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sneeze gas

(Encyclopedia)sneeze gas, poison gas used in riot control and chemical warfare. It is highly irritating to the nose and throat; inhalation of the substance causes sneezing and coughing, but rarely causes permanent ...

tissue culture

(Encyclopedia)tissue culture, the propagation of plants through the placement of small amounts of undifferentiated tissue or single cells in an artificial environment. The tissue is placed in a nutrient medium that...

Wuzhou

(Encyclopedia)Wuzhou wo͞oˈjōˈ [key], city (1994 est. pop. 236,200), E Guangxi Zhuang Autonomous Region, S China, a port on the Xi River at the mouth of the Gui River. It is an important trade and shipping cente...

Yibin

(Encyclopedia)Yibin ē-bĭn [key], city (1994 est. pop. 261,300), S Sichuan prov., China. It is a commercial and communications center at the junction of the Min and the Chang rivers, the last port for upriver traf...

Rauma

(Encyclopedia)Rauma rouˈmä [key], Swed. Raumo, city (1996 pop. 37,914), Western Finland prov., SW Finland, on the Gulf of Bothnia. It is Finland's leading western port and has wood, paper, chemical, leather, muni...

San Marcos, University of

(Encyclopedia)San Marcos, University of, at Lima, Peru; the first university in South America; founded 1551 by the Spanish king Charles I (Holy Roman Emperor Charles V) and recognized by papal bull in 1571; closed ...

Prince George

(Encyclopedia)Prince George, city (1991 pop. 69,653), central British Columbia, Canada, at the confluence of the Fraser and Nechako rivers. It is a railroad division point and a distribution center for a lumber reg...

Perm

(Encyclopedia)Perm pyĕrm [key], city (1990 est. pop. 1,090,000), capital of Perm Territory, NE European Russia, on the Kama River. It is a transfer center for rail and river traffic and a major producer of machine...

Cartesian coordinates

(Encyclopedia)CE5 Cartesian coordinates Cartesian coordinates kärtēˈzhən [key] [for René Descartes], system for representing the relative positions of points in a plane or in space. In a plane, the point P...

poison gas

(Encyclopedia)poison gas, any of various gases sometimes used in warfare or riot control because of their poisonous or corrosive nature. These gases may be roughly grouped according to the portal of entry into the ...