Beta-cyanoalanine production by marine bacteria on cyanide-free medium and its specific inhibitory activity toward cyanobacteria

Article Abstract:

Results demonstrate that most marine bacteria are capable of producing anticyanobacterial substances in the absence of cyanide ion in the culture medium. Data reveal that purified anticyanobacterial substance is a beta-cyano-L-alanine.

United States, Japan, Statistical Data Included, Antibacterial agents, Structure-activity relationships (Pharmacology)

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Intracellular changes in ions and organic solutes in halotolerant Brevibacterium sp. strain JCM 6894 after exposure to hyperosmotic shock

Article Abstract:

Intracellular responses in hyperosmotic shock in the halotolerant organism Brevibacterium sp. strain JCM 6894 were investigated. The cells exhibited different responses to shocks in fresh culture medium and in old culture medium. In fresh culture medium, growth was stimulated and the medium became more acidic while in the old medium, growth was repressed and the medium became more alkaline. Cells in fresh culture transiently accumulated alanine and glutamine in response to the shock.

Bacteria, Osmosis, Shock

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Whole-cell immunolocalization of nitrogenase in marine diazotrophic cyanobacteria, Trichodesmium spp

Article Abstract:

The aerobic fixing of N2 during photosynthesis without heterocysts by the marine cyanobacteria genus Trichodesmium has been studied by devising an immunofluorescence technique coupled to light microscopy. The cyanobacteria is immunolabeled and the distribution patterns of nitrogenase and other proteins are then examined and measured. It has been observed that cell differentiation occurs in Trichodesmium and only a small number of cells have the ability to fix nitrogen. The N2-fixing cells also have diminished photosynthetic activity.

Nitrogenase, Nitrogen-fixing microorganisms

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