Relevant bibliographies by topics / Urea hydrogen peroxide

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  1. Journal articles
  2. Dissertations / Theses
  3. Book chapters
  4. Conference papers

Academic literature on the topic 'Urea hydrogen peroxide'

Author: Grafiati
Published: 4 June 2021
Last updated: 17 February 2022

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Journal articles on the topic "Urea hydrogen peroxide"

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Taliansky, Sandra. "Urea-Hydrogen Peroxide Complex." Synlett 2005, no. 12 (July 20, 2005): 1962–63. http://dx.doi.org/10.1055/s-2005-871968.

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Li, Zong Quan, Hong Yan Dou, Xiao Qian Chen, and Chao Wang. "Improving Hydrogen Peroxide Bleaching of PRC-APMP by Using Urea." Applied Mechanics and Materials 295-298 (February 2013): 335–38. http://dx.doi.org/10.4028/www.scientific.net/amm.295-298.335.

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Preconditioning Refiner Chemic Alkaline Peroxide Mechanical Pulp (PRC-APMP) is one of the most currently used high yield pulps in China. During the bleaching of PRC-APMP, hydrogen peroxide is a commonly used bleaching agent. In order to improve the bleaching efficiency of PRC-APMP, urea was used as an activator in peroxide bleaching of aspen PRC-APMP. The results showed that the brightness of the urea-based bleached pulp higher than that without urea addition at the same hydrogen peroxide dosage. The physical properties such as the breaking length, tear index and fiber length of the bleached pulp were comparable to those without urea addition in peroxide bleaching.
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A. Valderrama, Jaime, M. Florencia González, and Cristián Torres. "Epoxidation of Quinones with Urea Hydrogen Peroxide." HETEROCYCLES 60, no. 10 (2003): 2343. http://dx.doi.org/10.3987/com-03-9863.

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4

Cooper, Mark S., Harry Heaney, Amanda J. Newbold, and William R. Sanderson. "Oxidation Reactions Using Urea-Hydrogen Peroxide; A Safe Alternative to Anhydrous Hydrogen Peroxide." Synlett 1990, no. 09 (1990): 533–35. http://dx.doi.org/10.1055/s-1990-21156.

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5

Zun, Maria, Dorota Dwornicka, Katarzyna Wojciechowska, Katarzyna Swiader, Regina Kasperek, Marzena Rzadkowska, and Ewa Poleszak. "Kinetics of the decomposition and the estimation of the stability of 10% aqueous and non-aqueous hydrogen peroxide solutions." Current Issues in Pharmacy and Medical Sciences 27, no. 4 (December 1, 2014): 213–16. http://dx.doi.org/10.1515/cipms-2015-0017.

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Abstract In this study, the stability of 10% hydrogen peroxide aqueous and non-aqueous solutions with the addition of 6% (w/w) of urea was evaluated. The solutions were stored at 20°C, 30°C and 40°C, and the decomposition of hydrogen peroxide proceeded according to first-order kinetics. With the addition of the urea in the solutions, the decomposition rate constant increased and the activation energy decreased. The temperature of storage also affected the decomposition of substance, however, 10% hydrogen peroxide solutions prepared in PEG-300, and stabilized with the addition of 6% (w/w) of urea had the best constancy.
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Lespinas, F., G. Dupuy, F. Revol, and C. Aubry. "Enzymic urea assay: a new colorimetric method based on hydrogen peroxide measurement." Clinical Chemistry 35, no. 4 (April 1, 1989): 654–58. http://dx.doi.org/10.1093/clinchem/35.4.654.

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Abstract We describe a new enzymic colorimetric method in which urea is measured in serum by use of a single reagent mixture. Ammonia produced by urea hydrolysis, catalyzed by urease, reacts with glutamate and ATP in the presence of glutamine synthetase. The ADP so produced is assayed in reactions catalyzed sequentially by pyruvate kinase and pyruvate oxidase in a system that generates hydrogen peroxide. The hydrogen peroxide is measured at 500 or 550 nm in a reaction catalyzed by horseradish peroxidase, with phenol/4-aminophenazone as the chromogen. The reaction is complete in 15 min at 37 degrees C. The standard curve is linear up to a urea concentration of 40 mmol/L. Precision is good; CVs ranged from 2.5% to 3.1%. Results by the present method compared well with those by a candidate Reference Method and are not subject to interferences from commonly used drugs and anticoagulants.
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Narendranath, N. V., K. C. Thomas, and W. M. Ingledew. "Urea Hydrogen Peroxide Reduces the Numbers of Lactobacilli, Nourishes Yeast, and Leaves No Residues in the Ethanol Fermentation." Applied and Environmental Microbiology 66, no. 10 (October 1, 2000): 4187–92. http://dx.doi.org/10.1128/aem.66.10.4187-4192.2000.

