Sequential transhydroxylations converting hydroxyhydroquinone to phloroglucinol in the strictly anaerobic, fermentative bacterium Pelobacter massiliensis

Article Abstract:

Pelobacter massiliensis is a strictly anaerobic bacterium capable of utilizing hydroxyhydroquinone as sole carbon and energy source, converting it to phloroglucinol. In order to elucidate this reaction sequence, hyroxyhydorquinone was incubated with cell free extracts, and enzyme activities and products were assayed. The results showed that hydroxyhydroquinone undegoes a minimum of three consecutive transhydroxylation reactions characterized by transient accumulation of tetrahydrobenzene isomers.

Physiological aspects, Anaerobic bacteria, Hydroxylation

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Humic acid reduction by Propionibacterium freudenreichii and other fermenting bacteria

Article Abstract:

Various physiological groups of fermenting bacteria were studied to investigate their general capabilities to reduce humic acids. Findings showed that there are substantial changes towards more oxidized products in the fermentation product patterns of Propionibacterium freudenreichii, Lactococcus lactis and Enterococcus cecorum when humic acids were introduced as electron acceptors. For P. freudenreichii, even the fermentation end product propionate was oxidized when humic acids are present.

Fermentation, Humic acid, Humic acids

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pmoA based Analysis of methanotrophs in a littoral Lake sediment reveals a diverse and stable community in a dynamic environment

Article Abstract:

Diversity and community structure of aerobic methane-oxidizing bacteria in the littoral sediment of Lake Constance is investigated by cloning analysis and terminal restriction fragment length polymorphism (T-RFLP) fingerprinting of the pmoA gene. Phylogenetic analysis revealed a high-diversity of type I and type II methanotrophs in the oxygenated uppermost centimeter of the sediment.

Science & research, Risk factors, Methane, Microbiology, Bacteria, Aerobic, Aerobic bacteria, Genetic polymorphisms

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