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Topic: Urea

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  What is a Urea Cycle Disorder?
A urea cycle disorder is a genetic disorder caused by a deficiency of one of the enzymes in the urea cycle which is responsible for removing ammonia from the blood stream.
In urea cycle disorders, the nitrogen accumulates in the form of ammonia, a highly toxic substance, and is not removed from the body resulting in hyperammonemia.
Because many cases of urea cycle disorders remain undiagnosed and/or infants born with the disorders die without a definitive diagnosis, the exact incidence of these cases is unknown and underestimated.
www.nucdf.org /ucd.htm   (292 words)

  Brainboost - how is urea formed   (Site not responding. Last check: )
Urea : Urea is formed by reacting ammonia with carbon dioxide (CO2) at high pressure..
Urea is formed by the liver in the process of ridding the body of ammonia which is built up as protein you eat is broken down.
Urea is formed by reactions in the liver that unite two ammonia molecules with carbon dioxide..
www.brainboost.com /search.asp?Q=how+is+urea+formed&lfmq=1   (198 words)

 Nikon MicroscopyU Movie Gallery: Urea
Commercially, urea is used as a fertilizer and feed supplement and is a base material for the manufacture of plastics and drugs.
Urea functions as a stabilizer in nitrocellulose explosives and is a constituent of synthetically prepared resins.
Urea occurs not only in the urine of all mammals but also in their blood, bile, milk, and perspiration.
www.microscopyu.com /moviegallery/chemicalcrystals/urea/index.html   (214 words)

 Spartanburg SC | GoUpstate.com | Spartanburg Herald-Journal   (Site not responding. Last check: )
The urea is formed in the livers of mammals in a cyclic pathway, from the break down of ammonia, (a metabolic waste), which was initially named the Krebs-Henseleit cycle after its discoverers, and later became known simply as the urea cycle.
Urea is dissolved in blood (in humans in a concentration of 2.5 - 7.5 mmol/liter) and excreted by the kidney in the urine.
Ureas are closely related to biurets and structurally related to amides, carbamates, diimides, carbodiimides and thiocarbamides.
www.goupstate.com /apps/pbcs.dll/section?category=NEWS&template=wiki&text=urea   (1462 words)

 Fertilizer Urea
Urea, a white crystalline solid containing 46% nitrogen, is widely used in the agricultural industry as an animal feed additive and fertilizer Here we discuss it only as a nitrogen fertilizer.
Urea breakdown begins as soon as it is applied to the soil.
Urea fertilizer can be coated with certain materials, such as sulfur, to reduce the rate at which the nitrogen becomes available to plants.
www.extension.umn.edu /distribution/cropsystems/DC0636.html   (2173 words)

In 1870 urea was produced by heating ammonium carbamate in a sealed vessel.
Urea is produced commercially by the dehydration of ammonium carbamate (NH at elevated temperature and pressure.
Urea is also used in the production of various acylureas and urethanes for use as sedatives and hypnotics.
www.3rd1000.com /urea/urea.htm   (471 words)

 urea. The Columbia Encyclopedia, Sixth Edition. 2001-05
Urea was the first animal metabolite to be isolated in crystalline form; its crystallization was described in the early 18th cent., and in 1773 it was noted that urea gave off ammonia when heated.
In 1828 urea also became the first organic compound to be synthesized from inorganic materials (lead or silver cyanate and ammonia); this work was done by German chemist Friedrich Wöhler in 1828.
Urea is transported in the blood to the kidneys, where it is filtered out; its concentration in urine is about 60 to 70 times as great as that in blood.
www.bartleby.com /65/ur/urea.html   (349 words)

 What is Urea?
Urea, also called carbamide, is an organic chemical compound which essentially is the waste produced when the body metabolizes protein.
Urea was the first natural compound to be synthesized artificially using inorganic compounds— a scientific breakthrough.
Urea is also used commercially and industrially to produce some types of plastics, animal feed, glues, toilet bowl cleaners, dish washing machine detergents, hair coloring products, pesticides, and fungicides.
www.wisegeek.com /what-is-urea.htm   (577 words)

