A diffusion equation approach to spin diffusion in biomolecules

Krishnan, V. V. ; Murali, N. ; Anil Kumar, (1989) A diffusion equation approach to spin diffusion in biomolecules Journal of Magnetic Resonance (1969), 84 (2). pp. 255-267. ISSN 0022-2364

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Official URL: http://linkinghub.elsevier.com/retrieve/pii/002223...

Related URL: http://dx.doi.org/10.1016/0022-2364(89)90369-7


A theoretical description of 1H-1H dipolar nuclear spin relaxation in a multispin system has been worked out by forming a diffusion equation for a one-dimensional chain of equidistant spins. The spin-diffusion equation is formed from first principles by assuming nearest neighbor interactions for a molecule undergoing isotropic random reorientation. This equation describes diffusion only in the long correlation limit (for (ωτc > 1.118) and is solved for driven NOE experiments, for spins in a chain of infinite length (0 < × < ∞), or for spins in a chain of finite length (0 < × < L). The solutions are obtained using the method of the Laplace transform for specified initial and boundary conditions. The observed selectivity of the NOE transfer in driven NOE experiments on a biomolecule which has a correlation factor ωτc ∼ 3 is indeed in conformity with the predictions obtained from the spin-diffusion equation.

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ID Code:738
Deposited On:25 Sep 2010 05:06
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