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Showing 1 to 9 of 9 for “"Most probable number (MPN)"”.
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Degradation of tertiary butyl alcohol by a Pseudomonas sp. isolated from groundwater
… (50 ft. deep) at a petroleum refinery. The most probable number (MPN) of TBA degrading microorganisms was 4.9 x 10³ organisms/g (dry wt) of subsurface soil. Pristine subsurface soils, which did not have a history of petroleum contamination, had MPNs of < 2 TBA degrading organisms/g (dry wt) …
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An evaluation of a modified membrane filter procedure for enumerating stressed fecal coliforms in chlorinated sewage effluents
… fermentation technique that yields the most probable number (MPN), the standard MF technique (SF-MF), and a modified MF technique (IF-MF) which consisted of a lactose overlay and a 5-hour incubation period at 44.5°C. A statistical analysis of the data showed that the means of the …
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Quantifying Potential Sources of Microbial Contamination in Household Drinking Water Samples
… (www.idexx.com) defined substrate method for most probable number (MPN) of EC and TC per 100 mL of water. Of the 538 samples collected, 41% (n=221) were positive for TC and 10% (n=53) for EC. Chemical parameters were not statistically predictive of microbial contamination. Well depth, water …
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Characterization of redox conditions in a petroleum contaminated aquifer: Implications for bioremediation potential
… degrade BTEX, Fe-reduction did occur, and most probable number (MPN) counts showed that added Fe(III) increased numbers of Fe-reducers in the microcosms. Methane production in microcosms constructed from sediment near the source area was ~5 times lower than levels produced by the mid-plume …
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Isolation, growth and epidemiology of campylobacter jejuni / coli
… four other media showed that the SBA gave the most isolations and was the most selective. Enrichment culture using SBEB achieved additional isolations. The SBEB was used in a most probable number (MPN) method which detects as few as 10 campylobatters/tOO ml of water. A glass microfibre …
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Groundwater transport of Escherichia coli bacteria to open surface waters on Virginia's Coastal Plain: a GIS approach
… how much these factors affected the bacteria most probable number (MPN) concentration levels. Subsets of the data consisting of heavy rain events, low tide and high tide were analyzed which had geometric mean bacteria MPN concentrations of 16.1 fecal coliforms (FC) / 100 mL, 9.4 FC / 100 mL, …
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The effect of carbon addition, pH and Fe concentration of microbial sulfate reduction and the subsequent precipitation of Fe and Mn from acid mine drainage in wetland mesocosms
… the 18 month study period as determined by the Most Probable Number (MPN) method. The concentration of sulfate was decreased by an average of 360 mg/L as the AMD passed through the wetland. In a separate laboratory study, the effect of carbon addition, pH and Fe concentration on microbial …
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The role of heterotrophic microflagellates in plankton communities
… dominated the nanoplankton in the aphotic zone. Most Probable Number (MPN) estimation of the density of bacterivorous protozoa indicated that microflagellates were, on average, an order of magnitude more abundant than bacterivorous ciliates and amoebae. MPN and direct microscopical counts of …
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Βακτηριακή & ιογενής ρύπανση των οστρακοειδών
… 79,7%) βρέθηκαν να ανήκουν στην κατηγορία Α (MPN/100g σάρκας = <20 έως 220), δηλαδή χαρακτηρίζονται σαν δείγματα χαμηλής μόλυνσης, 25 δείγματα (ποσοστό 18,1%) βρέθηκαν να ανήκουν στην κατηγορία Β (MPN/100g σάρκας = 220 έως 3500), οπότε χαρακτηρίζονται σαν δείγματα μεσαίας μόλυνσης, ακατάλληλα …