Acidogenic Fermentation
Mostrando 1-8 de 8 artigos, teses e dissertações.
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1. ProduÃÃo de Ãcidos graxos volÃteis por biodigestÃo anaerÃbia da manipueira / Production of volatile fatty acids by anaerobic biodigestion of manipueira
The cultivation of cassava extends throughout Brazil because of its excellent adaptation to different soils and climatic conditions. Our country occupies the second position at the worldwide ranking in cultivating this plant (15% of the world production). The industrial processing of cassava generates a liquid waste, the so called manipueira, considered as a
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 24/02/2011
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2. Proposta de metodologia para determinação da atividade hidrogênica específica
Hydrogen production by fermentation process is influenced by the concentration and characteristics of organic substrate, the effluent pH value and biomass concentration. The determination of specific hydrogenic activity of organic substrates and biomass can be a tool to analyze the hydrogen volume produced during the fermentation, the volatile fatty acids pr
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 2010
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3. Evaluation of phenotypic traits of cariogenicity of Strptococcus Mutans genotypes isolated from dental biofilm / Avaliação de caracteristicas fenotipicas de cariogenicidade de genotipos de Strptococcus Mutans isolados de biofilme dental
Mutans streptococci, mainly Streptococcus mutans, are considered as the main microorganisms related to dental caries. These microorganisms are present in oral cavity as distinct genotypes, which may show distinct phenotypic traits. In this context, it was evaluated the S. mutans genotypic diversity in dental biofilm formed in vivo and in situ during 3 days u
Publicado em: 2010
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4. Produção de hidrogênio e ácidos orgânicos por fermentação acidogênica em reator anaeróbio de leito fluidificado / Hydrogen and volatile fatty acids production by acidogenic fermentation in anaerobic fluidized bed reactor
A matéria orgânica presente nas águas residuárias representa uma matéria prima barata para integrar o processo de digestão anaeróbia e gerar fontes de energia alternativas, como o hidrogênio. O hidrogênio pode substituir os combustíveis fósseis não renováveis e diminuir as emissões de gases do efeito estufa responsável por grande parte da muda
Publicado em: 2008
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5. Produção de ácidos graxos voláteis por fermentação acidogênica em reator anaeróbio de leito fixo e extração em resina de troca iônica e com solvente orgânico / Volatile fatty acids production by acidogenic fermentation in an anaerobic immobilized biomass reactor and extraction with ionic change resin and organic solvent
Nesse trabalho utilizou-se o reator anaeróbio horizontal de leito fixo (RAHLF) para produção de ácidos graxos voláteis (AGVs). O reator, com volume total de 2,38 litros, foi preenchido com partículas de argila expandida e alimentado com substrato sintético à base de glicose. Com concentração de glicose de 2000 mg/L, sem adição de alcalinizante e
Publicado em: 2005
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6. Cloning, sequencing, and expression of genes encoding phosphotransacetylase and acetate kinase from Clostridium acetobutylicum ATCC 824.
The enzymes phosphotransacetylase (PTA) and acetate kinase (AK) catalyze the conversion of acetyl coenzyme A to acetate in the fermentation of Clostridium acetobutylicum. The acetate-producing step is an important element in the acidogenic fermentation stage and generates ATP for clostridial cell growth. The genes pta and ack, encoding PTA and AK, respective
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7. Purification and properties of the inducible coenzyme A-linked butyraldehyde dehydrogenase from Clostridium acetobutylicum.
The coenzyme A (CoA)-linked butyraldehyde dehydrogenase (BAD) from Clostridium acetobutylicum was characterized and purified to homogeneity. The enzyme was induced over 200-fold, coincident with a shift from an acidogenic to a solventogenic fermentation, during batch culture growth. The increase in enzyme activity was found to require new protein synthesis s
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8. Production of Solvents by Clostridium acetobutylicum Cultures Maintained at Neutral pH
The formation of acetone and n-butanol by Clostridium acetobutylicum NCIB 8052 (ATCC 824) was monitored in batch culture at 35°C in a glucose (2% [wt/vol]) minimal medium maintained throughout at either pH 5.0 or 7.0. At pH 5, good solvent production was obtained in the unsupplemented medium, although addition of acetate plus butyrate (10 mM each) caused so