Browsing Qatar University Science Journal - [From 1981 TO 2007] by Title
Now showing items 231-250 of 770
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Electrochemical behaviour of some pyrimidine derivatives: polarographic reduction of 1, 3-dimethyl-2, 4, 6(1h, 3h, 5h) pyrimidinetrione and its substituted 5-phenylazo
( Qatar University , 1994 , Article)The polarographic behaviour and spectrophotometric pKa of 1,3-dimethyl barbituric acid and 5-phenylazo substituted products were investigated in buffer solution of pH ~ 2-11. The results revealed an azo form of the substituted ... -
Electron microscopic and autoradiographic analysis of the distribution of the vagus nerve in the ferret stomach
( Qatar University , 1999 , Article)In this study, tritiated leucine was injected into the vagal dorsal motor nucleus after acute and chronic partial vagotomy. The method of sampling of the stomach, application of % 2 test and the analysis of the electron ... -
Electrophoretic patterns of proteins and enzymes in paramphistomum (p.) Microbothrium and carmyerius gregarius
( Qatar University , 1990 , Article)The electrophoretic patterns of total soluble proteins, esterases, Glutamic-oxaloacetate transaminase (GOT) and malate dehydrogenase (MDH) are determined in two paramphistomes, infecting cows and buffaloes, namely ... -
Elliptic surfaces over a genus 1 curve with exactly the pair (I8, IV) of singular fibers
( Qatar University , 2000 , Article)In this paper we classify all minimal elliptic surfaces (TI : E —> C) over a genus 1 curve C, with a section and exactly the pair (Is, IV) of singular fibers. -
Elliptic surfaces over a genus 1 curve with the pair (l3, l9) of singular fibers.
( Qatar University , 2000 , Article)In this paper we give a classication of all minimal elliptic surfaces (n : E —> C, g(c) = 1) with a section and exactly the pair (L, L)) of singular fibers. -
Embryonic Development Of The Olfactory Organ In Mice
( Qatar University , 1994 , Article)The development of the olfactory organ in the prenatal stages of mice (Patch/normal Balb/c) was studied. Eight stages were selected for this study; they are 9,10,11,12,13, 14,16 and 18 days of gestation. At 9 days of ... -
Empirical Investigation Of Wave Velocities In Bahariya Formation, Western Desert, Egypt
( Qatar University , 1994 , Article)In the Meleiha Oil Field, Western Desert of Egypt, eleven selected drilled wells were chosen to investigate the seismic velocities in the Bahariya Formation. The velocity-depth relations were studied and equated. The ... -
Energy Exchange Between The Sea And The Atmosphere At Doha Harbour (Qatar) In The Arabian Gulf
( Qatar University , 1996 , Article)Meteorological and oceanographic data from 1979 to 1988 have been analyzed and utilized to calculate the heat budget terms of the water at Doha Harbour. The monthly mean of solar radiation has the largest annual amplitude, ... -
Enzymatic Upgrading of Fish and Crustacean Products
( Qatar University , 1999 , Article)Fish wastes constitute an important source of biologically active molecules possessing peculiar properties and practical application promises in various areas ( agriculture, medicine, chemistry, biotechnology ). Several ... -
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 ... -
Evaluation of Electron Swarm Parameters in SF6 Using Monte Carlo Method
( Qatar University , 2005 , Article)The motion of electrons in sulfur hexafluoride (SFo) in uniform electric fields is simulated using a Monte Carlo method. The swarm parameters are evaluated and compared with experimental results of drift velocity, electron ... -
Evaluation Of Hydraulic Parameters For Dara Area (Gulf Of Suez), Egypt
( Qatar University , 1991 , Article)This work aims to furnish a basis for evaluating the water resources in Dara Area which is one of the vergin areas assigned for the purpose of land reclamation. Analysis of pumping and recovery tests performed in the study ... -
Evaluation of methods for screening of extracellular cellulase In filamentous fungi
( Qatar University , 1996 , Article)Twenty-eight fungal species belonging to fifteen genera were isolated from Saudi Arabian soil and were screened for the production of extracellular cellulase enzymes. Cleared-zone technique, cellulose azure method and agar ... -
Evaluation of quaternary aquifer between qena and luxur. (Nile Valley, Egypt)
( Qatar University , 2001 , Article)In order to evaluate the hydrogeological setting of the Quaternary aquifer and the related geological structures controlling its characteristics. A total of 50 vertical electrical soundings (VES.s) were conducted along 13 ... -
Evaluation Of Soil And Water Resources In Wadi Wardan, Sinai, Egypt, Using Electrical Resistivity Method
( Qatar University , 1985 , Article)A number of 15 Vertical Electrical Soundings were carried out in the Delta of Wadi Wardan, on the western coastal zone of Sinai, about 55 km south of Suez. The study objectives were to find out the change in thickness of ... -
Evaluation of Some Local Egyptian Plants as a Source of Chlorophyll Pigments
( Qatar University , 1994 , Article)Four plant materials viz. Spinacia oleracae Linn, (spinach), Beta vulgaris Limm (chard), Medicago sativa Linn, (alfalfa) and Petroselinum sativum Hoff. (parsely) were studied as local sources for the preparation of chlorophyll ... -
Evidence of an authigenic origin for palygorskite in a Middle Eocene carbonate sequence from North Qatar.
( Qatar University , 1997 , Article)The "Simisma Member" from the Ras Laffan area in North Qatar is mainly composed of dolomites of shallow marine origin. Clay minerals contained in the dolomite (average 4%) are mainly palygorskites. There is no indication ... -
Experimental Investigation of the N-Pbs/P-Si Heterojunction Band Lineup with I-V and C-V Measurements
( Qatar University , 2005 , Article)In this paper we present experimental investigation of band lineup of near ideal PbS/Si heterojunction diode using I-V and C-V measurements. The C-V measurements show that the fabricated diodes were abrupt type, and the ... -
Explicit Forms of Conservation Laws of a Class of Differential Equations
( Qatar University , 1994 , Article)Explicit forms of conservation laws of a class of nonlinear partial differential equations are derived; firstly from BScklund transformation and secondly from the. fundamental equations of the corresponding inverse method. -
An Extension of the Szasz-Mirakyan Operator on the Whole Real Axis
( Qatar University , 2000 , Article)The aim of this paper is to present a new extension of the Szasz-Mirakyan operator n the whole real axis, and to give its convergent approximation theorem.