Purple Phototrophic Bacteria
Mostrando 1-12 de 30 artigos, teses e dissertações.
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1. Obtenção e caracterização filogenética de consórcio de bactérias púrpuras não-sulforosas consumidoras de ácidos orgânicos visando a produção de hidrogênio em reator anaeróbio de batelada / Obtaintion and phylogenetic characterization of consortium of phototrophic purple non-sulfur bacteria for hydrogen production from organic acids in the anaerobic batch reactor
The aim of this work was enrich a mixture of granular sludge of an up flow anaerobic sludge blanket (UASB) under anoxygenic phototrophic conditions. The techniques of molecular biology identified 17 operational taxonomic units (UTO) in the microbial consortium among the sequences analised, which were similar to Rhodobacter, genus widely cited in studies of h
Publicado em: 2009
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2. Avaliação de bactérias fototróficas em lagoas de estabilização: diversidade, purificação e identificação / Evaluation of phototropic bacteria in stabilization lagoons: diversity, purification and identification
The phototrophic bacteria frequently blossom in the stabilization lagoons that are used in sanitary sewer treatment, forming a purple layer on its surface. Therefore, the study of the conditions that propitiate such blooms, the microbial diversity, the removal of the organic matter and the establishment of the relations between them permit to understand the
Publicado em: 2007
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3. Evaluation of hydrogen production by purple non-sulfur phototrophic in batch reactor / Avaliação da produção de hidrogênio por bactéria fototrófica púrpura não-sulfurosa em reator em batelada
As necessidades de energia global são, na sua maioria, dependentes de combustíveis fósseis. Hidrogênio é uma energia limpa alternativa a esses combustíveis fósseis. Bactérias fototróficas produzem hidrogênio a partir de compostos orgânicos por meio de processo anaeróbio dependente de luz. Assim, este trabalho visou avaliar o efeito das concentra�
Publicado em: 2007
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4. Phototrophic purple and green bacteria in a sewage treatment plant.
In all purification stages of a biological sewage treatment plant, phototrophic bacteria were detected by the method of viable cell counts. The predominant species identified belonged to the genus Rhodopseudomonas of purple nonsulfur bacteria. The number of phototrophic bacteria was highest in wastewater containing sludge. In activated sludge, an average of
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5. Remarkable Diversity of Phototrophic Purple Bacteria in a Permanently Frozen Antarctic Lake
Although anoxygenic photosynthesis is thought to play an important role in the primary productivity of permanently frozen lakes in the Antarctic dry valleys, the bacterial communities responsible for this metabolism remain uncharacterized. Here we report the composition and activity of phototrophic purple bacteria in Lake Fryxell, Antarctica, as determined b
American Society for Microbiology.
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6. Oxidation of Dimethyl Sulfide to Dimethyl Sulfoxide by Phototrophic Purple Bacteria
Enrichment cultures of phototrophic purple bacteria rapidly oxidized up to 10 mM dimethyl sulfide (DMS) to dimethyl sulfoxide (DMSO). DMSO was qualitatively identified by proton nuclear magnetic resonance. By using a biological assay, DMSO was always quantitatively recovered from the culture media. DMS oxidation was not detected in cultures incubated in the
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7. Aerobic Anoxygenic Phototrophic Bacteria
The aerobic anoxygenic phototrophic bacteria are a relatively recently discovered bacterial group. Although taxonomically and phylogenetically heterogeneous, these bacteria share the following distinguishing features: the presence of bacteriochlorophyll a incorporated into reaction center and light-harvesting complexes, low levels of the photosynthetic unit
American Society for Microbiology.
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8. Photocatabolism of Aromatic Compounds by the Phototrophic Purple Bacterium Rhodomicrobium vannielii
The phototrophic purple non-sulfur bacterium Rhodomicrobium vannielii grew phototrophically (illuminated anaerobic conditions) on a variety of aromatic compounds (in the presence of CO2). Benzoate was universally photocatabolized by all five strains of R. vannielii examined, and benzyl alcohol was photocatabolized by four of the five strains. Catabolism of b
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9. Photosynthetic and Phylogenetic Primers for Detection of Anoxygenic Phototrophs in Natural Environments
Primer sets were designed to target specific 16S ribosomal DNA (rDNA) sequences of photosynthetic bacteria, including the green sulfur bacteria, the green nonsulfur bacteria, and the members of the Heliobacteriaceae (a gram-positive phylum). Due to the phylogenetic diversity of purple sulfur and purple nonsulfur phototrophs, the 16S rDNA gene was not an appr
American Society for Microbiology.
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10. Anaerobic bacteria from hypersaline environments.
Strictly anaerobic halophiles, namely fermentative, sulfate-reducing, homoacetogenic, phototrophic, and methanogenic bacteria are involved in the oxidation of organic carbon in hypersaline environments. To date, six anaerobic fermentative genera, containing nine species, have been described. Two of them are homoacetogens. Six species belong to the family Hal
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11. Carbon isotope fractionation by thermophilic phototrophic sulfur bacteria: evidence for autotrophic growth in natural populations.
Purple phototrophic bacteria of the genus Chromatium can grow as either photoautotrophs or photoheterotrophs. To determine the growth mode of the thermophilic Chromatium species, Chromatium tepidum, under in situ conditions, we have examined the carbon isotope fractionation patterns in laboratory cultures of this organism and in mats of C. tepidum which deve
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12. Anaerobic oxidation of ferrous iron by purple bacteria, a new type of phototrophic metabolism.
Anoxic iron-rich sediment samples that had been stored in the light showed development of brown, rusty patches. Subcultures in defined mineral media with ferrous iron (10 mmol/liter, mostly precipitated as FeCO3) yielded enrichments of anoxygenic phototrophic bacteria which used ferrous iron as the sole electron donor for photosynthesis. Two different types