Consulta: subjectFacets:"Anoxic sediments"
Registros recuperados: 3
Data/hora: 03/06/2024 10:05:20

Metabolism of cyanobacteria in anaerobic marine sediments.
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Stal, L; Krumbein, W.
Two cyanobacteria isolated from marine microbial mats metabolized endogenous carbon reserves anaerobically in the dark. Microcoleus chthonoplastes reduced elemental sulfur to sulfide and Oscillatoria sp. additionally produced lactate in the absence of elemental sulfur. Under nitrogen fixing conditions, however, no sulfur reduction occurs. Lactate fermentation appeared to be the mechanism of anaerobic carbon degradation under these conditions. With a nitrogenase-reducible substrate, e.g. acetylene, added, lactate fermentation as well as sulfur reduction stops in cultures of Oscillatoria containing nitrogenase. In this case only ethylene production was observed. These cyanobacteria seem to possess the capability to carry out anaerobic dark metabolism...
Tipo: Text
Palavras-chave: Oscillatoria; Microcoleus chthonoplastes; Cyanophyta; Metabolism; Chemical cycles; Algae; Anoxic sediments; Anaerobic respiration; Algal mats; Biogeochemistry; Fermentation; Sulfur; Nitrogen fixation; Nitrogen cycle.
Ano: 1984
URL: http://archimer.ifremer.fr/doc/1984/acte-974.pdf

A laboratory model system for analysing microbial interactions occurring in anoxic estuarine sediments.
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Herbert, R; Keith, S.
Defined mixed populations of Clostridium butyricum, Desulfovibrio desulfuricans and Chromatium vinosum co-existed for long periods when grown in a single stage chemostat with glucose as sole carbon source. The nature and availability of the inorganic nitrogen source exerted a major effect on carbon flow in the experimental system. The data show that both the C. butyricum and D. desulfuricans isolates can utilise NO sub(3) as an e super(-)acceptor with an increase in cell yield. Under these growth conditions the free S super(2-) levels were lower resulting in more stable mixed populations. In addition the data show that the C. butyricum produces more oxidised fermentation end-products (acetate) when NO sub(3) super(-) was available and more reduced products...
Tipo: Text
Palavras-chave: Chromatium vinosum; Desulfovibrio desulfuricans; Clostridium butyricum; Biogeochemistry; Models; Bacteria; Detritus; Mineralization; Anoxic sediments; Estuarine sedimentation; Analytical techniques; Carbon cycle; Interspecific relationships; Microbiology.
Ano: 1984
URL: http://archimer.ifremer.fr/doc/1984/acte-947.pdf

Microbentos de las vías de agua alrededor de Guayaquil, durante mayo del 2001
Provedor de dados: Ocean Docs: e-repository of  publications
Autores: Gualancañay, E.
Se analiza el estudio de la microfauna bentónica y de la micro flora béntica del área de las vías de acceso de la ciudad de Guayaquil que comprende, el Río Guayas, Estero Salado, Canales del Morro y de Jambelí, Estero del Muerto y los puentes internos de la ciudad. La microfauna bentónica debido a la gran sedimentación y por las condiciones anóxicas del área al quedarse sepultados y/o fragmentados estuvieron ausentes en unos casos y en otros con representantes muy aislados. En cambio la microflora béntica tuvo una población más frecuente a pesar de la gran turbidez del área, sin embargo y debido a la gran cantidad de restos vegetales son llevados por las corrientes y de esta manera tiene la capacidad de renovar el oxígeno del agua muy vital para el...
Tipo: Journal Contribution
Palavras-chave: Benthos; Microorganisms; Anoxic sediments; Estuaries; Estuarine organisms; Benthos; Estuaries; Microorganisms; Http://aims.fao.org/aos/agrovoc/c_878; Http://aims.fao.org/aos/agrovoc/c_2673; Http://aims.fao.org/aos/agrovoc/c_4807.
Ano: 2002
URL: http://hdl.handle.net/1834/2258