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urea    音标拼音: [jɚ'iə]
n. 尿素

尿素

urea
n 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 [synonym: {urea}, {carbamide}]

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.
[1913 Webster]

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.
[1913 Webster]

{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 ureae} and {Micrococcus
ureae}, which are found abundantly in urines undergoing
alkaline fermentation.
[1913 Webster]


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  • Urea | Definition, Formula, Production, Uses, Facts | Britannica
    Urea is the chief nitrogenous end product of the metabolic breakdown of proteins in all mammals and some fishes The material occurs not only in the urine of all mammals but also in their blood, bile, milk, and perspiration
  • What Is Urea Made Of? How Is Urea Produced? - Science ABC
    Urea is the final, non-toxic product of such a metabolic cycle, which can then be eliminated from the body Before we go into the details of why urea is so important, let’s take a look at how and where it is produced
  • What Exactly Is Urea and How Is It Made in the Body?
    Urea is a small, water-soluble molecule that your body produces to safely dispose of nitrogen, the potentially toxic byproduct of breaking down proteins Your liver manufactures it through a cyclical set of chemical reactions known as the urea cycle, and your kidneys then filter it out of the blood and excrete it in urine
  • What is Urea? (with pictures) - AllTheScience
    Urea is a chemical compound found in urine, although it is also made artificially Urea contains nitrogen, which makes it ideal for
  • Urea - Simple English Wikipedia, the free encyclopedia
    It was first found in urine in 1773 by the French chemist Jean Rouelle It is also called Carbamide, and its chemical names are Carbonyl Diamide (used in inorganic chemistry) and Diaminomethanal (used in organic chemistry) In humans, it is a normal component of blood and many body tissues
  • Urea - American Chemical Society
    Urea, also known as carbamide, is a safe, useful compound with a significant history It is a naturally occurring molecule that is produced by protein metabolism and found abundantly in mammalian urine
  • The Biological Roles of Urea: A Review of Preclinical Studies
    Urea is an organic compound that has been reported to be effective against many pathological conditions However, many other studies have reported the toxic effects of urea These controversies on the biological roles of urea remain unresolved
  • Urea | NH2CONH2 | CID 1176 - PubChem
    Urea appears as solid odorless white crystals or pellets Density 1 335 g cc Noncombustible Urea is a carbonyl group with two C-bound amine groups The commercially available fertilizer has an analysis of 46-0-0 (N-P2O5-K2O)





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