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In a preliminary note (l), the present authors reported that Lactobacillus Eeichmannii 313 is capable of using six alternative factors for growth in vitamin Bn-deficient media. Two of these were found in vitamin Blz concentrates and presumably represent two forms of the vitamin. Hoffmann et al. (2) previously noted that crystalline antipernicious anemia(More)
The combustion method has been modified to increase the recovery of tritiated water after combustion of a tritium-labeled tissue sample. This was accomplished by cooling the bottom of the combustion flask in a dry ice-acetone bath while irradiating the top with an infrared lamp. The procedure resulted in at least 92% to 102% recovery of the tritiated water.(More)