Induction of melanin biosynthesis in Vibrio cholerae

Article Abstract:

The relationships between virulence and melanogenesis in Vibrio cholerae in regard to the physical and nutritional factors inducing their expression were investigated. The results showed that melanogenesis was induced in response to hyperosmotic stress in conjunction with elevated growth temperatures. These stressful conditions promoted a concomitant decrease in extracellular toxin levels. However, no significant correlation was detected between pigment production and virulence factors. It is proposed that melanogenesis performs a specific survival function in response to stressful situations.

Vibrio cholerae, Virulence (Microbiology), Melanin

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Microbial transformation of deoxynivalenol (vomitoxin)

Article Abstract:

An evaluation of sources of microbial culture capable of transforming vomitoxin is discussed. The in vitro transformation of deoxynivalenol was tested on the microbial inocula from rumenfluid, soil, contents of large intestines of chickens (CLIC) and of swine (SLIC). Results indicate that CLIC completely transformed pure vomitoxin, SLIC produced no alteration of the toxin, rumen culture metabolized 35% and 50% by the soil sample.

Analysis, Mycotoxins

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Strain selection in carbon-limited chemostats affects reproducibility of Thermoanaerobacter ethanolicus fermentations

Article Abstract:

The fermentation characteristics of Thermoanaerobacter ethanolicus strains showed improved trial reproducibility after chemostat adaptation. Changes in environmental conditions did not affect chemostat fermentation patterns but affected genotypic changes brought about byculture selection.

Usage, Cultures (Biology), Anaerobic bacteria, Chemostat, Industrial microorganisms

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