Survival of Azospirillum brasilense in the bulk soil and rhizosphere of 23 soil types

Article Abstract:

Twenty-three soil samples from different climatic regions were tested to study the effect of plants and abiotic soil factors on the growth and survival of Azospirillum brasilense. The bacteria was present in all the samples containing plant roots regardless of the soil type. However, if the soil samples did not contain any plants the CaCo3 content and the roughness of the soil inhibited the survival of the bacteria which soon died probably because the nutrients present in the soil finished. If the soil was disturbed by percolating water through it, the bacteria die faster.

Agricultural bacteriology, Bacteriology, Agricultural

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Transfer of streptomycin biosynthesis gene clusters within streptomycetes isolated from soil

Article Abstract:

A study was conducted to analyze the transfer of streptomycin biosynthesis gene clusters within streptomycetes isolated from soil. Two Escherichia coli strains were utilized for the streptomycin production assays. Results indicated that non-S. griseus-like isolates supported various parts of the streptomycin clusters. Findings also showed that the horizontal transfer of core biosynthetic pathways followed by posttransfer refinements correlated with diversity in secondary metabolic pathways.

Escherichia coli, Biosynthesis, Streptomycin

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Metabolism of benzene, toluene, and xylene hydrocarbons in soil

Article Abstract:

A study was conducted to analyze the metabolism of benzene, toluene and xylene (BTX) hydrocarbons in soil. Microtox toxicity assays were carried out on extracts of soil samples incubated with benzene, toluene and p-xylene mixtures. Total radiocarbon bound in the soil was then obtained using the web combustion of soil samples. Results indicated that xylenes are cometabolized in BTX mixtures applied to soil before being mineralized because of the diversity of soil microorganisms.

Benzene, Toluene, Hydrocarbon research, Xylene, Xylenes

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