Article Abstract:
A comparison of the nodulation in Phaseolus (P.) vulgaris induced by Rhizobium in two different Kenyan soils with pH 4.5 and 6.8 reveals that the bacteria are similar in nitrogen fixing capacity but different in composition of population. The bacteria in the Naivasha soil with a pH 6.8 possess four or more copies of the structural gene for nitrogenase, nifH, and are specific to a host range for nodulation. The Daka-ini soil bacteria has three copies of nifH but are specific only to P. vulgaris.
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Article Abstract:
A comparison of the cumulative amount of carbon dioxide respired by rhizobia in sterile bentonite-amended loamy sand and unamended loamy sand is discussed. Measurements were made over time by using various innoculum densities ranging from 1,000 to 10,000,000,000 per gram of dry soil. Vaiance analysis were performed for each sampling. It was found that the colonization of protective microhabitats were determined by pore shape, waterfilled pre system or by isolated pores.
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Article Abstract:
Microbiological research indicates that the free-living microorganism Rhizobium sp. (Cicer) strain CC 1192 exhibit condensation activity of acetyle-Coenzyme A acetyltransferase because they contain a specific acetyl-Coenzyme A to CoA ratio. Evidence suggests that the concentration of metabolic labile compounds affects the build up of poly-R-3-hydroxbutyrate reserves.
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