Lipid Formation in Cryptococcus terricolus. I. Nitrogen Nutrition and Lipid Formation.

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Abstract
The yeast C. terricolus was found to contain up to 70% lipids on a dry weight basis. The lipid production was found to be independent of the quantities of N supplied. Even with 40 g (NH4)2SO4/liter of solution, corresponding to a C/N ratio of 1.9, the cells contained 55% of lipids. Lipid production was also independent of the nature of the N source. The protein content amounted to 10-18%. Lipid production was closely connected with growth. In the logarithmic phase of growth, the production of lipids was at its maximum. Lipid respiration started when the carbohydrate of the medium had been consumed. This was indicated by the low R.Q. values found for starving yeast cells. The addition of glucose to starving cells caused a sudden increase in the R.Q. value. The inverse relationship between lipids and proteins, usual in "fat" yeasts, does not occur in this organism. The protein content remains almost constant during growth, while the lipid content increases up to 65-70%.

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