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Literature DB >> 7241090

Diffusion of calcium ions in retinal rods. A theoretical calculation.

Abstract

The Fick diffusion equation is combined with the Langmuir adsorption isotherm and the relevant equations from the Gouy-Chapman theory of the electrical diffuse double layer to demonstrate that the effective diffusion coefficient of calcium ions, both in the cytoplasm of the rod outer segment and within the aqueous space bounded by the disk membrane, should be reduced by a factor of 10-100 because these ions adsorb to phospholipids present in the disk membrane.

Entities: Chemical

Mesh：

Substances：
Calcium

Year: 1981 PMID： 7241090 PMCID： PMC2215421 DOI： 10.1085/jgp.77.4.475

Source DB: PubMed Journal: J Gen Physiol ISSN： 0022-1295 Impact factor: 4.086

31 in total

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10. Membrane characteristics and osmotic behavior of isolated rod outer segments.

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Journal: J Cell Biol Date: 1973-02 Impact factor: 10.539

12 in total

1. Does Ca2+ reach millimolar concentrations after single photon absorption in Drosophila photoreceptor microvilli?

Authors: M Postma; J Oberwinkler; D G Stavenga
Journal: Biophys J Date: 1999-10 Impact factor: 4.033

2. Longitudinal diffusion in retinal rod and cone outer segment cytoplasm: the consequence of cell structure.

Authors: David Holcman; Juan I Korenbrot
Journal: Biophys J Date: 2004-04 Impact factor: 4.033

3. Strength of Ca(2+) binding to retinal lipid membranes: consequences for lipid organization.

Authors: D Huster; K Arnold; K Gawrisch
Journal: Biophys J Date: 2000-06 Impact factor: 4.033

4. Spatial spread of activation and background desensitization in toad rod outer segments.

Authors: T D Lamb; P A McNaughton; K W Yau
Journal: J Physiol Date: 1981 Impact factor: 5.182

5. Depletion of calcium in the synaptic cleft of a calyx-type synapse in the rat brainstem.

Authors: J G Borst; B Sakmann
Journal: J Physiol Date: 1999-11-15 Impact factor: 5.182

6. Bleached pigment produces a maintained decrease in outer segment Ca2+ in salamander rods.

Authors: A P Sampath; H R Matthews; M C Cornwall; G L Fain
Journal: J Gen Physiol Date: 1998-01 Impact factor: 4.086

7. Nonideal mixing and phase separation in phosphatidylcholine-phosphatidic acid mixtures as a function of acyl chain length and pH.

Authors: P Garidel; C Johann; A Blume
Journal: Biophys J Date: 1997-05 Impact factor: 4.033