Mixed Monolayers of Phospholipids and Fusogenic Lipids

after 24h no further increases were noted. Table 1 summarizes the general distribution pattern, and the extent of incorporation of 99Mo into protein in male mice after 2 days of oral administration. In a preliminary survey no sexual dimorphism was found. The duodenum had the highest degree of 99Mo incorporation and enzyme activity. Table 1 also shows the corresponding pattern for Drosophila larvae cultured on agar plates overlaid with Brewer’s Yeast containing traces of the radioactive isotope. It can be seen that in both systems the excretory organ exhibits a high degree of uptake and incorporation, but a relatively low enzyme activity. Some preliminary work on hens (Anke et al., 1971) also indicates that this may be a general feature in animal systems.