tuning: (music) calibrating something (an instrument or electronic circuit) to a standard frequency
calibration: the act of checking or adjusting (by comparison with a standard) the accuracy of a measuring instrument
heparin: a polysaccharide produced in basophils (especially in the lung and liver) and that inhibits the activity of thrombin in coagulation of the blood; it (trade names Lipo-Hepin and Liquaemin) is used as an anticoagulant in the treatment of thrombosis and in heart surgery