Ammonia N 13 | definition of ammonia N 13 by Medical dictionary
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ammonia

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ammonia

 [ah-mo´nyah]
a colorless alkaline gas, NH3, with a pungent odor and acrid taste, and soluble in water.
ammonia N 13 ammonia in which a portion of the molecules are labeled with 13N; used in positron emission tomography of the cardiovascular system, brain, and liver.
Miller-Keane Encyclopedia and Dictionary of Medicine, Nursing, and Allied Health, Seventh Edition. © 2003 by Saunders, an imprint of Elsevier, Inc. All rights reserved.

am·mo·ni·a

(ă-mō'nē-ă),
A colorless volatile gas, NH3, highly soluble in water, capable of forming a weak base, which combines with acids to form ammonium compounds.
[fr. L. sal ammoniacus, salt of Amen (G. Ammōn), obtained near a temple of Amen in Libya]
Farlex Partner Medical Dictionary © Farlex 2012

ammonia

Biochemistry
An irritating, water-soluble, strongly basic, colourless gas, which is lighter than air.
 
Industry
Ammonia (NH3) is used in explosives, fertilisers, refrigerants and household cleaning solutions.
 
Physiology
NH3 is produced in the liver, intestine and kidneys as an end-product of protein metabolism; the liver converts ammonia into urea, which is then excreted by the kidneys; in liver disease this conversion is decreased, resulting in increased serum ammonia. Serial measurement of ammonia is used to follow progression of hepatic encephalopathy in Reye syndrome and other conditions.
 
Ref range
15–49 µg/dL.
 
Abnormal values
Increased hepatic coma, Reye syndrome, severe CHF, GI haemorrhage, erythroblastosis fetalis, drugs (e.g., diuretics and antibiotics).
Segen's Medical Dictionary. © 2012 Farlex, Inc. All rights reserved.

ammonia

NH3 Physiology NH3 is produced in the liver, intestine, and kidneys as endproduct of protein metabolism; the liver converts ammonia into urea, which is then excreted by the kidneys; in liver disease this conversion is diminished, resulting in ↑ serum ammonia; serial measurement of ammonia is used to follow the progression of hepatic encephalopathy in Reye syndrome and other conditions Ref range 15-49 µg/dL Abnormal values ↑ Hepatic coma, Reye syndrome, severe CHF, GI hemorrhage, erythroblastosis fetalis, drugs–eg, diuretics and antibiotics. See Hepatic encephalopathy.
McGraw-Hill Concise Dictionary of Modern Medicine. © 2002 by The McGraw-Hill Companies, Inc.

am·mo·nia

(NH3) (ă-mō'nē-ă)
A colorless volatile gas, NH3, highly soluble in water, capable of forming a weak base, which combines with acids to form ammonium compounds.
[fr. L. sal ammoniacus, salt of Amen (G. Ammōn), obtained near a temple of Amen in Libya]
Medical Dictionary for the Health Professions and Nursing © Farlex 2012

ammonia

A substance produced when AMINO ACIDS are broken down. Ammonia is converted by the liver into urea and excreted in the urine. Urea can be broken down by bacterial enzymes to release ammonia. This may be a cause of nappy rash in babies.
Collins Dictionary of Medicine © Robert M. Youngson 2004, 2005

ammonia

a colourless gas, which is the main form in which nitrogen is utilized in living cells. Formula: NH3.
Collins Dictionary of Biology, 3rd ed. © W. G. Hale, V. A. Saunders, J. P. Margham 2005

am·mo·nia

(ă-mō'nē-ă)
A colorless volatile gas, NH3, highly soluble in water, capable of forming a weak base, which combines with acids to form ammonium compounds.
[fr. L. sal ammoniacus, salt of Amen (G. Ammōn), obtained near a temple of Amen in Libya]
Medical Dictionary for the Dental Professions © Farlex 2012


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