title: Enumeration of Autotrophic Ammonium-oxidizing Bacteria in Marine Waters by a Direct Method.
abstract: 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.
authors.affiliation: Department of Environmental Sciences, College of Agriculture and Environmental Science, Rutgers, the State University, New Brunswick, New Jersey 08903.
authors.forename: M S
authors.initials: MS
authors.lastname: Finstein