Requirement for phosphoglucose isomerase of Xanthomonas campestris in pathogenesis of citrus canker

Article Abstract:

In the pathogenesis of citrus canker phosphoglucose isomerase (PGI) of Xanthomonas campestris is essential, based on a recent study. A mutant of S. campestris pv. citri, which causes the citrus canker, was induced by inserting the transposon Tn5tac1. The mutant did not grow or bring on the disease. It could still induce a hypersensitive response in a nonhost plant. The mutant could not grow on media with fructose or glycerol as the only carbon source. With other data from the study of a DNA fragment it can be seen that PGI is essential to the pathogenesis.

Physiological aspects, Bacteria, Phytopathogenic, Phytopathogenic bacteria, Molecular microbiology, Isomerases, Citrus canker

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Examination of fungi in domestic interiors by using factor analysis: correlations and associations with home factors

Article Abstract:

Factor analysis was used to evaluate correlations among airborne fungal populations in domestic interiors. The samples were collected from households in Topeka, KA, during the winter of 1987 to 1988. The factor structures were derived using the estimation method of principal component solution. These factors were used to determine the relationship between the fungal concentartions and questionnaire-derived information on home conditions and health synmptoms. The results were consistent with earlier study using univariate logistic regression analysis.

Analysis, Usage, Factor analysis, Discriminant analysis, Microbial populations

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Exposure of workers to airborne microorganisms in open-air swine houses

Article Abstract:

Studies on swine farms in Taiwan indicate no significant improvements in air quality management within open-air swine houses due to several waste-disposal issues. Gram-negative bacteria, airborne culturable bacteria, and fungi displayed high concentrations; causes include high pig density, infrequent cleaning, accumulation of water and no separation between pen floors and wastes.

Health aspects, Housing, Air pollution control, Swine, Air quality management, Pork industry, Airborne infection, Airborne infections

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