Term
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Definition
| rod-shaped, gram negative, non-spore forming organisms that ferment lactose w/ production of acid and gas when incubated at 35-37C (citrobacter, enterobacter, escherichia) |
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Term
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Definition
| a coliform bacteria which produces acid and gas, but FAILS TO FERMENT LACTOSE in 48 hrs. (salmonella, yersinia) |
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Term
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Definition
| measure of the suitability of water for a specific use base on physical, chemical, and biological parameters |
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Term
| microbial quality of water |
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Definition
| an assessment of the safety of water in respect to the possible transmission of waterborne infectious diseases |
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Term
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Definition
-to protect against giardia, viruses, legionella
-requires that all systems reduce level of giardia by 99.9% and virus by 99.99% |
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Term
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Definition
| to index potential of pathogens to be there in sufficient numbers when pathogens might possibly be present which could pose as possible risk |
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Term
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Definition
1. be absent from non-polluted water
2. present in fecal contaminated waters
3. be greater than enteric pathogen
4. density should be directly correlated w/ degree of fecal pollution
5. have equivalent or greater resistance to disinfectants than enteric pathogens |
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Term
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Definition
| all gram-negaive, nonspore-forming, facultative anaerobic bacilli that ferment lactose w/ gas production w/ 48 hrs at 35C |
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Term
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Definition
| have all characteristics of coliform group, but have the importance of being able to ferment lactose w/ gas production in 24 hrs at 44.5C |
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Term
| MPN method using 5-tube, 3-dilution setup |
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Definition
| accepted technique for fecal enumeration in water that uses A-1 as selective media |
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Term
| Potential Water Quality Indicators |
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Definition
1. Total coliform
2. Fecal coliform
3. E.coli
4. Enterococci |
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Term
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Definition
1. Lactose broth incubated for 24 hrs at 35C w/ positive result gas prod from fermentation
2. EC medium w/ MUG incubated for 24 hrs for 44C, gas prod is positive for presence of E.coli and fecal contamination |
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Term
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Definition
-survives better in aquatic environment
-salt tolerance up to 6.5% NaCl
-gram +, best for recreational and well-water quality |
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Term
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Definition
1. Bacteriophages
2. Salmonella and Shigella
3. Clostridium
4. Coprostanol |
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Term
| Most Probable Number (MPN) |
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Definition
-do not provide a direct measure of the bacterial count
-statistical approach to estimating the mean density of living orgs present in a given sample that are capable of multiplying in a given liquid medium
-determine total and fecal coliforms levels in water and wastewater |
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Term
| Multiple tube method (MPN method) |
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Definition
| -density of viable microbes is inferred from examining multiple tubes prepared from aliquots of a dilution series and determining the proportions of tubes that are positive for growth |
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Term
| Detection of Positive tubes (multiple tubes) |
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Definition
-turbidity
-metabolic end-products
-color changes in media
-gas prod |
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