Microbiological determination of vitamins and amino acids produced by microorganisms, using the dialysis cell.

Investigations on the associative interrelationships between microorganisms have engaged increasing attention in recent years. As is well known, these relationships play an important role in nature and also in many branches of industrial.microbiology. In view of the great significance of these associative phenomena in biology, and especially in microbiological ecology, this is undoubtedly a field in which great and important