Bøger af Sonke Johnsen

A sea-going scientist explores how ocean life thrives in one of the most mysterious environments on Earth The open ocean, far from the shore and miles above the sea floor, is a vast and formidable habitat that is home to the most abundant life on our planet, from giant squid and jellyfish to angler fish with bioluminescent lures to draw prey into their toothy mouths. Into the Great Wide Ocean takes readers inside the peculiar world of the sea-going scientists who are providing tantalizing new insights into how the animals of the open ocean solve the problems of their existence. Sönke Johnsen vividly describes how life in the water column of the open sea contend with a host of environmental challenges, such as gravity, movement, the absence of light, pressure that could crush a truck, catching food while not becoming food, finding a mate, raising young, and forming communities. He interweaves stories about the joys and hardships of the scientists who explore this beautiful and mysterious realm, which is under threat from human activity and rapidly changing before our eyes. Into the Great Wide Ocean presents the sea and its inhabitants as you have never seen them before and reminds us that the rules of survival in the open ocean, though they may seem strange to us, are the primary rules of life on Earth.

Optics--a field of physics focusing on the study of light--is also central to many areas of biology, including vision, ecology, botany, animal behavior, neurobiology, and molecular biology. The Optics of Life introduces the fundamentals of optics to biologists and nonphysicists, giving them the tools they need to successfully incorporate optical measurements and principles into their research. Sonke Johnsen starts with the basics, describing the properties of light and the units and geometry of measurement. He then explores how light is created and propagates and how it interacts with matter, covering topics such as absorption, scattering, fluorescence, and polarization. Johnsen also provides a tutorial on how to measure light as well as an informative discussion of quantum mechanics. The Optics of Life features a host of examples drawn from nature and everyday life, and several appendixes that offer further practical guidance for researchers. This concise book uses a minimum of equations and jargon, explaining the basic physics of light in a succinct and lively manner. It is the essential primer for working biologists and for anyone seeking an accessible introduction to optics.Some images inside the book are unavailable due to digital copyright restrictions.