Cis

cis is a Latin word meaning "on the same side" and is the opposite of trans. See Ciskei and Transkei, also Cisalpine Gaul and Transalpine Gaul.


In chemistry, a double bond in which the greater radical on both ends is on the same side of the bond is called cis. Compare with trans.

In the example shown on the right, both hydrogen molecules, (and both fluorine molecules) are on the same side of the carbon chain. As the carbons are joined by a double bond, these cannot rotate around the molecule.

See Geometric isomerism for more on this.


In genetics, cis- is a prefix used in terms such as "cis-regulation" to signify the co-location of two or more genes on the same chromosome of a homologous pair.


In mathematics, eix = cos x + i sin x (see Euler's formula). Cis is a now seldom used abbreviation for "cosine plus i sine" (of x). Usually eix or exp(ix) is best used.



In the News

Study Proposes New Method To Investigate Genetic Hybridization
Hybridization is most likely to occur in recently evolved species, yet these are the species in which it is most difficult to detect owing to strong genetic similarity deriving from their recently shared ancestry. In the July 2005 issue of The American Naturalist, Peter Grant and colleagues propose a method that teases out an effect on their genetic similarity due to hybridization, based on the fact that sympatric populations can exchange genes whereas allopatric populations cannot.

Sexist Humor No Laughing Matter, Psychologist Says
Jokes about blondes and women drivers are not just harmless fun and games; instead, exposure to sexist humor can lead to toleration of hostile feelings and discrimination against women, according to new research. ?Specifically, we propose that sexist humor acts as a ?releaser?of prejudice,?says one of the researchers.

[Scary] Pregnant woman says 'maternal instinct' helped her kill attack
FORT MITCHELL, Ky. - A pregnant woman who killed her attacker said a maternal instinct helped her fight off the woman who investigators believe was after her unborn child."I do believe that I fought harder because it was for my child,"Sarah Brady told ABC's "Good Morning America"in interviews aired Sunday and Monday. "It is a maternal instinct to protect your child to the very end."Katherine Smith, 22, died Thursday after luring Brady to her apartment to pick up a package supposedly delivered to the wrong address. When Smith pulled out a knife and attacked the pregnant woman, Brady fought back, striking Smith on the head with an ash tray and stabbing her three times with her own knife, police said. Brady, 26, said she didn't know Smith before the two met at Smith's apartment and can't be certain why Smith wanted to kill her."I really am not sure what was going through her mind,"Brady told ABC. "The only thing I thought was that she was going to kill me and my child and that is the only thing that ran through my mind."

Chicano &Latino Artists in the Pacific Northwest
This exhibit features images and information from the collection of the Chicano/Latino Archive (at the Evergreen State College Library), "a research and teaching resource focusing on Chicano and Latino art and culture in the Pacific Northwest."Includes interpretative exhibition panels, profiles of two artists, and an extensive exhibit catalog. Some material also in Spanish. From The Evergreen State College in Olympia, Washington state.

Computers Pass Dosage Test For Thrombosis Drugs
The largest ever study into the administration of blood thinning drugs like Warfarin has concluded that dosages calculated by computer are at least as safe and reliable as those provided by trained medical professionals.

Keeping E. Coli Out Of Meat
A University of Illinois food scientist has discovered that certain solutions used by meat processors to extend shelf life actually do double duty as antimicrobial agents, killing such virulent foodborne pathogens as E. coli 0157:H7.

Download Piaf, Go to Jail
The French may be about to impose stiff penalties for illegally downloading copyright-protected files. Bruce Gain reports from Paris.

Colony Collapse Disorder Research Action Plan Announced By USDA
U.S. Department of Agriculture announced that USDA researchers have finalized an action plan for dealing with colony collapse disorder (CCD) of honey bees. The action plan coordinates the federal strategy in response to CCD.

Big Q: What's at Earth's Core?
Rock, molten metal and more rest beneath our feet. In the Wired Wiki.

[Ironic] LONDON: A jailed cocaine dealer is working as Santa Claus on
John Tams, who dons beard, boots and red suit to work in a cafe's Christmas grotto, said he wanted to give something back to the community...


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