EFFECTS OF CERTAIN LIMITING CONDITIONS ON THE SYNTHESIS OF B VITAMINS BY XXXX .

@entity1501 @entity2245 @entity8580 @entity1885 @entity37350 @entity2764 @entity1670 @entity9138 @entity11057 @entity11894 @entity2221 @entity375
In @entity375 crops which were grown in the presence of various inhibitors, there was considerable variation in content of the various B vitamins. A higher degree of parallelism in variation in content was found to exist between @entity9138 and @entity1670 than between any other pair of vitamins; this has been interpreted as indicating that the predominant functions of these two vitamins are their established r  les in fermentation. Values for @entity8580 indicate that it may be involved in fermentation processes, but this is not the case for other members of the B complex. @entity1885 appears to be unique since in no case did the @entity1885 content of @entity375 grown in the presence of an inhibitor fall below that of the control @entity375 . There was some evidence of synthesis of @entity1885 , or a material with @entity1885 activity, in the presence of certain inhibitors, the most striking instance being with @entity37350 . An exogenous supply of @entity1885 was essential for extensive proliferation of F. @entity375 , and @entity375 grown in a medium to which @entity1885 was the only added vitamin contained the B vitamins in amounts very similar to those found in the control @entity375 , the most marked differences being in increased @entity2245 and @entity11894 contents. In the absence of @entity1885 , significant amounts of all of the B vitamins except @entity1885 were synthesized, both in the presence and absence of certain other members of the B complex. The addition of @entity9138 , @entity2764 , @entity8580 , and @entity11057 to the culture medium caused a reduction in the amounts of @entity2245 and @entity11894 synthesized. F. @entity375 was able to grow in a xylose medium only when certain of the B vitamins were present, and even then growth was limited. Evidence was obtained for some synthesis of all of the vitamins investigated except @entity1885 and @entity2245 . The most significant differences in @entity2221 content between galac @entity375 and the parent F. B. strain were in @entity1501 and @entity2245 , the former being considerably reduced in amount, the latter being increased.
