Rubrivivax Gelatinosus
Mostrando 1-12 de 13 artigos, teses e dissertações.
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1. Controle da oxidação lipídica em ração para tilápia do Nilo
RESUMO: O objetivo deste trabalho foi avaliar o curso da rancidez oxidativa em rações de tilápia do Nilo contendo biomassa bacteriana de Rubrivivax gelatinosus . Foram aplicados seis tratamentos experimentais constituídos de ração basal (controle negativo), ração basal contendo astaxantina (controle positivo) e ração basal contendo quatro concentra
Cienc. Rural. Publicado em: 2016-09
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2. Desempenho, sanidade animal e qualidade de filés de tilápias alimentadas com ração suplementada com biomassa bacteriana
A aquicultura moderna é um dos setores de produção de alimentos que mais cresce no mundo. A tilápia, além de possuir grandes vantagens produtivas, origina produtos com grande aceitação pelo mercado. Em sua nutrição, podem ser utilizados aditivos com finalidades zootécnicas, pigmentantes ou antioxidantes. Este estudo objetivou avaliar o efeito da su
Arq. Bras. Med. Vet. Zootec.. Publicado em: 2016-04
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3. Biomassa de Rubrivivax gelatinosus na criação de frangos de corte: desempenho animal e cor dos produtos
A bactéria Rubrivivax gelatinosus tem sido utilizada experimentalmente no tratamento despoluente de efluentes industriais de abatedouros de aves e peixes, originando uma biomassa contendo pigmentos carotenoides, substâncias que possuem a capacidade de conferir cor aos alimentos e proteger contra reações oxidativas. Este trabalho teve por objetivo verific
Arq. Bras. Med. Vet. Zootec.. Publicado em: 2014-12
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4. Comparação entre a secagem por liofilização e atomização para produção de biomassa bacteriana
O uso de corantes em produtos de origem animal justifica-se pela melhora na cor dos alimentos, uma vez que este atributo é considerado um critério de qualidade. Estes aditivos podem ser produzidos utilizando efluentes industriais como substratos e organismos adequados, como Rubrivivax gelatinosus. Oxicarotenóides representam uma classe de carotenos, respo
Food Sci. Technol. Publicado em: 25/02/2013
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5. Natural Resistance to Inhibitors of the Ubiquinol Cytochrome c Oxidoreductase of Rubrivivax gelatinosus: Sequence and Functional Analysis of the Cytochrome bc1 Complex
Biochemical analyses of Rubrivivax gelatinosus membranes have revealed that the cytochrome bc1 complex is highly resistant to classical inhibitors including myxothiazol, stigmatellin, and antimycin. This is the first report of a strain exhibiting resistance to inhibitors of both catalytic Q0 and Qi sites. Because the resistance to cytochrome bc1 inhibitors i
American Society for Microbiology.
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6. High-resolution AFM topographs of Rubrivivax gelatinosus light-harvesting complex LH2
Light-harvesting complexes 2 (LH2) are the accessory antenna proteins in the bacterial photosynthetic apparatus and are built up of αβ-heterodimers containing three bacteriochlorophylls and one carotenoid each. We have used atomic force microscopy (AFM) to investigate reconstituted LH2 from Rubrivivax gelatinosus, which has a C-terminal hydrophobic extens
Oxford University Press.
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7. Regulation of Photosynthesis Genes in Rubrivivax gelatinosus: Transcription Factor PpsR Is Involved in both Negative and Positive Control
Induction of biosynthesis of the photosystem in anoxygenic photosynthetic bacteria occurs when the oxygen concentration drops. Control of this induction takes place primarily at the transcriptional level, with photosynthesis genes expressed preferentially under anaerobic conditions. Here, we report analysis of the transcriptional control of two photosynthesi
American Society for Microbiology.
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8. Rubrivivax gelatinosus acsF (Previously orf358) Codes for a Conserved, Putative Binuclear-Iron-Cluster-Containing Protein Involved in Aerobic Oxidative Cyclization of Mg-Protoporphyrin IX Monomethylester
This study describes the characterization of orf358, an open reading frame of previously unidentified function, in the purple bacterium Rubrivivax gelatinosus. A strain in which orf358 was disrupted exhibited a phenotype similar to the wild type under photosynthesis or low-aeration respiratory growth conditions. In contrast, under highly aerated respiratory
American Society for Microbiology.
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9. Characterization of the Oxygen Tolerance of a Hydrogenase Linked to a Carbon Monoxide Oxidation Pathway in Rubrivivax gelatinosus
A hydrogenase linked to the carbon monoxide oxidation pathway in Rubrivivax gelatinosus displays tolerance to O2. When either whole-cell or membrane-free partially purified hydrogenase was stirred in full air (21% O2, 79% N2), its H2 evolution activity exhibited a half-life of 20 or 6 h, respectively, as determined by an anaerobic assay using reduced methyl
American Society for Microbiology.
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10. Involvement of the C-Terminal Extension of the α Polypeptide and of the PucC Protein in LH2 Complex Biosynthesis in Rubrivivax gelatinosus
The facultative phototrophic nonsulfur bacterium Rubrivivax gelatinosus exhibits several differences from other species of purple bacteria in the organization of its photosynthetic genes. In particular, the puc operon contains only the pucB and pucA genes encoding the β and α polypeptides of the light-harvesting 2 (LH2) complex. Downstream of the pucBA ope
American Society for Microbiology.
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11. Genes Involved in the Biosynthesis of Photosynthetic Pigments in the Purple Sulfur Photosynthetic Bacterium Thiocapsa roseopersicina
A pigment mutant strain of the purple sulfur photosynthetic bacterium Thiocapsa roseopersicina BBS was isolated by plasposon mutagenesis. Nineteen open reading frame, most of which are thought to be genes involved in the biosynthesis of carotenoids, bacteriochlorophyll, and the photosynthetic reaction center, were identified surrounding the plasposon in a 22
American Society for Microbiology.
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12. Xantha-l encodes a membrane subunit of the aerobic Mg-protoporphyrin IX monomethyl ester cyclase involved in chlorophyll biosynthesis
Chlorophyll biosynthesis is a process involving ≈20 different enzymatic steps. Half of these steps are common to the biosynthesis of other tetrapyrroles, such as heme. One of the least understood enzymatic steps is formation of the isocyclic ring, which is a characteristic feature of all (bacterio)chlorophyll molecules. In chloroplasts, formation of the is
National Academy of Sciences.