The Determination of the Presence of Coliform Bacteria from Selected Sources by Means of the Most Probable Number MPN Method essays

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The Determination of the Presence of Coliform Bacteria from Selected Sources by Means of the Most Probable Number MPN Method Coliform bacteria are good indicator organisms for the presence of pathogenic bacteria due to their realtionship with these pathogenic bacteria, their relative ease of determination by simple methods, and by their occurrence in large quantities in human feces. The MPN method used in this experiment is one of the prescribed techniques for the determination of these coliform bacteria from the Standard Methods for the Examination of Water and Wastewater as prescribed by the EPA. It consists of three stages, each of which necessitates a positive result for the previous stage. The first stage (presumptive test) determines the gas-producing coliform characteristic during lactose-fermentation. The second stage (confirmed test), determines the gram-reaction and also the lactose fermentation abilities of the organism, while the last stage (completed test) determines the endospore presence to determine if the organisms in the sample indeed are coliforms. The number of coliforms or bacteria present is readily seen with the use of a special table and then the statistically estimated numbers are determined. The samples, however, did not produce positive results for the presence of coliforms. Enventhough there was a large Some common words found in the essay are: EMB MacConkey, Lower Upper, Introduction Human, Gram Staining, Presumptive Test, Frank MPN, Enterobacter NCSU, Endospore Staining, Washington DC, Water Wastewater, coliform bacteria, test tubes, confirmed test, macconkey agar, tap water, indicator organisms, 1 0, lactose fermentation, tubes gas, durham tubes, 2 oct 1999, macconkey agar plates, colonies macconkey agar, inside durham tubes, presence coliform bacteria, Approximate Word count = 2944 Approximate Pages = 12 (250 words per page double spaced)
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