Medical Dictionary Definitions A-Z List
Medical Dictionary Definitions A - Z - «C»:
Change of life
Change of life: see menopause....
Change, single base
Change, single base: A change in which a single base in the DNA differs from the usual base at that position. These single base changes are also called SNPs or "snips."
Millions of SNP's have been cataloged in the human genome. Some SNPs such that which causes sickle cell are responsible for diseas...
Channel, ion: See: Ion channel....
Channelopathy: A disease involving dysfunction of an ion channel. Channelopathies are known that involve the ion channels for potassium, sodium, chloride and calcium. There are also channelopathies involving the acetylcholine receptor, the glycine receptor, and other receptors. Each channelopathy ca...
Chaperone: 1. Any protein that is required for the proper folding or assembly of another protein or protein complex without being a component of the final structure.
2. A woman who is present when a male physician examines a female patient.
3. Anyone present when a physician examines a patient of ...
Chapped lips: Dry, cracked or sore lips, usually in cold, windy, dry weather and less often in warm weather. Sun exposure can contribute to chapping of the lips. Licking or biting the lips does not help the situation.
The lips are more sensitive to chapping than the skin. Unlike the skin, the lips ...
Char syndrome: A genetic disorder characterized by patent ductus arteriosis and unusual facial features including a long philtrum (increase in the distance between the nose and upper lip), down-slanting palpebral fissures (eye slits), and thick lips as well as incurving fifth fingers.
Charbon: Known also as anthrax, charbon is a serious
bacterial infection. It is not primarily a human disease but rather an infection of
animals. Cattle, sheep, horses, mules, and some wild animals are highly susceptible.
Humans (and swine) are generally resistant to anthrax. Anthrax can take differ...
Charcoal, activated: See: Activated charcoal....
Charcot-Marie-Tooth disease: A genetic disease of nerves characterized by progressively debilitating muscle weakness, particularly of the limbs. The foremost feature is marked wasting of the distal extremities, particularly the peroneal muscle groups in the calves, resulting in "stork legs." The dis...
Charcot-Wilbrand syndrome: Loss of dreaming after a stroke. In more technical terms the syndrome is characterized by visual agnosia and the inability to revisualise images. Named for the French founder of modern neurology Jean-Martin Charcot (1825-1893) and the German neuro-ophthalmologist Hermann ...
Chargaff ratios: See: Chargaff rule....
Chargaff rule: The rule that in DNA there is always equality in quantity between the bases A and T and between the bases G and C. (A is adenine, T is thymine, G is guanine, and C is cytosine.) Named for the great Austrian-American biochemist Erwin Chargaff (1905-2002) at Columbia University who dis...
Chargaff's rule: See: Chargaff rule....
CHARGE association: A constellation of congenital malformations (birth defects). The name of the condition is an acronym of some of the most frequent features:
C = Coloboma (cleft) of the eye (80% of cases) and Cranial nerve abnormalities,
H = Heart malformation,
A = Choanal Atresia (blockage of...