Evaluation of diffusion coefficients by means of an approximate steady-state condition in sedimentation velocity distributions.
Evaluation of diffusion coefficients by means of an approximate steady-state condition in sedimentation velocity distributions.
复制标题
通过沉降速度分布的近似稳态条件评估扩散系数。
DOI:
10.1016/j.ab.2015.08.017
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发表时间:
2015
影响因子:
2.9
通讯作者:
Scott DJ
中科院分区:
文献类型:
--
作者:
Scott DJ
This investigation examined the feasibility of manipulating the rotor speed in sedimentation velocity experiments to spontaneously generate an approximate steady-state condition where the extent of diffusional spreading is matched exactly by the boundary sharpening arising from negatives–cdependence. Simulated sedimentation velocity distributions based on the sedimentation characteristics for a purified mucin preparation were used to illustrate a simple procedure for determining the diffusion coefficient from such steady-state distributions in situations where the concentration dependence of the sedimentation coefficient,s=s0/(1 +Kc), was quantified in terms of the limiting sedimentation coefficient asc→ 0 (s0) and the concentration coefficient (K). Those simulations established that spontaneous generation of the approximate steady state could well be a feature of sedimentation velocity distributions for many unstructured polymer systems because the requirement thatKcoω2s0/Dbe between 46 and 183 cm−2is not unduly restrictive. Although spontaneous generation of the approximate steady state is also a theoretical prediction for structured macromolecular solutes exhibiting linear concentration dependence of the sedimentation coefficient,s=s0(1 −kc), the required value ofkis far too large for any practical advantage to be taken of this approach with globular proteins.
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DOI:
--
发表时间:
1998
期刊:
影响因子:
--
作者:
S. Harding;G. Berth;J. Hartmann;K. Jumel;H. Cölfen;B. Christensen
通讯作者:
B. Christensen
影响因子:
4.2
作者:
H. Fujita
通讯作者:
H. Fujita
DOI:
10.1039/c4an01060d
发表时间:
2014-10
期刊:
The Analyst
影响因子:
--
作者:
D. Scott;S. Harding;D. Winzor
通讯作者:
D. Scott;S. Harding;D. Winzor
DOI:
--
发表时间:
1963
期刊:
影响因子:
--
作者:
J. Creeth
通讯作者:
J. Creeth
DOI:
--
发表时间:
1965
期刊:
Proceedings of the Royal Society of London. Series B. Biological Sciences
影响因子:
--
作者:
L. W. Nichol;A. Ogston
通讯作者:
A. Ogston