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Raman effect
Raman effect , appearance of additional lines in the spectrum of monochromatic light that has been scattered by a transparent material medium. The effect was discovered by C. V. Raman in 1928. The energy and thus the frequency and wavelength of the scattered light is changed as the light either im...
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Onychophora
Onychophora , small phylum with about 70 species of animals that are often called "missing links" between annelids (phylum Annelida ) and arthropods (phylum Arthropoda ). The thin cuticle and wormlike form of onychophorans are reminiscent of annelids, while the tracheal system and details of e...
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sky
sky apparent dome over the earth, background of the clouds, sun, moon, and stars. The blue color of the clear daytime sky results from the selective scattering of light rays by the minute particles of dust and vapor in the earth's atmosphere . The rays with longer wavelengths (the reds and yellows...
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Compton effect
Compton effect [for A. H. Compton ], increase in the wavelengths of X rays and gamma rays when they collide with and are scattered from loosely bound electrons in matter. This effect provides strong verification of the quantum theory since the theoretical explanation of the effect requires that on...
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coeducation
coeducation instruction of both sexes in the same institution. The economic benefits gained from joint classes and the need to secure equality for women in industrial, professional, and political activities have influenced the spread of coeducation. There were scattered examples of coeducation in t...
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denaturation
denaturation term used to describe the loss of native, higher-order structure of protein molecules in solution. Most globular proteins exhibit complicated three-dimensional folding described as secondary, tertiary, and quarternary structures. These conformations of the protein molecule are rather...
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Tiranë
Tiranë or Tirana , city (1989 pop. 238,057), capital of Albania and of Tiranë dist., central Albania, on the Ishm River. It is the largest city and the chief industrial and cultural center of the country. Tiranë is located on a fertile plain that yields a variety of agricultural p...
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Charles Glover Barkla
Charles Glover Barkla , 1877-1944, English physicist. He was professor of natural philosophy at Edinburgh from 1913. For his discovery of the characteristic X rays of elements he received the 1917 Nobel Prize in Physics. He evolved the laws of X-ray scattering and the laws governing the transmission...
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dispersion
dispersion in chemistry, mixture in which fine particles of one substance are scattered throughout another substance. A dispersion is classed as a suspension , colloid , or solution . Generally, the particles in a solution are of molecular or ionic size; those in a colloid are larger but too sma...
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Palm Sunday
Palm Sunday in the Christian calendar, the Sunday before Easter , sixth and last Sunday in Lent , and the first day of Holy Week . It recalls the entry of Jesus into Jerusalem riding upon an ass, when his followers shouted "Hosanna" and scattered palms in his path. In the Roman Catholic and ...
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