Apparent persistence length

Absence of surface interactions that effect the conformation of the macromolecules is, however, not the rule. Below we will discuss examples of how the molecular conformation can be effected by specific interaction with the substrate. Obviously, one cannot regard the apparent persistence length of the adsorbed molecules as a characteristic value for the chain flexibility. 

Ghosh S, Li X, Reed CE, Reed WF. Apparent persistence lengths and diffusion behavior of high molecular weight hyaluronate. Biopolymers 1990 30 1101-1112. 

Reed WF, Ghosh S, Medjahdi G, Francois J. Dependence of polyelectrolyte apparent persistence lengths, viscosity, and diffusion on ionic strength and linear charge density. Macromolecules 1991 24 6189-5198. 

Apparent persistence length and large-scale properties 67... 

A useful, although nonrigorous, approach to assessing the possibility of branching, cross-linking, or collapse of a polymer is to use the experimental value of<5 >, which will inseparably contain any excluded volume effects, and equate this in the coil limit to an expression involving the apparent persistence length, L, which itself embodies both the intrinsic and excluded volume effects in<5">[12, 13] ... 

Nordmeier and Dauwe [282] reported static light scattering experiments on polystyrene sulphonate at 0.005 m c 2 m and analyzed the data by a worm-like chain model. The resulting total apparent persistence length is compared to the data of [210] in Fig. 18. The agreement is quite poor, and the data of [282] do not follow at all the scaling-law (solid line in Fig. 18). 

J. Bednar, P. Furrer, V. Katritch, A. Z. Stasiak, J. Dubochet, and A. Stasiak, /. Molec. Biol., 254, 579 (1995). Determination of DNA Persistence Length by Cryo-Electron Microscopy. Separation of the Static and Dynamic Contributions to the Apparent Persistence Length of DNA. 

---