Catalyse
Mostrando 1-12 de 76 artigos, teses e dissertações.
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1. Modificação pós-traducional pendente de SUMO em Schistosoma mansoni: padrão de expressão diferencial durante a transição de cercária a esquistossômulo
Attachment of SUMO to target proteins occur through by similar mechanism to ubiquitination, with sequential action of three enzymes: E1 activating (Aos1-Uba2), E2 conjugation (Ubc9) and E3 ligases (PIAS, Polycomb2 and RanBP2). SUMO is synthesized as inactive precursors that require processing by specific proteases (SENPs). SUMO attachment is a reversible and
Publicado em: 2010
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2. DecomposiÃÃo do perÃxido de hidrogÃnio sobre catalisadores de palÃdio / Hydrogen peroxide decomposition over palladium catalysts
A decomposiÃÃo do perÃxido de hidrogÃnio à uma reaÃÃo indesejÃvel no processo de sÃntese direta do H2O2 a partir do H2 e O2. Por outro lado, à uma reaÃÃo desejÃvel para a formaÃÃo dos radicais hidroxila (-OH) nos processos oxidativos avanÃados. Assim, à importante entender como as condiÃÃes do meio de reaÃÃo afetam a decomposiÃÃo do H2
Publicado em: 2008
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3. Evaluation of the chemical composition of the cell wall of transgenic tobacco plants (Nicotiana tabacum) that superexpress the gene ugdh, that codes for the enzyme UDPglucose dehydrogenase (EC 1.1.1.22) / Avaliação da composição química da parede celular de plantas de tabaco (Nicotiana tabacum) que superexpressam o gene ugdh de soja, que codifica a enzima UDP-glicose desidrogenase (EC 1.1.1.22)
The cellular elements that constitute the xylematic tissue of various plant species are widely used in diverse industrial sectors, with numerous applications, for example, the generation of energy and production of cellulose and paper. Plant cell walls are basically formed by cellulose, hemicellulose and lignin. The formation of cellulose and hemicellulose p
Publicado em: 2007
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4. Estudo da Adição do Promotor Cu aos Catalisadores Pt/Al2O3 e Pt/Nb2O5 para a Oxidação Seletiva de CO / Study of the Addition of Cu Promoter to the Pt/Al2O3 and Pt/Nb2O5 catalysts for the Selective Oxidation of CO
The fuel cells are an alternative to generate energy without polluting the environment. They produce electric energy through the reaction of hydrogen with the oxygen from air. The product of the reaction is water. It is an interesting form of generation energy because its a clean technology. The hydrogen used as combustible for the fuel cells is proceeding f
Publicado em: 2005
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5. Estudos microgravimétricos da deposição de cobre sobre eletrodos de cromo passivado.
Recently were obtained in our laboratory results indicating that Cu deposition on Cr2O3 happens in two steps: at the first one, there is the deposition of an amount smaller than one Cu monolayer, and at the second one there is Cu bulk deposition. Evidences show that the first step mechanism is UPD like, although it is necessary a deeper investigation. In thi
Publicado em: 2002
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6. Treonil-TRNA sintetase de germen de trigo : purificação e propriedades cineticas
Aminoacil - tRNA syntetases are enzymes that catalyse the first step of protein biosynthesis, the aminoacyl - tRNA formation. The substrates of the reaction are the L-aminoacid, ATP and tRNA, specific for this L-aminoacid. Magnesium ion parcipates as the cofactor of the reaction. The products of the reaction are aminoacyl - t.RNA, AMP and inorganic pyrophosp
Publicado em: 1991
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7. Protein disulfide isomerases exploit synergy between catalytic and specific binding domains
Protein disulfide isomerases (PDIs) catalyse the formation of native disulfide bonds in protein folding pathways. The key steps involve disulfide formation and isomerization in compact folding intermediates. The high-resolution structures of the a and b domains of PDI are now known, and the overall domain architecture of PDI and its homologues can be inferre
Oxford University Press.
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8. Enzymatic synthesis of oligonucleotides of defined sequence. Addition of short blocks of nucleotide residues to oligonucleotide primers.
Polynucleotide phosphorylase from Escherichia coli can be used to catalyse the addition of short tracts of deoxyadenylate residues to the 3'-termini of deoxyribooligonucleotides of the type pdAn-dN (where dN = dC, dT or dG) using dADP as donor. Similarly, the enzyme can also be used to catalyse the addition of short tracts of adenylate residues to the 3'-ter
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9. Rearrangement of structured RNA via branch migration structures catalysed by the highly related DEAD-box proteins p68 and p72
RNA helicases, like their DNA-specific counterparts, can function as processive enzymes, unwinding RNA with a defined step size in a unidirectional fashion. Recombinant nuclear DEAD-box protein p68 and its close relative p72 are reported here to function in a similar fashion, though the processivity of both RNA helicases appears to be limited to only a
Oxford University Press.
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10. RadA protein from Archaeoglobus fulgidus forms rings, nucleoprotein filaments and catalyses homologous recombination
Proteins that catalyse homologous recombination have been identified in all living organisms and are essential for the repair of damaged DNA as well as for the generation of genetic diversity. In bacteria homologous recombination is performed by the RecA protein, whereas in the eukarya a related protein called Rad51 is required to catalyse recombination and
Oxford University Press.
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11. Iron associated with asbestos bodies is responsible for the formation of single strand breaks in phi X174 RFI DNA.
The ability of amosite cored asbestos bodies isolated from human lungs to catalyse damage to phi X174 RFI DNA in vitro was measured and compared with that of uncoated amosite fibres with a similar distribution of length. Asbestos bodies (5000 bodies) suspended for 30 minutes in 50 mM NaCl containing 0.5 micrograms phi X174 RFI DNA, pH 7.5, did not catalyse d
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12. Properties of Photosynthetic Mutants Isolated from Euglena gracilis
Four different photosynthetic mutants of Euglena gracilis were characterized as to their lesions in photosynthetic electron transport. Two were defective around photosystem II: one, in electron transport on the oxidizing side of photosystem II, and the second lacked cytochrome 558. The location of the defect in the third mutant was concluded to be in the car