Biocatalysis are used as natural catalysts, like protein enzymes, to perform chemical transformations on organic compounds. Both enzymes that have been more or less isolated and enzymes still residing inside living cells are employed for this task. Since biocatalysis deals with enzymes and microorganisms, it is historically classified separately from "homogeneous catalysis" and "heterogeneous catalysis". However, biocatalysis is simply a heterogeneous catalysis.
Related Journals of Biocatalysis