Adhesion of Acinetobacter venetianus to diesel fuel droplets studied with in situ electrochemical and molecular probes

Article Abstract:

The adhesion mechanisms of a new n-alkane-degrading strain of Acinetobacter isolated from the Venice Lagoon and classified as Acinetobacter venetianus during the n-alkane degradation process were investigated. To this end, the adhesion mechanisms of Acinetobacter sp strain RAG-1 as the control strain and the newly isolated A venetianus VE-C3 were compared in terms of their physiological differences via molecular probes and confocal laser-scanning microscopy. Results demonstrated that VE-C3 cells, which have a hydrophilic capsule, can attach to the alkane droplet through the capsular polysaccharides (CPS). This conclusion negates other reports showing that CPS hinders attachment to hydrophobic solid surfaces.

Usage, Cell adhesion, Diesel fuels, Electrochemical analysis, Molecular probes

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Methylmercury resistance in Desulfovibrio desulfuricans strains in relation to methylmercury degradation

Article Abstract:

Two strains of Desulfovibrio desulfuricans, one of which synthesizes monomethylmercury from ionic mercury, were cultured to assess methylmercury toxicity and to compare the anaerobic strains of Clostridium pasteurianum. The CH3HgCl resistance of Desulfovibrio desulfuricans strains was 10 times that of Pseudomonas putida FB-1 and 100 times that of Clostridium pasteurianum. An insoluble, decomposable, white dimethyl mercury sulfide, (CH3Hg)2S, was produced in reaction to methyl mercury and hydrogen sulfide.

Measurement, Methylmercury, Methylmercury compounds, Anaerobic bacteria

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Heavy metal coprecipitation with hydrozincite [Zn(sub 5)(CO(sub 3))(sub 2)(OH)(sub 6)] from mine waters caused by photosynthetic microorganisms

Article Abstract:

The photosynthetic filamentous bacterium Scytonema sp. strain ING-1 and the microalgo Chlorella sp. strain SA1 are responsible for polishing heavy metals in mine waters by coprecipitating them with hydrozincite. This results in a white mineralized mat on the creek bed that contains high levels of lead, cadmium, nickel, copper and other metals.

Bioremediation, Contamination, Bacteria, Photosynthetic, Photosynthetic bacteria, Mine water

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