Vibrio Fischeri
Mostrando 25-36 de 162 artigos, teses e dissertações.
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25. Avaliação ecotoxicológica de efluentes de celulose branqueada de eucalipto ao longo do tratamento biológico / Ecotoxicology assessment of bleached eucalipt pulp mill efluents in the biological treatment
O presente estudo teve como objetivo avaliar a toxicidade de efluentes de celulose branqueada de eucalipto. Inicialmente foi feita uma caracterização físicoquímica das amostras, em diferentes pontos ao longo do tratamento, e posteriormente para estes mesmos pontos foi avaliada a toxicidade com quatro organismos-teste: para toxicidade aguda: a) Vibrio fis
Publicado em: 2008
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26. Ensaios de toxicidade empregados na avaliação de efeitos no sistema de tratamento de esgotos e efluentes, ETE Suzano, e seu entorno, utilizando organismos aquáticos / TOXICITY ASSAYS APPLIED FOR THE EVALUATION OF THE EFFECTS OF SUZANO WASTEWATER TREATMENT SYSTEM, ETE SUZANO, AND ITS SURROUNDINGS, USING AQUATIC ORGANISMS
A Estação de Tratamento de Esgotos de Suzano, ETE Suzano, localizada em Suzano, recebe efluentes e esgotos domésticos de cinco municípios que concentram forte atividade industrial. A região merece estudos que visem à preservação do rio tendo em vista sua proximidade à nascente do mesmo, além da importância para o estado de São Paulo. O objetivo d
Publicado em: 2008
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27. Testes de toxicidade aguda através de bioensaios no extrato solubilizado dos resíduos classe II A - não inertes e classe II B - inertes
A grande diversidade de substâncias potencialmente tóxicas contribuem para a deterioração do meio ambiente. O objetivo deste trabalho foi propor a utilização de bioensaios, através de testes de toxicidade aguda com Daphnia magna e Vibrio fischeri, como mais um parâmetro a ser analisado no extrato solubilizado dos resíduos que, segundo a NBR 10004/04
Engenharia Sanitaria e Ambiental. Publicado em: 2007-03
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28. Aplicabilidade dos Testes de Toxicidade Aguda com Daphnia magna e Vibro fischeri no monitoramento da qualidade das Ãguas de bacias hidrogrÃficas: Caso do Rio Ipojuca em Pernambuco
The water quality evaluation described by the Resolution NÂ 357/05 of National Council of Environmental (CONAMA), that revoked the NÂ 20/86, established that the Environmental Agencies measured the water quality through physical, chemical, biological analysis and chronic and acute toxicities tests. By these testes is possible to know the toxic effect of su
Publicado em: 2006
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29. Avaliação da toxicidade de fluidos de usinagem através da ecotoxicologia aquática / Evaluation of the toxicity of fluids employed in the metallic tool industrial machining using aquatic ecotoxicology
Ecotoxicological analyses have being used to monitor environmental samples, industrial effluents and complex substances. With the objective to analyze the toxicity of cutting fluids used in the machinery industry, acute toxicity test with species of three different throphic levels: Vibrio fischeri, Daphnia similis, Daphnia laevis e Danio rerio, were performi
Publicado em: 2006
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30. Padronização de um teste de toxicidade crônica com a bactéria luminescente Vibrio fischeri para análise de qualidade de águas superficiais
Biotoxicity assays are experiments, in which living organisms are put into several samples and their reactions are observed. The luminescent bacteria Vibrio fischeri is known and used in acute toxicity tests. Its handling is practical and safe, being fast and efficient. The main objective of this work was to standardize the reactivation solution used for the
Publicado em: 2004
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31. The light organ symbiont Vibrio fischeri possesses a homolog of the Vibrio cholerae transmembrane transcriptional activator ToxR.
A cross-hybridizing DNA fragment to Vibrio cholerae toxR was cloned from the nonpathogenic light organ symbiont Vibrio fischeri, and three proteins homologous to V. cholerae ToxR, ToxS, and HtpG were deduced from its DNA sequence. V. fischeri ToxR was found to activate a V. cholerae ToxR-regulated promoter, and an antiserum raised against the amino-terminal
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32. Identification of the genes encoding NAD(P)H-flavin oxidoreductases that are similar in sequence to Escherichia coli Fre in four species of luminous bacteria: Photorhabdus luminescens, Vibrio fischeri, Vibrio harveyi, and Vibrio orientalis.
Genes encoding NAD(P)H-flavin oxidoreductases (flavin reductases) similar in both size and sequence to Fre, the most abundant flavin reductase in Escherichia coli, were identified in four species of luminous bacteria, Photorhabdus luminescens (ATCC 29999), Vibrio fischeri (ATCC 7744), Vibrio harveyi (ATCC 33843), and Vibrio orientalis (ATCC 33934). Nucleotid
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33. Dominance of Vibrio fischeri in Secreted Mucus outside the Light Organ of Euprymna scolopes: the First Site of Symbiont Specificity
Previous studies of the Euprymna scolopes-Vibrio fischeri symbiosis have demonstrated that, during colonization, the hatchling host secretes mucus in which gram-negative environmental bacteria amass in dense aggregations outside the sites of infection. In this study, experiments with green fluorescent protein-labeled symbiotic and nonsymbiotic species of gra
American Society for Microbiology.
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34. Vibrio fischeri σ54 Controls Motility, Biofilm Formation, Luminescence, and Colonization
In this study, we demonstrated that the putative Vibrio fischeri rpoN gene, which encodes σ54, controls flagellar biogenesis, biofilm development, and bioluminescence. We also show that rpoN plays a requisite role initiating the symbiotic association of V. fischeri with juveniles of the squid Euprymna scolopes.
American Society for Microbiology.
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35. Complete genome sequence of Vibrio fischeri: A symbiotic bacterium with pathogenic congeners
Vibrio fischeri belongs to the Vibrionaceae, a large family of marine γ-proteobacteria that includes several dozen species known to engage in a diversity of beneficial or pathogenic interactions with animal tissue. Among the small number of pathogenic Vibrio species that cause human diseases are Vibrio cholerae, Vibrio parahaemolyticus, and Vibrio vulnificu
National Academy of Sciences.
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36. Chemoattraction of Vibrio fischeri to Serine, Nucleosides, and N-Acetylneuraminic Acid, a Component of Squid Light-Organ Mucus
Newlyhatched juveniles of the Hawaiian squid Euprymna scolopes rapidly become colonized by the bioluminescent marine bacterium Vibrio fischeri. Motility is required to establish the symbiotic colonization, but the role of chemotaxis is unknown. In this study we analyzed chemotaxis of V. fischeri to a number of potential attractants. The bacterium migrated to
American Society for Microbiology.