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Table representation of search results timeline featuring number of search results per year.

Year Number of Results
1945 27
1946 108
1947 135
1948 182
1949 186
1950 127
1951 139
1952 107
1953 111
1954 120
1955 112
1956 193
1957 341
1958 333
1959 389
1960 314
1961 352
1962 439
1963 730
1964 1099
1965 697
1966 444
1967 472
1968 507
1969 515
1970 528
1971 666
1972 720
1973 723
1974 783
1975 750
1976 764
1977 793
1978 711
1979 749
1980 712
1981 651
1982 710
1983 644
1984 679
1985 618
1986 693
1987 655
1988 681
1989 650
1990 665
1991 704
1992 711
1993 704
1994 694
1995 761
1996 709
1997 723
1998 752
1999 710
2000 788
2001 837
2002 870
2003 864
2004 977
2005 980
2006 971
2007 1021
2008 1034
2009 1044
2010 1158
2011 1194
2012 1441
2013 1629
2014 1690
2015 1680
2016 1543
2017 1594
2018 1527
2019 722
2020 20
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50,072 results
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Page 1
Anion recognition by oligo-(thio)urea-based receptors.
Jia C, et al. Chem Commun (Camb) 2016 - Review. PMID 27352298
Typical examples of metal-coordination assisted and covalently connected oligo-(thio)urea receptors are summarized, with focus on geometry characteristics required for achieving complementary binding of a target anion. ...
Typical examples of metal-coordination assisted and covalently connected oligo-(thio)urea receptors are summarized, with focus on geo …
Novel Trifluoromethylcoumarinyl Urea Derivatives: Synthesis, Characterization, Fluorescence, and Bioactivity.
Qiao L and Hao S. Molecules 2018. PMID 29518951 Free PMC article.
A series of novel trifluoromethylcoumarinyl urea derivatives were designed, synthesized, and characterized by ¹H-NMR, (13)C-NMR, and HR-ESI-MS. ...
A series of novel trifluoromethylcoumarinyl urea derivatives were designed, synthesized, and characterized by ¹H-NMR, (13)C-NMR, and …
Towards optoelectronic urea biosensors.
Pokrzywnicka M, et al. Anal Bioanal Chem 2015. PMID 25619983 Free PMC article.
Both enzyme-based biodevices, operating according to the paired emitter detector diode (PEDD) principle, allow relatively fast, highly sensitive, and well-reproducible urea detection in the millimolar range of concentrations. Potential analytical applications of the developed urea bioPEDDs have been announced. Both presented constructions will be easily adapted for the development of other optoelectronic biosensors exploring various enzyme-based schemes of biodetection....
Both enzyme-based biodevices, operating according to the paired emitter detector diode (PEDD) principle, allow relatively fast, highly sensi …
Urea Hydrolysis Rate in Soil Toposequences as Influenced by pH, Carbon, Nitrogen, and Soluble Metals.
Fisher KA, et al. J Environ Qual 2016. PMID 26828191
A simultaneous increase in the use of urea fertilizer and the incidence of harmful algal blooms worldwide has generated interest in potential loss pathways of urea from agricultural areas. The objective of this research was to study the rate of urea hydrolysis in soil profile toposequences sampled from the Coastal Plain (CP) and Piedmont (PM) regions of Maryland to understand native urea hydrolysis rates (UHRs) as well as the controls governing urea hydrolysis both across a landscape and with depth in the soil profile. ...
A simultaneous increase in the use of urea fertilizer and the incidence of harmful algal blooms worldwide has generated interest in p …
Xenobiotic-urea conjugates; chemical or biological?
Mitchell SC. Xenobiotica 2014 - Review. PMID 25144804
Conjugation with urea, an abundant, non-toxic, small water soluble molecule, is such a disputed and debatable Phase II pathway. 3. The present article collates data gleaned from the literature concerning xenobiotic-urea conjugation, presents pertinent information resurrecting the controversy and poses questions as to the nature of the phenomenon....
Conjugation with urea, an abundant, non-toxic, small water soluble molecule, is such a disputed and debatable Phase II pathway. 3. Th …
Determination of urea content in urea cream by centrifugal partition chromatography.
Wang YQ, et al. J Food Drug Anal 2016. PMID 28911595 Free article.
The objective of this study is to establish a centrifugal partition chromatography (CPC) method for determination of the urea ingredient in urea cream. The mechanism of this method is that urea is determined by UV detector at 430 nm after being extracted from the cream and derivatized on line via Ehrlich reaction in rotor of CPC, where the reaction products dissolve in the mobile phase and the cream matrix retains in the stationary phase. ...
The objective of this study is to establish a centrifugal partition chromatography (CPC) method for determination of the urea ingredi …
Thermodynamics and reaction mechanism of urea decomposition.
Tischer S, et al. Phys Chem Chem Phys 2019. PMID 31328193
The selective catalytic reduction technique for automotive applications depends on ammonia production from a urea-water solution via thermolysis and hydrolysis. ...The observed phenomenon of liquefaction and re-solidification of biuret in the temperature range of 193-230 °C is explained by formation of a eutectic mixture with urea....
The selective catalytic reduction technique for automotive applications depends on ammonia production from a urea-water solution via …
Synthesis and characterization of chitosan alkyl urea.
Wang J, et al. Carbohydr Polym 2016. PMID 27106154
Chitosan alkyl urea is a kind of intermediate used to prepare enantioseparation materials. In order to synthesize the intermediates, in the present work, a new way to prepare chitosan alkyl urea has been established: chitosan was first reacted with methyl chloroformate yielding N-methoxyformylated chitosan, which was then converted to chitosan alkyl urea through amine-ester exchange reaction. ...The as-prepared chitosan alkyl urea derivatives were characterized by IR, (1)H NMR, (13)C NMR,(1)H-(1)H COSY and (1)H-(13)C HSQC NMR spectra. ...
Chitosan alkyl urea is a kind of intermediate used to prepare enantioseparation materials. In order to synthesize the intermediates, …
Oligo-Urea with No Alkylene Unit Self-Assembles into Rod-Like Objects in Water.
Han S, et al. Macromol Rapid Commun 2019. PMID 30417532
A simple access to well-defined rod-like assemblies in water is reported based on a penta-urea sticker directly connected to poly(ethylene oxide) side chains. ...
A simple access to well-defined rod-like assemblies in water is reported based on a penta-urea sticker directly connected to poly(eth …
The history of urea as a hyperosmolar agent to decrease brain swelling.
Otvos B, et al. Neurosurg Focus 2014. PMID 24684336
Urea was first used as an osmotic agent for the reduction of brain volume in 1950. It was associated with greater efficacy and consistency than alternatives such as hyperosmolar glucose. ...However, the prime of urea was rather short lived. Reports of side effects and complications associated with urea emerged. These included coagulopathy, hemoglobinuria, electrocardiography changes, tissue necrosis with extravasation, and a significant potential for rebound intracranial hypertension. ...
Urea was first used as an osmotic agent for the reduction of brain volume in 1950. It was associated with greater efficacy and consis
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