Method for quantitative determination of serratia marcescens
A technology of Serratia marcescens and a quantitative detection method, which is applied in the field of detection of indicator bacteria for evaluating the protective performance of personnel biological protective equipment
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[0079] Quantitative detection of Serratia marcescens in freeze-dried samples
[0080] 1. Materials and methods
[0081] 1. The number of the standard strain of Serratia marcescens is ATCC8039; the sample to be tested is Serratia marcescens and the concentration range of the lyophilized sample is (0.87~1.27)×10 10 CFU / ml (developed by China Institute of Metrology); according to the composition of nutrient agar medium (beef extract 3.0g, peptone 5.0g, yeast powder 3.0g, sucrose 10.0g, agar powder 15.0g, distilled water 1000mL) to prepare the medium, Boil to dissolve, adjust the pH to 7.2±0.2, and autoclave at 121°C for 15 minutes. Heat to melt the agar before use, shake well and pour the plate.
[0082] 2. Take the freeze-dried sample to be tested out of the -20°C refrigerator, place it at room temperature for 5 minutes, add 2 mL of sterile phosphate buffer with a pipette as a diluent for rehydration and dissolution, mix well and prepare S 0 Sample homogenate. Then use a 1m...
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