Organic Chemicals: A broad class of substances containing carbon and its derivatives. Many of these chemicals will frequently contain hydrogen with or without oxygen, nitrogen, sulfur, phosphorus, and other elements. They exist in either carbon chain or carbon ring form.Water Pollutants, Chemical: Chemical compounds which pollute the water of rivers, streams, lakes, the sea, reservoirs, or other bodies of water.Chemistry, Organic: The study of the structure, preparation, properties, and reactions of carbon compounds. (McGraw-Hill Dictionary of Scientific and Technical Terms, 6th ed)Soil Pollutants: Substances which pollute the soil. Use for soil pollutants in general or for which there is no specific heading.Biodegradation, Environmental: Elimination of ENVIRONMENTAL POLLUTANTS; PESTICIDES and other waste using living organisms, usually involving intervention of environmental or sanitation engineers.Environmental Pollutants: 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.Polychlorinated Biphenyls: Industrial products consisting of a mixture of chlorinated biphenyl congeners and isomers. These compounds are highly lipophilic and tend to accumulate in fat stores of animals. Many of these compounds are considered toxic and potential environmental pollutants.Environmental Monitoring: 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.Water Microbiology: The presence of bacteria, viruses, and fungi in water. This term is not restricted to pathogenic organisms.Environmental Exposure: The exposure to potentially harmful chemical, physical, or biological agents in the environment or to environmental factors that may include ionizing radiation, pathogenic organisms, or toxic chemicals.Models, Chemical: Theoretical representations that simulate the behavior or activity of chemical processes or phenomena; includes the use of mathematical equations, computers, and other electronic equipment.Chemical Phenomena: The composition, conformation, and properties of atoms and molecules, and their reaction and interaction processes.Multiple Chemical Sensitivity: An acquired disorder characterized by recurrent symptoms, referable to multiple organ systems, occurring in response to demonstrable exposure to many chemically unrelated compounds at doses below those established in the general population to cause harmful effects. (Cullen MR. The worker with multiple chemical sensitivities: an overview. Occup Med 1987;2(4):655-61)Volatile Organic Compounds: Organic compounds that have a relatively high VAPOR PRESSURE at room temperature.Volatilization: A phase transition from liquid state to gas state, which is affected by Raoult's law. It can be accomplished by fractional distillation.Magnetic Resonance Spectroscopy: 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).Models, Biological: Theoretical representations that simulate the behavior or activity of biological processes or diseases. For disease models in living animals, DISEASE MODELS, ANIMAL is available. Biological models include the use of mathematical equations, computers, and other electronic equipment.History, 19th Century: Time period from 1801 through 1900 of the common era.Molecular Structure: 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.Particle Size: Relating to the size of solids.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)Transistors, Electronic: Electrical devices that are composed of semiconductor material, with at least three connections to an external electronic circuit. They are used to amplify electrical signals, detect signals, or as switches.Newspapers: Publications printed and distributed daily, weekly, or at some other regular and usually short interval, containing news, articles of opinion (as editorials and letters), features, advertising, and announcements of current interest. (Webster's 3d ed)Nanotechnology: The development and use of techniques to study physical phenomena and construct structures in the nanoscale size range or smaller.Biosensing Techniques: Any of a variety of procedures which use biomolecular probes to measure the presence or concentration of biological molecules, biological structures, microorganisms, etc., by translating a biochemical interaction at the probe surface into a quantifiable physical signal.Mass Media: Instruments or technological means of communication that reach large numbers of people with a common message: press, radio, television, etc.Nanowires: Nanometer-scale wires made of materials that