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Ecological aspects of Bacillus thuringiensis in an Oxisol Scientia Agricola
Ferreira,Lessandra Heck Paes Leme; Suzuki,Marise Tanaka; Itano,Eiko Nakagawa; Ono,Mário Augusto; Arantes,Olívia Márcia Nagy.
Bacillus thuringiensis is a Gram positive, sporangial bacterium, known for its insecticidal habilities. Survival and conjugation ability of B. thuringiensis strains were investigated; vegetative cells were evaluated in non-sterile soil. Vegetative cells decreased rapidly in number, and after 48 hours the population was predominantly spores. No plasmid transfer was observed in non-sterile soil, probably because the cells died and the remaining cells sporulated quickly. Soil is not a favorable environment for B. thuringiensis multiplication and conjugation. The fate of purified B. thuringiensis toxin was analyzed by extractable toxin quantification using ELISA. The extractable toxin probably declined due to binding on surface-active particles in the soil.
Tipo: Info:eu-repo/semantics/article Palavras-chave: Population dynamics; Insecticidal crystal protein; Conjugation.
Ano: 2003 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162003000100004
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