Microbial bioactive compounds have received growing attention for their implications in human health. This book covers all aspects of bioactive products from microbes, including antibiotic compounds, polysaccharides, inhibitors, enzymes, peptides, and pigments. These are used in various fields of biology that range from nutraceuticals to cosmeceuticals. Marine bacteria and fungi are of considerable importance as new promising sources of a huge number of biologically active products. This book will be of great interest to students and researchers working in the very active and competitive fields of antibiotic and agrochemical discovery.