conduct electricity. They can be coated with molecules such as antibodies that will bind to proteins and other substances.Graphite: An allotropic form of carbon that is used in pencils, as a lubricant, and in matches and explosives. It is obtained by mining and its dust can cause lung irritation.Blogging: Using an INTERNET based personal journal which may consist of reflections, comments, and often hyperlinks.Encyclopedias as Topic: Works containing information articles on subjects in every field of knowledge, usually arranged in alphabetical order, or a similar work limited to a special field or subject. (From The ALA Glossary of Library and Information Science, 1983)Animal Communication: Communication between animals involving the giving off by one individual of some chemical or physical signal, that, on being received by another, influences its behavior.Physical Therapy Specialty: The auxiliary health profession which makes use of PHYSICAL THERAPY MODALITIES to prevent, correct, and alleviate movement dysfunction of anatomic or physiological origin.Sex Attractants: Pheromones that elicit sexual attraction or mating behavior usually in members of the opposite sex in the same species.Fruit: The fleshy or dry ripened ovary of a plant, enclosing the seed or seeds.Prunus: A plant genus in the family ROSACEAE, order Rosales, subclass Rosidae. It is best known as a source of edible fruits such as apricot, plum, peach, cherry, and almond.Trees: Woody, usually tall, perennial higher plants (Angiosperms, Gymnosperms, and some Pterophyta) having usually a main stem and numerous branches.Malus: A plant genus in the family ROSACEAE, order Rosales, subclass Rosidae. It is best known as a source of the edible fruit (apple) and is cultivated in temperate climates worldwide.Litchi: A plant genus of the family SAPINDACEAE that bears sweet fruits. Unusual fatty acids such as cyclopropanoic fatty acids have been identified in the seeds.Anacardiaceae: The sumac plant family in the order Sapindales, subclass Rosidae, class Magnoliopsida. They are tropical and subtropical trees, shrubs, and woody vines that have resin ducts in the bark. The sap of many of the species is irritating to the skin.Sulfides: Chemical groups containing the covalent sulfur bonds -S-. The sulfur atom can be bound to inorganic or organic moieties.Allyl CompoundsTransition Elements: Elements with partially filled d orbitals. They constitute groups 3-12 of the periodic table of elements.Sulfur Compounds: Inorganic or organic compounds that contain sulfur as an integral part of the molecule.Garlic: One of the Liliaceae used as a spice (SPICES) and traditional remedy. It contains alliin lyase and alliin, which is converted by alliin lyase to allicin, the pungent ingredient responsible for the aroma of fresh cut garlic.San FranciscoHazardous Substances: Elements, compounds, mixtures, or solutions that are considered severely harmful to human health and the environment. They include substances that are toxic, corrosive, flammable, or explosive.Speech: Communication through a system of conventional vocal symbols.Truth Disclosure: Truthful revelation of information, specifically when the information disclosed is likely to be psychologically painful ("bad news") to the recipient (e.g., revelation to a patient or a patient's family of the patient's DIAGNOSIS or PROGNOSIS) or embarrassing to the teller (e.g., revelation of medical errors).Pesticide Residues: Pesticides or their breakdown products remaining in the environment following their normal use or accidental contamination.Organic Chemistry Phenomena: The conformation, properties, reaction processes, and the properties of the reactions of carbon compounds.Evolution, Chemical: Chemical and physical transformation of the biogenic elements from their nucleosynthesis in stars to their incorporation and subsequent modification in planetary bodies and terrestrial biochemistry. It includes the mechanism of incorporation of biogenic elements into complex molecules and molecular systems, leading up to the origin of life.Organic Chemistry Processes: The reactions, changes in structure and composition, the properties of the reactions of carbon compounds, and the associated energy changes.Biochemistry: The study of the composition, chemical structures, and chemical reactions of living things.Physiology: The biological science concerned with the life-supporting properties, functions, and processes of living organisms or their parts.

