Herbert J.A. Dartnall Photochemistry of Vision 9783642650680

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Автор: Herbert J.A. Dartnall
Название: Photochemistry of Vision
ISBN: 9783642650680
Издательство: Springer
Классификация:

Медицина: общие вопросы

Зоология и науки о животных

ISBN-10: 3642650686
Обложка/Формат: Soft cover
Страницы: 848
Вес: 1.45 кг.
Дата издания: 15.11.2011
Серия: Autrum,H.(Eds):Hdbk Sens.Physiology Vol 7
Язык: English
Издание: Softcover reprint of
Иллюстрации: Black & white illustrations, bibliography
Размер: 244 x 170 x 43
Читательская аудитория: Professional & vocational
Основная тема: Zoology
Ссылка на Издательство: Link
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Поставляется из: Германии
Описание: Radiation can only affect matter if absorbed by it. Within the broad range of 300-1000 nm, which we call the visible, light quanta are energetic enough to produce excited electronic states in the atoms and molecules that absorb them. In these states the molecules may have quite different properties from those in their dormant condition, and reactions that would not otherwise occur become possible. About 80 % of the radiant energy emitted by our sun lies in this fertile band, and so long as the suns surface temperature is maintained at about 6000 C this state of affairs will continue. This and the transparency of our atmosphere and waters have allowed the generation and evolution of life. Before life began the atmosphere probably also transmitted much of the solar short-wave radiation, but with the rise of vegetation a new product - oxygen - appeared and this, by a photochemical reaction in the upper atmosphere, led to the ozone layer that now protects us from the energetic short-wave quanta that once, perhaps, took part in the generation of life-molecules. Light is an ideal sensory stimulus. It travels in straight lines at great speed and, consequently, can be made to form an image from which an animal can make true, continuous and immediate assessments of present and impending events.

Photochemistry of Vision, Herbert J.A. Dartnall