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Now showing items 51-60 of 96
Mechanism of Dehydration of Ethanol over Alumina
(
Qatar University
, 1981 , Article)
The dehydration reaction of ethanol to ether and ethylene was kinetically investigated in a flow system using •y-alumina. Pyridine was found to inhibit the formation of ethylene and ether. The rate of ethylene formation ...
Gc-ms analysis and antimicrobial activity of volatile oil of Pituranthos tortuosus (desf.)
(
Qatar University
, 1995 , Article)
Volatile oil of Pituranthos tortuosus (Desf.), family Umbelliferae was prepared in yield of (0.5%). GC-MS analysis of the oil resulted in identification of eight components. Dill apiole was the main constituent (94.76%). ...
Synthesis and Spectroscopic Studies ofAtenolol Derivatives with Enhanced Lipophilicity as Potential Prodrugs
(
Qatar University
, 2002 , Article)
Atenolol, a selective pi-adrenoceptor blocking agent is characterized by its low bioavailability. A number of atenolol prodrugs were synthesized to improve its lipid solubility and hence bioavailability. These compounds ...
A New Liquid Membrane Electrode For Selective Determination Of Caffeine
(
Qatar University
, 1984 , Article)
A new liquid membrane electrode for caffeine prepared from a solution of caffeine-picrylsulfonate ion-pair complex in n-octanol is developed. It exhibits Nernstian response in the range of 10'2 to lO^M caffeine with a ...
Corrosion of n-GaAs/aqueous Photoelectrochemical Cell
(
Qatar University
, 2005 , Article)
A combination of electrochemical studies, scanning electron microscopy, SEM, and light reflectivity measurements reveals information about the corrosion of enlightened n-GaAs in various aqueous electrolytes. The corrosion ...
Facile synthesis of several new pyridine and fused pyridine derivatives with Anticipated biological activity
(
Qatar University
, 1994 , Article)
The reactions of benzothiazol-2-N-acetylacetohydrazide 1 with a, (}-unsaturated aldehyde, ketone, ester or diketoester led to the formation of the titled ring systems. The same target was also achieved through the reactions ...
Analytical Studies Of Some Controlled And Noncontrolled Drugs Of Abuse
(
Qatar University
, 1991 , Article)
Separation and identification of some depressants and stimulants by GLC, combined GC-MS and HPLC techniques was attempted. The results obtained are successful, valuable and may be applied in routine forensic analysis.
Methylated Flavonoids From Artemisia Monosperma
(
Qatar University
, 1989 , Article)
Investigation of the flavonoid constituents of Artemisia monosperma resulted in the isolation and identification of four methylated flavonoids: quercetin 3,3',4'-trimethylether, diosmetin (luteolin 4'-methylether), ...
Photocatalytic treatment of industrial wastewater
(
Qatar University
, 1997 , Article)
A novel Plexiglas double-skin sheet reactor ( DSSR ) able to use diffuse as well as direct sunlight for the detoxification of industrial wastewater was used. The efficiency of the photocatalytic treatment of a highly ...
Vibrational Analysis Of TaBr5
(
Qatar University
, 1987 , Article)
Vibrational analysis for TaBr5 is achieved on the basis of D3h symmetry and employing GF matrix method. Each vibration is quantitatively assigned according to the calculated values of the potential energy distributions. ...