Growth of Erysiphe Germ Tubes in Deuterium Oxide After Exposure to Water

Growth of Roots in Deuterium Oxide

“…The irreversibility increased with increasing length of exposure to D"O. A similar phenomenon has been observed in the fungus that causes the powdery mildew disease of wheat (Pratt, 1936(Pratt, , 1937.…”

“…The helpful suggestions of Prof. Sam F. Trelease are gratefully acknowledged. -The D 2 0 was prepared in the Department of Chemistry by the method described by Brown and Daggett (1935) and was purified in our laboratory as in previous experiments (Pratt, 1936;· Craig and Trelease, 1937). The ordinary control water (H 20 containing 0.02 per cent D 2 0 ) was distilled through a quartz condenser and was then purified in the same manner as the D.,O.…”