In the following experiments, cytochrome c was modified by splitting off a great part of the protein portion of the molecule with pepsin. The resulting substance was then isolated and studied.

The new Pepsin Digestibility Rotator from Glas-Col offers variable speed with end-over-end mixing action for a gentle slosh to rapid agitation. Driven by a continuous-duty motor, it can stand up ...

THE nature of the enzymes was a matter for con siderable spectlation so recently as twenty years ago, and the isolation of the gastric proteolytic enzyme pepsin by Dr. John H. Northrop in 1930 as ...

This depends on the type of enzyme. The enzyme pepsin breaks down proteins in the acidic conditions of the stomach. Pepsin has an optimum of pH 2.5 and a working range of between pH 1-4.