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Look up: biuret

  1. Biuret
    Bi'u·ret noun [ Prefix bi- + urea .] (Chemistry) A white, crystalline, nitrogenous substance, C 2 O 2 N 3 H 5 , formed by heating urea. It is intermediate between urea and cyanuric acid.
    Found on http://www.encyclo.co.uk/webster/B/59

  2. biuret
    <chemistry> A white, crystalline, nitrogenous substance, C2O2N3H5, formed by heating urea. It is intermediate between urea and cyanuric acid. ... Origin: Pref. Bi- + urea. ... Source: Websters Dictionary ... (01 Mar 1998) ...
    Found on http://www.mondofacto.com/facts/dictiona

  3. Biuret
    `Biuret` is a condensation compound of urea, equivalent to two molecules of urea less one of ammonia. It is a white solid soluble in hot water and decomposes at 186-189 ðC. The parent compound can be prepared by heating urea above the melting point at which temperature ammonia is expelled. : 2 CO(NH2)2 -> H2N-CO-NH-CO-NH2 + NH3 ↑ `A biuret` is also a functional group and a class of organic compounds with the general structure RHN-CO-NR-CO-NHR...
    Found on http://en.wikipedia.org/wiki/Biuret

  4. biuret
    (bi´u-rәt) a urea derivative that forms a chelate having an intense violet-red color with copper sulfate in alkaline solution; this reaction is known as the biuret reaction. The same reaction also occurs when compounds having two or more adjacent peptide bonds (for example, proteins), are reacted with copper...
    Found on http://www.mercksource.com/pp/us/cns/cns

  5. biuret
    A derivative of urea obtained by heating, eliminating one NH3 between two ureas. Used in protein determinations. Syn: carbamoylurea
    Found on http://www.stedmans.com/section.cfm/45


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21 November 2009

This day in history:
On 21st November 1974 the Provisional IRA plants bombs in two Birmingham pubs: the Mulberry Bush and the Tavern in the Town. Twenty-one people die and 182 are injured. A few minutes before the explosions a warning had been telephoned to the local newspaper, the Birmingham Post and Mail, but it was far too late. The first Birmingham bomb, at the Mulberry Bush pub in the basement of the Rotunda, a 20-storey office and retail complex and it exploded six minutes after the telephone warning. There was not enough time for police to clear the area. Earlier that year nine soldiers were killed when a bomb exploded on a coach on the M62 near Bradford, while two bombs in Guildford killed four soldiers and injured scores of other people. read more

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