B. Short-Answer Questions 1. In what ways is the membrane filter method for coli

Question

B. Short-Answer Questions 1. In what ways is the membrane filter method for coliform detection superior to the most probable number method (Exercise 44)? s more comeicted e xcavncs several daus to complete Also more ho How is the proper amount of water to be filtered determined? Why is this determination critical to the of use of tne est 2. outcome of the testing? 3. Besides pathogens that cause typhoid fever, cholera, and dysentery, what other pathogens would be indicated by the presence of coliforms? 329

Explanation / Answer

1. In the membrane filter method, there are separate confirmatory tests for the fecal coliforms as well as the total coliforms and the E. coli. Also, there are multiple filters or duplicates. Coliforms can be detected in 24 hours after filtration, by use of endo broth which saves time. The technique of mpn is time consuming along with being laborious as well as expensive and results may not always be what is desired. The filter technique gives better yield and is less expensive.

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