11-Microbiology_Water_Mar12

Kills remaining microorganisms some are resistant

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Unformatted text preview: lia C. parvum 25 Brock Biology of Microorganisms, 13th Edi<on. Water quality control •  Impossible to check for all pathogens. Most water- borne pathogens are associated with fecal material. •  Test the water for organisms that are present in large numbers in feces – use these organisms as indicators of fecal pollu<on – if these organisms are present, there is a chance that the water may also contain pathogens. •  Two indicators: –  Coliforms: faculta<ve aerobic, Gram- nega<ve, non spore- forming, rod- shaped bacteria that can ferment lactose with gas forma<on within 48 hours at 35°C. Includes a variety of bacteria not all of intes<nal origin. –  Fecal coliforms: coliforms derived from the intes<nes of warm- blooded animals (can grow at 44.5°C, thermotolerant) •  The presence of fecal coliforms, especially E. coli, indicate fecal contamina<on an...
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