Bactéries hétérotrophes aérobies prélevés devant le delta du rhône. IV. Besoins en vitamines et liberation de ces substances

✍ Scribed by B. R. Berland; D. J. Bonin; J. P. Durbec; S. Y. Maestrini

• Publisher: Springer
• Year: 1976
• Tongue: English
• Weight: 472 KB
• Volume: 50
• Category: Article
• ISSN: 1573-5141
• DOI: 10.1007/bf00019820

✦ Synopsis

Aerobic heterotrophic bacteria isolated in front of the Rhbne outlet. IV. Requirements and production of vitamins. The authors have isolated 232 bacteria, belonging to the usual genera found in sea water, from eutrophic surface sea water and studied their vitamin requirements with special attention to vitamin B 12 , biotin and thiamin: 26% of the strains require at least one of the i growth substances used; 3.5% need vit. B 12 , o% biotin and I4% thiamin.

With the same bacteria, the authors have screened the vitamin producing strains; results show that 18% of the strains produce thiamin, 26% vit. B and 45% biotin.

As far as the three main substances are concerned, data support the idea that vitamin producing germs are more numerous than those which require vitamin.

In authors' opinion the bacteria play an important role, together with other producers such as algae, in maintaining the growth factors above the limiting concentration required by a normal level of primary production, despite the fact that the non marine sources of vitamins cannot be neglected in the studied area.