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urea    音標拼音: [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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英文字典中文字典相關資料:
  • Urea - Wikipedia
    Urea is widely used in fertilizers as a source of nitrogen (N) and is an important raw material for the chemical industry In 1828, Friedrich Wöhler discovered that urea can be produced from inorganic starting materials, which was an important conceptual milestone in chemistry
  • 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 It is a colorless, crystalline substance that melts at 132 7 degrees C (271 degrees F) and decomposes before boiling
  • 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 - 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- Definition, Preparation, Properties and Uses - Science Info
    Urea is the nitrogenous byproduct of protein breakdown in mammals and some fishes Urea is also called carbamide It is a type of fertilizer
  • 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? (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 - 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 - New World Encyclopedia
    The individual atoms that make up a urea molecule come from carbon dioxide, water, aspartate and ammonia in a metabolic pathway known as the urea cycle, an anabolic process This expenditure of energy is necessary because ammonia, a common metabolic waste product, is toxic and must be neutralized





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