Influence of freeze-thaw stress on the structure and function of microbial communities and denitrifying populations in soil

Article Abstract:

Microbial N(sub 2)O release during the course of thawing of soil was investigated in model experiment focusing on denitrification, since freeze-thaw is shown to cause significant physical and biological changes in soil, including a surge of N(sub 2)O and CO(sub 2). The results support the view that the flush of N(sub 2)O and CO(sub 2) is a result of increased microbial activity during the dynamic event of freeze and thaw, instead of mere entrapment of gases due to the freeze barrier.

Analysis, Polymerase chain reaction, Microbial populations, Denitrification

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Effects of various growth conditions in a chemostat on expression of virulence factors in Porphyromonas gingivalis

Article Abstract:

The effects of growth rate, medium and aeration on expression of major virulence factors and cellular proteins in Porphyromonas gingivalis ATCC 33277 in a chemostat are investigated. The results have shown P. gingivalis to actively control expression of several virulence factors to survive in the widely fluctuating oral environment.

Growth, Gram-negative bacteria, Membrane proteins, Periodontal disease, Periodontal diseases, Company growth, Chemical properties

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