A membrane filter method was developed for enumerating, in mixed populations, autotrophic nitrifying bacteria which transform ammonium to nitrite. It gave counts in good agreement with estimates obtained by using a most-probable-number procedure. Compared to the most-probable-number procedure, the membrane method is convenient and precise. A means of extending the sensitivity of the membrane method is presented.
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| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC547733 | PMC |
| http://dx.doi.org/10.1128/am.16.11.1646-1649.1968 | DOI Listing |
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