urea nitrogen - definition. What is urea nitrogen
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UREA NITROGEN IN BLOOD
Blood urea nitrogen test; BUN test; Blood Urea Nitrogen; BUN; Blood Urea Nitrogen test; Serum urea; Urea nitrogen; Serum urea nitrogen
  • [[Reference ranges for blood tests]], comparing urea (yellow at right) to other blood constituents

Urea-formaldehyde         
  • A range of objects made from UF
  • Two steps in formation of urea-formaldehyde resin
  • Urea-formaldehyde insulation
INSULATING SUBSTANCE
Urea-Formaldehyde; Urea-formaldehyde resin; Urea-Formaldehyde Resin; Urea-formaldehyde resins; UFFI; Urea-methanal; Urea-formaldehyde insulation; Urea formaldehyde; Urea formaldehyde resin; Ureaform; Urea resin; Methylene urea; Urea-formaldehyde foam insulation
Urea-formaldehyde (UF), also known as urea-methanal, so named for its common synthesis pathway and overall structure,Uses Of Formaldehyde is a nontransparent thermosetting resin or polymer. It is produced from urea and formaldehyde.
Urea cycle         
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CYCLE OF BIOCHEMICAL REACTIONS PRODUCING UREA
Krebs-Henseleit cycle; Urea Cycle; Ornithine cycle; Ornithine-urea cycle; Urea cycle and metabolism of amino groups; Arginine-urea cycle; Onithine cycle; Urea cycle disorder; Urea cycle disorders
The urea cycle (also known as the ornithine cycle) is a cycle of biochemical reactions that produces urea (NH2)2CO from ammonia (NH3). Animals that use this cycle, mainly amphibians and mammals, are called ureotelic.
nitrogen cycle         
  • 50px
  • Estimated nitrogen surplus (the difference between inorganic and organic fertilizer application, atmospheric deposition, fixation and uptake by crops) for the year 2005 across Europe.
  • Nitrogen fertilizer application
  • Nitrogen in manure production
  • 50px]] Material was copied from this source, which is available under a [https://creativecommons.org/licenses/by/4.0/ Creative Commons Attribution 4.0 International License].</ref>
  • '''Marine nitrogen cycle'''}}
  • '''Marine nitrogen cycle under future ocean acidification'''{{hsp}}<ref name="O'Brien2016" />}}
  • COMMAMOX]] is complete ammonium oxidation.
BIOGEOCHEMICAL CYCLE BY WHICH NITROGEN IS CONVERTED INTO VARIOUS CHEMICAL FORMS
Nitrogen Cycle; N cycle; Nitrogen immobilization; Nitrogen metabolism; Nitrogen cycling; Ammonification; User:Ascrimge/Nitrogen flow through the Metabolism; Nitrogen Flow through Metabolism; The nitrogen cycle; Nitrogen Decomposition; Nitrogen-cycle; Marine nitrogen cycle; Ocean nitrogen cycle
¦ noun Ecology the series of processes by which nitrogen and its compounds are interconverted in the environment and in living organisms.

ويكيبيديا

Blood urea nitrogen

Blood urea nitrogen (BUN) is a medical test that measures the amount of urea nitrogen found in blood. The liver produces urea in the urea cycle as a waste product of the digestion of protein. Normal human adult blood should contain 6 to 20 mg/dL (2.1 to 7.1 mmol/L) of urea nitrogen. Individual laboratories will have different reference ranges as the assay used can vary between laboratories. The test is used to detect renal problems. It is not considered as reliable as creatinine or BUN/creatinine ratio blood studies.