Seasonal variations of virus abundance and viral control of the bacterial production in a backwater system of the Danube River

Article Abstract:

Viruses in the backwater system of the Danube river appear to infect approximately 5% to 21% of the bacteria in the system and control about 15% to 30% of bacterial production by killing the bacteria. Most of the bacteria that are infected are rods and vibrios. Viruses tended to decay more rapidly at temperature between 18 and 25 degrees Celsius than between 5 and 15 degrees Celsius. Variations in viral size and seasonal changes in bacterial mortality and infection are discussed.

Viruses, Aquatic microbiology, Danube River, Stream ecology

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Intracellular pH is a major factor in the induction of tolerance to acid and other stresses in Lactobacillus lactis

Article Abstract:

The acid tolerance response of Lactococcus lactis subsp cremoris was investigated in both induced and uninduced populations of the bacteria. Particular attention was given to the role of intracellular pH in the observed tolerance. Results indicate that acid induction pf Lactococcus results in cross-tolerance to other stresses. Further, even if the intracellular pH of induced and uninduced cells are equal, induced cells are better able to tolerate stresses.

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Development and testing of improved suicide functions for biological containment of bacteria

Article Abstract:

Experimental studies help develop efficient suicide functions for biological containment of bacteria, and the new single-plasmid suicide system surmounts the problems of mutation and mutant selection. Experimental studies in laboratory and in rat intestine demonstrate the efficiency of these suicide functions. Induction of suicide by isopropyl-beta-D-thiogalactopyranoside leads to significant suicide efficiency in soil and seawaters.

Soil microbiology

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