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Ring nebula

(Encyclopedia)Ring nebula, planetary nebula in the northern constellation Lyra; cataloged as M57 or NGC 6720. It is perhaps the most famous and beautiful nebula of this type. Its name describes the appearance of th...

neostigmine

(Encyclopedia)neostigmine nēˌōstĭgˈmēn, –mĭn [key], drug used to mimic the effects of stimulation of the parasympathetic nervous system. Along with several other drugs that have a similar mode of action, i...

Pavlov, Ivan Petrovich

(Encyclopedia)Pavlov, Ivan Petrovich ēvänˈ pētrôˈvĭch pävˈləf [key], 1849–1936, Russian physiologist and experimental psychologist. He was professor at the military medical academy and director of the p...

taste

(Encyclopedia)taste, response to chemical stimulation that enables an organism to detect flavors. In humans and most vertebrate animals, taste is produced by the stimulation by various substances of the taste buds ...

Independence

(Encyclopedia)Independence. 1 City (2020 pop. 6,064), seat of Buchanan co., NE Iowa; founded 1847. Located on the Wapsipinicon River, the town's grist mill ...

bubble chamber

(Encyclopedia)bubble chamber, device for detecting charged particles and other radiation by means of tracks of bubbles left in a chamber filled with liquid hydrogen or other liquefied gas. It was invented in 1952 b...

Alice

(Encyclopedia)Alice, city (2020 pop. 17,891), seat of Jim Wells co., S Tex.; inc. 1910. Long a cow town at a railroad junction, Alice remains a cattle-shipping center. Oil and natural gas are also impor...

Dalton's law

(Encyclopedia)Dalton's law [for John Dalton], physical law that states that the total pressure exerted by a homogeneous mixture of gases is equal to the sum of the partial pressures of the individual gases. The par...

ethane

(Encyclopedia)ethane ĕthˈān [key], CH3CH3, gaseous hydrocarbon. It is a continuous-chain alkane. As a constituent of natural gas, it is used for fuel. It can be prepared by cracking and fractional distillation o...

Gippsland

(Encyclopedia)Gippsland gĭpsˈlănd [key], geographical area, 13,655 sq mi (35,366 sq km), Victoria, SE Australia, E of Melbourne. There are deposits of coal, oil and natural gas (offshore), and limestone. Gold wa...