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52 Topic Pages Found in Science and starting with the letter O
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Open Oak

any tree or shrub of the genus Quercus of the family Fagaceae ( beech family). This complex genus includes as many as 600, found chiefly in north

Open Oases

The term "oasis" is often taken in its metaphorical and very broad sense: a spot of life within an inhospitable environment. In that way, it has

Open Oats

cereal plants of the genus Avena of the family Gramineae ( grass family). Most species are annuals of moist temperate regions. The early history of

Open observatory

scientific facility especially equipped to detect and record naturally occurring scientific phenomena. Although geological and meteorological

Open Obsessive-compulsive disorder
Obsessive-compulsive disorder

Obsessions and the compulsive behaviors often associated with them are symptoms of an obsessive-compulsive disorder (OCD). Like many other mental

Open Obsidian

Obsidian is the best known glassy rock. It is a volcanic glass and is supposedly named after Obsidian, a Roman said to have brought the first

Open Ocean

interconnected mass of saltwater covering 70.78% of the surface of the earth, often called the world ocean. It is subdivided into four (or five) major

Open Ochoa, Ellen (1958 - )
Ochoa, Ellen (1958 - )

b. 1958 Electrical Engineer, Astronaut Education: B.S., San Diego State University, 1980; M.S., Stanford University, 1981, Ph.D., electrical

Ochoa, Severo, 1905-1993

Spanish-born US biochemist who was awarded a Nobel Prize for Physiology or Medicine in 1959 for the discovery of enzymes that catalyse the formation

Open Octane number
Octane number

figure of merit representing the resistance of gasoline to premature detonation when exposed to heat and pressure in the combustion chamber of an