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DictionarySeegridWettstein, Richard Wettstein, Richard Born June 30, 1863, in Vienna; died Aug. 10, 1931, in Trinz, in the Tirol. Austrian botanist; honorary member of the Academy of Sciences of the USSR (1927). Beginning in 1892, Wettstein was a professor at the German University in Prague; from 1899 he was a professor at the university and director of the Botanical Institute and Garden in Vienna. He was the author of the theory concerning the origin of a perfect (bisexual) flower of angiosperms from certain unisexual (both male and female) flowers of the Gymnospermae and of the phylogenetic classification system based on this theory (Guide to the Taxonomy of Plants, vols. 1-2, 1901-08; Russian translation, vols. 1-2, 1903-12). Wettstein was one of the creators of the morphological and geographical method in plant taxonomy. He discovered the phenomenon of seasonal dimorphism in flowering plants. Wettstein maintained Lamarckian views on questions of evolution. REFERENCESVul’f, E. V. “Rikard Vetshtein [Nekrolog].” Priroda, 1932, no. 4.
Janchen, E. “Richard Wettstein.” Österreichische BotanischeZeitschrift, 1933, vol. 82, fasc. 1-2. (Contains a list of Wettstein’s works.)
Wetzel grid
grid [grid] 1. a grating.2. in radiology, a device consisting essentially of a series of narrow lead strips closely spaced on their edges and separated by spacers of low density material; used to reduce the amount of scattered radiation reaching the x-ray film.3. a chart with horizontal and perpendicular lines for plotting curves.Amsler grid see Amsler charts.baby grid a direct-reading chart on infant growth.cross-hatched grid two linear grids that are superimposed at right angles to each other, used for maximal scatter cleanup. Cross-hatched grids are fabricated by sandwiching two linear grids together so that their grid strips are perpendicular. From Bushong, 2001.grid cutoff differences in radiographic intensity that are caused by improper focusing of the lead lines of a grid.focused grid a linear grid in which all of the lead strips are aligned in a tilted fashion toward a centering point.linear grid a grid designed to permit the passage of the primary beam by having lead lines aligned in the same direction separated by radiolucent interspacing material. There are two types, parallel and focused.Wetzel grid a direct-reading chart for evaluating physical fitness in terms of body build, developmental level, and basal metabolism.Wet·zel grid (wets'ĕl), a chart used to plot changes in height, weight, physical fitness, and related aspects of physical development in children and adolescents. Now more commonly called growth curves, this technique is obsolete.Wetzel grid (wĕt′sĕl) [Norman C. Wetzel, U.S. pediatrician, b. 1897] A graph for use in evaluating growth and development in children aged 5 to 18 years.Wetzel, Norman C., U.S. pediatrician, 1897-1984. Wetzel grid - chart of growth, plotting height, weight, physical fitness and related aspects of young and adolescent children. |