See Also: platelet glycoprotein gpib-ix complex(medicine)
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masking (medicine) and platelet glycoprotein gpib-ix complex (medicine)


masking (medicine)


masking


1. The use of noise of any kind to interfere with the audibility of another sound. For any given intensity, low pitched tones have a greater masking effect than those of a high pitch.

2. In audiology, the use of a noise applied to one ear while testing the hearing acuity of the Other ear.

3. The hiding of smaller rhythms in the brain wave record by larger and slower ones whose wave form they distort.

4. In dentistry, an opaque covering used to camouflage the metal parts of a prosthesis.

5. In radiography, superimposition of an altered positive image on the original negative to produce an enhanced copy photographically.

See: subtraction.


platelet glycoprotein gpib-ix complex (medicine)


platelet glycoprotein gpib-ix complex
Platelet membrane glycoprotein complex essential for normal platelet adhesion and clot formation at sites of vascular injury. It is composed of three polypeptides, gpib alpha, gpib beta, and gpix. Glycoprotein ib functions as a receptor for von willebrand factor and for thrombin. Congenital deficiency of the gpib-ix complex results in bernard-soulier syndrome. The platelet glycoprotein gpv associates with gpib-ix and is also absent in bernard-soulier syndrome.