Membrane Filter Technique • Microbe Online | 合法醫療器材資訊網
Membrane filters have a known uniform porosity of predetermined size (generally 0.45 µm ) sufficiently small to trap microorganisms. Using the membrane filter technique, sample is passed through the membrane using a filter funnel and vacuum system. Any organisms in the sample are concentrated on the surface of the membrane.
The membrane, with its trapped bacteria, is then placed in a special plate containing a pad saturated with the appropriate medium. The passage of nutrients through the filter during incubation facilitates the growth of organisms in the form of colonies, on the upper surface of the membrane. Discrete colonies thus formed can be easily transferred to confirmation media.
Membrane filter technique is an effective, accepted technique for testing fluid samples for microbiological contamination. It involves less preparation than many...
Membrane Filter Technique • Microbe Online | 合法醫療器材資訊網
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