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Three bacterial isolates from soil, capable of degradation or transformation of nitroaromatic compounds and displaying a rod–coccus growth cycle, were studied by a polyphasic approach. On the basis of 16S rRNA sequence analysis and of chemotaxonomic characteristics, such as type A3α peptidoglycan with an interpeptide bridge Ala–Thr–Ala, the major menaquinone MK-9(H2) and fatty acid composition, the isolates were assigned to the genus Arthrobacter. DNA–DNA hybridization, riboprinting and phenotypic studies revealed that the three strains constitute a single species, distinct from phylogenetically neighbouring Arthrobacter aurescens and Arthrobacter ilicis. A novel species, Arthrobacter nitroguajacolicus sp. nov., with the type strain G2-1T (=CCM 4924T=DSM 15232T) is proposed.
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