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coenzyme

(Encyclopedia)coenzyme kō-ĕnˈzīm [key], any one of a group of relatively small organic molecules required for the catalytic function of certain enzymes. A coenzyme may either be attached by covalent bonds to a ...

star

(Encyclopedia)star, hot incandescent sphere of gas, held together by its own gravitation, and emitting light and other forms of electromagnetic radiation whose ultimate source is nuclear energy. The universe co...

earth, in geology and astronomy

(Encyclopedia)CE5 A. Cross section of the earth, showing its shells B. Detailed cross section of the crust and upper mantle: The lithosphere consists of the hard rock in the crust and upper mantle, lying above t...

Vatican City

(Encyclopedia)CE5 Vatican City vătˈĭkən [key] or Holy See, officially Holy See (State of the Vatican City), independent state (2015 est. pop. 1,000), 108.7 acres (44 hectares), within the city of Rome, Italy...

tennis

(Encyclopedia)CE5 Tennis court tennis, game played indoors or outdoors by two players (singles) or four players (doubles) on a level court. In 1900 the international team competition known as the Davis Cup t...

Grant, Ulysses Simpson

(Encyclopedia)Grant, Ulysses Simpson, 1822–85, commander in chief of the Union army in the Civil War and 18th President (1869–77) of the United States, b. Point Pleasant, Ohio. He was originally named Hiram Uly...

Islam

(Encyclopedia)Islam ĭslämˈ, ĭsˈläm [key], [Arab.,=submission to God], world religion founded by the Prophet Muhammad. Founded in the 7th cent., Islam is the youngest of the three monotheistic world religions ...

Europe

(Encyclopedia)CE5 Europe yo͝orˈəp [key], 6th largest continent, c.4,000,000 sq mi (10,360,000 sq km) including adjacent islands (2015 est. pop. 740,814,000). It is actually a vast peninsula of the great Euras...

Ontario, province, Canada

(Encyclopedia)CE5 Ontario ŏntârˈēō [key], province (2001 pop. 11,410,046), 412,582 sq mi (1,068,587 sq km), E central Canada. Before the arrival of Europeans the Ontario region was inhabited by several Al...

Vietnam War

(Encyclopedia)Vietnam War, conflict in Southeast Asia, primarily fought in South Vietnam between government forces aided by the United States and guerrilla forces aided by North Vietnam. The war began soon after th...