This reference covers information currently available on the specific properties of metallic nanoparticles and compares their properties with those related to nano-objects formed by biological molecules. Containing more DNA physics and molecular biology than other published books, it also presents the details of formation and physicochemical peculiarities of DNA nanostructures and DNA-based nanoconstructions. The authors discuss how nucleic acid molecules and their complexes with chemical and biologically active compounds are of great interest in the development of various nanoscale systems and devices of practical importance.