Table 10 shows that during the stationary phase, the average amount o f total
intracellular lipids was low (73 mg) and about 1/3 o f that extracted from fungal mycelia
during exponential growth. The largest pool was free fatty acids, which represented about
67% of total intracellular lipids. The fatty acid content was highest when UDA (120.7
mg) was used as the sole source of carbon and energy. When UDA+PDB is the substrate,
the fatty acid content is reduced to 52% of all lipids during the stationary phase. When
PDB was used as the carbon substrate, slight decreases in the content o f fatty acids (1.1
mg) were observed (Table 10). During the stationary phase, the amount o f hydrocarbons
was (3.3 mg) nearly 7% of the total amount o f lipid classes, but less than the amount of
(6.6 mg) measured in the exponential phase, when UDA+PDB and UDA are carbon
substrates (Figure 9).