P Nitrophenol
Mostrando 25-36 de 114 artigos, teses e dissertações.
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25. Evaluation of Exposure to Nitrobenzene: Absorption of Nitrobenzene Vapour through Lungs and Excretion of p-Nitrophenol in Urine
In order to obtain a quantitative test for measuring exposure to nitrobenzene, experiments on men were done, in which nitrobenzene vapours (5 to 30 μg./l.) were absorbed into the lungs only. During an exposure of six hours the retention of nitrobenzene in the lungs diminished from approximately 87 to 73%. p-Aminophenol was not detected in the urine by the m
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26. Anaerobic biodegradation of phenolic compounds in digested sludge.
We examined the anaerobic degradation of phenol and the ortho, meta, and para isomers of chlorophenol, methoxyphenol, methylphenol (cresol), and nitrophenol in anaerobic sewage sludge diluted to 10% in a mineral salts medium. Of the 12 monosubstituted phenols studied, only p-chlorophenol and o-cresol were not significantly degraded during an 8-week incubatio
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27. Excretion of P-Nitrophenol and p-Aminophenol in the Urine of a Patient Exposed to Nitrobenzene
An account is given of a patient who had chronic exposure to nitrobenzene and in whom the metabolites, p-nitrophenol and p-aminophenol, were present in the urine. A method of separative determination of these two substances in urine is described.
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28. Relationship between alveolar PO2 and the rate of p-nitroanisole O-demethylation by the cytochrome P-450 pathway in isolated rabbit lungs.
The relationship between alveolar PO2 and the rate of O-demethylation of p-nitroanisole, a model substrate for cytochrome P-450 -linked mixed-function oxidation, was evaluated in the isolated rabbit lung perfused with Krebs-Ringer bicarbonate buffer. The appearance of the product, p-nitrophenol, in the pulmonary perfusate was measured spectrophotometrically,
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29. Effects of Adaptation on Biodegradation Rates in Sediment/Water Cores from Estuarine and Freshwater Environments †
Experiments were devised to determine whether exposure to xenobiotics would cause microbial populations to degrade the compounds more rapidly during subsequent exposures. Studies were done with water/sediment systems (ecocores) taken from a salt marsh and a river. Systems were tested for adaptation to the model compounds methyl parathion and p-nitrophenol. 1
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30. Biotransformation of Hydroxylaminobenzene and Aminophenol by Pseudomonas putida 2NP8 Cells Grown in the Presence of 3-Nitrophenol
Biotransformation products of hydroxylaminobenzene and aminophenol produced by 3-nitrophenol-grown cells of Pseudomonas putida 2NP8, a strain grown on 2- and 3-nitrophenol, were characterized. Ammonia, 2-aminophenol, 4-aminophenol, 4-benzoquinone, N-acetyl-4-aminophenol, N-acetyl-2-aminophenol, 2-aminophenoxazine-3-one, 4-hydroquinone, and catechol were prod
American Society for Microbiology.
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31. Parathion utilization by bacterial symbionts in a chemostat.
A continuous-culture device was used to select and enrich for microorganisms, from sewage and agricultural runoff, that were capable of using the organophosphorus insecticide parathion as a sole growth substrate. Parathion was dissimilated by the highly acclimated symbiotic activities of Pseudomonas stutzeri, which non-oxidatively and cometabolically hydroly
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32. Degradation and Induction Specificity in Actinomycetes That Degrade p-Nitrophenol
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33. Purification and characterization of a bacterial nitrophenol oxygenase which converts ortho-nitrophenol to catechol and nitrite.
A nitrophenol oxygenase which stoichiometrically converted ortho-nitrophenol (ONP) to catechol and nitrite was isolated from Pseudomonas putida B2 and purified. The substrate specificity of the enzyme was broad and included several halogen- and alkyl-substituted ONPs. The oxygenase consisted of a single polypeptide chain with a molecular weight of 58,000 (de
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34. Influence of Calcium, Iron, and pH on Phosphate Availability for Microbial Mineralization of Organic Chemicals
A study was conducted to determine some of the factors affecting the P requirement for the biodegradation of p-nitrophenol, phenol, and glucose by Pseudomonas and Corynebacterium strains. Mineralization of glucose was rapid and the Pseudomonas sp. grew extensively in solutions with 5 and 10 mM phosphate, but the rate and extent of degradation were low and th
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35. Pathways of microbial metabolism of parathion.
A mixed bacterial culture, consisting of a minimum of nine isolates, was adapted to growth on technical parathion (PAR) as a sole carbon and energy source. The primary oxidative pathway for PAR metabolism involved an initial hydrolysis to yield diethylthiophosphoric acid and p-nitrophenol. A secondary oxidative pathway involved the oxidation of PAR to paraox
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36. The ortho-nitrophenol (ONPG) test and acid from lactose in Gram-negative genera
The results are given of the ortho-nitrophenol test for beta-galactosidase production (ONPG test) on 588 strains of 123 aerobic species of bacteria, representing 30 genera. Apart from some strains of Erwinia herbicola (synonym Chromobacterium typhiflavum) and of Yersinia spp, these strains were not members of the Enterobacteriaceae, in which family the ONPG