We looked at the diversity of [NO(2)](-) oxidizers at field scale by examining isolates at clump scale and in microsamples of soil (diameter, 50 microm). The genetic distances (as determined by amplified ribosomal DNA restriction analysis performed with Nitrobacter-specific primers) in a small clump of soil were as large as those between reference strains from large geographical areas. Diversity in individual microsamples was shown by serotyping.
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Grundmann et al. (2000) studied this question.
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