title: [Nitrogen utilization and xanthan production by Xanthomonas campestris].
abstract: In media with mixed nitrogen sources (nitrate plus yeast extract) a three auxic growth is observed. The first growth phase is characterized by preferential utilization of the amino acids of the yeast autolysate and the utilization of only small amounts of nitrate. During the second growth phase nitrate is preferentially utilized. In the third phase there is only growth without dividing of cells and the accumulation of xanthan takes place. The change from growth by dividing to growth without dividing means a change from balanced to unbalanced growth. It is proposed that xanthan production is connected with unbalanced growth.
mesh_terms: D000596:Amino Acids / Q000378:metabolism; D001426:Bacterial Proteins / Q000096:biosynthesis; D009566:Nitrates / Q000378:metabolism; D009584:Nitrogen / Q000378:metabolism*; D011135:Polysaccharides, Bacterial / Q000096:biosynthesis*; D014974:Xanthomonas / Q000254:growth & development / Q000378:metabolism*
chemical_list: D000596:Amino Acids; D001426:Bacterial Proteins; D009566:Nitrates; D011135:Polysaccharides, Bacterial; D009584:Nitrogen
vernacular_title: Stickstoffverwertung und Xanthanbildung bei Xanthomonas campestris.