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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...

Riemann, Bernhard

(Encyclopedia)Riemann, Bernhard (Georg Friedrich Bernhard Riemann) gāˈôrk frēˈdrĭkh bĕrnˈhärt rēˈmän [key], 1826–66, German mathematician. He studied at the universities of Göttingen and Berlin and w...

geopolitics

(Encyclopedia)geopolitics, method of political analysis, popular in Central Europe during the first half of the 20th cent., that emphasized the role played by geography in international relations. Geopolitical theo...

Sturm und Drang

(Encyclopedia)Sturm und Drang shto͝orm o͝ont dräng [key] or Storm and Stress, movement in German literature that flourished from c.1770 to c.1784. It takes its name from a play by F. M. von Klinger, Wirrwarr; od...

yttrium

(Encyclopedia)yttrium ĭtˈrēəm [key] [for Ytterby, a town in Sweden], metallic chemical element; symbol Y; at. no. 39; at. wt. 88.90585; m.p. about 1,522℃; b.p. 3,338℃; sp. gr. about 4.45; valence +3. Yttriu...

art history

(Encyclopedia)art history, the study of works of art and architecture. In the mid-19th cent., art history was raised to the status of an academic discipline by the Swiss Jacob Burckhardt, who related art to its cul...

Socinus, Laelius

(Encyclopedia)Socinus, Laelius lāˈlyō [key], 1525–62, Italian religious reformer. After becoming interested in Protestantism, Socinus left Italy in 1544 for the Swiss cantons to escape the newly established In...

hardness

(Encyclopedia)hardness, property of matter commonly described as the resistance of a substance to being scratched by another substance. The degree of hardness is relative, different substances being compared with o...

Göttingen

(Encyclopedia)Göttingen götˈĭng-ən [key], city, Lower Saxony, central Germany, on the Leine River. It is ...

Zinzendorf, Nikolaus Ludwig, Graf von

(Encyclopedia)Zinzendorf, Nikolaus Ludwig, Graf von nēˈkōlous lo͝otˈvĭkh gräf fən tsĭnˈtsəndôrf [key], 1700–1760, German churchman, patron and bishop of the refounded Moravian Church, b. Dresden. Rear...