Biophysics: An Introduction by Roland Glaser (auth.)

By Roland Glaser (auth.)

Biophysics is the technology of actual rules underlying all methods of existence, together with the dynamics and kinetics of organic systems.

This totally revised 2nd English variation is an introductory textual content that spans all steps of organic association, from the molecular, to the organism point, in addition to impacts of environmental elements. in keeping with the big growth lately made, particularly in theoretical and molecular biophysics, the writer has up-to-date the textual content, integrating new effects and advancements bearing on protein folding and dynamics, molecular features of membrane meeting and shipping, noise-enhanced approaches, and photo-biophysics. The advances made in theoretical biology within the final decade demand an absolutely new belief of the corresponding sections. therefore, the publication offers the historical past wanted for primary education in biophysics and, moreover, bargains loads of complex biophysical knowledge.

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Sample text

This appeared to be contrary to the second law of thermodynamics and has given rise to heated philosophical discussions in the past. The second law of thermodynamics actually postulates that in spontaneous processes occurring in isolated systems, the entropy strives towards a maximum. , the earth as a whole can be considered as an isolated system. The earth is constantly absorbing energy from the sun and is emitting this energy again. That continuous flow of energy maintains a permanent nonequilibrium state which manifests itself not only in a direct way in photosynthesis with subsequent metabolism of heterotrophic organisms, but also in the environment of life, for example, in flowing water, in alternation of light and darkness, and in changes in temperature, humidity, etc.

In this context, P ¼ 0 means an impossibility, while P ¼ 1 expresses absolute certainty. The logical conclusions which led to the derivation of the Boltzmann equation (cf. Sect. 1) are the same as those on which the Shannon relation is based. Information (I) is a function of mathematical probability (P): I ¼ f ðPÞ The condition for the function f again, is satisfied by the logarithmic function, since here too, the multiplication rule for the calculation of probabilities must be valid (cf. Eq. 3).

20) Real biological processes usually consist of a large number of single reactions, each with different activation energies. Hence, a temperature dependence must be expected which is much more complicated than that expressed by the Arrhenius equation (Eq. 17). Surprisingly, however, even in these cases functions will still be obtained which can be described by straight lines in the Arrhenius plot. This is caused by the fact that in complicated processes the rate of the overall process is determined by a simple rate-limiting reaction.

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