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ABSTRACT 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, andL. fermentum) from ∼107 to ∼102CFU/ml in a 2-h preincubation at 30°C of normal-gravity wheat mash at ∼21 g of dissolved solids per ml containing normal levels of suspended grain particles. Fermentation was completed 36 h after inoculation of Saccharomyces cerevisiae in the presence of UHP, even when wheat mash was deliberately contaminated (infected) withL. paracasei at ∼107 CFU/ml. There were no significant differences in the maximum ethanol produced between treatments when urea hydrogen peroxide was used to kill the bacteria and controls (in which no bacteria were added). However, the presence of L. paracasei at ∼107 CFU/ml without added agent resulted in a 5.84% reduction in the maximum ethanol produced compared to the control. The bactericidal activity of UHP is greatly affected by the presence of particulate matter. In fact, only 2 mmol of urea hydrogen peroxide per liter was required for disinfection when mashes had little or no particulate matter present. No significant differences were observed in the decomposition of hydrogen peroxide in normal-gravity wheat mash at 30°C whether the bactericidal agent was added as H2O2 or as urea hydrogen peroxide. NADH peroxidase activity (involved in degrading H2O2) increased significantly (P = 0.05) in the presence of 0.75 mM hydrogen peroxide (sublethal level) in all five strains of lactobacilli tested but did not persist in cells regrown in the absence of H2O2. H2O2-resistant mutants were not expected or found when lethal levels of H2O2 or UHP were used. Contaminating lactobacilli can be effectively managed by UHP, a compound which when used at ca. 30 mmol/liter happens to provide near-optimum levels of assimilable nitrogen and oxygen that aid in vigorous fermentation performance by yeast.
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Zhao, Xiao Ling. "Preparation of Silver Nano-Particles by CO(NH2)2·H2O2." Advanced Materials Research 391-392 (December 2011): 1244–47. http://dx.doi.org/10.4028/www.scientific.net/amr.391-392.1244.

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This article will present using chemical reduction to prepare silver nano-particles, which is a certain improvement base on the traditional hydrogen peroxide (H2O2) Silver ammonia by using a new reductant urea peroxide (CO (NH2) 2•H2O2) to replace hydrogen peroxide. Hydrogen Peroxide silver ammonia is widely used in the nano-silver particles Preparation, however, the nano-silver particles prepared in traditional ways is not homogeneous and very easy agglomerated, therefore, in this experimental by using of urea peroxide as a reductant, under condition of temperature 30°C, 45 nm homogeneous nano-silver particles is successfully prepared. The detection instrument used in the experimental is transmission electron microscopy and laser particle size analyzer.
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Ball, Matthew C., and Steven Massey. "The thermal decomposition of solid urea hydrogen peroxide." Thermochimica Acta 261 (September 1995): 95–106. http://dx.doi.org/10.1016/0040-6031(95)02399-m.

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COOPER, M. S., H. HEANEY, A. J. NEWBOLD, and W. R. SANDERSON. "ChemInform Abstract: Oxidation Reactions Using Urea-Hydrogen Peroxide. A Safe Alternative to Anhydrous Hydrogen Peroxide." ChemInform 22, no. 5 (August 23, 2010): no. http://dx.doi.org/10.1002/chin.199105124.

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Dissertations / Theses on the topic "Urea hydrogen peroxide"

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GRASSO, ANDREA N. "Estudos espectroscopicos dos complexos europio-tetraciclinas e suas aplicacoes na deteccao de peroxido de hidrogenio e peroxido de ureia." reponame:Repositório Institucional do IPEN, 2010. http://repositorio.ipen.br:8080/xmlui/handle/123456789/9567.

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IPEN/D
Instituto de Pesquisas Energeticas e Nucleares - IPEN-CNEN/SP
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2

Grasso, Andrea Nastri. "Estudos espectroscópicos dos complexos európio-tetraciclinas e suas aplicações na detecção de peróxido de hidrogênio e peróxido de uréia." Universidade de São Paulo, 2010. http://www.teses.usp.br/teses/disponiveis/85/85134/tde-02082011-135227/.

