Category: H

An enzyme that catalyzes the addition of hydrogen to a compound in reduction reactions. An enzyme that catalyzes reduction by molecular hydrogen.  

A mercury-containing drug with antibacterial and antifungal activity, used to treat skin and ear infections. It is applied in a cream, solution, dusting powder, or pessary and has the toxic effects of mercury.  

A channel within the vitreous humor of the eye. It extends from the center of the optic disk, where it communicates with the lymph spaces of the optic nerve, to the posterior wall of the lens. Canalis hyaloideus; a canal in the vitreous body of the eye extending from the optic papilla to the central…

A fetal artery lying in the hyaloid canal of the eye and supplying the lens. A fetal artery that supplies nutrition to the lens. It disappears in the later months of gestation.  

A fluid-filled swelling of the bursa in front of the kneecap, often resulting from frequent kneeling. Treatment and prevention is by avoidance of kneeling. An inflammation of the bursa in front of the knee-cap, often mistaken for some disease in the joint itself. Also referred to as prepatellar bursitis, this condition involves the inflammation of…

A group of symptoms that are due to a disorder of the sympathetic nerves in the cervical (neck) region. The syndrome consists of a constricted pupil, drooping of the upper eyelid (ptosis), and an absence of sweating over the affected side of the face.  

Warm-blooded: able to maintain a constant body temperature independently of, and despite variations in, the temperature of the surroundings. Mammals (including man) and birds are homoiothermic.  

Describing the sex that produces only one kind of gamete, which carries the same sex chromosome, and that therefore does not determine the sex of the offspring. In humans women are the homogametic sex: each egg cell carries an X chromosome.  

A specially trained therapist who works with public health nurses and other health professionals in providing bedside care to patients at home. The patients receiving such care generally are medically indigent persons suffering a chronic illness. An operative affiliated with a domiciliary care establishment, offering analogous assistance to a patient within the confines of their…

The liver of a patient with cirrhosis, which has a knobby appearance caused by regenerating nodules separated by bands of fibrous tissue. Degeneration of the liver characterized by fatty changes, fibrous scarring, nodular degeneration, and atrophy of the liver with the surface covered with brown or yellow nodules. This condition is seen in chronic alcoholism…