Water Transport Mechanisms: Water Movement Through Lipid Bilayers, Pores, and Plasma Membranes . Theory and Reality. Alan Finkelstein. Wiley-Interscience, New York, 1987. xii, 228 pp., illus. $39.95. Distinguished Lecture Series of the Society of General Physiologists, vol. 4.

Science ◽  
1988 ◽  
Vol 240 (4849) ◽  
pp. 228-228
Author(s):  
David C. Dawson
PEDIATRICS ◽  
1971 ◽  
Vol 48 (6) ◽  
pp. 1004-1005

Nassau County (N.Y.) Pediatric Postgraduate Lecture Series 1971-1972: Weekly lectures are sponsored by the Nassau County Medical Center for practicing pediatricians on Long Island each Thursday at 11:30 A.M. in the Recreation Activities Building on the Medical Center Grounds. American Academy of General Practice credit has been applied for; there is no registration fee. Further information and a complete program are available from P. J. Collipp, M.D., Department of Pediatrics, Nassau County Medical Center, 2201 Hempstead Turnpike, East Meadow, L.I., New York 11554.


1956 ◽  
Vol 2 (4) ◽  
pp. 203-208 ◽  
Author(s):  
Daniel C. Pease

Epithelia noted for their water transport have been studied by electron microscopy with particular emphasis upon basal specializations. Epithelia of the submaxillary gland, choroid plexus, and ciliary body are described in this article, and compared with previous observations on the kidney. The basal surface of all these epithelia is tremendously expanded by folds which penetrate deeply into the cytoplasm. In the submaxillary gland this is particularly notable in cells of the serous alveoli and in the secretory ducts. In these instances the folds have a fairly regular distribution and have a marked tendency to turn back upon themselves and so form repeating S-shaped patterns. In the choroid plexus the penetrating basal folds are limited to the lateral regions of each ependymal cell where they blend with the intercellular membranes that are also folded. In the epithelium of the ciliary body it is the inner layer that is specialized. The surface adjacent to the cavity of the eye penetrates irregularly, nearly through the full depth of the cell layer. The exposed surface is, in a fundamental sense, the basal surface of this epithelial layer. It is apparent that the pattern of folding is quite distinctive in the different epithelia. Therefore, the specializations should be regarded as analogous rather than homologous. Topographic considerations presumably limit the manner in which basal cell surfaces might be expanded. Penetrating folds would seem to represent almost the only possible solution.


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