title: Phylogenetic Diversity of Natural Populations of Ammonia Oxidizers Investigated by Specific PCR Amplification
authors.affiliation: Institute of Marine Sciences, University of California, Santa Cruz, Santa Cruz, CA 95064, USA
authors.initials: BB
authors.lastname: Ward
authors.initials: MA
authors.lastname: Voytek
authors.initials: K
authors.lastname: Witzel