Columbia Encyclopedia

(Encyclopedia) Nelson, Leonard, 1882–1927, German philosopher. On the faculty of the Univ. of Göttingen from 1909, he was interested in the use of critical method to establish a scientific foundation for philosop...

(Encyclopedia) petrology, branch of geology specifically concerned with the origin, composition, structure, and properties of rocks, primarily igneous and metamorphic, and secondarily sedimentary. It includes petrog...

(Encyclopedia) Alexander I, 1777–1825, czar of Russia (1801–25), son of Paul I (in whose murder he may have taken an indirect part). In the first years of his reign the liberalism of his Swiss tutor, Frédéric ...

(Encyclopedia) Permian period pûrˈmēən [key] [from Perm, Russia], sixth and last period of the Paleozoic era (see Geologic Timescale, tablegeologic timescale, table) from 250 to 290 million years ago. Many ma...

(Encyclopedia) diuretic dīˌyərĕtˈĭk [key], drug used to increase urine formation and output. Diuretics are prescribed for the treatment of edema (the accumulation of excess fluids in the tissues of the body), ...

(Encyclopedia) precipitation, in chemistry, a process in which a solid is separated from a suspension, sol, or solution. In a suspension such as sand in water the solid spontaneously precipitates (settles out) on st...

(Encyclopedia) Queloz, Didier Patrick, 1966–, Swiss astronomer, Ph.D. Univ. of Geneva, 1995. He has been a member of the faculty at the Univ. of Geneva since 2003 (professor from 2008) and since 2013 also has been...

(Encyclopedia) Kuznets, Simon ko͝oznĕtsˈ, kŭzˈnĕts [key], 1901–85, American economist, b. Kharkiv, Russia (now in Ukraine), grad. Columbia (B.S., 1923; M.A., 1924; Ph.D., 1926). He emigrated to the United St...

(Encyclopedia) Samuelsson, Bengt Ingemar, 1934–, Swedish biochemist, grad. Karolinska Institute (Ph.D. 1960, M.D. 1961). He was a professor at the Karolinska Institute from 1962 to 1966 and again from 1973; from 1...

(Encyclopedia) Wieschaus, Eric Francis, 1947–, American biologist and geneticist, b. South Bend, Ind., Ph.D. Yale 1974. He was a researcher at the European Molecular Biology Laboratory in Heidelberg, Germany, from...