Variation in microbial biomass and community structure in sediments of eutrophic bays as determined by phospholipid ester-linked fatty acids

Article Abstract:

Phospholipid ester-linked fatty acids (PLFA) can be used as biomarkers to identify and quantify microbial biomass as they are essential components of microorganisms. A study of biomass distribution in Japan was conducted using Hiroshima Bay and Aki Nada as the study areas. Results of microbiological studies showed wide biomass distribution with the former havinghigher distribution than the latter. The extent of pollution in these areas were determined in proportion to PLFA content. The relatively low percentage offatty acid biomarkers in the study areas could be attributed to the existing environmental conditions and the extent of organic pollution.

Usage, Japan, Fatty acids, Ecological research, Biogeography, Lake sediments, Water acidification, Acid water pollution

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Influence of solid surface, adhesive ability, and inoculum size on bacterial colonization in microcosm studies

Article Abstract:

An investigation was conducted to determine the factors important for the bacterial colonization of biofilm surfaces. The procedure involved the inoculation of Pseudomonas fluorescens and Xanthomonas maltophila in simple and complex laboratory microcosms. The results showed that bacterial adhesiveness did not influence colonization success in both types of microcosms. Inoculum size appeared to be a more important factor in complex microcosms, although was not significant in simple ones. The model systems developed for the complex microcosm were not a good reflections of the complex natural system.

Bacteria, Bacterial adhesion, Colonization

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Changes in bacterial community structure in the colon of pigs fed different experimental diets and after infection with Brachyspira hyodysenteriae

Article Abstract:

Researchers used terminal restriction fragment length polymorphism of 16S ribosomal DNA to track changes in gastrointestinal bacteria in pigs under different diets. Some bacteria occurred always while others varied depending on the diet. Infection with the agent that causes swine dysentery also caused changes in bacterial communities.

Physiological aspects, Diet, Gastrointestinal system, Dysentery

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