Article Abstract:
Gram-positive bacterium Listeria monocytogenes develop acid tolerance under conditions of sublethal acid stress by a mechanism termed as acid tolerance response (ATR). However, cells first undergo a period of maximal acid resistance at pH values ranging from 4-6 prior to the development of acid tolerance. Expression of ATR involves the activation of certain genes encoding a variety of proteins. L. monocytogenes also exhibits ATR during the stationary phase upon exposure to acid stress, but the mechanism is independent of pH.
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Article Abstract:
A comparison of the conjugation systems of F plasmid from Escherichia coli and plasmid pCF10 from Enterococcus faecalis using data from the aggregation-mediated conjugation system encoded from Bacillus thuringiensis' pXO16 reveals a number of common characteristics despite the obvious basic differences. One common characteristic shared by the two plasmids include their ability to sustain highly efficient conjugative transfers in a liquid environment.
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Article Abstract:
Results show that the overproduction of the low-affinity penicillin-binding protein PBP4 in Enterococcus faecalis JH2-2r can be ascertained by an intense benzylpenicillin labeling of PBP4 in JH2-2r compared to other strains. PBP4 overproduction is due to a modification of an unidentifiable factor other than psr-like gene.
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