Organ-selective homing defines engraftment kinetics of murine hematopoietic stem cells and is compromised by Ex vivo expansion. (1/1961)

Hematopoietic reconstitution of ablated recipients requires that intravenously (IV) transplanted stem and progenitor cells "home" to organs that support their proliferation and differentiation. To examine the possible relationship between homing properties and subsequent engraftment potential, murine bone marrow (BM) cells were labeled with fluorescent PKH26 dye and injected into lethally irradiated hosts. PKH26(+) cells homing to marrow or spleen were then isolated by fluorescence-activated cell sorting and assayed for in vitro colony-forming cells (CFCs). Progenitors accumulated rapidly in the spleen, but declined to only 6% of input numbers after 24 hours. Although egress from this organ was accompanied by a simultaneous accumulation of CFCs in the BM (plateauing at 6% to 8% of input after 3 hours), spleen cells remained enriched in donor CFCs compared with marrow during this time. To determine whether this differential homing of clonogenic cells to the marrow and spleen influenced their contribution to short-term or long-term hematopoiesis in vivo, PKH26(+) cells were sorted from each organ 3 hours after transplantation and injected into lethally irradiated Ly-5 congenic mice. Cells that had homed initially to the spleen regenerated circulating leukocytes (20% of normal counts) approximately 2 weeks faster than cells that had homed to the marrow, or PKH26-labeled cells that had not been selected by a prior homing step. Both primary (17 weeks) and secondary (10 weeks) recipients of "spleen-homed" cells also contained approximately 50% higher numbers of CFCs per femur than recipients of "BM-homed" cells. To examine whether progenitor homing was altered upon ex vivo expansion, highly enriched Sca-1(+)c-kit+Lin- cells were cultured for 9 days in serum-free medium containing interleukin (IL)-6, IL-11, granulocyte colony-stimulating factor, stem cell factor, flk-2/flt3 ligand, and thrombopoietin. Expanded cells were then stained with PKH26 and assayed as above. Strikingly, CFCs generated in vitro exhibited a 10-fold reduction in homing capacity compared with fresh progenitors. These studies demonstrate that clonogenic cells with differential homing properties contribute variably to early and late hematopoiesis in vivo. The dramatic decline in the homing capacity of progenitors generated in vitro underscores critical qualitative changes that may compromise their biologic function and potential clinical utility, despite their efficient numerical expansion.  (+info)

Quantitative structure-activity relationships for nasal pungency thresholds of volatile organic compounds. (2/1961)

A model was developed for describing the triggering of nasal pungency in humans, based on the partition of volatile organic compounds (VOCs) between the air phase and the biophase. Two partition parameters are used in the model: the water-air partition coefficient and the octanol-water partition coefficient. The model was validated using data from the literature, principally on alcohols, acetates and ketones. The model suggests that all test compounds, regardless of their chemical functional groups, bind to a common receptor site within the hydrophobic interior of the bilayer membrane of the trigeminal nerve endings. There is probably only a slight, non-specific interaction between the VOC molecule and the receptor molecule, whereas this type of non-specific interaction for the detection of odor is much stronger. In practical terms, the suggestion that all VOCs share a common irritation receptor site implies that nasal-pungency thresholds of individual VOCs may be additive. Quantitative structure-activity relationships (QSARs) for nasal-pungency thresholds were also developed from the model, which can be used to predict nasal-pungency thresholds of common VOCs. Although the present model does not offer additional precision over that of M.H. Abraham et al., 1996, Fundam. Appl. Toxicol. 31, 71-76, it requires fewer descriptors and offers a physiological basis to the QSAR. Another advantage of the present model is that it also provides a basis for comparison between the olfactory process and nasal pungency.  (+info)

Combination of fluorescent in situ hybridization and microautoradiography-a new tool for structure-function analyses in microbial ecology. (3/1961)

A new microscopic method for simultaneously determining in situ the identities, activities, and specific substrate uptake profiles of individual bacterial cells within complex microbial communities was developed by combining fluorescent in situ hybridization (FISH) performed with rRNA-targeted oligonucleotide probes and microautoradiography. This method was evaluated by using defined artificial mixtures of Escherichia coli and Herpetosiphon aurantiacus under aerobic incubation conditions with added [3H]glucose. Subsequently, we were able to demonstrate the potential of this method by visualizing the uptake of organic and inorganic radiolabeled substrates ([14C]acetate, [14C]butyrate, [14C]bicarbonate, and 33Pi) in probe-defined populations from complex activated sludge microbial communities by using aerobic incubation conditions and anaerobic incubation conditions (with and without nitrate). For both defined cell mixtures and activated sludge, the method proved to be useful for simultaneous identification and analysis of the uptake of labeled substrates under the different experimental conditions used. Optimal results were obtained when fluorescently labeled oligonucleotides were applied prior to the microautoradiographic developing procedure. For single-cell resolution of FISH and microautoradiographic signals within activated sludge flocs, cryosectioned sample material was examined with a confocal laser scanning microscope. The combination of in situ rRNA hybridization techniques, cryosectioning, microautoradiography, and confocal laser scanning microscopy provides a unique opportunity for obtaining cultivation-independent insights into the structure and function of bacterial communities.  (+info)

Effects of pyrogallol, hydroquinone and duroquinone on responses to nitrergic nerve stimulation and NO in the rat anococcygeus muscle. (4/1961)

