary dust particles (IDPs) were compared with those of astronomical silicates. The approximately 10-micrometer silicon-oxygen stretch bands of IDPs containing enstatite (MgSiO3), forsterite (Mg2SiO4), and glass with embedded metal and sulfides (GEMS) exhibit fine structure and bandwidths similar to those of solar system comets and some pre-main sequence Herbig Ae/Be stars. Some GEMS exhibit a broad, featureless silicon-oxygen stretch band similar to those observed in interstellar molecular clouds and young stellar objects. These GEMS provide a spectral match to astronomical "amorphous" silicates, one of the fundamental building blocks from which the solar system is presumed to have formed.  (+info)

Windows through the dusty disks surrounding the youngest low-mass protostellar objects. (6/442)

The formation and evolution of young low-mass stars are characterized by important processes of mass loss and accretion occurring in the innermost regions of their placentary circumstellar disks. Because of the large obscuration of these disks at optical and infrared wavelengths in the early protostellar stages (class 0 sources), they were previously detected only at radio wavelengths using interferometric techniques. We have detected with the Infrared Space Observatory the mid-infrared (mid-IR) emission associated with the class 0 protostar VLA1 in the HH1-HH2 region located in the Orion nebula. The emission arises in three wavelength windows (at 5. 3, 6.6, and 7.5 micrometers) where the absorption due to ices and silicates has a local minimum that exposes the central part of the young protostellar system to mid-IR investigations. The mid-IR emission arises from a central source with a diameter of 4 astronomical units at an averaged temperature of approximately 700 K, deeply embedded in a dense region with a visual extinction of 80 to 100 magnitudes.  (+info)

Age of Neoproterozoic bilatarian body and trace fossils, White Sea, Russia: implications for metazoan evolution. (7/442)

A uranium-lead zircon age for a volcanic ash interstratified with fossil-bearing, shallow marine siliciclastic rocks in the Zimnie Gory section of the White Sea region indicates that a diverse assemblage of body and trace fossils occurred before 555.3 +/- 0.3 million years ago. This age is a minimum for the oldest well-documented triploblastic bilaterian Kimberella. It also makes co-occurring trace fossils the oldest that are reliably dated. This determination of age implies that there is no simple relation between Ediacaran diversity and the carbon isotopic composition of Neoproterozoic seawater.  (+info)

Porous apatite-wollastonite glass-ceramic as an intramedullary plug. (8/442)

We evaluated the efficacy and biocompatibility of porous apatite-wollastonite glass ceramic (AW-GC) as an intramedullary plug in total hip replacement (THR) for up to two years in 22 adult beagle dogs. Cylindrical porous AW-GC rods (70% porosity, mean pore size 200 microm) were prepared. Four dogs were killed at 1, 3, 6 and 12 months each and six at 24 months after implantation. Radiological evaluation confirmed the efficacy of porous AW-CG as an intramedullary plug. Histological evaluation showed osteoconduction at one month and resorption of the porous AW-GC, which was replaced by newly-formed bone, at 24 months. Our findings indicate that porous AW-GC can be used clinically as an intramedullary plug in THR.  (+info)

