الفهرس 
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Abstract
1.1. Proteolytic enzymes and their importance.
Proteases of commercial importance are produced from microbial, animal and plant sources. The proteases constitute a very large and complex group of enzymes which differ in properties such as substrate specificity, active site and catalytic mechanism, pH and temperature activity and stability profile. Commercial proteases have application in a range of processes which take advantage of the unique physical and catalytic properties of individual proteolytic enzyme types (Aunstrup, 1979, 1980; Fogarty & Kelly, 1979; Rutt Loff, 1981; Godfrey & Reichelt, 1983 and Banerjee and Bhattacharyya, 1992).
Milk clotting enzymes have been used to transform milk into products such as cheese (Subramanian et al, 1979; Schindler et al, 1983 and Banerjee & Bhattacharyya 1992).Pancreatic proteases were used for dehairing and bating of hides.
Recently, Malathi and Chakraborty (1991) investigated the production of alkaline protease by Aspergillus flavus in solid substrate fermentation for use as depilation agent of hides and skins.
Around 1961 it was discovered that alkaline protease from Bacillus licheniformis (Subtilisin Carlsberg.