1. The hypothesis that endogenous superoxide dismutase (SOD) protects the nitrergic transmitter from inactivation by superoxide and that this explains the lack of sensitivity of the transmitter to superoxide generators was tested in the rat isolated anococcygeus muscle. 2. Responses to nitrergic nerve stimulation or to NO were not significantly affected by exogenous SOD or by the Cu/Zn SOD inhibitor diethyldithiocarbamic acid (DETCA). 3. Hydroquinone produced a concentration-dependent reduction of responses to NO with an IC50 of 27 microM, and higher concentrations reduced relaxant responses to nitrergic nerve stimulation with an IC50 of 612 microM. The effects of hydroquinone were only slightly reversed by SOD, so it does not appear to be acting as a superoxide generator. 4. Pyrogallol produced a concentration-dependent reduction in responses to NO with an IC50 value of 39 microM and this effect was reversed by SOD (100-1000 u ml(-1)). Pyrogallol did not affect responses to nitrergic nerve stimulation. Treatment with DETCA did not alter the differentiating action of pyrogallol. 5. Duroquinone produced a concentration-dependent reduction of relaxations to NO with an IC50 value of 240 microM and 100 microM slightly decreased nitrergic relaxations. After treatment with DETCA, duroquinone produced greater reductions of relaxant responses to NO and to nitrergic stimulation, the IC50 values being 8.5 microM for NO and 40 microM for nitrergic nerve stimulation: these reductions were reversed by SOD. 6. The findings do not support the hypothesis that the presence of Cu/Zn SOD explains the greater susceptibility of NO than the nitrergic transmitter to the superoxide generator pyrogallol, but suggest that it may play a role in the effects of duroquinone.  (+info)

Hematopoietic stem cell tracking in vivo: a comparison of short-term and long-term repopulating cells. (5/1961)

We have previously demonstrated that we could separate long-term repopulating stem cells from cells that provided radioprotection (short-term repopulating cells) on the basis of size and suggested that this might be due to the quiescent nature of long-term repopulating cells. To further define the activity of these populations, we used a dye (PKH26), which incorporates into the membrane of cells and is equally distributed to daughter cells when they divide. We developed an assay, which allowed us to retrieve PKH26(+) long-term and short-term repopulating cells in the hematopoietic tissues of the recipients posttransplant. We were able to recover the labeled cells and determine their cell cycle activity, as well as their ability to reconstitute secondary lethally irradiated hosts in limiting dilution. The results of our assay suggest that long-term repopulating cells are quiescent in the bone marrow (BM) 48 hours after transplant. We were able to detect only a few labeled cells in the peripheral blood posttransplant and even though cells homed to both the spleen and BM, more long-term repopulating cells homed to the marrow and only these cells, which homed to the marrow, were capable of reconstituting lethally irradiated secondary hosts long-term.  (+info)

5-HT2B-receptor antagonist LY-272015 is antihypertensive in DOCA-salt-hypertensive rats. (6/1961)

We previously demonstrated a change in the receptors mediating 5-hydroxytryptamine (5-HT)-induced contraction in arteries of deoxycorticosterone acetate (DOCA)-salt-hypertensive rats. Specifically, contraction to 5-HT is mediated primarily by 5-HT2A receptors in arteries from normotensive sham rats and by both 5-HT2A and 5-HT2B receptors in arteries from hypertensive rats. We hypothesized that the 5-HT2B receptor may play a role in maintaining the high blood pressure of DOCA-salt-hypertensive rats, and herein we provide data connecting in vitro and in vivo findings. The endothelium-denuded isolated superior mesenteric artery of DOCA-salt rats displayed a marked increase in maximum contraction to the newly available 5-HT2B-receptor agonist BW-723C86 compared with that of arteries from sham rats, confirming that the 5-HT2B receptor plays a greater role in 5-HT-induced contraction in arteries from DOCA-salt rats. In chronically instrumented rats, the 5-HT2B-receptor antagonist LY-272015 (0.3, 1.0, and 3.0 mg/kg iv at 30-min intervals) was given cumulatively 1 time/wk during 4 wk of continued DOCA-salt treatment. LY-272015 did not reduce blood pressure of the sham-treated rats at any time or dose. However, LY-272015 (1.0 and 3. 0 mg/kg) significantly reduced mean blood pressure in a subgroup of week 3 (-20 mmHg) and week 4 DOCA-salt (-40 mmHg) rats that had extremely high blood pressure (mean arterial blood pressure approximately 200 mmHg). Blockade of 5-HT2B receptors by in vivo administration of LY-272015 (3.0 mg/kg) was verified by observing reduced 5-HT-induced contraction in rat stomach fundus, the tissue from which the 5-HT2B receptor was originally cloned. These data support the novel hypothesis that 5-HT2B-receptor expression is induced during the development of DOCA-salt hypertension and contributes to the maintenance of severe blood pressure elevations.  (+info)

