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Alzheimer's disease
A disease of the nervous system characterized by a progressive dementia that leads to profound impairment in cognition and behavior. Dementia occurs in a number of brain diseases where the impairment in cognitive abilities represents a decline from…
Biography
Alzheimer, Alois (1864–1915)
Biography
Amano, Hiroshi (1960– )
Biography
Ambartsumian, Viktor Amazasp Amazaspovich (1908–1996)
Article
Amber
Most commonly, a generic name for all fossil resins, although it has been restricted by some to refer only to succinite, the mineralogical species of fossil resin that includes most of the Baltic Coast deposits. The time necessary to transform resin…
Article
Amblygonite
A lithium aluminum phosphate mineral of basic formula LiAl(PO4)(F). The structure of amblygonite consists of phosphate (PO4) groups of tetrahedra and AlO6 groups of octahedra. Each PO4 tetrahedron is connected to an AlO6 octahedron. Corner-sharing…
Biography
Amdahl, Gene (1922–2015)
Biography
Ames, Adelbert (1880–1955)
Biography
Ames, Oakes (1874–1950)
Article
Amethyst
The transparent purple to violet variety of the mineral quartz. Although quartz is perhaps the commonest gem mineral known, amethyst (see illustration) is rare in the deep colors that characterize fine quality. Amethyst is usually colored unevenly…
Biography
Amici, Giovanni Battista (1786–1863)
Biography
Amman, Johann Konrad (1663–1730)
Article
Amnesia
A significant, yet relatively selective loss of memory. Amnesia is a type of memory loss, often resulting from brain disease or injury (see illustration). The inability to remember can be temporary or permanent. In general, amnesia can be…
Biography
Ampère, André-Marie (1775–1836)
Biography
Amsler-Laffon, Jakob (1823–1912)
Biography
Anastasi, Anne (1908–2001)
Biography
Anaximander the Elder (c. 610–546 BC)
Article
Andalusite
A nesosilicate mineral, composition Al2SiO5, crystallizing in the orthorhombic system. Andalusite (Fig. 1) occurs commonly in large, nearly square prismatic crystals. The variety chiastolite has inclusions of dark-colored carbonaceous material…
Biography
Andersen, Dorothy H(ansine) (1901–1963)
Biography
Anderson, Carl David (1905–1991)
Biography
Anderson, Don Lynn (1933– )
Biography
Anderson, Edgar S(hannon) (1897–1969)
Video Biography
Anderson, John R.
Biography