Biophysics by Prof. Dr. Roland Glaser (auth.) PDF

By Prof. Dr. Roland Glaser (auth.)

ISBN-10: 364208639X

ISBN-13: 9783642086397

ISBN-10: 3662044943

ISBN-13: 9783662044940

The message of this publication is that biophysics is the technological know-how of actual ideas underlying the "phenomenon lifestyles" on all degrees of association. instead of instructing "physics for biologists" or "physical tools utilized to biology", it regards its topic as an outlined self-discipline with its personal community of rules and ways. The publication starts off through explaining molecular constructions of organic platforms, different types of atomic, molecular and ionic interactions, events, strength move, self association of supramolecular buildings and dynamic houses of organic membranes. It then is going directly to introduce the organic organism as a non-equilibrium method, prior to treating thermodynamic recommendations of osmotic and electrolyte equilibria in addition to currents and strength profiles. It keeps with themes of environmental biophysics and such scientific features because the impression of electromagnetic fields or radiation on dwelling structures and the biophysics of listening to and noice safety. The e-book concludes with a dialogue of method analyses, together with types of neural procedures in addition to of ecological interactions, development, differentiation and evolution.

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3) J. 7) 1= KlnP. This is the Shannon equation of information theory. The unit of I is determined by the unit of the factor K. The bit ("binary digit") is most commonly used. It expresses the number of binary yes-no decisions which are needed to determine a given message. For example, the one side of the coin can be guessed by one single decision, its information value, consequently, is 1 bit. Five binary decisions will be sufficient to guess a card from a deck. Hence, the information value of one card is 5 bits.

E. Schrodinger (1944) called the biological structure an aperiodic crystal. This means a highly organized structure, the elements of which are not simply repeated periodically. Sometimes one tries to evaluate this structural organization as structural information. As we pointed out in the previous section, however, it is hard to quantify this parameter. Probably, the structural information should be measured as the effort which is necessary to describe such a structure perfectly. 3 Thermal Molecular Movement, Order and Probability 35 Consequently, the processes of structure formation of biological systems, be it the development of life, its reproduction, or simply the biosynthesis of a macromolecule, are all accompanied by reduction of entropy.

3) InA +-lnB = In(A . B). Hence entropy is proportional to logarithm of W: S--klnW. 4) This is the Boltzmann equation of entropy. Boltzmann's constant k was defined as a universal constant later by Max Planck. 10 5 eVK 1. This explanation has been based on the simplest experiment where four spheres are distributed randomly over two compartments. One step towards serious thermodynamics can be taken if, for example, the compartments of this box are thought of as molecules of a system, and the spheres as quanta of energy, distributed among them.

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Biophysics by Prof. Dr. Roland Glaser (auth.)

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