Dihydroquinone
Mostrando 1-7 de 7 artigos, teses e dissertações.
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1. Estudo fitoquÃmico de plantas ativas contra o bicho mineiro do cafeeiro. / Phytochemical studies of plants active against the coffee leaf miner.
O bicho mineiro do cafeeiro causa grande prejuÃzo aos cafeicultores brasileiros pois ataca suas folhas diminuindo a sua produtividade. Em decorrÃncia, buscou-se contribuir para o desenvolvimento de mÃtodos de controle do referido inseto pelo estudo fitoquÃmico das folhas de duas plantas encontradas no estado de Minas Gerais, Geonoma schottiana Mart. e Ac
Publicado em: 2008
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2. Pathway of proton transfer in bacterial reaction centers: replacement of serine-L223 by alanine inhibits electron and proton transfers associated with reduction of quinone to dihydroquinone.
The pathway of proton transfer in the reaction center (RC) from Rhodobacter sphaeroides was investigated by site-directed mutagenesis. Ser-L223, a putative proton donor that forms a hydrogen bond with the secondary quinone acceptor QB, was replaced with Ala and Thr. RCs with Ala-L223 displayed reduced electron transfer and proton uptake rates in the reaction
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3. Chlorophenol Production by Anaerobic Microorganisms: Transformation of a Biogenic Chlorinated Hydroquinone Metabolite
Chlorinated hydroquinones of biological origin are fully dechlorinated to 1,4-dihydroquinone by anaerobic bacteria such as Desulfitobacterium spp. (C. E. Milliken, G. P. Meier, J. E. M. Watts, K. R. Sowers, and H. D. May, Appl. Environ. Microbiol. 70:385-392, 2004). In the present study, mixed microbial communities from Baltimore Harbor sediment and a pure c
American Society for Microbiology.
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4. Electron transfer flavoprotein from Methylophilus methylotrophus: properties, comparison with other electron transfer flavoproteins, and regulation of expression by carbon source.
When grown on methylated amines as a carbon source, Methylophilus methylotrophus synthesizes an electron transfer flavoprotein (ETF) which is the natural electron acceptor of trimethylamine dehydrogenase. It is composed of two dissimilar subunits of 38,000 and 42,000 daltons and 1 mol of flavin adenine dinucleotide. It was reduced by trimethylamine dehydroge
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5. Reduction of Fe(III), Cr(VI), U(VI), and Tc(VII) by Deinococcus radiodurans R1
Deinococcus radiodurans is an exceptionally radiation-resistant microorganism capable of surviving acute exposures to ionizing radiation doses of 15,000 Gy and previously described as having a strictly aerobic respiratory metabolism. Under strict anaerobic conditions, D. radiodurans R1 reduced Fe(III)-nitrilotriacetic acid coupled to the oxidation of lactate
American Society for Microbiology.
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6. Conformation of coenzyme pyrroloquinoline quinone and role of Ca2+ in the catalytic mechanism of quinoprotein methanol dehydrogenase
The ab initio structures of 2,7,9-tricarboxypyrroloquinoline quinone (PQQ), semiquinone (PQQH), and dihydroquinone (PQQH2) have been determined and compared with ab initio structures of the (PQQ)Ca2+, (PQQH)Ca2+, and (PQQH2)Ca2+ complexes as well as the x-ray structure of (PQQ)Ca2+ bound at the active site of the methanol dehydrogenase (MDH) of methylt
The National Academy of Sciences of the USA.
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7. Microbial Anaerobic Demethylation and Dechlorination of Chlorinated Hydroquinone Metabolites Synthesized by Basidiomycete Fungi
The synthesis and degradation of anthropogenic and natural organohalides are the basis of a global halogen cycle. Chlorinated hydroquinone metabolites (CHMs) synthesized by basidiomycete fungi and present in wetland and forest soil are constituents of that cycle. Anaerobic dehalogenating bacteria coexist with basidiomycete fungi in soils and sediments, but l
American Society for Microbiology.