Genotypic and phenotypic analysis of zwittermicin A-producing strains of Bacillus cereus

Article Abstract:

A zwittermicin A-resistance gene was investigated using fatty acid analysis, RAPD analysis and PCR amplification to identify strains that produce zwittermicin A from other Bacillus cereus strains. According to results of a cluster analysis of the fatty acid methyl ester profiles, zwittermicin A producers grouped together in two clusters, apart from most non-producers. Like FAME, PCR analyses also distinguished B. cereus strains that produce zwittermicin A from other strains. It was also found that PCR with the primers designed to amplify zmaR is the most reliable method among those tested for the identification of zwittermicin A producers.

Analysis, Antibiotics, Bacillus cereus

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Genotypic analysis of Mycobacterium tuberculosis from medieval human remains

Article Abstract:

The DNA sequences of three medieval bone samples with osteological evidence of tuberculosis infection were found to be similar to those found in present-day Mycobacterium tuberculosis. This was gleaned from a series of polymerase chain reaction analyses of the medieval bone samples in which infection with a bacterium belonging to the Mycobacterium tuberculosis complex was identified. Spoligotyping provided further evidence of similarity between Mycobacterium tuberculosis isolates and the infective strain from the bone samples.

Bones, Tuberculosis, Mycobacterium tuberculosis, Polymerase chain reaction, Bacterial genetics, Anthropometry, Amino acid sequence, Amino acid sequencing

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Carbapenems as inhibitors of OXA-13, a novel, integron-encoded beta-lactamase in Pseudomonas aeruginosa

Article Abstract:

The induction of beta-lactamases confers resistance to beta lactam antibiotics on pathogenic bacteria. Pseudomonas aeruginosa is notorious for its antibiotic resistance because of the presence of a cephalosporinase gene in its genome making it naturally resistant to cephalotin and ampicillin. A clinical strain of P. aeruginosa has been found to contain an oxacillinase inhibited by imipenem.

Usage, Physiological aspects, Pseudomonas aeruginosa, Beta lactamases, Imipenem

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