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Now showing items 171-180 of 451
Synthesis Of Some Glycyrrhetic Acid Sulfonamide Derivatives With Prospected Antimicrobial Activity
(
Qatar University
, 1994 , Article)
Some glycyrrhetic acid sulfonamide derivatives (I-VIII) were prepared. Apart from their chemical structures which were confirmed by elemental analysis, IR, 'H and ^C-NMR, their behaviour under electron impact was also ...
The Study Of Compaction Using Seismic Velocity Analyses In East - Baghdad Oil Field (Mid - Iraq)
(
Qatar University
, 1995 , Article)
The present study deals with estimation of empirical equations relating travel time (T) and transit time (T.T) with depth (Z) which are expressed in the forms :
T = BZN + A, log T. T. = - s log Z + H
For this aim, ...
Inhibitory Effect Of Some Oc —Aminocarboxylic Acids On Corrosion Of Aluminium In Hydrochloric Acid Solution
(
Qatar University
, 1992 , Article)
The corrosion of metallic aluminium in 2N hydrochloric acid solution in the presence of L-alanine, L-tyrosine, L-histidine and L-tryptophan as corrosion inhibitors has been studied using hydrogen evolution and thermometric ...
Constituents of plants growing in qatar part xxvii: flavonoids Of cymbopogon parkeri
(
Qatar University
, 1995 , Article)
The study of the flavonoids of Cymbopogon parkeri resulted the isolation and indentification of tricin and isoorientin. Three other flavonoids have been isolated and partially identified.
Combined effects of gamma radiation and Some physical factors on the rate of development of culex pipiens complex(L)
(
Qatar University
, 1993 , Article)
The present work deals with the role of some physical factors, applied separately or combined with gamma radiation on the Fj rate of development of Culex pipiens L. when treated in the pupal stage. The results showed no ...
A 6th-order local approximation by a cubic curve
(
Qatar University
, 1997 , Article)
We derive and present a MAPLE program for the construction of a parametric cubic polynomial curve which has sixth-order contract with a given smooth curve at a given point, thus providing a local sixth-order approximation ...
The blood cells of a sea urchin from abou-kir coast Alexandria, Egypt.
(
Qatar University
, 1993 , Article)
The blood cells of a common sea urchin, collected from Abou-Kir region, were investigated using light and electron microscopy. Their distribution, properties, characteristics and histogenesis were determined. On the basis ...
Enzyme production and antibiotic susceptibility of propionibacterium acnes and p. Granulosum from acne vulgaris patients and healthy persons
(
Qatar University
, 1996 , Article)
Seventeen strains of Propionibacterium acnes and ten strains of P. granulosum were isolated from acne patients, in addition to ten isolates of each species from healthy persons. All strains were examined for their enzymatic ...
Multielement Analysis Of Suspended Particulates In Doha (Qatar) Air Before And During The Gulf War
(
Qatar University
, 1994 , Article)
Efforts have been made to study the effect on Qatar atmosphere from the burning of Kuwait oil fields during the Gulf war. Analysis of suspended air particulates was done by X-ray fluorescence technique. Eight elements were ...
A Problem In Thermoelasticity With Two Relaxation Times For An Infinite Thermoelastic Layer
(
Qatar University
, 1995 , Article)
The problem of a ihcrmoclastic layer of finite thickness and infinite extent is considered within the context of the theory of thcrmoclasticity with two relaxation times. The upper surface of the layer is taken as stress ...