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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 is widely used in fertilizers as a source of nitrogen (N) In 1828, Friedrich Wöhler discovered that urea can be produced from inorganic starting materials, 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 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
  • What Is Urea Fertilizer ? A Comprehensive Guide - GardenerBible
    Urea fertilizer contains approximately 46% nitrogen, making it a popular choice among farmers due to its high concentration of the essential nutrient The nitrogen in urea fertilizer is readily available to plants, promoting healthy growth and development
  • What Exactly Is Urea and How Is It Made in the Body?
    Urea, also known chemically as carbamide, is a simple organic compound central to human biology as the body’s primary method for safely eliminating excess nitrogen This colorless, odorless, and highly water-soluble compound is the major nitrogen-containing substance found in the urine of mammals
  • 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
  • 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)
  • Blood Urea Nitrogen (BUN) Test: High vs. Low Levels, Normal Range - WebMD
    The BUN blood test measures the amount of urea nitrogen in your blood If your levels are outside the normal range, this might mean either your liver or kidneys are not working well
  • 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
  • What Does Urea Do in Your Body and Skin? - Biology Insights
    Each molecule of urea contains two nitrogen atoms, one from ammonia and one from an amino acid called aspartate This makes urea an efficient vehicle for removing nitrogen waste: it’s water-soluble, far less toxic than ammonia, and easy for the kidneys to filter out





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