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Analyse bacteriologique de l'eau par mesure potentiometrique de la reduction de l'acide lipoique ArchiMer
Charriere, G; Jouenne, T; Junter, G.
A simple potentiometric technique to detect and enumerate the bio-indicators of water contamination is described. The technique consists in measuring the redox potential of a specific culture medium saturated with oxygen where bacteria are incubated in presence of lipoic acid (LA). These micro-organisms reduce LA to dihydrolipoic acid, giving rise to an important potential drop in the system. This potentiometric "signal" reveals the presence of active metabolic bacteria in the medium. The major assets of potentiometric measurements in presence of LA lies in the reliability and intelligibility of the results (the redox phenomenon being qualitatively and quantitatively studied), associated to a very simple technology. Futhermore, this technique is perfectly...
Tipo: Text Palavras-chave: Bacteria; Pollution indicators; Water quality; Microbial contamination; Indicator species; Pollution detection; Redox potential; Titration.
Ano: 1984 URL: http://archimer.ifremer.fr/doc/1984/acte-1007.pdf
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Analyse de l'Etain par Spectrophotometrie d'absortion atomique avec four ectrothermique. Application aux organismes marins ArchiMer
Thibaud, Yves.
The author presents an analysis technique permitting the determination of the tin in the tissues of marine organisms. This technique is only the application of the spectrophotometry of atomic absorption with atomization in the electrothermic oven. After the acid attack of the sample, the solution is put in a graphite oven to atomize the tin selectively and quantitatively. The detection limit obtained, 0,5 mu g/g of the lyophilized flesh is very satisfactory, to show the purport variations in shells from different origins.
Tipo: Text Palavras-chave: Marine organisms; Tin; Antifouling substances; Absorption spectra; Spectroscopic techniques; Pollution detection.
Ano: 1980 URL: http://archimer.ifremer.fr/doc/1980/publication-1906.pdf
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Características físicas, químicas y microbiológicas de las aguas marino costeras del área de Caleta Aeolian, Isla Baltra - Prov. de Galápagos, septiembre - 2006 OceanDocs
Gamboa, M.C..
El presente trabajo da a conocer las condiciones ambientales actuales en que se encuentran las aguas costeras en Caleta Aeolián de la Isla Baltra, a fin de contribuir a futuras investigaciones.
Tipo: Journal Contribution Palavras-chave: Chemical oceanography; Coastal waters; Nutrients (mineral); Petroleum hydrocarbons; Microbiology; Pollution detection; Chemical oceanography; Coastal waters; Microbiology; Http://aims.fao.org/aos/agrovoc/c_1516; Http://aims.fao.org/aos/agrovoc/c_25205; Http://aims.fao.org/aos/agrovoc/c_4800.
Ano: 2007 URL: http://hdl.handle.net/1834/2367
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Fluorescent antibody enumeration of Vibrio cholerae in the marine environment. ArchiMer
Brayton, P; Roszak, D; Palmer, L; Huq, S; Gimes, D.
From microcosm studies, V. cholerae and related potential human pathogens enter a viable but nonculturable state. Direct viable counts by epifluorescent microscopy consistently remain higher than corresponding plate counts. Thus, the assumption that pathogens "die-off" or "decay" in the marine environment must be re-evaluated, since stressed or nutrient-starved cells are unable to grow and be enumerated by standard plate count methods. Indirect immunofluorescent microscopy offers a more sensitive detection system for environment sampling for human pathogens. Field indicate that cultures positive for V. cholerae O1 are also positive by fluorescent antibody staining; however, the reverse was not necessarily true. By adapting epifluorescent techniques for...
Tipo: Text Palavras-chave: Vibrio cholerae; Bacteria; Experimental research; Marine environment; Pathogenic bacteria; Microbial contamination; Fluorescence microscopy; Bacterial counters; Pollution detection.
Ano: 1984 URL: http://archimer.ifremer.fr/doc/1984/acte-1000.pdf
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