 Definition of Urea cycle
The Urea Cycle is a cycle of biochemical reactions occurring in many animal organisms that produces urea from ammonia.
Urea is much less toxic than ammonia, therefore organisms which can't easily and quickly remove ammonia usually have to convert it to some other substance, like urea or uric acid.
Insufficiency of the urea cycle occurs in some genetic disorders (inborn errors of metabolism), and in liver failure.
www.wordiq.com /definition/Urea_cycle   (234 words)

 Agrium - Urea
Urea is used in the production of fiberglass insulation, forestry fertilization and on airport runways as a de-icer.
Urea is used in the control of NOX emissions.
Urea is produced through the reaction of ammonia (NH)and carbon dioxide (CO The two are reacted together at high pressure at temperatures between 132° and 182° C (270° and 360° F).
www.agrium.com /products_services/ingredients_for_growth/nitrogen/urea.jsp   (211 words)

 What is urea for, in dyeing? Is it necessary?
Urea is used with sodium alginate thickener when printing, painting or directly applying to fiber or is added to Procion dye for super intense color.
Urea has two purposes: it can make it possible to dissolve more dye in a given volume, for the strongest of colors, and it serves as a humectant, or water-attractor, to help keep fabric damp long enough for the reaction to occur.
Urea is the same chemical as is found in the urine of mammals, but the urea we buy is not obtained from urine.
www.pburch.net /dyeing/FAQ/urea.shtml   (581 words)

Urea is used as a fertilizer because of its high nitrogen content and its ability to readily convert to ammonia in the soil.
Urea is used as a significant part of livestock food to meet protein requirements.
Urea is not listed as a Hazardous Material by the Department Of Transportation (DOT), Transport Canada (TC), International Maritime Organization (IMO) and the United Nations (UN).
www.ammoniapro.com /Urea.htm   (551 words)

 The Daily Star Web Edition Vol. 5 Num 927
Facing crisis of urea fertiliser at the peak season for Boro cultivation, the farmers brought out processions and created blockade on the highways at different places, especially in the northern region.
Failing to buy the required urea for about fifteen days, which was high time to apply the fertiliser in their potato fields, the farmers of the district have become frustrated.
The BCIC dealers asked the district administration to release urea from the buffer stock from November but their request was not complied with, said a dealer seeking anonymity.
www.thedailystar.net /2007/01/07/d7010701159.htm   (1033 words)

 BD - Diagnostic Systems: Urea Agar Slants, complete (Christensen)
Urea Agar is used for the differentiation of organisms, especially the Enterobacteriaceae, on the basis of urease production.
Urea Agar was devised by Christensen for use as a solid medium for the differentiation of enteric bacilli.
The base is also supplied as a filter-sterilized 10X concentrated solution in tubes for use in preparing Urea Agar slants in the user's laboratory.
www.bd.com /ds/productCenter/221097.asp   (466 words)

 urea - Definitions from Dictionary.com
Urea is also made artificially for use in fertilizers and medicine.
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.
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.
dictionary.reference.com /browse/urea   (559 words)

 Definition of urea - NCI Dictionary of Cancer Terms
The kidneys filter urea out of the blood and into the urine.
Urea can also be made in the laboratory.
A topical form of urea is being studied in the treatment of hand-foot syndrome (pain, swelling, numbness, tingling, or redness of the hands or feet that may occur as a side effect of certain anticancer drugs).
www.cancer.gov /Templates/db_alpha.aspx?CdrID=471785   (111 words)

 Process for the manufacturing a cured expanded non-cracking dimensionally stable urea formaldehyde product - Patent ...
The process is equally applicable to urea formaldehyde resins produced by methods of drying other than spray-drying, provided that the drying conditions are such that up to about 8% volatiles remain in the dried uncured resin.
The urea formaldehyde resin powder may be partially replaced by other uncured thermosetting synthetic resin powders, for example melamine formaldehyde resin powder and phenol formaldehyde resin powder.
Preferably, a mixture of powders is used, comprising a major proportion of urea formaldehyde resin powder (for example about 70% to 95% by weight) and a minor proportion (for example 5% to 30% by weight) of MF and/or PF resin powders.
www.freepatentsonline.com /4035456.html   (2059 words)