  • ຊື່ຜະລິດຕະພັນ Ethyl Silicate ຄໍາສັບຄ້າຍຄື tetraethyl silicate CAS NO. 78-10-4 ຄຸນລັກສະນະຂອງດັດສະນີຄຸນນະພາບຊັ້ນຮຽນ -40 ຮູບລັກສະນະລະດັບ Grade-32 ຮູບລັກສະນະ 28-28 ຮູບຮ່າງສີແຫຼວໂປ່ງໃສ (APHA) 30 ຄວາມ ໜາ ແໜ້ນ ສູງສຸດ 20 ° C (68 ° F) 1.05-1.07 0.97-1.0 0.934-0.936 ເນື້ອຊິລິກາໂດຍ w. (
  • We present a detailed investigation of different compositions of Yb3 + -doped alumino-silicate glasses as promising materials for diode-pumped high-power laser applications at 1030 nm due to their beneficial thermo-mechanical properties. (
  • Metal matrix composites were made by high-pressure infiltration casting (HiPIC) of aluminum alloy A356 into alumino-silicate rigidized fiber preforms. (
  • The Calcium Silicate Board is mainly used Calcium and silicate as basic material, reinforced by nature fiber, and tested in the high temperature and high pressure. (
  • The competitive advantages of calcium silicate board are environmental protection, durability, high intensity, long life, waterproof and moisture proof, which make the calcium silicate board better than the gypsum board. (
  • Nowadays, calcium silicate board has become an important ideal building material in modern construction. (
  • With prominent characteristics such as water absorption, fire resistant, sound insulation, and thermal insulation, the Calcium Silicate DURAflex board has proven itself to be highly suitable for the warmth, humidity and heavy rainfall of Vietnam, and has therefore gradually become a popular construction material. (
  • This product can be widely used as building interior wall、suspended ceiling and acoustic panel of gyp/theater/meeting room after sawed、drilled、nailed、planed etcs process and calcium silicate board surface decoration processing.Calcium silicate board also can combine other materials and then change into kinds of fireproof、sound insulation 、Energy saving tub surround. (
  • calcium silicate board equipment main raw materialMain raw material:Reinforced fiber (pulp, wollastonite, glass fiber, mica, chrysotile and so on. (
  • WINS H-Tec Fire Protection Panel (FPP) is a superior autoclaved calcium silicate panel, having excellent fire resistant properties and offering incredible acoustic performance. (
  • In present work acid resistant calcium silicate has been synthesized from silica of rice husk and calcium oxide of analytical grade. (
  • The silica from rice husk was extracted at 550oC in amorphous form and then allowed to react with calcium oxide in the presence of excess water by Sol-Gel technique to obtain calcium silicate hydrate gels. (
  • The molar ratios of Si/Ca were adjusted each time to obtain silica rich calcium silicate hydrates. (
  • The gels were dried in oven and calcined in muffle furnace at various temperatures to obtain acid resistant calcium silicate. (
  • Studies show that at higher molar ratio of Si/Ca, the heat treatment improves the acid resistivity of calcium silicate whereas at lower molar ratios the heat treatment does not make it acid resistant. (
  • Mansha, S. Javed, M. Kazmi and N. Feroze, "Study of Rice Husk Ash as Potential Source of Acid Resistance Calcium Silicate," Advances in Chemical Engineering and Science , Vol. 1 No. 3, 2011, pp. 147-153. (
  • S. Tsunematsu, H. Yamada, E. Abe and K. Inoue, "Method for Preparation of Acid Resistant Calcium Silicate," US Patent No. 5750038, 1998. (
  • A. Meiszterics and K. Sinko, "Sol-Gel Derived Calcium Silicate Ceramics," Colloids and Surfaces A, Vol. 319, No. 1-3, 2008, pp. 143-148. (
  • Tangible Benefits Environmental Kaolin,,Medium stone circular vibrating screen in vinnitsa ukraine europe small calcining ore circular vibrating screen in zaria nigeria africa new pyrrhotite circular vibrating screen in mexico north america small gold mine circular vibrating screen in marseille france europe medium silicate circular vibrating screen in amman jordan west asia. (
  • We are,a loss in central asia kormohigh end dust catchersellat a loss in central asia kormoHigh end large cobblestone circular vibrating screen forhighend ferrosilicon dust catchersellat a lossinmonterrey mexico north americain the second quarter of 2018 we closed our leased,Yogyakarta efficient medium silicate pellet machine for sale,Yogyakarta efficient medium silicate pellet machine for sale. (
  • Zirconium ore best.Zirconium, symbol zr on the periodic table, is a metal most often found in and extracted from the silicate mineral zirconium silicate and the oxide mineral baddeleyite.Chat online zirconium ore crusher research paper 4086 words.Zirconium ore crusher zirconium is a chemical element with the symbol zr, atomic number 40 and. (
  • Zirconium silicate primary mobile crusher.Zirconium silie process plant in nigeria magazene.Zirconium silie process plant in india rock crusher zirconium silie process plant in india from the silie mineral zirconium silie and the and crusher, kaolin ore crushing solutions kaolin is a clay mineral it is a stacked up silie layer with one, kaolin crusher can, marble, basalt, bauxite. (
  • Herein, we developed a template method for the synthesis of amorphous cobalt silicate nanobelts which can be coated with carbon through the deposition and thermal decomposition of phenol formaldehyde resin. (
  • Tested as an anode material, the amorphous cobalt silicate [email protected] composites exhibit a reversible high capacity of 745 mA h g −1 at a current density of 100 mA g −1 , and a long life span of up to 1000 cycles with a stable capacity retention of 480 mA h g −1 at a current density of 500 mA g −1 . (
  • By heating an amorphous iron oxide produced by Leptothrix ochracea, an iron-oxidizing bacterium species, at 600-1100°C in air for 2 h, vivid red-colored powdered materials including α-Fe 2 O 3 (hematite) and amorphous silicate with high thermostability were prepared which offer potential for use as overglaze enamels on porcelain. (
  • The particles are covered with amorphous silicate phase ∼5 nm in thickness and are intricately interconnected into microtubules with an average diameter of 1.26 μm. (
  • The attractive color of this material is due to the following structural features: small particle size (∼40 nm), nanocomposite of hematite and amorphous silicate, and a microtubule structure that inhibits aggregation of individual hematite particles and microtubules. (
  • Global Silicate Materials Market 2020: This Report provides highlighting opportunities, and supporting strategic and tactical decision-making. (
  • The report also presents forecasts for Global Silicate Materials Market investments from 2020 till 2026. (
  • The section exhibits numerous large, well-defined chondrules (up to 2 mm) in a black matrix of fine-grained silicates, metal and troilite. (
  • Optical and scanning electron microscopy were used to examine the composite microstructure for porosity, unfiberized alumina-silicate inclusions (shot), preform compression and fiber clumping, fracture and connectivity of the reinforcement. (
  • The corporate upholds the philosophy of "Be No.1 in excellent, be rooted on credit rating and trustworthiness for growth", will keep on to serve outdated and new clients from home and abroad whole-heatedly for silicate rocks We have been on the lookout ahead to setting up long-term small business associations with you. (
  • Silicate weathering provides essential negative feedback to the carbonate-silicate cycle (carbon cycle) to maintain temperate climates on Earth and possibly on Earth-sized temperate exoplanets. (