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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, 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
  • Urea | NH2CONH2 | CID 1176 - PubChem
    Urea | NH2CONH2 or CH4N2O | CID 1176 - structure, chemical names, physical and chemical properties, classification, patents, literature, biological activities, safety hazards toxicity information, supplier lists, and more
  • What Is Urea Made Of? How Is Urea Produced? - Science ABC
    Urea is a non-toxic, water-soluble compound (CO (NH2)2) produced in the liver via the Urea Cycle, where the body converts toxic ammonia into a safe waste form
  • 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 - 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 - NIST Chemistry WebBook
    NIST subscription sites provide data under the NIST Standard Reference Data Program, but require an annual fee to access The purpose of the fee is to recover costs associated with the development of data collections included in such sites Your institution may already be a subscriber
  • Urea Manufacturing Process Explained | How Urea Is Made in Industries
    Urea—also called carbamide —is a white, solid compound that’s rich in nitrogen, a key nutrient for plants It dissolves easily in water, doesn’t leave behind salty residues, and is often shaped into tiny round pellets or granules for easier use
  • Understanding Normal Urea Levels and High Urea Symptoms
    Urea is a byproduct of the liver’s conversion of ammonia (produced during protein breakdown) into a less toxic, more readily eliminated compound It travels through the bloodstream to the kidneys, where it is excreted in urine Maintaining normal urea levels is crucial for metabolic balance
  • 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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