Nanoscience is a multidisciplinary area of science which enables researchers to create tools that help in understanding the mechanisms related to the interactions between nanomaterials and biomolecules (nanotechnology). Nanomaterials represent nanotechnology products. These products have an enormous impact on technical industries and the quality of human life. Nanomaterials directly or indirectly have to interact with biosystems. It is, therefore, essential to understand the beneficial and harmful interactions of nanomaterials with and within a biosystem, especially with reference to humans. This book provides primary and advanced information concerning the interactions between nanomaterials and the components of a typical biosystem to readers. Chapters in the book cover, in a topic-based approach, the many facets of nanomolecular interactions with biological molecules and systems that influence their behavior, bioavailability and biocompatibility (including nucleic acids, cell membranes, tissues, enzymes and antibodies). A note on the applications of nanomaterials is also presented in the conclusion of the book to illustrate the usefulness of this class of materials. The contents of the book will benefit students, researchers, and technicians involved in the fields of biological sciences, such as cell biology, medicine, molecular biology, food technology, cosmetology, pharmacology, biotechnology, and environmental sciences. The book also provides information for the material science personnel, enabling them to understand the basics of target-oriented nanomaterials design for specific objectives.