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.
Gastric juices and pepsin are part of the cleavage process. Pepsin also cleaves nonheme iron -- which is found in plant foods such as cereals, fruits and vegetables -- from a protein to facilitate absorption.epsinogen reacts with stomach acid, or hydrochloric acid, and becomes the active enzyme -- pepsin. Pepsin partially digests proteins into smaller units called peptides. It works best at a highly acidic pH between 1.5 and 2.5.