Metabolic Characteristics of Beggiatoa alba in Thiosulfate Medium and Porcine Colon Contents

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The strain Beggiatoa alba DSM-1416 is a filamentous, gliding, colorless, sulfur bacterium. In order to get the basic information on deodorizing stinking odor in animal feeding, metabolizing characteristics of the strain were examined in the defined liquid medium and porcine colon medium. Carbon sources such as alcohols of low molecule (except methanol) and many short chained organic acids were positively utilized, but a number of saccharides were not utilized. Nitrogen sources such as ammonium salt and some amino acids (glutamate etc.) were positively utilized. In the liquid medium, acetate was utilized first even in the presence of thiosulfate. The thiosulfate was degraded to elemental sulfur and sulfite, and to sulfate ultimately. Also in the porcine centripetal colon medium, the cells of DSM-1416 could propagate. Hydrogen sulfide and methanethiol were utilized, which was not enough to deodorize the medium. In both media, the elemental sulfur stored in periplasm of the cells was gradually consumed by itself when carbon sources in the medium was exhausted. The phenomena demonstrated a possibility of disassimilating stinking odors remaining in animal intestine by sulfur bacteria.
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