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Journal of Cell Science, Vol 15, 679-692, Copyright © 1974 by Company of Biologists

Submitted on December 20, 1973

The Localization of Calcium and Phosphorus in Human Platelets

R. J. SKAER 1, P. D. PETERS 2, and J. P. EMMINES 3

1 Department of Medicine, Hills Road, Cambridge
2 Cavendish Laboratory, Cambridge
3 Department of Medicine, Hills Road, Cambridge, England

Large amounts of calcium and phosphorus have been found by electron-microprobe analysis in the dense bodies of frozen-dried, human platelets. The calcium and phosphorus occurred in a fixed ratio that was similar to that in dicalcium ATP. No other elements were detectable except chlorine. Minute, electron-dense disks were found in the surface membranes of glutaraldehyde-fixed platelets, and are very variable in number in any population of normal platelets. Both dense bodies and membrane granules are absent if platelets are fixed in the absence of calcium, and are also absent from aggregated platelets.

Submitted on December 20, 1973






© The Company of Biologists Ltd 1974