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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 construídas curvas de calibração para os espectros de luminescência. Realizaram-se experimentos com compostos inorgânicos juntamente com os complexos a fim de verificar a interferência dos mesmos. Também foram realizados estudos para determinação de glicose utilizando os complexos európiotetraciclinas como biossensor. Os resultados mostram que os complexos európiotetraciclinas apresentam um espectro de emissão bem definido na região do visível e, na presença de peróxido de hidrogênio ou peróxido de uréia, há um aumento sensível na luminescência e tempo de decaimento. Assim, os complexos európiotetraciclinas estudados podem ser utilizados como biossensores para determinação dos peróxidos de hidrogênio e uréia, sendo um método realizado em temperatura ambiente, direto e de baixo custo. Um método indireto para determinação de glicose foi estudado através da adição da enzima glicose oxidase aos complexos európiotetraciclinas na presença de glicose no qual há como produto o peróxido de hidrogênio.
In this work were studied the spectroscopic properties of trivalent europium ion complexed with components of tetracycline family, chlorotetracycline, oxytetracycline and metacycline, in the presence of hydrogen peroxide and urea peroxide. Optical parameters were obtained such as absorption, emission, lifetime and calibration curves were constructed for luminescence spectra. Experiments were carried out with both inorganic compounds and europium-tetracyclines complexes in order to verify possible interferences. Studies for glucose determination were also described using europium-tetracyclines complexes as biosensors. Results show that europiumtetracyclines complexes emit a narrow band in the visible region and, in the presence of hydrogen peroxide or urea peroxide there is a greater enhancement in their luminescence and lifetime. Thus, europium-tetracyclines complexes studied can be used as biosensors for hydrogen and urea peroxides determination as a low cost and room temperature method. An indirect method for glucose determination was studied by adding glucose oxidase enzyme in europium-tetracyclines complex in the presence of glucose promoting as product hydrogen peroxide.
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Silva, Flávia Rodrigues de Oliveira. "Desenvolvimento de um biossensor de peróxido de hidrogênio de baixo custo baseado na emissão do európio III." Universidade de São Paulo, 2008. http://www.teses.usp.br/teses/disponiveis/3/3140/tde-02062008-143539/.

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Neste trabalho estudou-se as propriedades ópticas do complexo Európio- Tetraciclina (EuTc), determinando as melhores condições para se obter uma formação eficiente do complexo. Parâmetros ópticos como absorção, emissão, tempo de vida e índice de refração foram obtidos. Variação da concentração de európio no complexo, da temperatura, pH ótimo e tempo de reação das soluções foram analisados. Um aumento na banda de emissão do európio foi observado com adição de peróxido de hidrogênio (HP) na solução. As amostras foram preparadas com pH neutro e a luminescência visível do lantanídeo foi detectada após uma incubação das amostras por 30 min. Um método direto para determinação de peróxido de uréia (PHU) e colesterol, em solução, usando a fluorescência do complexo EuTc é descrito. Os resultados mostram que o complexo é ainda mais sensível para o peróxido de uréia, aumentando a intensidade de emissão em até 40 vezes, do que para o peróxido de hidrogênio, que proporciona um aumento máximo de 15 vezes, quando comparados ao EuTc puro. É reportado também, pela primeira vez, que para a determinação do colesterol total, utilizando-se a sonda EuTc, não há necessidade de adição de enzima na solução, além de ser capaz de detectar frações de colesterol (LDL, VLDL e HDL), também sem adição de outros reagentes. Esse método mostra que o complexo pode ser usado como biossensor de alta sensibilidade, boa precisão, resposta rápida, baixo custo e resultados reprodutíveis para a determinação direta do peróxido de hidrogênio, do peróxido de uréia, de colesterol e LDL e para a determinação indireta da glicose. Uma proposta para a construção de um protótipo de equipamento para medidas de emissão do európio, miniaturizado, portátil, e de baixo custo, que possa ser utilizado com maior facilidade e rapidez, é apresentado.
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 analyzed. An increase in the europium emission band was observed with the addition of hydrogen peroxide (HP) in the solution. The samples were prepared with neutral pH and the lanthanide visible luminescence was detected after a samples incubation of 30 min. A direct method to determine urea hydrogen peroxide (PHU) and cholesterol, in solution, using a fluorescent EuTc complex is described. The results show that the complex is more sensitive for urea hydrogen peroxide, it is over fortyfold higher, while for hydrogen peroxide the increasing is fifteenfold higher when compared to pure EuTc complex emission intensity. It is also reported, for the first time, for the determination of cholesterol total, using the EuTc probe, the enzymatic reaction is not necessary, and also is possible to detect cholesterol fractions (LDL, VLDL and HDL), without the addition of other reagents. This method shows that the complex can be used as a biossensor of high sensibility, good accuracy, fast response, low cost and reproducible results to direct determination of hydrogen peroxide, urea hydrogen peroxide, cholesterol and LDL, and to indirect determination of glucose. A prototype for the construction of miniaturized equipment, portable, low cost, easier and faster to be used, is presented.
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Rong, Dawen, Victoria A. Phillips, R. S. Rubio, Castro M. Angeles, and Richard T. Wheelhouse. "A safe, convenient and efficient method for the preparation of heterocyclic N-oxides using urea-hydrogen peroxide." 2008. http://hdl.handle.net/10454/6160.

