Download DNA INTERACTIONS WITH POLYMERS AND SURFACTANTS by Rita Dias, Björn Lindman PDF

By Rita Dias, Björn Lindman

As a result strength advantages of biotechnology, curiosity within the interplay among DNA and surfactants and polymers has turn into more and more major. Now, DNA Interactions with Polymers and Surfactants offers an intensive, updated assessment of the topic, giving readers a foundation for knowing the standards resulting in complexation among DNA and varied cosolutes, together with steel ions, polyelectrolytes, spermine, spermidine, surfactants and lipids, and proteins.

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The change in direction du(s)/ds, which describes ðsÞ in the plane of bending and perpendicular to the curvature, corresponds to a vector r ðsÞ is the u(s), in other words, normal to the molecular line at s. The magnitude of r inverse of the radius of curvature R(s). For a uniformly bent rod, that is, when the radius of curvature is a constant R(s) ¼ R0, the integral is trivial, and the result is Ebend ¼ kB Tlbc L : 2R20 ð1:23Þ The bending coefficient lbc represents the local mechanical properties of the molecule.

35) and take the infinite chain-limit (see Eq. 11 it is clear that both the slope and the intercept change with salt concentration, that is, both C0 and loc are functions of the salt concentration, and lp must have a different salt dependence than loc alone. In other words, the projection length and the orientational correlation length are not the same molecular property. 44). 44). Although the snakelike chain is also a simplification and is not expected to hold for real molecules in general, as we will see in a moment, it does illustrate a difference between different definitions of persistence length and the rationale for lumping together definitions that involve integration (implicitly) over the orientational correlation function.

However, the projection length becomes chain-length dependent (as illustrated by the figure), albeit less so than, for example, RG. The strength of the projection length is that it makes different kinds of experimental approaches, as well as some theoretical ones, comparable. Often an experimental 26 POLYELECTROLYTES. PHYSICOCHEMICAL ASPECTS AND BIOLOGICAL SIGNIFICANCE observable can be calculated in the framework of the wormlike chain, and even if the molecule itself is not wormlike, it is possible to treat the projection length obtained by comparing the experimental results to the model calculation as an operational definition.

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