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Schwann, Theodor

(Encyclopedia)Schwann, Theodor tāˈōdōr shvän [key], 1810–82, German physiologist and histologist. He was a student of J. P. Müller and professor at the universities of Louvain (1838–48) and Liège (from 1...

Schäffle, Albert

(Encyclopedia)Schäffle, Albert älˈbĕrt shĕfˈlə [key], 1831–1903, German economist and sociologist. He taught economics at the universities of Tübingen and Vienna. His views were based partly on the ideali...

pier

(Encyclopedia)pier, in engineering, term applied to a mass of reinforced concrete or masonry supporting a large structure, such as a bridge. When piers are built on ground of poor bearing value, it is often necessa...

Stark, Johannes

(Encyclopedia)Stark, Johannes, 1874–1957, German physicist, Ph.D. Univ. of Munich, 1897. From 1900 until he retired in 1922, Stark served short stints on the faculties of several academic institutions, including ...

silo

(Encyclopedia)silo, watertight and airtight structure for making and storing silage. Silos vary in form from a covered pit, such as was used by the early Romans, to the modern storage tower, dating from the 19th ce...

part of speech

(Encyclopedia)part of speech, in traditional English grammar, any one of about eight major classes of words, based on the parts of speech of ancient Greek and Latin. The parts of speech are noun, verb, adjective, a...

perturbation

(Encyclopedia)perturbation pŭrˌtərbāˈshən [key], in astronomy and physics, small force or other influence that modifies the otherwise simple motion of some object. The term is also used for the effect produce...

fossil

(Encyclopedia)fossil, remains or imprints of plants or animals preserved from prehistoric times by the operation of natural conditions. Fossils are found in sedimentary rock, asphalt deposits, and coal and sometime...

Hagia Sophia

(Encyclopedia)Hagia Sophia häˈjə sōfēˈə, hāˈjēə, [key] [Gr.,=Holy Wisdom] or Santa Sophia, Turkish Ayasofya, originally a Christian church at Constantinople (now İstanbul, Turkey) and then a mosque unde...

chemical bond

(Encyclopedia)chemical bond, mechanism whereby atoms combine to form molecules. There is a chemical bond between two atoms or groups of atoms when the forces acting between them are strong enough to lead to the for...