Results 121 to 130 of about 337,656 (329)

Comparison of immunochromatography, thin layer chromatography and gas chromatography techniques for drug detection in urine

مجله علمی دانشگاه علوم پزشکی کردستان, 2021
Background and Aim: Nowadays, drug abuse is a major problem in societies, and detection of drugs in urine is very important.  In general, immunochromatography (ICG) and thin-layer chromatography (TLC) are routine methods for the detection of drugs in ...
Mohammad Ahmadia khosroshahi, Parvin Gharbani   +1 more
doaj  

A Michaelis‐Arbuzov‐Type Pathway to a Protected 2ʹ‐Deoxy‐2ʹ‐Selenomethyl‐Adenosine‐3ʹ,5ʹ‐Phosphoroselenolate Guanosine Dinucleotide for Use in Modified m7G Cap Synthesis

Chemistry – A European Journal, EarlyView.
Here we report a synthesis of the dinucleotide 4 for a projected future total synthesis of the m7G cap 1. Highlights of the route include: 1) a 3ʹ‐H‐phosphonate/5ʹ‐selenocyanate Michaelis‐Arbuzov coupling to forge the 3ʹ,5ʹ‐phosphoroselenolate; 2) an Amosova reductive selenomethylation to install the 2ʹ‐SeMe; 3) a solid CPR II 5ʹ‐O‐phosphitylation; and
K. Lawrence E. Hale, Helen O. McCarthy, Mark G. McLaughlin   +2 more
wiley   +1 more source

Fundamentos teóricos para la enseñanza de competencias manuales en tecnologías en Salud. El caso de los técnicos de histología

Alternancia
Distintas especializaciones tecnológicas en salud son operario dependiente que trabajan bajo estrés en la optimización del resultado final, por lo que la formación necesita incluir además de las destrezas otros conocimientos que reduzca la incertidumbre ...
Rosa Alicia Araoz
doaj   +1 more source

Methyl on the Bridge: 2‐Methyl Propellane as Precursor for 1,3‐Substituted 2‐Methylated Bicyclo[1.1.1]Pentanes

Chemistry – A European Journal, EarlyView.
The synthesis of 2‐methyl propellane and its conversion to various 1,2‐ and 1,2,3‐di‐ and trisubstituted bicyclopentanes is reported. Abstract Bicyclo[1.1.1]pentanes (BCPs) have emerged as isosteric replacements for mono‐ and para‐substituted benzene rings in medicinal and materials applications, involving substitution at the BCP bridgehead (1,3 ...
Sean R. Verschaeve, Mariana Gomes Manso, Tibo Van Eeckhoorn, Mark E. Light, Bruno Linclau   +4 more
wiley   +1 more source

Twisted 1‐ and 2‐Azaperopyrenes: Synthesis, Structure, and Properties

Chemistry – A European Journal, EarlyView.
ABSTRACT A synthesis of hitherto unknown 1‐ and 2‐azaperopyrenes, twisted nitrogen‐doped peropyrenes, is reported. The synthesis is based on a Brønsted acid‐mediated benzannulation of alkynes. Key alkyne intermediates are synthesized via two complementary routes, including a Pd/C‐catalyzed, copper‐ and amine‐free Sonogashira‐type coupling of (hetero ...
Ricardo Molenda, Arpine Vardanyan, Alexander Villinger, Peter Ehlers, Peter Langer   +4 more
wiley   +1 more source

ASSESSMENT OF VARIOUS DIAGNOSTIC PARAMETERS IN CASES OF ACUTE APPENDICITIS [PDF]

Perspectives In Medical Research, 2019
Introduction:Acute appendicitis is a common surgical emergency and appendectomy is one of the frequently done emergency surgical operations. Its diagnosis stills remain elusive due to its varying presentation.
Dr. AbbadiVenkat Mohan Reddy, Dr.MohdInayatulla Khan
doaj  

Rh‐Catalyzed [2 + 2 + 2] Cycloaddition of Linked Bis(Diynes) Ar‐C≡C‐C≡C‐(CH2)3‐C≡C‐C≡C‐Ar With Quinones: Synthesis and Photophysical Properties of Bis(Arylethynyl)‐Naphthoquinones and Anthraquinones

Chemistry – A European Journal, EarlyView.
We report the synthesis bis(arylethynyl)naphtho‐ and anthraquinones via Rh(I)‐catalyzed [2 + 2 + 2] cycloaddition reactions. The substrate scope of both quinones and linked bis‐diynes was explored. Microwave irradiation remarkably enhanced yields.
Luana A. Machado, Jianhua Han, Fábio G. Delolo, Joyce C. Oliveira, Breno U. Abreu, Hállen D. R. Calado, Joannes Krebs, Leibo Tan, Qing Ye, Tobias Groß, Christoph Lambert, Camille Latouche, Abdou Boucekkine, Jean‐François Halet, Holger Braunschweig, Todd B. Marder, Eufrânio N. da Silva Júnior   +16 more
wiley   +1 more source

Highly Potent Fluorogenic Ligands for Triplex DNA: 5‐Substituted 2‐(Naphthalen‐2‐yl)‐4H‐Chromen‐4‐Ones

Chemistry – A European Journal, EarlyView.
5‐Substituted 2‐(naphthalen‐2‐yl)‐4H‐chromen‐4‐ones are reported as a novel class of highly potent and selective triplex DNA ligands. These ligands induce triplex formation at submicromolar concentrations and inhibit enzymatic activity via ligand‐mediated triplex formation.
Nghia Tran, Landy Gu, Krege M. Christison, Kalee Thao, Liang Xue   +4 more
wiley   +1 more source

An Expressive Extension of TLC

BRICS Report Series, 1999
A temporal logic of causality (TLC) was introduced by Alur, Penczek<br />and Peled in [1]. It is basically a linear time temporal logic<br />interpreted over Mazurkiewicz traces which allows quantification over<br />causal chains. Through this device one can directly formulate causality<br />properties of distributed systems. In
openaire   +3 more sources

The effect of ethanol on cortisol metabolism in man : a thesis presented in partial fulfilment of the requirements for the degree of Master of Science in Biochemistry at Massey University. [PDF]

, 1979
Methods were developed for the estimation of human plasma cortisol by radioimmunoassay and urinary 6β-hydroxycortisol (6βOHF) by colorimetry after separation by thin layer chromatography (TLC).
Evans, Pandora Carlyon
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