Urea Peroxide
Mostrando 1-12 de 12 artigos, teses e dissertações.
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1. Use of FTIR-ATR Spectroscopy Combined with Multivariate Analysis as a Screening Tool to Identify Adulterants in Raw Milk
The objective of this study was to use Fourier transform infrared (FTIR) spectroscopy combined with multivariate analysis to identify adulterations in raw milk and in samples from producers. Five levels of concentration of sodium bicarbonate, sodium hydroxide, hydrogen peroxide, starch, sucrose and urea were used. A total of 620 samples previously adulterate
J. Braz. Chem. Soc.. Publicado em: 2019-04
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2. Estudos espectroscópicos dos complexos európio-tetraciclinas e suas aplicações na detecção de peróxido de hidrogênio e peróxido de uréia / Spectroscopic studies of europium-tetracyclines complexes and their applications in detection of hydrogen peroxide and urea peroxide
Neste trabalho foram estudadas as propriedades espectroscópicas do íon európio trivalente complexado à componentes da família das tetraciclinas, a clorotetraciclina, oxitetraciclina e metaciclina, em presença de peróxido de hidrogênio e peróxido de uréia. Para isso foram obtidos os parâmetros ópticos de absorção, emissão, tempo de vida e const
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 24/06/2010
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3. Desenvolvimento de um biossensor de peróxido de hidrogênio de baixo custo baseado na emissão do európio III. / Development of a low cost hydrogen peroxide biosensor based on europium (III).
In this work was studied the optical properties of Europium-Tetracycline complex (EuTc), determining the best conditions to obtain an efficient complex formation. Optical parameters as absorption, emission, lifetime and refractive index were obtained. Variation of europium complexes concentration, temperature, optimal pH and solutions time reaction were anal
Publicado em: 2008
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4. Evaluation of the interaction between sodium hypochlorite and chlorhexidine gel on the root dentin surface / Avaliação da reação do hipoclorito de sódio e do gel de clorexidina na superfície do canal radicular
When combined in the interior of the canal, sodium hypochlorite and chlorhexidine form an insoluble product. The aim of this study was to evaluate the consequences of the use of the hipoclorito of sodium 1% pH 9 (NaOCl) as substance during prepare and gel of clorexidina 2% (CHX) as intracanal medication in different conditions, using environmental scanning e
Publicado em: 2008
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5. "Avaliação da desinfecção da dentina radicular em profundidade provocada pela irradiação do laser de diodo de alta potência" / Evaluation of root canal dentin desinfection in depth caused by high power diode laser irradiation.
The main cause for failure in Endodontics is the presence of microorganisms in root canal system. Enterococcus faecalis is a resistant microorganism presents in failure endodontic treatment. Therefore the disinfection plays fundamental rule in endodontic therapy. The laser irradiation presents properties that may improve the treatment success rates, reducing
Publicado em: 2007
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6. Uso analítico de tecidos e de extratos brutos vegetais como fonte enzimática
This article describes the current status of several analytical methodologies using vegetal tissue and crude extracts as enzymatic source. In this divulgation paper the obtention of vegetal crude extract and/or tissue and selected enzymatic procedures are presented emphasizing its characteristics and peculiarities. Examples of many biosensors and/or flow inj
Química Nova. Publicado em: 2002-05
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7. Urea Hydrogen Peroxide Reduces the Numbers of Lactobacilli, Nourishes Yeast, and Leaves No Residues in the Ethanol Fermentation
Urea hydrogen peroxide (UHP) at a concentration of 30 to 32 mmol/liter reduced the numbers of five Lactobacillus spp. (Lactobacillus plantarum, L. paracasei, Lactobacillus sp. strain 3, L. rhamnosus, and L. fermentum) from ∼107 to ∼102 CFU/ml in a 2-h preincubation at 30°C of normal-gravity wheat mash at ∼21 g of dissolved solids per ml containing nor
American Society for Microbiology.
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8. Growth on Urea Can Trigger Death and Peroxidation of the Cyanobacterium Synechococcus sp. Strain PCC 7002
Laboratory conditions have been identified that cause the rapid death of cultures of cyanobacteria producing urease. Once the death phase had initiated in the stationary growth phase, cells were rapidly bleached of all pigmentation. Null mutations in the ureC gene, encoding the alpha subunit of urease, were constructed, and these mutants were no longer sensi
American Society for Microbiology.
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9. Xanthine oxidase produces hydrogen peroxide which contributes to reperfusion injury of ischemic, isolated, perfused rat hearts.
Three lines of investigation indicated that hydrogen peroxide (H2O2) from xanthine oxidase (XO) contributes to cardiac dysfunction during reperfusion after ischemia. First, addition of dimethylthiourea (DMTU), a highly permeant O2 metabolite scavenger (but not urea) simultaneously with reperfusion improved recovery of ventricular function as assessed by vent
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10. Xanthine oxidase-derived hydrogen peroxide contributes to ischemia reperfusion-induced edema in gerbil brains.
The contribution of toxic O2 metabolites to cerebral ischemia reperfusion injury has not been determined. We found that gerbils subjected to temporary unilateral carotid artery occlusion (ischemia) consistently developed neurologic deficits during ischemia with severities that correlated with increasing degrees of brain edema and brain H2O2 levels after repe
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11. Rheological assessment of mucolytic agents on sputum of chronic bronchitics
In vitro and in vivo studies were made on the sputum of chronic bronchitics using a Ferranti-Shirley cone and plate viscometer and a new stress relaxation method. The latter utilized a modified chemical balance and permitted study at very low shear rates. The results from simpler apparatus correlated well with the data obtained with the cone and plate viscom
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12. Zr[bis(salicylidene)ethylenediaminato]-mediated Baeyer–Villiger oxidation: Stereospecific synthesis of abnormal and normal lactones
Baeyer–Villiger oxidation of racemic bicyclic cyclobutanones with Zr[bis(salicylidene)ethylenediaminato] (salen) complex 1 as catalyst in the presence of a urea-hydrogen peroxide adduct was found to proceed enantiospecifically. The enantiotopos selection in the oxidation was governed primarily by the Zr(salen) catalyst, although migratory aptitude (methine
National Academy of Sciences.