Results 301 to 310 of about 70,527 (351)
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Inclusion of Quaternary Ammonium Compounds by Calixarenes
Journal of Inclusion Phenomena and Molecular Recognition in Chemistry, 1994In weakly polar solvents, strong association occurs between calixarene anions and tetraalkylammonium cations, with the magnitude of the observed equilibrium constants depending upon the charge on the anion, the solvent, the ring size of the calixarene and the nature of the alkyl group of the cation. Large upfield shifts of the methyl resonances of the [
Jack M. Harrowfield +2 more
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Quaternary Ammonium Compound Toxicity in Chickens
Avian Diseases, 1982Two commercial White Leghorn flocks of 41,000 and 57,000 25-week-old hens experienced death losses of 676 and 1,089 birds in a week. Six birds from each flock were presented for necropsy to the Animal Disease Diagnostic Laboratory at Purdue University with a clinical history of excessive deaths, unsatisfactory production, and dehydration. Gross lesions
A. S. Dhillon +2 more
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Quaternary ammonium compounds in the Capparaceae
Biochemical Systematics and Ecology, 1996Abstract Fifty-five species and varieties of Capparaceae distributed in 17 genera have been examined for the presence of betaines and other quaternary ammonium compounds. Prolinebetaine and/or 3-hydroxyprolinebetaine were detected in all the species examined of Crataeva, Ritchiea, Maerua, Boscia, Capparis, Cladostemon, Cadaba, Thilachium, Morisonia
Kenneth Jewers +2 more
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Quaternary ammonium compounds and occupational asthma
International Archives of Occupational and Environmental Health, 2000Quaternary ammonium compounds, among which benzalkonium chloride is one of the best-known, are commonly used as antiseptics, disinfectants, detergents and preservatives. They can cause occupational asthma, which however, has been rarely reported so far, despite wide use of these products. We report three such cases.
C Moreau +5 more
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Quaternary Ammonium Compounds as Preservatives*
Journal of the American Pharmaceutical Association (Scientific ed.), 1947The antiseptics employed were cetyl pyridinium chloride (Ceepryn) and p‐tertiary octylphenoxyethoxyethyl dimethyl benzyl ammonium chloride (Phemerol). Very low concentrations of these antiseptics were found effective in preserving both gelatin and sucrose solutions.
L.F. Tice, A.W. Moore
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Ototoxic Effect of Quaternary Ammonium Compounds
Acta Oto-Laryngologica, 1982In earlier investigations by the author it has been shown that chlorhexidine, when introduced into the middle ear of guinea pigs, caused serious damage to the inner ear. The present investigation was performed in order to study if the quaternary ammonium compounds benzethonium chloride and benzalkonium chloride, frequently used for skin disinfection ...
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2002
Quaternary ammonium chlorides (QACs) occupy a unique niche in the world of antimicrobial compounds. Rather than being a single, well-defined substance, as is the case for many such active ingredients, QACs are composed of a diverse, eclectic collection of substances that share a common chemical motif, namely a molecular structure containing a positively
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Quaternary ammonium chlorides (QACs) occupy a unique niche in the world of antimicrobial compounds. Rather than being a single, well-defined substance, as is the case for many such active ingredients, QACs are composed of a diverse, eclectic collection of substances that share a common chemical motif, namely a molecular structure containing a positively
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2012
The main cause of failure of biomedical implants is bacterial infections. Despite all efforts, it will never be possible to completely free operating theaters from bacteria, as human bodies contain already 1014 bacteria. Once on a surface, bacteria start proliferating, while protecting themselves with a slime layer against the immune system and ...
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The main cause of failure of biomedical implants is bacterial infections. Despite all efforts, it will never be possible to completely free operating theaters from bacteria, as human bodies contain already 1014 bacteria. Once on a surface, bacteria start proliferating, while protecting themselves with a slime layer against the immune system and ...
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Active transport of quaternary ammonium compounds into bile
American Journal of Physiology-Legacy Content, 1963The quaternary ammonium ion, procaine amide ethobromide (PAEB), administered intravenously (5 mg/kg) to rats with ligated renal pedicles, rapidly appears in the bile in high concentrations, both as free PAEB and as conjugated PAEB. During 1 hr after administration of the compound, the biliary concentrations of free as well as conjugated compound are ...
Lewis S. Schanker, Harvey M. Solomon
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Tolerance of Bacteria for Quaternary Ammonium Compounds
Journal of Food Science, 1968SUMMARY– Escherichia coli and Pseudomonas fluorescens followed similar patterns of adaptation to tolerate quaternary ammonium compounds. E. coli approached a tolerance at 28 μg/ml in nutrient broth after 12 to 14 daily transfers. P. fluorescens adapted more rapidly in a similar medium, reaching a level of 120 μg/ml in 12 days.
R. B. Maxcy, P. R. Soprey
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