الفهرس 
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Abstract
Archaea represent an exciting group of extremophiles, their adaptations towards high salt, high pH draw attention for studying these organisms as a source of industrially valuable enzymes under extreme environmental parameters. Studies on the enzymes adapted to extreme conditions may provide indispensable tool in designing the strategies for their rational improvements. Enzymes are so fine-tuned with nature that they often do not coincide with the desired properties and activities useful for biotechnological applications. Therefore, it was of significant interest to focus on protease production from a rarely explored group of bacteria (Archaea).