Abstract
EARLIER studies in this laboratory1 have indicated the presence in soil of bacteria dependent upon growth-factors provided by soil extract but not by yeast extract nor by combinations of amino-acids and vitamins (not including B12). More recently it was shown2,3 that for many of the indigenous soil bacteria dependent upon essential growth-factors supplied by soil extract, the nutrilite effect of the latter could be replaced by vitamin B12. Other micro-organisms, however, remained dependent upon unidentified growth-promoting substances in soil.
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References
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LOCHHEAD, A., BURTON, M. & THEXTON, R. A Bacterial Growth-Factor Synthesized by a Soil Bacterium. Nature 170, 282 (1952). https://doi.org/10.1038/170282a0
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DOI: https://doi.org/10.1038/170282a0
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