Rapid and sensitive quantification of Borrelia burgdorferi-infected mouse tissues by continuous fluorescent monitoring of PCR. (7/1961)

The quantity of Borrelia burgdorferi organisms in tissue samples is an important determinant for infection studies in the mouse model of Lyme disease. This report presents the development of a rapid and sensitive external-standard-based PCR assay for the absolute quantification of B. burgdorferi in mouse tissue samples. The assay uses a double-stranded DNA dye to continuously monitor product formation and in less than an hour was able to quantify samples ranging up to 6 log units in concentration. The PCR efficiencies of the sample and the standard were matched by using a standard composed of purified B. burgdorferi chromosome mixed with tissue-matched mouse genome lacking bacterial DNA. Normalization of B. burgdorferi quantities to the mouse nidogen gene allowed comparison of B. burgdorferi numbers in samples isolated from different tissues and strains. PCR analysis of the chromosomal gene recA in cultured B. burgdorferi was consistent with a single recA per bacterium. The parameters defined in this assay should be applicable to quantification of other organisms, even infectious agents for which no ready source of DNA standard is available. In summary, this report presents a rapid external-standard-based PCR method for the quantification of B. burgdorferi in mouse DNA samples.  (+info)

Marked inhibition of tumor growth in a malignant glioma tumor model by a novel synthetic matrix metalloproteinase inhibitor AG3340. (8/1961)

Synthetic matrix metalloproteinase (MMP) inhibitors have activity against a variety of tumors in preclinical models but have not been studied in gliomas. We determined the effect of AG3340, a novel synthetic MMP inhibitor with Ki values against gelatinases in the low picomolar range, on the growth of a human malignant glioma cell line (U87) in SCID-NOD mice. Mice were injected s.c. with U87 cells. Tumors were allowed to grow to a size of approximately 0.5 x 0.5 cm (after about 3 weeks), and the mice were randomized to receive either: (a) 100 mg/kg AG3340 in vehicle; or (b) vehicle control (0.5% carboxymethyl cellulose, 0.1% pluronic F68), both given daily i.p. Tumor area was measured twice weekly, and animals were sacrificed when moribund, or earlier if premorbid histology was examined. In vivo inhibition of tumor growth was profound, with AG3340 decreasing tumor size by 78% compared with controls after 31 days (when controls were sacrificed; P < 0.01, Wilcoxon test). Control animals survived 31 days after the i.p. injections began, and AG3340 mice survived 71 days, representing a >2-fold increase in survival associated with tumor growth delay. Histological examination found that AG3340-treated tumors were smaller, had lower rates of proliferation, and significantly less invasion than control-treated tumors. Hepatic or pulmonary metastases were not seen in either group. In a separate experiment, the tumors were smaller and sampled after a shorter duration of treatment; the changes in proliferation were more marked and occurred earlier than differences in tumor invasion between the two groups. Furthermore, in vitro cell growth was not inhibited at AG3340 concentrations of <1 mM. AG3340 plasma concentrations in vivo, 1 h after administration, ranged from 67 to 365 nM. Thus, AG3340 produced a profound inhibition of glioma tumor growth and invasion. AG3340 markedly increased survival in this in vivo glioma model. Treatment with AG3340 may be potentially useful in patients with malignant gliomas.  (+info)

