| Hayem, Georges | <person> French physician, 1841-1933. See: Hayem's haematoblast, Hayem's solution, Hayem-Widal syndrome. (05 Mar 2000) |
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| Hayem's haematoblast | <haematology> A discoid cell (3m diameter) found in large numbers in blood, important for blood coagulation and for haemostasis by repairing breaches (small breaks) in the walls of blood vessels. Platelet _ granules contain lysosomal enzymes, dense granules contain ADP (a potent platelet aggregating factor) and serotonin (a vasoactive amine). They also release platelet-derived growth factor which presumably contributes to later repair processes by stimulating fibroblast proliferation. Synonym: thrombocytes. (09 Oct 1997) |
| Hayem's solution | <haematology> A blood diluent used prior to counting red blood cells. (05 Mar 2000) |
| Hayem-Widal syndrome | <clinical sign> An obsolete term for acquired haemolytic icterus. Synonym: Widal's syndrome. (05 Mar 2000) |