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21. Induced autotrophism in yeast.

22. The Effect of pH on the availability of p-aminobenzoic acid to Neurospora crassa.

23. Nitrogen metabolism in Saccharomyces cerevisiae.

24. The Anti-biotin effect of desthiobiotin.

25. A Quantitative comparison of biotin and desthiobiotin for the growth of certain microorganisms.

26. Conversion of desthiobiotin into biotin or biotinlike substances by some microorganisms.

27. The Interrelationship of iron and certain accessory factors in the growth of Rhizobium trifolii, strain 205.

28. The Effect of nutrition on the sporulation of Melanconium fuligineum in culture.

29. The Utilization of oligosaccharides by some species of ceratocystis.

30. Partial vitamin deficiencies in four strains of Colletotrichum lindemuthianum.