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Voltage-gated ion channels are transmembrane proteins in which at least one gate is controlled by the transmembrane potential. They are frequently very selectively permeable to sodium (Nav channels), potassium (Kv channels) or calcium (Cav channels) ions. Depending on the channels, opening of the activation gate is triggered by membrane depolarization (Kv, Nav and Cav channels) or hyperpolarization (HCN channels for instance). In addition, in many voltage-gated channels, a so-called inactivation gate is also present. Compared to the activation gate, the latter is oppositely coupled to the potential: In Kv, Nav and Cav channels, upon membrane depolarization, the inactivation gate closes where...
The diverse applications in this volume range from the study of allosteric regulation of ion channel activity using a classic mutagenesis approach, to the study of channel subunit stoichiometry using a novel biophysical approach based on fluorescence resonance energy transfer. Highlights include methods for heterologous expression of ion channels in cells, for determining channel structure-function, and for studying channel regulation.
Explores the limits of human survival and the physiological adaptations that enable us to exist under extreme conditions. The author reviews limits to human life underwater, at high altitudes, at high speeds, at micro levels, and at freezing and hot temperatures.
This open access volume compiles student reports from the 2022 Simula Summer School in Computational Physiology. The reports provide an overview of some tools available to model physiology in excitable tissues across scales and scientific questions. In 2022, Simula held the eighth annual Summer School in Computational Physiology in collaboration with the University of Oslo (UiO) and the University of California, San Diego (UCSD). Each year, the course focuses on modeling excitable tissues, with a special interest in cardiac physiology and neuroscience. Group research projects conducted by graduate students from around the world result in reports addressing problems of physiological importance. Reports may not necessarily represent new scientific results; rather, they can reproduce or supplement earlier studies. Reports from seven of the summer projects are included as separate chapters. The topics represented include multiscale mechanics, electrophysiology, pharmacology, and machine learning.
A microhistory in the vein of Salt and Cod exploring the biological, evolutionary, and cultural history of one of the world's most fascinating fibers. Most people don't give a second thought to the stuff on their head, but in Hair, Kurt Stenn — one of the world's foremost hair follicle experts — takes readers on a global journey through history, from fur merchant associations and sheep farms to medical clinics and patient support groups, to show the remarkable impact hair has had on human life. From a completely bald beauty queen with alopecia to the famed hair-hang circus act, Stenn weaves the history of hair through a variety of captivating examples, with sources varying from renaissan...