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International Journal of Toxicology, 2023
The Expert Panel for Cosmetic Ingredient Safety reviewed updated information that has become available since their original assessment from 1980, along with updated information regarding product types, and frequency and concentrations of use, and reaffirmed their original conclusion that Imidazolidinyl Urea is safe as a cosmetic ingredient in the ...
Christina, Burnett +10 more
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The Expert Panel for Cosmetic Ingredient Safety reviewed updated information that has become available since their original assessment from 1980, along with updated information regarding product types, and frequency and concentrations of use, and reaffirmed their original conclusion that Imidazolidinyl Urea is safe as a cosmetic ingredient in the ...
Christina, Burnett +10 more
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Angewandte Chemie International Edition, 2011
AbstractOver the last decade the use of urea derivatives as useful reagents, catalysts, and structural features in organic chemistry has increased rapidly. They now find utility as hydrogen‐bond donors in organocatalysts and anion transporters, as important scaffolds in supramolecular chemistry, as lithiation directors, amination substrates, and ...
Volz, Nicole, Clayden, Jonathan
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AbstractOver the last decade the use of urea derivatives as useful reagents, catalysts, and structural features in organic chemistry has increased rapidly. They now find utility as hydrogen‐bond donors in organocatalysts and anion transporters, as important scaffolds in supramolecular chemistry, as lithiation directors, amination substrates, and ...
Volz, Nicole, Clayden, Jonathan
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Plasma urea kinetics in urea infusion
Clinical Pharmacology & Therapeutics, 1972Seven patients undergoing an infusion of 30 per cent urea‐10 per cent invert sugar solution (Urevert) for treatment of cerebral edema were studied with regard to plasma urea kinetics. The 2 compartment (extracellular and intracellular fluid spaces) model has been applied to analysis of the plasma levels.
P R, Yarnell +3 more
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2014
Urea is generated by the urea cycle enzymes, which are mainly in the liver but are also ubiquitously expressed at low levels in other tissues. The metabolic process is altered in several conditions such as by diets, hormones, and diseases. Urea is then eliminated through fluids, especially urine.
Hongkai, Wang, Jianhua, Ran, Tao, Jiang
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Urea is generated by the urea cycle enzymes, which are mainly in the liver but are also ubiquitously expressed at low levels in other tissues. The metabolic process is altered in several conditions such as by diets, hormones, and diseases. Urea is then eliminated through fluids, especially urine.
Hongkai, Wang, Jianhua, Ran, Tao, Jiang
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“Urea to Urea” Approach: Access to Unsymmetrical Ureas Bearing Pyridyl Substituents
Advanced Synthesis & Catalysis, 2022AbstractA protocol for the synthesis of unsymmetrical ureas substituted by pyridyl/quinolinyl moiety has been developed. This method concluded in metal‐ and base‐free reamination of N,N‐dimethyl‐N‘‐hetaryl ureas with a wide range of aryl and alkyl amines. The isolated yields vary from 40 to 96% depending on the nucleophilicity of the amines.
Svetlana O. Kasatkina +4 more
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Nature, 1948
CONSIDERABLE evidence1 has been presented for the polar structures I and II as important contributory forms of urea in aqueous solution and in the solid state. This view has been criticized by Bell, Gillespie and Taylor2 on the grounds of electrometric titration data.
J O, HARRIS, A H, ROBSON
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CONSIDERABLE evidence1 has been presented for the polar structures I and II as important contributory forms of urea in aqueous solution and in the solid state. This view has been criticized by Bell, Gillespie and Taylor2 on the grounds of electrometric titration data.
J O, HARRIS, A H, ROBSON
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Characterization and chemistry of imidazolidinyl urea and diazolidinyl urea
Contact Dermatitis, 2006For several decades, the cosmetic preservatives imidazolidinyl urea (IU) and diazolidinyl urea (DU) have not only been poorly characterized but have also had misleading chemical structures assigned to them. The most common trade names of IU and DU are Germall 115 and Germall II, respectively.
Lehmann, Søren Vig +4 more
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Urea Reduction Ratio Considering Urea Rebound
Nephron, 1998An American National Study shows that survival benefits from higher dialysis doses appear to be present up to a Kt/V level of 1.3 or a urea reduction ratio (URR) of 70%. The effect of increasing dialysis efficiency magnified urea rebound and the error in URR determinations.
F, Maduell +8 more
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Digital Urea Meter for Impedeometric Urea Sensor
2019 IEEE International Instrumentation and Measurement Technology Conference (I2MTC), 2019This paper presents, an electronic interface to measure the concentration of urea in aqueous solution. The interface uses a simple, cost effective, two electrode type impedeometric urea sensor already reported by the author. This paper discusses, measurement technique and range changing algorithm.
Asmita Bose, Karabi Biswas
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Seminars in Neurology, 2014
The urea cycle is the primary nitrogen-disposal pathway in humans. It requires the coordinated function of six enzymes and two mitochondrial transporters to catalyze the conversion of a molecule of ammonia, the α-nitrogen of aspartate, and bicarbonate into urea.
Helman, Guy +2 more
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The urea cycle is the primary nitrogen-disposal pathway in humans. It requires the coordinated function of six enzymes and two mitochondrial transporters to catalyze the conversion of a molecule of ammonia, the α-nitrogen of aspartate, and bicarbonate into urea.
Helman, Guy +2 more
openaire +4 more sources