by Asymmetric Synthesis 35 2. The Transmission of Asymmetry, from the Thermodynamic and Kinetic Point of View 37 6 3. Maintenance of Optical Purity by the So-Called ''Stereo-autonomic Substances" 4.
Spontaneous variants of the beromycin-producing strain Streptomyces glomeratus 3980 were divided into five groups (A-E) according to increasing antibiotic activity. The most active variants (group E) differed from the other types and the wild strain by a suppressed ability to produce aerial mycelium and melanoid piogment and by an increased production of propionic acid. Strains with a 12-fold higher antibiotic production capacity (with respect to strain 3980) were obtained by selection of superior segregants from submerged cultures of the E type.
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