There is a great practical interest in thermophilic fungi because of the prospects of finding enzyme variants with high temperature optima and long "shelf life," desirable properties for enzymes used in various industries. Chiefly, the extracellular (secreted) enzymes have been studied as the mycelium is easily removed by the filtration method and large amounts of culture filtrates obtained as starting material for enzyme purification. The extracellular enzymes of thermophilic fungi have molecular masses ranging from 20 to 60 kDa and are thermostable (Maheshwari et al., 2000). Examples of a few extracellular enzymes purified from cultures of thermophilic fungi are given below.
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