The serine proteases, cofactors and cell-receptor molecules that comprise the haemostatic mechanism are highly conserved modular proteins that have evolved to participate in biochemical reactions in blood coagulation, anticoagulation and fibrinolysis. Blood coagulation is initiated by exposure of tissue factor, which forms a complex with factor VIIa and factor X, which results in the generation...

Dr. Nelson is an endoscopist, and his technique involves introducing a small Geiger counter through an esophagoscope (or sigmoidoscope) and recording counting rates over the surface of the organ being examined in a patient who has received 500 uc. Of p32 the day before the exam. A positive result is obtained when a clear increase in counting rate is observed at some area as the counter is moved...