Quantitative PCR method for sensitive detection of ruminant fecal pollution in freshwater and evaluation of this method in alpine karstic regions |
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Authors: | Reischer Georg H Kasper David C Steinborn Ralf Mach Robert L Farnleitner Andreas H |
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Institution: | Institute for Chemical Engineering, Gene Technology Group, Vienna University of Technology, Getreidemarkt 9-166/5, A-1060 Vienna, Austria. |
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Abstract: | A quantitative TaqMan minor-groove binder real-time PCR assay was developed for the sensitive detection of a ruminant-specific genetic marker in fecal members of the phylum Bacteroidetes. The qualitative and quantitative detection limits determined were 6 and 20 marker copies per PCR, respectively. Tested ruminant feces contained an average of 4.1 x 10(9) marker equivalents per g, allowing the detection of 1.7 ng of feces per filter in fecal suspensions. The marker was detected in water samples from a karstic catchment area at levels matching a gradient from negligible to considerable ruminant fecal influence (from not detectable to 10(5) marker equivalents per liter). |
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