Nitrous Acid
Mostrando 1-12 de 138 artigos, teses e dissertações.
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1. Stimulation of Acidic Reduction of Nitrite to Nitric Oxide by Soybean Phenolics: Possible Relevance to Gastrointestinal Host Defense
This study aimed to evaluate the potential of soybean-promoted acidic nitrite reduction and to correlate this activity with the content of phenolics and with the bactericidal activity againstEscherichia coliO157:H7. Extracts of embrionary axes and cotyledons enriched in phenolics increased •NO formation at acidic pH at values that were 7.1 and 4.5 times hi
Publicado em: 15/06/2013
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2. Systematic mutagenesis method for enhanced production of bacitracin by Bacillus licheniformis mutant strain UV-MN-HN-6
The purpose of the current study was intended to obtain the enhanced production of bacitracin by Bacillus licheniformis through random mutagenesis and optimization of various parameters. Several isolates of Bacillus licheniformis were isolated from local habitat and isolate designated as GP-35 produced maximum bacitracin production (14±0.72 IU ml-1). Bacitr
Brazilian Journal of Microbiology. Publicado em: 2012-03
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3. CinÃtica da reduÃÃo de NOx pelo Ãcido amino sulfÃmico: modelagem e desenvolvimento
Elevated levels of nitrogen oxides (NOX) from flue gases have recently become a major issue in industrial environment. This causes that the laws are becoming each time more demanding. The most employed reduction processes are: absorption by an aqueous acidic solution and catalytic gas-solid reduction. The nitrogen oxides absorbed into water leads to the form
Publicado em: 2006
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4. Desenvolvimento do precesso de reduÃÃo de Ãcido nitroso por Ãcido amino sulfÃmico. Modelagem cinÃtica associada à transferÃncia gÃs-lÃquido
The combustion of organic products, in particular, the natural gas, leads to the generation of nitrogenated oxides (NOx = NO and NO2; N2O) from both sources, the nitrogenous originated from the combustion air and nitrogenated compounds present in the fuel. NOx emissions can damage the human health and environment. They have been contributing widely to the fo
Publicado em: 2003
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5. Cargas atomicas (um novo modelo) : implementação computacional e aplicações
In the present work a computational implementation and a subsequent application of a new atomic charge model are made. This new model was derived after 1990, when a new partition of the atomic polar tensor (APT) was done, in terms of charge, charge flux, atomic dipole flux and homopolar dipole flux. An APT of an atom in a molecule, represented by a 3x3 matri
Publicado em: 1994
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6. Nitrous acid damage to duplex deoxyribonucleic acid: distinction between deamination of cytosine residues and a novel mutational lesion.
The rate of nitrous acid deamination of labeled cytosine residues in native Escherichia coli deoxyribonucleic acid was monitored in vitro by release of acid-soluble counts after treatment with uracil deoxyribonucleic acid glycosylase. The reaction exhibited a lag and was not stimulate by several agents previously shown to enhance base substitution mutagenesi
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7. Extraction of group A streptococcal M protein with nitrous acid.
Specific precipitating and opsonic neutralizing antigens were identified in dilute-nitrous acid extracts of group A streptococci. This was done by decreasing the temperature and time of exposure of the streptococcal cells to the nitrous acid. Ninety percent of 31 strains of group A streptococcal dilute-nitrous acid extracts formed precipitin lines of identit
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8. CROSS-RESISTANCE RELATIONSHIPS IN ESCHERICHIA COLI BETWEEN ULTRAVIOLET RADIATION AND NITROUS ACID
Zampieri, Antonio (Palo Alto Medical Research Foundation, Palo Alto, Calif.), and Joseph Greenberg. Cross-resistance relationships in Escherichia coli between ultraviolet radiation and nitrous acid. J. Bacteriol. 87:1094–1099. 1964.—A number of radiosensitive and radioresistant strains of Escherichia coli were tested for sensitivity to injury by nitrous
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9. Efficiency of Nitrous Acid as An Inactivating and Mutagenic Agent of Intact Tobacco Mosaic Virus and Its Isolated Nucleic Acid 1
When tobacco mosaic virus (TMV) and its isolated nucleic acid (TMV-RNA) were treated with nitrous acid, the nucleic acid was inactivated six times faster than the intact virus. Inactivation of both the infectious entities was exponential with treatment time to 0.1% level of survival. Eight different mutant phenotypes were scored after inactivation of TMV and
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10. Mutagenic specificity in reovirus.
Mutagenic specificity in response to chemical mutagens has been observed with certain temperature-sensitive mutants of reovirus type 3. One mutant induced by nitrous acid reverted specifically with nitrous acid. Three nitrosoguanidine-induced mutants reverted after nitrous acid treatment. These findings thus suggest that analysis of chemical induction of rev
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11. Evaluation of the Culturette Brand Ten-Minute Group A Strep ID technique.
A direct extraction of the antigens of group A beta-hemolytic streptococci from 557 throat swabs was performed by a new microtechnique of the nitrous acid extraction method with the Culturette Brand Ten-Minute Strep ID technique from Marion Scientific, Division of Marion Laboratories, Inc., Kansas City, Mo. This group A latex reagent kit contains the reagent
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12. Heterogeneity of group A type-specific antibodies.
Extracting type 6 group A streptococcai with dilute nitrous acid releases an antigen that exhibits type-specific precipitating properties with anti-M6 serum but fails to neutralize the type-specific bactericidal reaction or to absorb the bactericidal antibody from anti-M6 serum. These studies suggest that the precipitating and antiphagocytic properties of th