All rights reserved. Terms of use. Â¨ 37 11 Thermodynamics andThermochemistry Thermodynamics is the study of heat, and how heat can be interconverted into other energyforms. In thermodynamics the system is a specific part of the universe that is being studied,often the system is a chemical reaction. The surroundings are all parts of the universe that arenot the system, typically everything outside the test tube.Â¥ An open system can exchange both energy and matter with its surroundings.
Pepsin has been used as a substitute for rennin in the production of certain cheeses. Treatment of hides. Pepsin is used by the leather industry to remove undesirable traces of remaining tissue, such as hair and fat, from partially processed hides. This enzymatic treatment is called âbatingâ the hides.
Pepsin, the powerful enzyme in gastric juice that digests proteins such as those in meat, eggs, seeds, or dairy products. 1  Pepsin was first recognized in 1836 by the German physiologist Theodor Schwann. 2  Glands in the mucous-membrane lining of the stomach make and store an inactive protein called pepsinogen.