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Abstract
“Alcaligenes denitrificans” Leifson and Hugh 1954 was not included in the Approved Lists of Bacterial Names and hence has no standing in bacteriological nomenclature. However, Alcaligenes faecalis DSM 30026 (“A. denitrificans” Leifson and Hugh 1954, type strain) has a DNA base composition of 69.1 ± 0.3 mol% G+C, whereas A. faecalis DSM 30030 (type strain) and A. faecalis DSM 30033 (“A. odorans” type strain) have 57.6 ± 0.5 and 55.3 ± 0.8 mol% G+C, respectively. DNA hybridization revealed homologies of 27% between A. faecalis DSM 30026T and strain DSM 30030T, 26% between A. faecalis DSM 30026T and strain DSM 30033T, but 71% between strains DSM 30030T and DSM 30033T. A yellow fluorescent pigment in King medium B was produced by A. faecalis strains DSM 30030T and DSM 30033T but not by strain DSM 30026T. Only A. faecalis DSM 30026T was able to grow with nitrate or nitrite as sole source of nitrogen and to reduce nitrate to nitrite and gas. All three strains reduced nitrite to gas, but an additional nitrogen source, e.g., ammonium ion, was necessary for the growth of strains DSM 30030T and DSM 30033T. In mineral media, the nitrate reduction to nitrite and gas has been shown to be reproducible. Based on the differences among A. faecalis DSM 30026 and both A. faecalis DSM 30030T and DSM 30033T, the revival of the name Alcaligenes denitrificans is herein proposed.
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