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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 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
  • How to Make Urea Fertilizer: The Industrial Reality
    Urea fertilizer is made by reacting ammonia with carbon dioxide under high pressure and temperature in an industrial process It cannot be safely or practically produced at home The reaction requires specialized equipment operating at extreme conditions, and the key raw material, anhydrous ammonia, is lethally toxic at relatively low concentrations What follows is a clear breakdown of how
  • Urea | 57-13-6 - ChemicalBook
    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 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
  • Why Blood Urea Levels Rise (Uremia): Key Medical Causes
    High blood urea levels may signal kidney problems Explore the key medical causes of uremia, its symptoms, diagnostic tests, and treatment approaches for better kidney health
  • Urea ACS reagent, 99. 0-100. 5 57-13-6 - MilliporeSigma
    Urea is used in manufacturing chemical compounds It is widely used in the agricultural industry as a fertilizer as well as an animal feed additive, which is used as a nitrogen supplement in animal husbandry
  • Uremia: Causes, Symptoms, Diagnosis Treatment
    A BUN test is a type of blood test that measures how much of the waste product urea nitrogen is in your blood The BUN can be very high in uremia (which is where the name uremia comes from)
  • What Is Urea? Dermatologists Explain the Skincare Ingredient - Best Life
    Urea is an organic compound that touts impressive skin health benefits, particularly when it comes to hydration and elasticity It’s often used as a main ingredient in moisturizing serums, gels, creams, and body lotions





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