Browsing Qatar University Science Journal - [From 1981 TO 2007] by Title
Now showing items 384-403 of 770
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A Mathematical Model Of The Dynamics Of Schistosomiasis
( Qatar University , 1996 , Article)In this work the authors develop a mathematical model for the dynamics of a major helminth parasite of man, schistosomiasis. The model is a system of coupled non-linear equations. Numerical experimentations with the model ... -
Measurements Of Radon Permeability Through Some Membranes
( Qatar University , 1994 , Article)The diffusion of 222Rn through different types of membranes has been studied by an equilibrium method using a Si surface barrier a-detector with a resolution of 14 keV FWHM for ^'Am. The permeability constant for Aluminized ... -
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 ... -
Mechanism Of The Inhibition Afforded By Some Hydrazone Oxime Derivatives Towards Aluminium In 2m Naoh Solution
( Qatar University , 1991 , Article)The effect of some hydrazone oxime derivatives on the corrosion of aluminium in 2M NaOH solution was studied by polarization and weight-loss techniques. Polarization data indicated that all inhibitors tested were of a mixed ... -
Meiofaunal Life of Man-Made Wastewater Ponds in Qatar
( Qatar University , 2002 , Article)The meiofaunal life of two wastewater ponds around Doha City was studied for the period October 2000-October 2001. The substrate nature of the two ponds was found to be similar in mean particle sizes but the densities of ... -
Mercury Pollution In Abu Kir Bay East Of Alexandria, Egypt
( Qatar University , 1992 , Article)Abu Kir Bay, east of Alexandria, is subjected to substantial pollution from two direct point sources which are Tabia Pumping Station (TPS) and Lake Edku Outlet (LEO). Mercury was speciated into dissolved reactive, dissolved ... -
Mesozoic Igneous Activity In Egypt
( Qatar University , 1986 , Article)A geochronological sequence of the main phases of igneous activity in Egypt during the Mesozoic is presented in this paper. This is essentially based on scrutinized isotopic age data. New K / Ar ages are also included. Three ... -
Metabolic Effects Of Cyproterone Acetate And Corticosterone In The Chicken Callus Domesticus
( Qatar University , 1990 , Article)The metabolic effects of corticosterone were compared with those of cyproterone acetate , a steroidogenic inhibitor with suggested corticoid-like effects. Corticosterone significantly increased serum levels of ... -
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), ... -
Microbial utilization of some agricultural And agro-industrial waste products for the Production of single cell protein (scp).
( Qatar University , 1993 , Article)The dried residues of com crop (com straw) were hydrolysed by 0.5 NH2SO4. Saccharomyces cerevisiae has been allowed to grow on media containing different concentrations of the com straw hydrolysate (CSH). The optimal ... -
Microdetermination Of Some Organic Nitriles Using The Cyanide Ion Selective Electrode
( Qatar University , 1985 , Article)The response characteristics of the solid state cyanide ion selective electrode toward some organic nitriles are investigated. In 10 M KOH solution, the electrode exhibits near Nemstian response over the range of 10~2 to ... -
Microfacies of the Upper Cretaceous-Lower Tertiary Rocks of Um Rijam Area, South Jordan
( Qatar University , 1982 , Article)This paper deals, for the first time, with the microfacies of the Upper Cretaceous - Lower Tertiary rocks of south Jordan. Twenty three microfacies associations are recognized, described, discussed and illustrated. This ... -
Microscopic Study Of The Rabbit Pancreas After Vagotomy
( Qatar University , 1997 , Article)The microscopic study of the morphological changes in the rabbit pancreas were investigated after vagotomy. Structural changes were observed in the pancreatic acinar cells and in the islets of langerhans two and three weeks ... -
Microwave Spectra of 13CH3C15N and 13CH3 13C 15N Molecules In the Frequency Range 17-95 GHz
( Qatar University , 2002 , Article)Some microwave frequencies of the v^ + Vg vibrational combination band for the two isotopes CH^C N and CH^ C N of methyl cyanide were measured in the frequency range 17-95 GHz, for the transitions AJ = 1<-0, AJ = 2<-1, AJ ... -
Middle-Upper Devonian And Lower Carboniferous Miospore Assemblages From Western Desert Of Egypt
( Qatar University , 1985 , Article)Important morphological features of some spore assemblages from Middle-Upper Devonian and Lower Carboniferous of Western Desert of Egypt are described. Comparing the present assemblages with those obtained from other ... -
Mineral analysis of soil, euphorbia hirta l. And mycoflora from the industrial Yanbu City, Saudi Arabia
( Qatar University , 1995 , Article)Soil and Euphorbia hirta L. samples were collected from five localities from the industrial Yanbu city Saudi Arabia, and analysed for their metal and fungal flora. Soil type is sandy, alkaline and contained low percentage ... -
Mineral Content Of Soil And Wild Plants From Saudi Arabia
( Qatar University , 1996 , Article)Soil and wild plant samples were collected from different localities from the industrial Yanbu city, Saudi Arabia, and analyzed for their mineral content. Soil samples from the tested localities differed greatly and contained ... -
Mineralogical and Chemical Properties of El-Fa Youm Clays
( Qatar University , 1993 , Article)El-Batts Demo Area constitutes a part of El-Fayoum province in Egypt, it is dominated by clay formations 17 meters thickness, covered in part by a thin layer of Pleistocene deposits. XRD studies reveal that smectite is ... -
Mineralogical and Geochemical Compositions of Modern Bivalve Shells from The Mediterranean Coast Of Egypt
( Qatar University , 1993 , Article)The stable isotopic (8 ^C and 8^O) and elemental (Sr and Mg) compositions are presented for marine mollusc Carditacea and Solenacea shells collected off the Mediterranean coast of Egypt. Based on shell microstructures and ... -
Mineralogical And Geochemical Evaluation Of Upper Cretaceous Black Shales, Safaga District, Egypt.
( Qatar University , 1995 , Article)Lithologic and compositional properties of black shale and pyrite from the Upper Cretaceous phosphorite/black shale deposits (Duwi Formation) of Eastern Desert of Egypt indicate similarity in mineralogy, geochemical ...
