Thermal Biophysics of Membranes - download pdf or read online

By Thomas Heimburg

ISBN-10: 3527404716

ISBN-13: 9783527404711

An outline of contemporary experimental and theoretical advancements within the box of the physics of membranes, together with new insights from the previous decade.The writer makes use of classical thermal physics and actual chemistry to provide an explanation for our present realizing of the membrane. He appears to be like at area and 'raft' formation, and discusses it within the context of thermal fluctuations that categorical themselves in warmth means and elastic constants. additional subject matters are lipid-protein interactions, protein binding, and the influence of sterols and anesthetics. Many probably unrelated homes of membranes are proven to be in detail intertwined, prime for example to a coupling among membrane nation, area formation and vesicular form. This additionally applies to non-equilibrium phenomena just like the propagation of density pulses in the course of nerve activity.Also incorporated is a dialogue of the applying of machine simulations on membranes.For either scholars and researchers of biophysics, biochemistry, actual chemistry, and gentle topic physics.

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If one is undecided which of the two free energies to use for calculations related to a given experiment, one has to look at what kind of experiment one intends to perform. , room temperature) and at constant pressure (usually at atmospheric pressure). Under these circumstances, the Gibbs free energy is the function that determines the thermal equilibrium. The enthalpy H plays a similar role for the Gibbs free energy, as the internal energy E does for the Helmholtz free energy. The Helmholtz free energy is a useful quantity for experiments performed under conditions of constant temperature and volume, for example in a closed container.

18) T,p,n j ,... 7). The number of particles of a given species (or state) also changes in lipid melting (Chapter 7) and in protein unfolding. Under conditions of constant pressure and constant temperature the chemical potential is identical to the Gibbs free energy of a standard amount of substance (in chemistry one usually takes a quantity of 1 mol). It should be added that the chemical potential is a function of pressure, temperature, and other intensive variables.

Cubic phases or inverse hexagonal phases display disordered lipid chains and are therefore phases typically occurring at higher temperatures. How does one know how these structures look like? The most common methods to determine lipid membrane structures are X-ray and neutron diffraction. In the following we briefly outline some principles of X-ray diffraction. 2 X-Ray Diffraction One of the most important methods to determine the structures of membranes is X-ray diffraction (Franks and Levine, 1981).

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Thermal Biophysics of Membranes by Thomas Heimburg

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