  • Literature data for other nonpolar organics were compiled for acute and chronic exposures to invertebrates in soils and sediments. (
  • Furthermore, the acute to chronic ratios (ACRs) for soil and sediment tests were within the range of ACRs for aquatic organisms exposed to nonpolar organic chemicals. (
  • High-quality, specialty organic chemicals, intermediates and unique materials for research available in a range of sizes from milligram to kilo quantities. (
  • The majority of the products manufactured in SNC-Pernis are intermediates for the rest of the chemical industry. (
  • NASA's Jet Propulsion Laboratory in California issued a press release saying the rover measured "a tenfold spike" in methane in the atmosphere around it, and detected other organic molecules in a sample collected by a robotic drill. (
  • This is because the electrons in the σ bonds of organic molecules require wavelengths of even higher energy (such as those of X-rays) to excite them to the next higher accessible energy level. (
  • Where do chemical reactions occur in organic molecules? (
  • What organic molecules act as a catalyst for chemical reaction? (
  • Figure 3: Connectivity of Zr 6 nodes in zirconium-based metal-organic frameworks and the associated carboxylate molecules required to link nodes together. (
  • An international team of scientists led by University of Hawai'i at Mânoa Professor Ralf I. Kaiser, Alexander M. Mebel of Florida International University, and Alexander Tielens of Leiden Observatory in the Netherlands, discovered a novel chemical route to form polycyclic aromatic hydrocarbons (PAHs) - complex organic molecules such as naphthalene carrying fused benzene rings - in ultra-cold regions of interstellar space. (
  • These findings have crucial implications not only to reduce the emission of PAHs as toxic byproducts from internal combustion engines, but also rationalize the synthetic routes to a key class of organic molecules in the interstellar medium associated with the origins of life. (
  • Great care must be taken when establishing proportions of organic residues in the production of substrates with coffee husk, cattle or chicken manure or sewage sludge in the calculation of the applied fertilizer quantity in crop fertilization programs. (
  • Organic farming method involved compost, Tithonia diversifolia, and neem cake, while conventional farming used fertilizer and various nematicide. (
  • In the article "Persistent Organic Pollutants," I noticed that β-hexachlorocyclohexane (HCH, historically known as BHC, for benzene hydrochloride) was erroneously referred to as lindane ( C&EN, July 16, page 6 ). (
  • An interesting and important addendum to "Persistent Organic Pollutants" is that nature generates numerous POPs, most notably polybrominated diphenyl ethers and 25 newly discovered polyhalogenated bipyrroles that have no industrial counterpart. (
  • This study suggests that the prevalence of a cluster of cardiovascular risk factors relates to background exposure to a mixture of persistent organic pollutants, several of which are also related to the prevalence of diabetes. (
  • persistent organic pollutants Persistent Organic Pollutants (POPs) are chemical substances that persist in the environment, bioaccumulate through the food web, and pose a risk of causing adverse effects to human health and the environment. (
  • These chemicals had some serious problems because they were toxic to children, pets and plants. (
  • Organic flea treatments and non-toxic solutions solve those problems, says Douglas. (
  • Unfortunately, this chemical is highly toxic and capable of disrupting the thyroid's ability to produce critical hormones, and it is now causing widespread land and water contamination in many parts of the world. (
  • This book examines the role of microbes, from theoretical, field, and applied perspectives, in the degradation of toxic organic chemicals. (
  • To the company making the perfume it is probably a trade secret so we can only guess but often it can be a mix of natural and synthetic scent ingredients and chemicals including petroleum based ingredients and phthalates, a toxic ingredient that has been linked to hormone disruption in our bodies the effects of which are being studied. (
  • An organic body wash that is safe and non-toxic made from plant oils, juices, and extracts. (
  • Not only is it a harmful, endocrine disrupting chemical, mineral oil attracts and holds dirt and toxic materials on your skin. (
  • SLS dissolves the oils on your skin in the same way this toxic chemical is used to dissolve the grease on car engines. (
  • The chemicals in Volume V of the Handbook of Environmental Fate and Exposure Data for Organic Chemicals set are mostly solvents and cover many of the natural products and hydrochlorofluorocarbons and hydrofluorocarbons being considered as replacements for harmful chlorinated solvents and chlorofluorocarbons. (
  • In this study we compared cancer risks from organic hazardous air pollutants (HAPs) based on total personal exposure summed across different microenvironments and exposure pathways. (
