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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
  • Urea Test: High Low Levels + Normal Range - SelfHacked
    Urea is an important measure of kidney health, liver health, and protein turnover A urea blood test is often ordered as a part of a comprehensive metabolic panel, which gives a broad overview of a person’s metabolic and overall health How do doctors use this test? Read on to find out What is Urea?
  • What Is Urea Made Of? How Is Urea Produced? - Science ABC
    Urea is a relatively non-toxic organic compound that aids in the breakdown of nitrogen-containing compounds and potentially toxic metabolic byproducts Urea is produced in the liver through the Urea Cycle, which occurs in both the mitochondria and cytoplasm of liver cells
  • Urea | NH2CONH2 | CID 1176 - PubChem
    urea, the diamide of carbonic acid, is most important degradation of protein catabolism in man, in other mammals in certain other animal species urea is formed in liver forms the major part of organics in urine
  • 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
  • Urea (blood and urine) | Pathology Tests Explained
    Urea urine testing Very occasionally, urea is measured in a urine sample This can involve testing all the urine you pass over a 24-hour period, but it can also sometimes be measured as a single test Testing urine for urea is mainly used to check how much protein someone has taken in from their food and to estimate the protein intake in their
  • Urea - Simple English Wikipedia, the free encyclopedia
    Urea is an organic compound 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 )
  • The Urea Cycle - 230nsc1. phy-astr. gsu. edu
    The urea cycle is a cycle of biochemical reactions that produces urea (NH 2) 2 CO from ammonia (NH 3) The urea cycle converts highly toxic ammonia to urea for excretion This cycle was the first metabolic cycle to be discovered (Hans Krebs and Kurt Henseleit, 1932), five years before the discovery by Krebs of the TCA cycle (also known as Krebs cycle and citric acid cycle)





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