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中國的_BOY木蟲 (著名寫手)
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[求助]
巴氏殺菌乳學(xué)的翻譯
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Pseudomonas spp. are common gram-negative, postpasteurization contaminants that contribute to spoilage of pasteurized dairy products. This study evaluated 5 common selective media for detecting Pseudomonas spp. in pasteurized milk. The performance of each selective medium for recovering 12 different Pseudomonas isolates (selected to represent a diversity of pasteurized milk isolates) was compared with that of standard plate count agar pour plates. Pseudomonasisolates showed varying abilities to produce colonies on different selective media. For 2 of 12 isolates, a 48-h incubation time was required for colony formation on any of the media tested. Violet red bile agar and coliform Petrifilm (3M, St. Paul, MN) were less effective than standard plate count agar pour plates at recovering Pseudomonas, regardless of incubation time, and MacConkey agar showed poor detection efficiency compared with SPCP after a 48-h incubation (R^2= 0.26). Therefore, the use of violet red bile agar, MacConkey agar, or coliform Petrifilm may not be sufficient for detecting common Pseudomonasspp. in milk. The methods showing the highest detection efficiencies were crystal violet tetrazolium agar (CVTA) pour plates (R^2= 0.95) and CVTA plates inoculated by spiral plating (R^2= 0.89) incubated at 32°C for 48 h. Overall, plating milk samples on CVTA followed by a 48-h incubation at 32°C was the most effective selective method for recovering a diversity of Pseudomonasspp. from milk. Key words: Pseudomonas, gram-negative , milk quality , post-pasteurization contamination |

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木蟲 (著名寫手)
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木蟲 (著名寫手)
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木蟲 (著名寫手)
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木蟲 (著名寫手)
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