Spatiotemporal distribution of marine magnetotactic bacteria in a seasonally stratified coastal salt pond

Article Abstract:

The changes in the marine magnetotactic bacteria (MB) population structure and water chemistry in Salt Pond during summer 2002 are described. The presence of a novel, greigite-producing rod in the sulfidic hypolimnion was identified in relatively constant abundance over the course of the season. This is the first MB that appears to be a member of gamma-Proteobacteria, which suggests an iron-rather than sulfur-based respiratory metabolism, and its distribution and phylogenetic identity indicates that an alternative model for the ecological and physiological role of magnetotaxis is needed for greigite-producing MB.

Water chemistry, Microbiological research

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New chitosan-degrading strains that produce chitosanases similar to ChoA of Mitsuaria chitosanitabida

Article Abstract:

An estimated 67 chitosan-degrading strains were identified by screening and their physiological and biological characteristics were investigated to examine the phylogenetic distribution of chitosanases analogous to ChoA in nature. Analysis reveals that these chitosanases are widely distributed in the beta and gamma subclasses of the Proteobacteria and the Flavobacterium group in nature.

Chitin

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Evidence for autotrophy via the reverse tricarboxylic acid cycle in the marine magnetotactic coccus strain MC-1

Article Abstract:

Strain MC-1 grows chemolithotrophically using sulfide and thiosulphate as electron donors. Strain MC-1 cell extracts showed activities for several key enzymes of the reverse (reductive) tricarbolic acid (rTCA) cycle showing that MC-1 appears to be the first known representative of the Greek small letter alpha-Proteobacteria to use the rTCA cycle for autotrophy.

Genetic aspects, Marine bacteria, Autotrophs, Krebs cycle

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