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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 - Wikipedia
    Urea serves an important role in the cellular metabolism of nitrogen -containing compounds by animals and is the main nitrogen-containing substance in the urine of mammals Urea is Neo-Latin, from French urée, from Ancient Greek οὖρον (oûron) 'urine', itself from Proto-Indo-European *h₂worsom
  • Urea | Definition, Formula, Production, Uses, Facts | Britannica
    Urea, the diamide of carbonic acid It has important uses as a fertilizer and feed supplement, as well as a starting material for the manufacture of plastics and drugs
  • 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
  • What is Urea? – Its Production, Uses and Geopolitics
    Urea is a simple amide that consists of two amino groups (-NH₂) joined by a carbonyl group (C=O) It is produced naturally in the body through the urea cycle as a way to eliminate excess nitrogen from protein metabolism
  • 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
  • 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
  • What is Urea? Chemical Properties, Uses, Production Importance in . . .
    Discover everything you need to know about Urea (Carbamide): its chemical formula, structure, production methods, key properties, and wide range of uses in fertilizers, skincare, agriculture, and explosives Learn how urea plays a vital role in plant nutrition, animal feed, and more
  • What is Urea? - BOC Sciences
    Urea is a colorless, crystalline solid that exhibits a transparent appearance at room temperature It is a binary organic compound with two amino groups and one carbonyl group, hence serving as a representative of a binary amide
  • Urea | Encyclopedia. com
    Urea (yoo-REE-uh) is a white crystalline solid or powder with almost no odor and a salty taste It is a product of the decomposition of proteins in the bodies of terrestrial animals Urea is produced in the liver and transferred to the kidneys, from which it is excreted in urine
  • Urea (CH₄N₂O) – Definition, Structure, Preparation, Properties, Uses . . .
    Urea is a fascinating molecular compound that plays a crucial role in both nature and various industries As a fundamental concept in chemistry, urea is known for being the main nitrogen-containing substance in the urine of mammals





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