Acidogenesis
Mostrando 1-9 de 9 artigos, teses e dissertações.
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1. Characteristics Physiochemical and Microbiology of the Leachate of the Controlled Landfill of Solids Wastes of Aguazinha/Olinda-PE / Monitoramento fÃsico-quÃmico e microbiolÃgico do lixiviado do aterro controlado de resÃduos sÃlidos urbanos de Aguazinha em Olinda PE
This research it approaches the study of the physiochemical characteristics and microbiology of those leachate produced starting from two cells of disposition of solid wastes of the Controlled Landfill of Aguazinha, located in the municipal of Olinda-PE. The study presents an approach about the characteristics of those leachate and contribution as subsidy to
Publicado em: 2008
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2. Processos ecotecnológicos no tratamento de efluentes líquidos de fecularia
A presente pesquisa avaliou o tratamento anaeróbio da manipueira em escala de bancada em um reator tipo calha, com fluxo horizontal, preenchida com calcário dolomítico (CAHC). Na primeira etapa foi determinado o tempo de detenção hidráulica (TDH) mais adequado para a operação da CAHC, dentre 4,6, 2,5, 1,3, 0,9 e 0,8 dias, com DQO aplicada de 3,5 g.L-
Publicado em: 2007
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3. Development of a Sensitive Gene Expression Reporter System and an Inducible Promoter-Repressor System for Clostridium acetobutylicum
A sensitive gene expression reporter system was developed for Clostridium acetobutylicum ATCC 824 by using a customized gusA expression cassette. In discontinuous cultures, time course profiles of β-glucuronidase specific activity reflected adequately in vivo dynamic up- and down-regulation of acidogenesis- and/or solventogenesis-associated promoter express
American Society for Microbiology.
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4. Inhibition of citric acid accumulation by manganese ions in Aspergillus niger mutants with reduced citrate control of phosphofructokinase.
Mutant strains of Aspergillus niger with reduced citrate control of carbohydrate catabolism (cic mutants) grow faster than the parent strain on media containing 5% (wt/vol) citrate. The mutants tolerated a higher intracellular citrate concentration than the parent strain. One mutant (cic-7/3) contained phosphofructokinase activity significantly less sensitiv
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5. Phosphotransbutyrylase from Clostridium acetobutylicum ATCC 824 and its role in acidogenesis.
Phosphotransbutyrylase (phosphate butyryltransferase [EC 2.3.1.19]) from Clostridium acetobutylicum ATCC 824 was purified approximately 200-fold to homogeneity with a yield of 13%. Steps used in the purification procedure were fractional precipitation with (NH4)2SO4, Phenyl Sepharose CL-4B chromatography, DEAE-Sephacel chromatography, high-pressure liquid ch
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6. Invasion and Killing of Human Endothelial Cells by Viridans Group Streptococci
Colonization of the cardiovascular endothelium by viridans group streptococci can result in infective endocarditis and possibly atherosclerosis; however, the mechanisms of pathogenesis are poorly understood. We investigated the ability of selected oral streptococci to infect monolayers of human umbilical vein endothelial cells (HUVEC) in 50% human plasma and
American Society for Microbiology.
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7. Physiological Events in Clostridium acetobutylicum during the Shift from Acidogenesis to Solventogenesis in Continuous Culture and Presentation of a Model for Shift Induction
The pH of continuous cultures of Clostridium acetobutylicum growing at pH 5.6 was allowed to decrease to 4.3 after acid production and thereby to shift the cultures from acetate and butyrate to acetone and butanol formation. Several parameters were determined during the shift. An increase in the intracellular acid concentration to 440 mM was recorded. An exc
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8. Identification, Detection, and Spatial Resolution of Clostridium Populations Responsible for Cellulose Degradation in a Methanogenic Landfill Leachate Bioreactor
An anaerobic landfill leachate bioreactor was operated with crystalline cellulose and sterile landfill leachate until a steady state was reached. Cellulose hydrolysis, acidogenesis, and methanogenesis were measured. Microorganisms attached to the cellulose surfaces were hypothesized to be the cellulose hydrolyzers. 16S rRNA gene clone libraries were prepared
American Society for Microbiology.
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9. Characterization and Development of Two Reporter Gene Systems for Clostridium acetobutylicum
The use of lacZ from Thermoanaerobacterium thermosulfurigenes (encoding β-galactosidase) and lucB from Photinus pyralis (encoding luciferase) as reporter genes in Clostridium acetobutylicum was analyzed with promoters of genes required for solventogenesis and acidogenesis. Both systems proved to be well suited and allowed the detection of differences in pro
American Society for Microbiology.