Note on the interpretation of lateral diffusion coefficients.
It is suggested that interpretation of lateral diffusion coefficients measured in membranes should include the effect of forces.
Biomedical subjects
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It is suggested that interpretation of lateral diffusion coefficients measured in membranes should include the effect of forces.
The mean reaction (encounter or absorption) time is calculated in terms of the system size and reaction probability parameters for three-dimensional systems with diffusion-controlled dynamics and in which there is spherical, prolate spheroidal or oblate spheroidal geometry. Analytical and numerical comparisons are made among the three geometries. For completeness, similar results are derived for a two-dimensional elliptically symmetrical system, and the probability of non-absorption (or reaction) is found for a semi-infinite three-dimensional space with prolate or oblate spheroidal symmetry.
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A percutaneous antecubital transvenous cholangiography technique using a flexible 20 gauge needle is described. The porcedure was successful in 6 patients with obstructive jaundice but failed in 2 patients without bile duct dilatation. The authors feel that this technique is easier and safer than present transvenous methods. Modifications for the femoral approach and use of the technique in pediatric patients are described.