Interactions between pyruvate and lactate metabolism in Propionibacterium freudenreichii subsp. shermanii: in vivo (super.13)C nuclear magnetic resonance studies

Article Abstract:

Propionibacterium freudenreichii subsp. shermanii and interactions in it between pyruvate and lactate metabolism in vivo have been studied using (super.13)C nuclear magnetic resonance. The propionic acid bacteria, especially P. freudenreichii supsp. shermanii are the main ripening flora of Swiss-type cheeses. The most important findings relate to lactate modification of fluxes of pyruvate metabolism. In two kinds of experiments, acetate synthesis and the Wood Werkman cycle were the most frequent metabolic pathways.

France, Usage, Physiological aspects, Cheese, Bacteria, Nuclear magnetic resonance, Dairy bacteriology, Swiss cheese, Propionic acid

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Sphingomonas alaskensis strain AFO1, an abundant oligotrophic ultramicrobacterium from the North Pacific

Article Abstract:

A strain of Sphingomonas alaskensis is described that was the most abundant bacterium in the ocean off Cape Muroto, Japan. It is less than 0.1 cubic micrometers in size and has also been found in Resurrection Bay, Alaska, and in the North Sea.

Reports, Plankton research

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Implications of rRNA operon copy number and ribosome content in the marine oligotrophic ultramicrobacterium Sphingomonas sp. strain RB2256

Article Abstract:

Research was conducted to investigate the implications of ribosome levels on the growth rate properties of RB2256. An analysis was made of rRNA operon copy numbers and the ribosome contents of cells that grow all throughout the growth phase and of cells in times of starvation of up to seven days. Results suggest that the bulk of the ribosome pool is not a requirement for protein synthesis and that ribosomes do not influence low growth rate.

Genetic aspects, Bacterial genetics, Operons, Ribosomal RNA, Ribosomes

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