1968
DOI: 10.1128/am.16.12.1831-1840.1968
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Variations in the Growth Response of Four Different Vitamin B 12 Assay Microorganisms to the Same Tissue and Standard Preparations

Abstract: Four microbiological assay procedures ( Escherichia coli, Lactobacillus leichmanni, Euglena gracilis , and Ochromonas malhamensis ) for the vitamin B 12 content of rat liver and kidney tissue were compared. Significant differences in the growth response for portions of the same sample based on the same standard preparations were noted. The liver values with E. coli were strikingly higher than those obtained with the… Show more

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