Category: A

A hand-driven crank used instead of a bicycle or treadmill to measure cardiopulmonary conditioning or health.  

A measurable amount of time; e.g., the length of time used in standardized sleep studies (usually 30 sec to 1 min), or the duration of a particular geological or biological event, as indicated in earth sciences.  

Nosebleed due to handling packing trays containing certain dyes.  

An enzyme that produces autolysis, or cell digestion.  

An enzyme that catalyzes the conversion of starch to sugar.  

An enzyme that catalyzes the attaching of an amino acid to the appropriate transfer ribonucleic acid.  

An enema in which two contrast agents, thick barium sulfate and air, are introduced simultaneously under fluoroscopic control, followed by multiple radiographs of the colon. This technique produces better visualization of mucosal lining lesions, such as polyps or diverticula, than barium enemas performed without air.  

An infrequently used term for nonbacterial thrombotic endocarditis.  

Infective endocarditis with a rapid onset, usually a few days to 2 weeks. The infection is typically caused by virulent organisms such as Staphylococcus aureus, which may rapidly invade and destroy heart valvular tissue and also metastasize to other organs or tissues.  

A thin surface layer of the tooth, thought to be solid without individual enamel rods or prisms.