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A novel, convenient, and high-yielding method has been developed for the preparation of heterocyclic N-oxides. The reaction uses the urea·hydrogen peroxide addition complex as a peroxide source for the in situ generation of trifluoroperacetic acid. The advantages of this method are easy handling of a stable, solid oxidant; high yields and simple removal of excess reagents and by-products.
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Book chapters on the topic "Urea hydrogen peroxide"

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Ayeb, Karima, Noomen Moussa, Giuseppe Marci, Elisa Garcia-Lopez, and Mohamed Faouzi Nsib. "Effect of Urea–Hydrogen Peroxide Content on the Photocatalytic Activity of Zinc Oxide Nanoparticles." In Recent Advances in Environmental Science from the Euro-Mediterranean and Surrounding Regions (2nd Edition), 435–39. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-51210-1_69.

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Aitken, R. A., and K. M. Aitken. "Oxidation of an Oxime Group Using Hydrogen Peroxide with Urea and Methyltrioxorhenium(VII) Catalyst." In Nitro, Nitroso, Azo, Azoxy, and Diazonium Compounds, Azides, Triazenes, and Tetrazenes, 1. Georg Thieme Verlag KG, 2010. http://dx.doi.org/10.1055/sos-sd-041-00116.

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Małgorzata Kurowska, Marzena. "TIP Aquaporins in Plants: Role in Abiotic Stress Tolerance." In Abiotic Stress in Plants [Working Title]. IntechOpen, 2020. http://dx.doi.org/10.5772/intechopen.94165.

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Tonoplast Intrinsic Proteins (TIP) are one of five subfamilies of aquaporins in higher plants. Plants typically contain a large number of TIP genes, ranging from 6 to 35 compared to humans. The molecular weight of the TIP subfamily members ranges from 25 to 28 kDa. Despite their sequence diversity, all TIP monomers have the same structure, which consists of six transmembrane helices and five inter-helical loops that form an hourglass shape with a central pore. Four monomers form tetramers, which are functional units in the membrane. TIPs form channels in the tonoplast that basically function as regulators of the intracellular water flow, which implies that they have a role in regulating cell turgor. TIPs are responsible for precisely regulating the movement of not only water, but also some small neutral molecules such as glycerol, urea, ammonia, hydrogen peroxide and formamide. The expression of TIPs may be affected by different environmental stresses, including drought, salinity and cold. TIPs expression is also altered by phytohormones and the appropriate cis-regulatory motifs are identified in the promotor region of the genes encoding TIPs in different plant species. It was shown that manipulating TIP-encoding genes expression in plants could have the potential to improve abiotic stress tolerance.
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Conference papers on the topic "Urea hydrogen peroxide"

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Bogdal, Dariusz, Marcin Lukasiewicz, and Jan Pielichowski. "Microwave-Assisted Oxidation of Alcohols Using Urea Hydrogen Peroxide." In The 8th International Electronic Conference on Synthetic Organic Chemistry. Basel, Switzerland: MDPI, 2004. http://dx.doi.org/10.3390/ecsoc-8-01986.

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Courrol, Lilia C., Flávia R. d. O. Silva, Luiz V. G. Tarelho, Maria H. Bellini, Ronaldo D. Mansano, Laércio Gomes, and Nilson D. Vieira, Jr. "Enhancement of europium luminescence in tetracycline-europium complex in the presence of urea hydrogen peroxide." In Biomedical Optics 2006, edited by Samuel Achilefu, Darryl J. Bornhop, and Ramesh Raghavachari. SPIE, 2006. http://dx.doi.org/10.1117/12.641289.

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