This book illustrates the development of Brownian ratchets, from their foundations to their role in molecular-scale life and in artificial nano-machinery.This book illustrates the development of Brownian ratchets, from their foundations, to their role in the description of life at the molecular scale and in the design of artificial nano-machinery. For advanced graduates and researchers entering the field, this book provides a pedagogical overview and includes coverage of current experimental developments.This book illustrates the development of Brownian ratchets, from their foundations, to their role in the description of life at the molecular scale and in the design of artificial nano-machinery. For advanced graduates and researchers entering the field, this book provides a pedagogical overview and includes coverage of current experimental developments.Illustrating the development of Brownian ratchets, from their foundations, to their role in the description of life at the molecular scale and in the design of artificial nano-machinery, this text will appeal to both advanced graduates and researchers entering the field. Providing a self-contained introduction to Brownian ratchets, devices which rectify microscopic fluctuations, Part I avoids technicalities and sets out the broad range of physical systems where the concept of ratchets is relevant. Part II supplies a single source for a complete and modern theoretical analysis of ratchets in regimes such as classical vs quantum and stochastic vs deterministic, and in Part III readers are guided through experimental developments in different physical systems, each highlighting a specific unique feature of ratchets. The thorough and systematic approach to the topic ensures that this book provides a complete guide to Brownian ratchets for newcomers and established researchers in physics, biology and biochemistry.Part I. Historical Overview and Early Developments: 1. Limitations imposed by the second law of thermodynamicslóÝ