Medical Dictionary Definitions A-Z List
Medical Dictionary Definitions A - Z - «R»:
Robertsonian translocation: A common and significant type of chromosome rearrangement that is formed by fusion of the whole long arms of two acrocentric chromosomes (chromosomes with the centromere near the very end). One in about 900 babies is born with a Robertsonian translocation making it the mo...
Robo: Street name for the cough syrup Robitussin which contains dextromethorphan (DXM)....
Robotripping: Street name for the high produced by abuse of the cough syrup Robitussin which contains dextromethorphan....
Robust: In statistics, a term applied to a test or procedure that is not seriously disturbed by violations of the assumptions on which it is based. For example, it was an "unexpected and robust difference in the rate of events." (Dr. Harold J. Burstein, in The New England Journal of Medicine, Oct 9...
Rochalimaea quintana: Now preferentially referred to as Bartonella quintana, this is an unusual rickettsial organism that can multiply within the gut of the body louse and then can be transmitted to humans. Transmission to people can occur by rubbing infected louse feces into
abraded (scuffed) ski...
Rock (drug): A street name given to cocaine that has been processed from cocaine hydrochloride to a ready-to-use free base for smoking. Rather than requiring the more volatile method of processing cocaine using ether, rock cocaine (also called crack) is processed with ammonia or sodium bicarbonate (...
Rocky Mountain spotted fever (RMSF)
Rocky Mountain spotted fever (RMSF): An acute febrile
(feverish) disease initially recognized in the Rocky Mountain states, caused by Rickettsia rickettsii transmitted by hard-shelled (ixodid) ticks. Occurs only in the Western Hemisphere. Anyone frequenting tick-infested areas is at risk for RMSF.
Rocky Mountain wood tick
Rocky Mountain wood tick: A tick that can transmit R. rickettsii, the agent of Rocky Mountain spotted fever. This tick is found in the Rocky Mountain states and in southwestern Canada. The life cycle of this tick may require up to 2 to 3 years for completion. Adult ticks feed primarily on large mamm...
Rod: A type of specialized light-sensitive cell (photoreceptor) in the retina of the eye that provides side vision and the ability to see objects in dim light (night vision).
By contrast, the cones are the retinal photoreceptors that provide sharp central vision and color vision....
Rod Beals: See: Beals, Rodney K....
Rodbell: See: Rodbell, Martin...
Rodbell, Martin: (1925-1998) American biochemist and molecular endocrinologist who shared the Nobel Prize in 1994 in Physiology or Medicine for his discovery of G-proteins and the principles of signal transduction in cellular communication.
Martin Rodbell was born in Baltimore, Maryland, the son of ...
Rodenticidal: Capable of killing rats or other rodent pests or preventing them from damaging food, crops, etc....
Rodenticide: A chemical or other agent used to destroy rats or other rodent pests or prevent them from damaging food, crops, etc. Rat poison is a familiar rodenticide....
Rodney K. Beals
Rodney K. Beals: See: Beals, Rodney K....