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Abstract: Fungi in the natural state usually live in a dilute solution of various carbon sources. whereas m the laboratory pure culture normally one single carbon source is available, In nature carbon sources, such as cellulose and hgnin, become far more rapidly utihzable under the influence of 'induced enzymes'. The ability of fungi to synthesize 'new' enzymes deserves attention both in nature and in practice. In case of inoculation with mycelium of 'dormant' cells, the colony starts growing later. The reason is, that a sufficient quantity of l-sorbose is reached only after a longer period. The presence of a small quantity of d-glucose induces immediate growth, and at the moment this stock is exhausted, the enzyme activity has reached a sufficient level for the process to continue. When a growing mycelium colony is inoculated, sorbose decomposition begins fairly soon and its rate seems to be correlated with the activity level of the other enzyme-forming mechanisms. Above a certain concentration, a more or less prolonged delay in sorbose utilization may be observed, even in a growing mycelium colony. From this it may be concluded that m the cell, in the case of the actual enzymatic adaption, the relative concentration of the induced enzyme is more or less in balance with that of the specific substrate.
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