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J Appl Physiol 73: 1034-1039, 1992;
8750-7587/92 $5.00
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Journal of Applied Physiology, Vol 73, Issue 3 1034-1039, Copyright © 1992 by American Physiological Society

ARTICLES

Graphite-like lubrication of mesothelium by oligolamellar pleural surfactant

B. A. Hills
Department of Physiology, University of New England, Armidale, New South Wales, Australia.

Six studies have been completed to reevaluate pleural surfactant as a possible boundary lubricant in mesothelial sliding. It is capable of remarkable antiwear action, giving a mean scar diameter on a standard "four-ball test" comparable to the best commercially available lubricants and reducing friction to values anticipated from lamellated solid lubricants such as graphite. Pleural surfaces displayed appreciable hydrophobicity, which was almost eliminated by rinsing with a lipid solvent from which phospholipid was recovered and quantified. These quantities indicated that equivalent of 7.3 adsorbed monolayers of surface-active phospholipid, which was in general agreement with the number of layers of a graphite-like surface coating visualized by electron microscopy by use of a novel fixation procedure that avoids conventional aldehydes known to destroy hydrophobic surfaces. Graphite-like (dry) lubrication by adsorbed surface-active phospholipid is discussed as an excellent lubrication system available wherever the distribution of fluid allows the pleura to make contact.


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