Plasmid transfer between marine Vibrio strains during predation by the heterotrophic microflagellate Cafeteria roenbergensis

Article Abstract:

The combined effect of nutrient release and provision of particles along with other factors causes the increase in plasmid transfer between marine Vibrio strains during predation by the heterotrophic microflagellates. The activity of grazing flagellates, Cafeteria roenbergensis, leads to the significant increase in plasmid transfer. This occurs due to a localized increase in bacterial numbers through filter feeding, resulting in increased possibility for cell-to-cell contact for high cell densities and plasmid transfer.

Plasmids, Microbiology, Flagella (Microbiology), Flagella, Marine sediments

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Inhibition of settlement by larvae of Balanus amphitrite and Ciona intestinalis by a surface-colonizing marine bacterium

Article Abstract:

The supernatant from a marine bacterial isolate D2 contained a substance that inhibits the settlement and kills the barnacle (Balanus amphitrite) and ascidian larvae (Ciona intestinalis). The inhibitory bacterium, isolated from the surface of an adult C. intestinalis, produced an extracellular low-molecular-weight component that was heat stable, polar and neutral. It was neither a protein nor a peptide, but either contained or bound to carbohydrate moieties. Metaperiodate treatment increased its toxicity to the larvae.

Environmental aspects, Marine bacteria, Larvae, Marine invertebrates

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Survival, stress resistance, and alterations in protein expression in the marine Vibrio sp. strain S14 during starvation for different individual nutrients

Article Abstract:

The effect of nutrient starvation on survival, protein and RNA synthesis of marine Vibrio species was investigated. Depletion of carbon, nitrogen or phosphorus and simultaneous starvation with these nutrients were conducted on Vibrio strain S14 cultures. Resuls showed that the cells under carbon- and multiple-nutrient starvation manifested long-term starvation resistance with increased production of starvation stimulons. Increased resistance to heat, cadmium chloride and ultraviolet radiation were also observed.

Physiological aspects, Bacterial proteins, Vibrio, Starvation

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