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thymine

(Encyclopedia)thymine thīˈmēn [key], organic base of the pyrimidine family. Thymine was the first pyrimidine to be purified from a natural source, having been isolated from calf thymus and beef spleen in 1893–...

organic chemistry

(Encyclopedia)organic chemistry, branch of chemistry dealing with the compounds of carbon. While it is only the fourteenth most common element on earth, carbon forms by far the greatest number of different compound...

guanine

(Encyclopedia)guanine gwäˈnēn [key], organic base of the purine family. It was reported (1846) to be in the guano of birds; later (1879–84) it was established as one of the major constituents of nucleic acids....

Aschersleben

(Encyclopedia)Aschersleben äˈshərslāˌbən [key], city, Saxony-Anhalt district, central Germany. An industrial city, it manufactures machine tools, chemicals, iron and steel, and wo...

Layton

(Encyclopedia)Layton, city (1990 pop. 41,784), Davis co., N Utah, between the Wasatch Range and Great Salt Lake. In an irrigated farm area served by the Weber basin project, it produces fruits and vegetables. Cattl...

Shipley

(Encyclopedia)Shipley, town (1991 pop. 28,815), West Yorkshire, N England, on the Aire River. Of its varied industries, light engineering and the manufacture of woolens and worsteds are the most important. Within t...

titanium

(Encyclopedia)titanium tītāˈnēəm, tĭ– [key] [from Titan], metallic chemical element; symbol Ti; at. no. 22; at. wt. 47.867; m.p. 1,675℃; b.p. 3,260℃; sp. gr. 4.54 at 20℃; valence +2, +3, or +4. Titani...

Tres Marías, Las

(Encyclopedia)Tres Marías, Las läs trās märēˈäs [key], archipelago, in the Pacific Ocean, c.60 mi (100 km) W of Nayarit state, Mexico. Of the four islands, two—María Madre, which is the largest (c.56 sq m...

Staraya Russa

(Encyclopedia)Staraya Russa stäˈrīə ro͞oˈsə [key] [Rus.,=Old Russia], city (1989 pop. 41,500), W European Russia, near Lake Ilmen. It is a health resort with salt springs and mud baths. It is one of the olde...

Tempe

(Encyclopedia)Tempe tĕmˈpē [key], city (1990 pop. 141,865), Maricopa co., S Ariz., in the Salt River valley, a suburb of Phoenix; inc. 1894. Its population has grown markedly since the 1970s with the expansion o...