  • EPA will hold two public hearings for the proposed rulemaking concerning the residual risk and technology review (RTR) for the National Emission Standards for Hazardous Air Pollutants (NESHAP) for the Miscellaneous Organic Chemical Manufacturing source category. (
  • Methane in the Martian atmosphere and organic chemicals in the red planet's soil are the latest tantalizing findings of NASA's Mars Curiosity rover as it hunts for clues about the possibility of extraterrestrial life, scientists said on Tuesday. (
  • The rover also has found organic chemicals in the Martian soil, the scientists said at a webcast press conference at the American Geophyscial Union conference in San Francisco. (
  • Organic farming delivers other environmental services, improves human health and builds biodiversity above and below the soil line to produce more nutrition per acre. (
  • Building soil organic matter saves soil, improves water quality and is the building block for greater nutritional density. (
  • NaturalNews) The Food Rights Network (FRN), a nonprofit research group, recently issued a press release explaining the test results from a study of San Francisco's free "organic biosolids compost".These independent tests revealed that the free soil, given to the public by San Francisco's Public Utilities Commission, is loaded with endocrine-disruptive chemicals. (
  • As soon as the soil is revitalized, gradually decrease amounts of chemicals to none. (
  • A team of researchers carried out two field trials - one in farmer fields and one on-station - in order to assess the efficacy of organic farming against PPN and other soil pathogens . (
  • The scientists noted that policy development and extension services could consider organic farming as an alternative treatment for soil-borne nematodes in smallholder farms. (
  • A 2011 review published in The Journal of Nematology showed that the use of organic soil amendments might help trump nematode proliferation in various crops. (
  • it is released as a pollutant from chemical factories, landfills, and from agricultural soil due to former use as a fumigant. (
  • The GlobalSpec SpecSearch Database includes some important chemical, thermal, and physical properties of organic chemicals. (
  • Commercial apples have 47 pesticide residues per USDA's pesticide data program, (, so reducing chemicals remains a worthy goal for commercial fruit. (
  • Besides the possibility of nutrient cycling and cost reduction, organic residues have the potential to replace non-renewable materials used in the production of seedlings, such as peat and vermiculite. (
  • I've been buying produce labeled "certified organic" because I'm concerned about pesticide and other chemical residues on and in my food. (
  • The possibility of reducing the use of non-renewable sources in agriculture, along with the need for the suitable disposal of organic residue in the environment, makes nutrient and energy cycling by using organic materials attractive in economic, agricultural and environmental terms. (
  • Biomethanation is an anaerobic process for converting putrescible organic matter (POM) into biogas, a renewable energy, and digestate, a product used in agricultural fertilization. (
  • In 2007, as part of a requested submission to the International Assessment of Agricultural Knowledge, Science and Technology for Development (IAASTD), Professor Hill submitted a very useful and concise table comparing the philosophies and practices of organic-based agriculture (including agroecology) and chemical-intensive, industrialised agriculture. (
  • This method causes the continuous release of water soluble organic material more commonly known as WSO's into the produced water. (
  • Physical properties include state of matter, viscosity, vapor pressure, purity, and concentration which determine how a chemical can be handled. (
  • Shortly after landing, Curiosity found that Mars once had the chemical ingredients and the environmental conditions needed to support microbial life, fulfilling the primary goal of its mission. (
  • Dynamic passive dosing for studying the biotransformation of hydrophobic organic chemicals: microbial degradation as an example. (
  • The construction of thousands of well-defined, porous, metal-organic framework (MOF) structures, spanning a broad range of topologies and an even broader range of pore sizes and chemical functionalities, has fuelled the exploration of many applications. (
  • A new metal-organic framework with ultra-high surface area. (
  • Ultrahigh porosity in metal-organic frameworks. (
  • Isoreticular expansion of metal-organic frameworks with triangular and square building units and the lowest calculated density for porous crystals. (
  • Li, J.-R., Kuppler, R. J. & Zhou, H.-C. Selective gas adsorption and separation in metal-organic frameworks. (
  • Common organic chemicals such as methanol, ethanol, and benzene are produced and purchased in bulk form. (
  • Organic chemicals can be either natural or synthetic. (
  • Most organic chemicals, being carbon based, are natural meaning they can be produced by plants or animals. (
