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For the general public, magnetism often seems more the province of new age quacks, movie mad scientists, and grade-school teachers than an area of actual, ongoing scientific inquiry. But as Ronald T. Merrill reveals in Our Magnetic Earth, geomagnetism really is an enduring, vibrant area of science, one that offers answers to some of the biggest questions about our planet’s past—and maybe even its future. In a clear and careful fashion, he lays out the physics of geomagnetism and magnetic fields, then goes on to explain how Earth’s magnetic field provides crucial evidence for our understanding of continental drift and plate tectonics; how and why animals, ranging from bacteria to mammals, sense and use the magnetic field; how changes in climate over eons can be studied through variations in the magnetic field in rocks; and much more. Throughout, Merrill peppers his scientific account with bizarre anecdotes and fascinating details, from levitating pizzas to Moon missions to blackmailing KGB agents—a reminder that real science can at times be stranger, and more amusing, than fiction. A winning primer for anyone who has ever struggled with a compass or admired a ragged V of migrating geese, Our Magnetic Earth demonstrates that education and entertainment need not be polar opposites.
Sphingolipids are fundamental to the structures of cell membranes, lipoproteins, and the stratum cornea of the skin. Many complex sphingolipids, as well as simpler sphingoid bases and derivatives, are highly bioactive as extra- and intracellular regulators of growth, differentiation, migration, survival, senescence, and numerous cellular responses to stress. This book reviews exciting new developments in sphingolipid biology/sphingolipidology that challenge our understanding of how multicellular organisms grow, develop, function, age, and die.
Designed for quick reference in the clinical environment, Merrill's Pocket Guide to Radiography is a pocket-sized companion to Merrill's Atlas of Radiographic Positioning and Procedures, 12th Edition. This handy resource summarizes essential information for 170 of the most frequently requested projections you'll encounter. Authors Eugene Frank, Barbara Smith, and Bruce Long concisely present just the information you'll need for quick reference -- keep it with you and keep Merrill's close at hand! Diagnostic-quality radiographs demonstrate desired imaging results. Key positioning information is formatted for quick and easy access. Each procedure is presented in a two-color, two-page spread with bulleted, step-by-step procedures and accompanying images on the top page; and a chart with spaces to fill in the specific techniques used for a particular projection on the bottom page. Section dividers with tabs offer quick access to each section. Computed radiography information allows you to make the subtle adjustments necessary to obtain optimal results with CR. Exposure technique chart for every projection helps reduce the number of repeat radiographs and improves overall image quality. Abbreviations and external landmark charts on the inside covers provide quick access to frequently needed information. kVp values are included for each projection. Compensating filter information included for those projections where filters are used. New exposure index column for use with digital imaging systems Specific collimation settings for all projections done using DR Systems
An invaluable road map for the epic poem of our time
This field guide sets a new standard for insect identification, making it an indispensable resource to naturalists, educators, gardeners, and others. Engaging and accessible, Pacific Northwest Insects features detailed species accounts, each with a vivid photograph of a living adult, along with information for distinguishing similar species, allowing the reader to identify more than 3,000 species found from southern British Columbia to northern California and as far east as Montana. The book features most of the commonly encountered insects, spiders, scorpions, millipedes, centipedes, and kin in the Pacific Northwest, as well as representatives of an amazing variety of unusual and interesting insects living in the area. After more than a decade of research, reviewing hundreds of thousands of museum specimens and scouring the technical entomological literature, Merrill Peterson has brought together for the first time in a single volume a wealth of information on the region's insect life. Detailed identifying information on over 3,000 species Complete description of 1,200 species Organized by insect group for easy identification Up-to-date taxonomy 1,725 color photos, 50 line drawings, and 2 maps