This book will cover most of the up-to-date recognition receptors technologies used in biosensors. Since this book is written by the world's most renowned and learned scientists in their own area of expertise, we believe that the calibre of the finished product will be as renowned as their reputation. To the best of the editor and authors knowledge this book is a first in this field. We will aim to cover this increasingly hot area of research especially in relation to the new biosensing techniques. Most of the universities are teaching the recognition receptors topics in the Biosensors, separation and Microsystems courses. However, there is no single reference book that covers this interesting area. So the aim of this book is to be a textbook for the undergraduate and graduate student upwards, and an important reference for the professionals working in different fields including biomedical, natural sciences, physical sciences, and nanotechnology, m-TAS, veterinary, food QA, bioterrorism and security as well as health surveillance. The book will cover the different recognition receptors used up-to-date in the different sensing transducer and microarrays platforms. It will cover the background, theory behind each technology, state-of-the-art review for all the new technologies used in biosensing in detail. Strategies and future prospectus are suggested at the end of each chapter for developing future technologies to achieving a better sensitivity, stability and swifter biosensing detection.