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Over the last several years, the use of nuclear§hyperpolarization techniques in nuclear magnetic§resonance (NMR) spectroscopy and magnetic resonance§imaging (MRI) has increased exponentially. Since the§signal sensitivity can be enhanced by orders of§magnitude compared to that in the normal conditions,§nuclear hyperpolarization, when applied to NMR/MRI§studies of chemical/biological interest, could enable§us to observe what we have so far not been able to,§and thereby bring us into a new realm of science.§This book focuses one of several ways to attain§nuclear hyperpolarization, namely, dynamic nuclear§polarization (DNP) using electron spins in the§photo-excited triplet state, addressing its basic§principles, discussing the elementary processes of§spin-polarization transportation behind the buildup§behavior, and presenting practical experimental tips.§Thus, this book should be especially useful to§graduate students in physics and chemistry studying§nuclear hyperpolarization, and anyone who may be§considering utilizing nuclear hyperpolarization for§NMR/MRI in chemical, biological, and medical §sciences.