Platelet Aggregation Following Heparin and Protamine Administration

Hparin increases the sensitivity of platelets to ADP and epinephrine as determined by platelet aggregation, and protamine added to heparinized blood not only reverses this effect, but decreases platelet sensitivity when it is added in concentration that neutralize heparIn.

Abstract

The influence of the defect concentration on the relaxation of space charges in Sr1-xNdxF2+x solid solutions has been investigated with the ionic-thermocurrent technique. A concentration domain of 0.004 up to 45 mol% has been used. As in the system Ba1-xLaxF2+x the space-charge relaxation band (high-temperature band) shifts to lower temperatures with increasing RF3 concentration. A percolation model has been used to explain these shifts. Most of the differences between the systems Sr1-xNdxF2+x and Ba1-xLaxF2+x are reducible to different dipolelike jumps supporting the charge transport: nearest-neighbor dipolelike jumps in Sr1-xNdxF2+x and next-nearest-neighbor dipolelike jumps in Ba1-xLaxF2+x. The charge transport may be interpreted qualitatively with a percolation mechanism.