Search
Now showing items 1-10 of 77
Heterocyclic Aminoacrylate Esters Of Potential Biological Activity
(
Qatar University
, 1985 , Article)
This work describes the synthesis of N-substituted piperidyl 2-benzoxazole acrylates (la-d); 2-benzothiazole acrylates (2a-d); 2-furyl acrylates (3a-d) and 2-thiophene acrylates (4a-d). The esters of 3-quinuclidyl (Ie, 2e, ...
Synthesis and reactivity of 2-chloro-4-phenyl-6-p-tolyl-nicotinonitrile Towards some nucleophiles
(
Qatar University
, 1986 , Article)
The synthesis and reaction of 2-Chloro-4-phenyl-6-p-tolyl- nicotinonitrile (I) with hydrazine hydrate, sodium azide and urea to give the corresponding hydrazino tetrazolopyridine and urea derivatives respectively, are ...
Constituents Of Centaurea Species
(
Qatar University
, 1992 , Article)
A comprehensive review of Centaurea species including all the isolated consituents is given. The biological activities of the studied species are also reported.
Conductance Measurements in Corrosion Studies of Aluminium
(
Qatar University
, 1994 , Article)
A new method is suggested for studying the rates of dissolution of oxide film on aluminium and its alloys. The method is based on measuring the conductance between two aluminium (or its alloys) electrodes immersed in 3.0 ...
Constituents of plants growing in qatar x.* seasonal variations of the volatile oil of cymbopogon parkeri
(
Qatar University
, 1985 , Article)
The seasonal variation of the volatile oil of Cymbopogon parkeri Stapf. was studied. The oil content is higher during the hot dry season than during the humid hot season and the cold season. No qualitative differences among ...
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), ...
Red cell superoxide dismutase in patients with different liver diseases
(
Qatar University
, 1995 , Article)
Supcroxidc dismutase (SODs, supcroxidc oxidoreductasc, E.C. 1.15.1.1.) activity has been estimated in red blood cells from patients suffering from liver cirrhosis and hcpatoccllular carcinoma. Erythrocytcs supcroxide ...
The Complexation of Lanthanides by Azo-B-Diketones Stability Constants
(
Qatar University
, 1982 , Article)
The stability constants of the complexes between the trivalent lanthanide series of cations and series of azo-B-diketone ligands are reported. The measurements were conducted at 30°C and zero ionic strength (free KN03), ...
Phytochemical Studies On The Marine Algae Of Qatar, Arabian Gulf
(
Qatar University
, 1990 , Article)
The most dominant twenty three algal species representing the main three groups of benthic macroalgae, Chlorophyceae, Phaeophyceae and Rhodophyceae were collected from the coastal zones of the Qatar peninsula. These algae ...
Effect of plastic deformation on Corrosion of cadmium in 0.1 m sodium Sulphate solution
(
Qatar University
, 1993 , Article)
The present investigation was carried out to study the influence of prior plastic deformation and surface finish on the corrosion behaviour of pure cadmium in 0.1 M Na2SC>4 solution at 25° C. Cylindrical specimens were ...