Nitroso Compounds
Mostrando 1-12 de 53 artigos, teses e dissertações.
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1. Zwitterionic Surfactant Stabilized Palladium Nanoparticles as Catalysts in Aromatic Nitro Compound Reductions
Palladium nanoparticles (NPs) stabilized by ImS3-14, a zwitterionic surfactant structurally related to ionic liquids, are revealed here to be good catalysts for the reduction of a large number of substituted aromatic nitro compounds. Our mass spectrometry results are consistent with the formation of amino products in a direct route, where the aromatic nitro
J. Braz. Chem. Soc.. Publicado em: 2016-02
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2. Evaluation of the mutagenicity and antimutagenicity of Ziziphus joazeiro Mart. bark in the micronucleus assay
The aim of this study was to evaluate the mutagenicity (clastogenicity/aneugenicity) of a glycolic extract of Ziziphus joazeiro bark (GEZJ) by the micronucleus assay in mice bone marrow. Antimutagenic activity was also assessed using treatments associated with GEZJ and doxorubicin (DXR). Mice were evaluated 24-48 h after exposure to positive (N-nitroso-N-eth
Genet. Mol. Biol.. Publicado em: 2014-06
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3. Development of analyrtical methods for determination of N-nitrosamines in shampoo samples by liquid chromatography coupled to diode array, electrochemical and mass spectrometry detecto / Desenvolvimento de métodos para determinação de N-nitrosaminas em amostras de xampu por cromatografia líquida acoplada à detecção por arranjo de diodos, eletroquímica e espectrometria de massas
N-nitrosamines (NA) are N-nitroso compounds, showed to be carcinogenic in a wide variety of experimental animals. In addition, they also present mutagenic and teratogenic activities. N-nitrosamines have been found during the last three decades in a variety of consumer products, including cosmetic and personal care products, and their raw materials. The most
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 21/02/2011
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4. Reaction mixtures formed by nitrite and selected sulfa-drugs showed mutagenicity in acidic medium
Nitrite, which is present in preserved meat and can be produced in the oral cavity by reduction of nitrate taken from vegetables, could react in stomach with nitrosatable drugs, giving genotoxic-carcinogenic N-nitroso compounds (NOC). The mutagenicity of reaction mixtures formed by sodium nitrite and selected sulfa-drugs (sulfathiazole, HST; phtalylsulfathia
Química Nova. Publicado em: 2009
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5. Estudo do efeito da S-nitroso-N-acetilcisteína na lesão de isquemia/reperfusão em fígado esteatótico de ratos / Study of S-nitroso-N-acetylcysteine effect on ischemia/reperfusion lesion in steatotic livers of rats
INTRODUÇÃO: A esteatose é a doença hepática crônica mais frequente na população. Seus efeitos lesivos hepáticos podem adicionar-se aos efeitos da isquemia e reperfusão (I/R) nos transplantes de fígado e cirurgias hepáticas. Em ambos, o estresse oxidativo e o dano na microcirculação são importantes fatores na gênese da lesão hepática. Vário
Publicado em: 2007
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6. Determinação de nitrosaminas volateis em salsichas "hot dog". / Determination of volatile nitromines in hot-dog sausage.
During the curing process, nitrite and nitrate are the principal ingridients udes for curing. They confer and colored color characteristic of the cured meat as sausage, and act as antioxidants and antimicrobial, comtrolling the growth of Clostridium botulinum. The most important toxic effect of the presence of nitrate and nitrite is the formation of nitrosam
Publicado em: 2006
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7. Investigação da susceptibilidade de formas sanguíneas do plasmodium falciparum à apoptose frente a estímulos com óxido nítrico, cloroquina e estaurosporina. / Inquiry of the susceptibility of sanguineous forms of plasmodium falciparum to apoptosis front the stimulatons with nitric oxide, choloroquine and staurosporine.
It is known that antibodies, nitric oxide and chloroquine inhibit P. falciparum growth, even though the mechanism of parasite death was never clearly elucidated. In the studies where parasite culture was used to access cell death in presence of antiparasite compounds, apoptosis was only investigated on the basis of DNA fragmentation using electrophoresis gel
Publicado em: 2006
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8. EFEITO DE COMPOSTOS ORGÂNICOS DE SELÊNIO EM MODELOS EXPERIMENTAIS DE CÂNCER E DIABETES MELLITUS / EFFECT OF ORGANOSELENIUM COMPOUNDS ON EXPERIMENTAL MODELS OF DIABETES MELLITUS AND CANCER
O presente estudo foi delineado para avaliar o efeito de compostos orgânicos de selênio em modelos experimentais de câncer e diabetes. No modelo de carcinogênese mamária induzida por N-nitroso-N-metilurea (NMU, 3 doses de 50 mg/Kg, i.p.) observou-se que o consumo de uma dieta suplementada com disseleneto de difenila (1 ppm, 7 meses) foi eficaz em aument
Publicado em: 2006
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9. Desenvolvimento de metodos analiticos para determinação de nitrato, nitrito e n-nitrosaminas em produtos carneos
Nitrosamines are N-nitroso compounds formed in certain foods by the reaction of a nitrosating agent, derived from either nitrite salts or nitrogen oxide, with a substance having an amino group. The majority of nitrosamines tested in animals are carcinogenic, mutagenic, teratogenic and act transplacentally. This work describes analytical methods for the deter
Publicado em: 2004
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10. Nitric oxide release from the S-nitrosothiol zinc phthalocyanine complex by flash photolysis
The photogeneration of nitric oxide (NO) using laser flash photolysis was investigated for S-nitroso-glutathione (GSNO) and S-nitroso-N-acetylcysteine (NacySNO) at pH 6.4 (PBS/HCl) and 7.4 (PBS). Irradiation of S-nitrosothiol with light (lambda = 355 nm followed by absorption spectroscopy) resulted in the homolytic decomposition of NacySNO and GSNO to genera
Brazilian Journal of Medical and Biological Research. Publicado em: 2003-05
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11. 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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12. Microbiota in chagasic megaesophagus / Microbiota no megaesôfago chagásico.
The stasis of saliva and swallowed food in the esophageal lumen of patients with chagasic megaesophagus causes: (1) bacterial overgrowth in the esophageal lumen, (2) recurring pulmonary aspirations and respiratory infections, (3) increased risk of surgical or endoscopic procedures if perforation occurs by the major possibility of contamination, and (4) the d
Publicado em: 2001