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brownie

(Encyclopedia)brownie, in Celtic folklore, household spirit associated with farmsteads. Brownies help with chores, but, if criticized, they will make mischief, such as spoiling crops. If payment other than food is ...

ecology

(Encyclopedia)ecology, study of the relationships of organisms to their physical environment and to one another. The study of an individual organism or a single species is termed autecology; the study of groups of ...

crayfish

(Encyclopedia)crayfish or crawfish, freshwater crustacean smaller than but structurally very similar to its marine relative the lobster, and found in ponds and streams in most parts of the world except Africa. Cray...

hydrogen peroxide

(Encyclopedia)hydrogen peroxide, chemical compound, H2O2, a colorless, syrupy liquid that is a strong oxidizing agent and, in water solution, a weak acid. It is miscible with cold water and is soluble in alcohol an...

aniline

(Encyclopedia)aniline ănˈəlĭn [key], C6H5NH2, colorless, oily, basic liquid organic compound; chemically, a primary aromatic amine whose molecule is formed by replacing one hydrogen atom of a benzene molecule w...

Jefferson, Territory of

(Encyclopedia)Jefferson, Territory of, in U.S. history, region that roughly encompassed the present-day state of Colorado, although extending 2° farther south and 1° farther north, organized by its inhabitants (1...

X-ray crystallography

(Encyclopedia)X-ray crystallography, the study of crystal structures through X-ray diffraction techniques. When an X-ray beam bombards a crystalline lattice in a given orientation, the beam is scattered in a defini...

adenine

(Encyclopedia)adenine ădˈənĭn, –nīn, –nēn [key], organic base of the purine family. Adenine combines with the sugar ribose to form adenosine, which in turn can be bonded with from one to three phosphoric ...

biophysics

(Encyclopedia)biophysics, application of various methods and principles of physical science to the study of biological problems. In physiological biophysics physical mechanisms have been used to explain such biolog...

Bleuler, Eugen

(Encyclopedia)Bleuler, Eugen oiˈgən bloiˈ lər [key], 1857–1939, Swiss psychiatrist. He taught (1898–1927) at the Univ. of Zürich, serving concurrently as director of Zürich's Burghölzi Asylum. Bleuler is...