Americium: Symbol: Am. A man-made metallic element whose isotopes Am-237 through Am-246 are all radioactive. Americium must be handled with great care to avoid personal contamination. Trace quantities of americium are widely used in smoke detectors. It is also used in bone mineral analysis and as a radiation source for radiotherapy.
Americium was discovered in 1944 at the wartime metallurgical laboratory at the University of Chicago as the result of successive neutron capture reactions by plutonium isotopes in a nuclear reactor.
- Ames test
Ames test: A test developed in 1974 by Bruce N. Ames for identifying possible carcinogens by studying their mutagenic effect on bacteria. The Ames test is widely used test to detect possible chemical carcinogens. It is based on mutagenicity in Salmonella bacteria.
- Ames, Bruce N.
Ames, Bruce N.: American biochemist and geneticist (1928-) who developed the Ames test for chemical mutagens. Ames attended Cornell University from 1946 to 1950, receiving his B.A. degree in chemistry/biochemistry. He then moved to the California Institute of Technology for his graduate study under Herschel K. Mitchell, a former postdoctoral fellow of George Beadle, in […]
Amine: A chemical compound containing nitrogen. Amines are derived from ammonia.
- Amini, Fariborz
Amini, Fariborz: Iranian-born American psychiatrist (1930-2004), at the University of California, San Francisco (UCSF), known for using science to study the phenomenon of love. In his work, Amini explained “how lingering but forgotten impressions, like a smell or sound associated with a person or a positive experience, become embedded in the mind’s memory banks, where […]
- Amino acid
Amino acid: One of the20 building blocks from which proteins are assembled. Isoleucine, leucine, lysine, phenylalanine, threonine, tryptophan, and valine are deemed ‘essential’ amino acids because the human body cannot make them and they must be obtained in the diet. Amino acids are sometimes taken orally in supplement form.