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Download Biology Now: Core Edition by Anne Houtman PDF

By Anne Houtman

Written by way of a technological know-how journalist and lecturers with over thirty years event within the lecture room, Biology Now skillfully blends center biology techniques with well known technological know-how tales of actual humans doing technology this present day. those tales seize the human face of biology, highlighting the paintings of researchers and doctors who're making new discoveries on a daily basis. The textual content is observed via a wealth of conscientiously crafted pedagogy that teaches scholars tips to research technological know-how within the information, interpret facts, ask questions, and distinguish among technology and pseudoscience.

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Extra resources for Biology Now: Core Edition

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Such new light–matter interactions are, for example, reflection and diffraction of light. , united cell structures or tissues. For these phenomena the aforementioned molecular polarization is of particular importance. , as an averaged value. 5). Because of the refractive index of glass, light no longer travels at almost 300 000 km s−1 but only with a reduced speed of 198 000 km s−1 . Since the frequency of the light wave remains constant while travelling through matter the wavelength is reduced from 500 nm to about 330 nm.

The light penetrating into the tissue is absorbed more or less depending on the wavelength. Besides absorption, the straight- forward propagation of light is hindered within biological tissue by Rayleigh and Mie scattering. Depending on the biological tissue, only a minimal intensity of the originally applied electromagnetic radiation reaches through the tissue. such as blood, melanosome and epidermis. Owing to the high absorption of biological tissue over a relatively broad spectral range, the penetration depth of light strongly depends on the light wavelength used.

We can, indeed we must, learn from nature. Nature demonstrates how valuable and fruitful the interaction between light and biological systems, and thus Biophotonics as defined above, can be for life. Consider the “harnessing” of photons. Plants utilize light via photosynthesis as an energy source. In the process of vision light generates pictures of our environment in our brains by a quite complicated 1 Introduction: Biophotonics – Visions for Better Health Care but very efficient pathway. The scientist dealing with Biophotonics attempts to understand nature by mimicking the basic principles and taking advantage of the same tools.

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