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Spemann, Hans
(Encyclopedia) Spemann, HansSpemann, Hanshäns shpāˈmän [key], 1869–1941, German embryologist. He was professor of zoology (1919–35) at the Univ. of Freiburg. By transplanting embryonic tissue to a…Geissler tube
(Encyclopedia) Geissler tubeGeissler tubegīsˈlər [key], gas discharge tube in which light is produced when an electric discharge passes through the rarefied gas in the tube. The color of the glow…Tiresias
(Encyclopedia) TiresiasTiresiastīrēˈshəs, –sēəs [key], in Greek mythology, a blind soothsayer who appears in many legends. According to one myth, when he saw Athena bathing she blinded him, but by…apsis
(Encyclopedia) CE5 Apsis points, or apsides, in the earth's orbit: At perihelion the earth is closest to the sun and at aphelion it is farthest from the sun. apsis (pl. apsides), point in the…Orpheus
(Encyclopedia) OrpheusOrpheusôrˈfēəs, ôrˈfy&oomacr;s [key], in Greek mythology, celebrated Thracian musician. He was the son of Calliope by Apollo or, according to another legend, by Oeagrus, a…exchange
(Encyclopedia) exchange, mutual transfer of goods, money, services, or their equivalents; also the marketplace where such transfer occurs, such as a stock exchange or a commodity exchange (see…pollination
(Encyclopedia) pollination, transfer of pollen from the male reproductive organ (stamen or staminate cone) to the female reproductive organ (pistil or pistillate cone) of the same or of another…neurotransmitter
(Encyclopedia) neurotransmitter, chemical that transmits information across the junction (synapse) that separates one nerve cell (neuron) from another nerve cell or a muscle. Neurotransmitters are…incense-tree
(Encyclopedia) incense-tree, common name for members of the Burseraceae, a family of sometimes deciduous shrubs and large trees found chiefly in tropical America and NE Africa. The name derives from…Institut de France
(Encyclopedia) Institut de FranceInstitut de FranceăNstētüˈ də fräNs [key], cultural institution of the French state. Founded in 1795 by the Directory, it replaced five learned societies that had…Trending
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