Debye screening constant

Debye screening constant k is set to 0.1. We treated the both terminals and hydrophilic residues of protein as ionized both in water and in vacuum. 

The actual Debye screening constant must be retained to give the correct decay at large distances from the surface. We determine the effective valence by requiring that the approximate solution give the correct surface potential and, after a little algebra, find that satisfies... 

Before considering a planar geometry, we derive a general expression for the Debye screening constant within the one-dimensional DH cell model. In... 

Figure 32 The PB (solid lines) and DH (dashed lines) potential and field profiles as a function of the distance from the center of a charged capillary of radius 20 A with surface charge density = —0.01 sq/A in the absence of added salt (only counterions are present) according to Eqs. [286], [288], and [291] the effect of using an average Debye screening constant in the DH expressions is shown by dotted lines.

Figure 42 The ratio of the Debye-Hiickel potential due to a finite straight line charge (Eq. [368], C = oo) to that of an infinite line charge (Eq. [364]) as a function of the perpendicular distance (in A) from the center of the finite line charge for several different lengths (L — 5,10,20,50 A) listed at the right a Debye screening constant of kd = 0.132 A was used, corresponding to 0.1 M monovalent salt and 0.02 M divalent salt.

Figure 45 The electrostatic persistence length (in A) of a finite line of charge (Eq. [373]) with linear charge density = 4.2 (B-DNA) as a function of the Debye screening constant Kd (in A ) the cv es correspond to different values of the length of the...

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