Tert Butyl Hydroperoxide
Mostrando 1-12 de 33 artigos, teses e dissertações.
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1. Modification of Vietnam Natural Rubber via Graft Copolymerization with Styrene
Graft copolymerization of styrene onto deproteinized natural rubber (DPNR) using tert-butyl hydroperoxide (TBHPO) and tetraethylene pentamine (TEPA) as redox initiator have been investigated. The effects of initiator and monomer concentration on conversion and grafting efficiency were studied. The dynamic mechanical and thermal properties of the graft copoly
J. Braz. Chem. Soc.. Publicado em: 2017-04
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2. Effects of Thymoquinone on Interleukin-1 and Interferon Gamma Gene Expression and Antibody Titers against Newcastle Disease in Broiler Chickens under Oxidative Stress
ABSTRACT An experiment was conducted to determine the effects of the dietary inclusion of different levels of thymoquinone (TQ) of broilers subjected to oxidative stress or not on the antibody titers against Newcastle disease and on the gene expression of interleukine-1 and interferon gamma. A total of 320 one-day-old broilers was randomly assigned to eight
Rev. Bras. Cienc. Avic.. Publicado em: 2016-12
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3. Biomimetic oxidation studies of monensin A catalyzed by metalloporphyrins: identification of hydroxyl derivative product by electrospray tandem mass spectrometry
Monensin A is an important commercially available natural product isolated from Streptomyces cinnamonensins that shows antibiotic and anti-parasitic activities. This molecule has a significant influence in the antibiotic market, but until now there are no studies on putative metabolite formations. Bioorganic catalysts applying metalloporphyrins and mono-oxyg
Rev. bras. farmacogn.. Publicado em: 09/08/2013
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4. Epoxidação do óleo de soja com o sistema catalítico [MoO2(acac)2]/TBHP EM [bmim][PF6]
Epoxidation of soybean oil was investigated using 1-n-butyl-3-methylimidazolium hexafluorophosphate [bmim][PF6] ionic liquid as biphasic medium with molybdenum(VI) acetylacetonate complex and tert-butyl hydroperoxide TBHP as oxidizing agent. Reaction conditions were molar ratio TBHP:number of double bonds of oil:catalyst of 100:100:1, reaction temperature of
Quím. Nova. Publicado em: 2012
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5. Ischemic preconditioning reduces peripheral oxidative damage associated with brain ischemia in rats
Brain ischemia followed by reperfusion causes neuronal death related to oxidative damage. Furthermore, it has been reported that subjects suffering from ischemic cerebrovascular disorders exhibit changes in circulating platelet aggregation, a characteristic that might be important for their clinical outcome. In the present investigation we studied tert-butyl
Publicado em: 2010
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6. Papel da 5-Lipoxigenase no controle da carga parasitária e no estresse oxidaltivo de eritrócitos durante a fase aguda da infecção experimental com Trypanosoma cruzi
Recently, it was demonstrated that nitric oxide (NO) produced during Trypanosoma cruzi infection participates of erythrocyte oxidative stress, but is not necessary for the development of anemia in the acute phase of infection in mice. In this work it was investigated the effect of inhibition of leukotrienes (LTs) by pharmacological or genetic blocking of the
Publicado em: 2007
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7. Catálise oxidativa de clusters de rutênio e porfirinas supramoleculares / Oxidative catalysis of ruthenium clusters and supramolecular porphyrins
A atividade catalítica de clusters trigonais de acetato de rutênio e porfirinas supramoleculares contendo quatro unidades de clusters periféricos ou complexos de bis(bipiridina)rutênio, na oxidação de substratos orgânicos por iodosil-benzeno ou terc-butil-hidroperóxido, é abordada nesta tese. Foram feitos estudos cinéticos para elucidar o mecanismo
Publicado em: 2005
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8. Oxidação biomimetica de cicloexano por peroxido de hidrogenio catalisada por sais de cobre (II)
Cyclohexane was oxidized by the GoChAgg system (pyridine, copper (II) salt, H2O2 under ambient conditions. The only reaction product was cyclohexanone. Efficiency and turnover number were studied as a function of the following reaction parameters; temperature; amount of catalyst, substrate and oxidant; presence of acetic acid; effect of counter-ion associate
Publicado em: 1991
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9. Exposure of Phytopathogenic Xanthomonas spp. to Lethal Concentrations of Multiple Oxidants Affects Bacterial Survival in a Complex Manner
During plant-microbe interactions and in the environment, Xanthomonas campestris pv. phaseoli is likely to be exposed to high concentrations of multiple oxidants. Here, we show that simultaneous exposures of the bacteria to multiple oxidants affects cell survival in a complex manner. A superoxide generator (menadione) enhanced the lethal effect of an organic
American Society for Microbiology.
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10. Vitamin K-dependent carboxylase: evidence for a hydroperoxide intermediate in the reaction.
Vitamin K is an essential cofactor for a microsomal carboxylase that converts glutamyl residues in endogenous precursor proteins to gamma-carboxyglutamyl residues in completed proteins. The same microsomal preparations convert vitamin K to its 2,3-epoxide, and it has been suggested that these two reactions (carboxylation and epoxidation) are coupled. Glutath
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11. Endonuclease IV (nfo) mutant of Escherichia coli.
A cloned gene, designated nfo, caused overproduction of an EDTA-resistant endonuclease specific for apurinic-apyrimidinic sites in DNA. The sedimentation coefficient of the enzyme was similar to that of endonuclease IV. An insertion mutation was constructed in vitro and transferred from a plasmid to the Escherichia coli chromosome. nfo mutants had an increas
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12. Free radical-derived quinone methide mediates skin tumor promotion by butylated hydroxytoluene hydroperoxide: expanded role for electrophiles in multistage carcinogenesis.
Free radical derivatives of peroxides, hydroperoxides, and anthrones are thought to mediate tumor promotion by these compounds. Further, the promoting activity of phorbol esters is attributed, in part, to their ability to stimulate the cellular generation of oxygen radicals. A hydroperoxide metabolite of butylated hydroxytoluene, 2,6-di-tert-butyl-4-hydroper