Twenty alkalophilic actinomycetes with optimum growth pH of 9·0 to 9·5 were isolated. Although these new isolates morphologically closely resembled conventional streptomycetes containing ll-diaminopimelic acid, nine out of 20 isolates contained meso-diaminopimelic acid.
Among 420 International Streptomyces Project (ISP) Streptomyces strains tested for their maximum growth pH, only 6 strains grew at pH 11·5. Of these six strains, three strains, S. caeruleus ISP 5103, A. alborubidus ISP 5465 and S. autotrophicus ISP 5011 contained meso-diaminopimelic acid.
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