 Solid oral preparations of urea hydrogen peroxide without glycerol - Patent 4302441
Liquids or gels with urea hydrogen peroxide (UHP) in general hitherto have been shown to be beneficial in treating inflammatory oral disease, such as chronic gingivitis by Pomerance, A. S., Tanchester, D.: JADA 66: 67, 1963; Rundegren, J. Fornell, J., Ericson, T.: Scand.
Urea hydrogen peroxide, CO(NH.sub.2).sub.2 H.sub.2 O.sub.2, is a white crystalline powder which is slowly decomposed by the humidity in the air into urea, oxygen and water.
However, when the volunteers sucked on one or two 0.2 g tablets containing urea hydrogen peroxide as given in the examples 2 through 4 the pH of interdental plaque was raised to levels generally acknowledged in the field to be safe for teeth.
www.freepatentsonline.com /4302441.html   (2756 words)

 Urea. DermNet NZ   (Site not responding. Last check: )
Urea preparations are emollients that are essential in the management of dry skin conditions.
Urea 40% aqueous solution can be made up by a pharmacist and has been used for the treatment of fl hairy tongues, acne conglobata, and to dissolve and remove diseased nails.
Urea preparations may be used in children from 1 year and upwards if there is a diagnosed dry skin condition and it has been recommended by the doctor
www.dermnetnz.org /treatments/urea.html   (497 words)

 Spartanburg SC | GoUpstate.com | Spartanburg Herald-Journal   (Site not responding. Last check: )
Urine was used for dyes such as indigo where the urea in the urine reacted with the insoluble dye to form a soluble solution.
In land animals, ammonia is converted into urea by the urea cycle, which is eliminated via the urine.
As urea, the compound which accounts for 75-90% of the nitrogen in urine begins to decay, however, hydroxide ions form, raising the pH as high as 9-9.3.
www.goupstate.com /apps/pbcs.dll/section?category=NEWS&template=wiki&text=Urine   (716 words)

 Urea breath test - RecipeFacts   (Site not responding. Last check: )
The urea breath test is a rapid diagnostic procedure used to identify infections by Helicobacter pylori, a spiral bacterium implicated in gastritis, gastric ulcer, and peptic ulcer disease.
In the subsequent 10-30 minutes, the detection of isotope-labelled carbon dioxide in exhaled breath indicates that the urea was split; this indicates that urease (the enzyme that H.
For the two different forms of urea, different instrumentation is required; carbon-14 is normally measured by scintilation, carbon-13 by isotope ratio mass spectrometry (IRMS).
www.recipeland.com /facts/Urea_breath_test   (325 words)

 eMedicine - Argininosuccinate Lyase Deficiency : Article by Karl S Roth, MD   (Site not responding. Last check: )
Pathophysiology: The hepatic urea cycle is the major route for waste nitrogen disposal; generation of nitrogen is chiefly from protein and amino acid metabolism.
Urea cycle defects with resulting hyperammonemia are due to deficiencies of the enzymes involved in waste nitrogen metabolism.
As in all other urea cycle disorders, clinical suspicion is essential to obtaining a blood ammonia level, which is elevated significantly in the symptomatic patient.
www.emedicine.com /ped/topic2745.htm   (2057 words)

 Hereditary urea cycle abnormality
The urea cycle is a metabolic process in which waste (nitrogen) from the breakdown of dietary proteins is incorporated by the liver into a form (called urea) that can be excreted from the body in the urine.
Abnormality of the urea cycle - hereditary; Urea cycle - hereditary abnormality
All are genetic diseases associated with lack of a protein/enzyme activity in the urea cycle.
www.healthscout.com /ency/1/000372.html   (365 words)

 Search: Urea Fertilizer US
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