Browsing Qatar University Science Journal - [From 1981 TO 2007] by Type "Article"
Now showing items 41-60 of 770
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Appraisal into Phytochemistry and Taxonomy of an Old Plant Collection from The Middle East
( Qatar University , 1997 , Article)The English traveller Richard Pococke (1704 -1765) visited the Middle East during the period 1737-1740 and collected medicinal plants from localities in Egypt and Arabia. This collection gave a description of the Middle ... -
Approximate Solution For A Problem Of Propagation Of Elastic-Plastic Wave In The Half-Space
( Qatar University , 1984 , Article)In this paper, we consider a half-space occupying an elastic-plastic medium. Treatments were carried out under the assumption of perpendicular load, on boundary which propagates with a constant speed D. The assumption ... -
Approximating the Distribution of Quadratic Forms Using Orthogonal Polynomials
( Qatar University , 1999 , Article)In this paper we propose some techniques to approximate the distribution of quadratic forms in normal random variables. The first two techniques will be based on orthogonal polynomials, namely; the Hermitte and Laguerre ... -
An Approximation Leading To The Binomial Distribution In The Stochastic Treatment Of A Reversible Chemical Reaction
( Qatar University , 1992 , Article)The exact equilibrium distribution of the number of molecules of C in the reversible chemical reaction A+B ^=S: C is shown to converge to the binomial distribution when N is finite, M—»!K, K—>0 in such a way that KM is ... -
Aptian To Cenomanian Palynomorphs From The Qarun 2-1 Borehole, Western Desert, Egypt
( Qatar University , 1993 , Article)Rich distinctive, miospore assemblages are recovered from four sidewall core samples obtained from the Kharita Member of Burg El Arab Formation in the Qarun 2-1 borehole located in the eastern part of the North Western ... -
Ascending urinary tract infection in rats caused by Proteus mirabilis
( Qatar University , 1997 , Article)A model for ascending unobstructed urinary tract infection was developed in female rats to study the pathogenesis of urinary tract infection by Proteus mirabilis. Urinary bladders of rats were inoculated by I. V. cannula ... -
Assessment of Coral Reef Communities At Abu-Dabab, North of Marsa Alam Egypt
( Qatar University , 2003 , Article)The coral reef communities in the area of Abu Dabab, north of Marsa Alam were assessed using rapid underwater technique. Three adjacent reefs were studied to reveal the actual status of the reefs and its damaged parts. ... -
Assessment of heavy metal accumulation and performance Of some physiological parameters in zea mays l. And Vic1a faba l. Grown on soil amended by sewage Sludge resulting from sewage water Treatment in the state of qatar
( Qatar University , 1995 , Article)Pot experiment was conducted to explore extent of concerns regarding agricultural use of sewage sludge for crop production in the state of Qatar. Extent of heavy metal accumulation and its subsequent impact on physiological ... -
Assessment of metals pollution in the sediments of lake burullus, s.e. Mediterranean, egypt
( Qatar University , 1995 , Article)The present study aims to quantify the heavy metals contents in the sediments of Lake Burullus. Cu, Pb, Zn, and Cd were analyzed using ICP spectrometer. The contamination factors (CF) were calculated for each element. The ... -
Attenuation Of Bacillus Cereus Spores By Different Factors
( Qatar University , 1993 , Article)The spore suspension of Bacillus cereus K] ]s was exposed to different concentrations of NaCl. NaNo3 and NaNC>2 as curing agents. The spores were able to tolerate 10% NaCl. Up to 4%, NaNC>3 had little or minor effects on ... -
The Availability Of Iron In Soil And Plants Treated With Organic And Inorganic Fertilizers In The Jordan Valley
( Qatar University , 1995 , Article)This paper deals with the rcults of a study carried out on "Phoseolus vulgaris - Wed" as an indicator of chlorosis. The study took place between July 1990 and July 1992, and for two crop seasons each year. Six kinds of ... -
Azo-Hydrazo Tautomerism: Further Evidence Based On Polarographic Reduction And Acidity Function Of Some Heterocyclic Compounds Containing Oximino-Group
( Qatar University , 1994 , Article)Potentiometric pKa and polarographic behaviour of l,3-indandione-monoxime-2-phenyl azo and four of its substituted derivatives were investigated in buffer solution of pH -2-12. The results showed that the compounds are in ... -
The Backlund Transformation Of A Kp-Like Class Of Nonlinear Partial Differential Equations
( Qatar University , 1996 , Article)The Backlund transformation of a class that behaves in a manner similar to that of the Kadometsev-Petviashli is derived via the use of a transformation that couples this class with a modified given class of the same order. ... -
Balanced Cross-Section Across The Southern Utah Overthrust Belt (Otb)
( Qatar University , 1995 , Article)Balanced cross-sections are offering the chance of better understanding of areas of complex geological structures that are insufficiently understood. Detailed field study and structural analysis by employing geometric ... -
Bayes Estimation of the Parameter of Burr Type II Distribution in Case of Type II Censoring
( Qatar University , 1997 , Article)Suppose that Xj, X2, ..., Xn is a random sample of failure times from a Burr type II (B2) distribution with parameter 9. Let x = (xj, x2, , xr) with xj < x2 S x3 < < xr be the observed failure censored sample of the first ... -
Bio Accumulation Of Chromium, Nickel, Lead And Vanadium In Some Commercial Fish And Prawn From Qatari Waters
( Qatar University , 1997 , Article)A total of 150 fish and prawn samples representing the most economically important species were collected during 1995-96 by experimental fishing in three locations covering the coastal waters of Qatar. Fish and prawn flesh ... -
Biochemical And Environmental Studies On Hepatoma Patients In Egypt
( Qatar University , 1994 , Article)The present study was carried out on 102 hepatoma patients collected mainly from the National Cancer Institute, Cairo University, during the period 1988-1991 . Environmental and personal data were collected for each patient. ... -
Biochemical Characterization Of Human Schistosomes And Their Molluscan Hosts By Electrophoretic Techniques
( Qatar University , 1994 , Article)The recent application of biochemical techniques in taxonomy markedly improved the specific identification and strain characterization of a wide range of living organisms. These techniques are gradually replacing classical ... -
Biochemical composition of the copepod euterpina acutifrons from the Coastal waters of alexandria
( Qatar University , 1994 , Article)Protein, carbohydrate and lipid contents were determined in the most numerous and wide spread copepod Euterpina acutifrons collected from the coastal waters of Alexandria. Protein is the major biochemical component of the ... -
Biochemical Composition Of The Squid (Loligo Vulgaris) (Mollusca) From The Mediterranean Waters Off Alexandria, Egypt
( Qatar University , 1996 , Article)The seasonal biochemical variations of the squid Loligo vulgaris from the Egyptian Mediterranean waters off Alexandria were studied during November 1989 through August 1990. Water, lipid, protein and ash contents were ...