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Urea - Dictionary Definition and Overview |
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Urea : (noun)
1: the chief solid component of mammalian urine; synthesized
from ammonia and carbon dioxide and used as fertilizer
and in animal feed and in plastics [syn: carbamide]
Based on WordNet 2.0
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Urea : \U"re*a\, a. [NL. See Urine.] (Physiol. Chem.)
A very soluble crystalline body which is the chief
constituent of the urine in mammals and some other animals.
It is also present in small quantity in blood, serous fluids,
lymph, the liver, etc.
Note: It is the main product of the regressive metamorphosis
(katabolism) of proteid matter in the body, and is
excreted daily to the amount of about 500 grains by a
man of average weight. Chemically it is carbamide,
CO(NH2)2, and when heated with strong acids or
alkalies is decomposed into carbonic acid and ammonia.
It unites with acids to form salts, as nitrate of urea,
and it can be made synthetically from ammonium cyanate,
with which it is isomeric.
Urea ferment, a soluble ferment formed by certain bacteria,
which, however, yield the ferment from the body of their
cells only after they have been killed by alcohol. It
causes urea to take up water and decompose into carbonic
acid and ammonia. Many different bacteria possess this
property, especially Bacterium ure[ae] and Micrococcus
ure[ae], which are found abundantly in urines undergoing
alkaline fermentation.
Based on Webster's Revised Unabridged Dictionary
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Urea : Urea: A nitrogen-containing substance normally cleared from the blood by the BUN ) test.
Urea is of major historical significance. It was the first process , accidentally made urea. Wohler wrote his mentor Jons Berzelius, "I must tell you that I can make urea without the use of
kidneys, either man or dog. Ammonium cyanate is urea."
This pioneering experiment disproved the theory of vitalism, the concept that organic chemicals could only be modified chemically, but that living plants or animals were needed to produce them.
Wohler had also discovered that urea and ammonium cyanate had the same chemical formula but very different chemical properties. This was due to isomerism, the phenomenon in which two or more
chemical compounds have the same number and type of atoms but, because those atoms are arranged differently, each compound has different chemical properties.
Based on Webster's Revised Unabridged Dictionary (1913)
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Example Usage of Urea |
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nyarome_: @Urea あ、昨日は何も検索しなかったｗｗｗ |
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DJHeatDC: @Wale you better shout out that carryout so the Urea can give them more business lol |
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neta__: はやっ、もうそこまで進んだか RT @Urea: bing１２％ |
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