| coin-counting | A sliding movement of the tips of the thumb and index finger, occurring in paralysis agitans. (05 Mar 2000) |
|---|---|
| whole-body counting | Measurement of radioactivity in the entire human body. (12 Dec 1998) |
| scintillation counting | Technique for measuring quantity of a radioactive isotope present in a sample. In biology, liquid scintillation counting is mainly used for emitters such as (14)C, (35)S and 32)P and particularly for the low energy emission of 3H. Gamma emissions are often measured by counting the scintillations that they cause in a crystal. Autoradiographic images can be enhanced by using a screen of scintillant behind the film. (18 Nov 1997) |
| Zappert counting chamber | A special, standardised glass slide used for counting cells (especially erythrocytes and leukocytes) and other particulate material in a measured volume of fluid; the central portion is precisely ground in such a manner that the uniformly flat surface is exactly 0.1 mm lower than that of two parallel ridges on which a special, uniformly flat coverslip may be placed; accurately etched lines on the flat central portion form the boundaries of groups of squares of known areas, thereby providing the basis for determining the volume of fluid in which the cells are counted. Glass slides of this type are frequently known as haemocytometers. (05 Mar 2000) |
| ventricular plateau | A level diastolic portion of the intraventricular blood pressure curve, representing graphically an equilibrium or final state of filling. (05 Mar 2000) |
| plateau | A flat elevated segment of a graphic record. Origin: Fr. (05 Mar 2000) |
| plateau iris | In angle-closure glaucoma, a flat appearance of the iris rather than a forward convexity. (05 Mar 2000) |
| Plateau, Joseph Antoine Ferdinand | <person> Belgian physicist, 1801-1883. See: Plateau-Talbot law. (05 Mar 2000) |
| plateau phase | <oncology> Stable stage of disease in multiple myeloma following good response to anti-cancer treatment. (31 Dec 1997) |
| plateau pulse | A slow, sustained pulse. (05 Mar 2000) |
| Plateau-Talbot law | When successive light stimuli follow each other sufficiently rapidly to become fused, their apparent brightness is diminished. (05 Mar 2000) |