  • The natural origin of these organohalogens is beyond doubt, as established both by Reddy's radiocarbon data and his discovery of several polybrominated diphenyl ethers, halogenated bipyrroles, and Q1-but not DDE, a DDT metabolite, or any halogenated industrial chemical-in archived whale oil from the final voyage in 1921 of the Charles W. Morgan whaling ship years before the industrial production and bioaccumulation of organobromine flame retardants and other POPs. (
  • Some of the chemicals are used to help fragrance last on the skin, some provide long shelf life while others may be used because they offer an inexpensive solution to pure, natural ingredients. (
  • Organic or natural essential oils. (
  • Organic natural grain alcohol from a variety of different grains. (
  • but natural and organic perfume offers more than great ingredients. (
  • I am tempted by all the wonderful sounding combinations but between my allergies to even some natural scents and my complete lack of knowledge of how lavender will smell when mixed with ylang ylang makes that sometimes $50 or more for a bottle of organic perfume not so appealing. (
  • Natural News ) Lots of people are waking up to the dangers of conventional produce and sticking to organic varieties, but a recent study serves as a reminder of why it's also important to go organic when it comes to cow's milk too. (
  • All natural, organic shampoo made to be used on the entire horse leaving a glossy clean coat and ease in combing flowing manes and tails. (
  • Natural News ) Organic farming practices may help mitigate the proliferation of plant-parasitic nematodes (PPN), a study published in the journal Agriculture, Ecosystems & Environment revealed. (
  • The organic argument is merely that you shouldn't use synthetic chemicals, and that natural chemicals should be used with restraint. (
  • An organic farmer tries to accomplish this in a natural way with a minimum of collateral damage. (
  • About the time that Chemical Ag spokespeople were chiding Michelle Obama for promoting home-grown organic food with her White House garden, compost from the Rodale Institute farm was landing on a new organic garden right in front of U.S. Department of Agriculture headquarters. (
  • The Secretary wanted the garden to be certified organic, so all the inputs--including compost--need to conform to the National Organic Program standards. (
  • Giving out sludge-based 'compost' that contains PDBEs, triclosan, and who knows what other toxins, while calling it 'organic compost', knowing it would be applied to school and home gardens, is wrong on a number of levels. (
  • The staff of the Public Utilities Commission and Mayor Gavin Newsom have allowed Bay Area residents to become guinea pigs in a heinous scam that has fooled gardeners into thinking they were receiving real organic compost for their gardens, when they were tricked into allowing the sewage sludge industry to use their gardens as a waste dump. (
  • The company was established with the objective of attaining self-reliance in basic organic chemicals needs. (
  • The ethyl alcohol and other basic organic chemicals market size is expected to reach $750 billion by 2022, significantly growing at a CAGR of around 1.5% during the forecast period. (
  • The global ethyl alcohol and other basic organic chemicals market is further segmented based on type and geography. (
  • Ethyl Alcohol And Other Basic Organic Chemical Global Market Briefing 2020: Covid 19 Impact and Recovery provides strategists, marketers and senior management with the critical information they need to assess the global ethyl alcohol and other basic organic chemical sector. (
  • Ethyl Alcohol And Other Basic Organic Chemical Global Market Briefing 2020: Covid 19 Impact and Recovery from the Business Research Company covers market characteristics, size and growth, segmentation, regional breakdowns, trends and strategies for this market. (
  • The market size section gives the ethyl alcohol and other basic organic chemical market revenues, covering both the historic growth of the market and forecasting the future. (
  • The trends and strategies section highlights the likely future developments in the ethyl alcohol and other basic organic chemical market and suggests approaches. (
  • If contaminated water is used to irrigate organic crops, those vegetables will then likely be tainted with high levels of this endocrine-disrupting chemical, whether certified organic or not. (
  • Perchlorate is an endocrine-disrupting chemical known to disrupt thyroid function and hormone production by inhibiting your thyroid gland's iodine uptake. (
  • It is no longer possible to believe that you can avoid toxins simply by eating organic, unless something is done about the conventional and dominant food production and distribution system. (
  • Your makeup, face cream, skin moisturizer, or cleanser may deliver short-term smoothness and brightness, but it also may disrupt your hormones, expose you to cancer-causing chemicals, and deliver dangerous toxins that age your skin. (
  • While being drawn from the liquid the fibres usually harden, which may involve mere cooling (where the liquid is normally solid at room temperature, for example), chemical hardening (for example by treatment with a hardening vapour) or evaporation of solvent (for example by dehydration). (