Qatar University Science Journal - [From 1981 TO 2007]: المرسلات الحديثة
السجلات المعروضة 561 -- 580 من 770
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Factors Governing Mosquito Susceptibility To Bacillus Sphaericus Strains
( Qatar University , 1992 , Article)Three lyophilized strains of Bacillus sphaericus (1593-4, 2297 and SSII) were tested against four different mosquito species. Culex pipiens larvae demonstrated the highest level of susceptibility towards the 3 B. sphaericus ... -
Some Unique Characteristics Of The Indian Ocean
( Qatar University , 1999 , Article) -
Liquid chromatographic separation of the enantiomers of racemic A aminophosphonates as their n-3, 5-dinitrobenzoyl derivatives On chiral fluorocarbinol stationary phases
( Qatar University , 1994 , Article)The enantiomers of a wide variety of a-aminoaryl (or alkyl) phosphonate esters are separated by liquid chromatography as their N-3,5-dinitrobenzoyl derivatives on three chiral fluorocarbinol stationary phases. In addition ... -
A Study Of Atmospheric Transparency Over Qena In Upper Egypt
( Qatar University , 1995 , Article)Atmospheric transparency over Qena/Egypt has been studied for direct solar radiation values . which were calculated from global and diffuse solar radiation measurements . The mean monthly of the instantaneously transparency ... -
Monovalent Anion Interaction on the Electron Flow of Photosystem II in Soyabean Cells
( Qatar University , 1994 , Article)Steady state of electron transport measurements from water to DMQ (2, 5 - dimethyl - P- benzoquinone) show a maximum bicarbonate effect (about four fold stimulation) following the addition of 5 mM HCO"3 to the previously ... -
Studies on growth and chemical composition of tobacco varieties. IV - comparative effects of various combinations of fertilizers on economic potentialities of tobacco plants
( Qatar University , 1987 , Article)In two experiments, tobacco plants were treated with various combinations of ammonium nitrate (23% N) and compound C (3.5% N, 23% P and 16% K). At all levels used in experiment I, stem length and number of leaves were ... -
Phylogenetic studies on the architectural features of Amphibian (bufo regularis) and mammalian (oryctolagus cuniculus) kidneys
( Qatar University , 1994 , Article)The results of the present study revealed that mesonephric and metanephric kidneys of both the anamniotes (Bufo regularis) and the amniotes (Oryctolagus cuniculus) vertebrates respectively differ morphologically, anatomically ... -
Functions Near Of Na-Continuity
( Qatar University , 1989 , Article)In 1986, the concept of Na-continuity was initiated by Chae et al., this leads us to introduce two classes of functions, namely strongly Na-continuity and weakly Na-continuity. We characterize these new types. Several ... -
Constituents of plants growing in Qatar: part xxviii. Constituents Of cistanche phelypaea
( Qatar University , 1995 , Article)Ten compounds were isolated from the methanolic extract of the aerial parts of Cistanche phelypaea (Orobanchaceae) and identified as echinacoside (1), tubuloside A (2), tubuloside E (3), acteoside (4), 2'-acetylacteoside ... -
A List of Marine Algae from Seashores of Iran (Hormozgan Province)
( Qatar University , 1999 , Article)Seashores of Hromzgan province in south of Iran were studied for collection and recogna-tion of algal flora (1991-1996). 150 species of marine algae were recognized, including 36 Chlorophyta (16 new). 33 Phaeophyta (15 ... -
Parasites As Biological Tags In Population Studies Of Marine Organisms
( Qatar University , 1999 , Article)Parasites have been used to identify and trace the migrations of different intraspecific populations of commercially important marine fish since 1939, Literature research shows how the numbers of publications involving ... -
Geoelectrical Study On The Area West Of Aswan Town, Egypt
( Qatar University , 1992 , Article)A geoelectrical resistivity survey on the area west of Aswan has been conducted in order to investigate its prevailing hydrogeological and subsurface geological conditions. The study demonstrates the occurrence of a probably ... -
Geochemical studies using trace elements analysis of source rocks and related crude oil in the Gulf of Suez, Egypt
( Qatar University , 1997 , Article)The occurrence and distribution of trace elements in source rocks and crude oils is used to asses the process of geochemical exploration. Rock and crude oil samples representing the giant fields of the Gulf os Suez province ... -
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 ... -
Photocatalytic treatment of industrial wastewater
( Qatar University , 1997 , Article)A novel Plexiglas double-skin sheet reactor ( DSSR ) able to use diffuse as well as direct sunlight for the detoxification of industrial wastewater was used. The efficiency of the photocatalytic treatment of a highly ... -
A convenient synthesis of Carbocyclic fused Thieno [2,3-b] Pyridines and Carbocyclic fused IH-Pyrazolo [3,4-b] Pyridines
( Qatar University , 2001 , Article)A synthesis of Carbocyclic fused thieno [2,3-b] pyridines and carbocyclic fused 1H- pyrazolo [3,4-b] pyridines utilizing car-bocyclic fused 2(lh)-pyridinethiones as starting components is described. The structures of the ... -
Plant growth, metabolism and adaptation in relation to stress conditions v. Effects of salinity on the fatty acids of germinating flax, cotton and castor bean seeds
( Qatar University , 1987 , Article)The same three fatty acids were detected in flax, cotton and castor bean seeds: myristic, plamitic and oleic. In addition, linoleic was found in flax and lauric and stearic in castor bean. The seeds were germinated over ... -
Effects Of Overfishing And Abandoning Bottom Trawling On Qatar's Fisheries
( Qatar University , 1996 , Article)The present study was conducted to overview the effects of abandoning bottom trawling and increasing fishing effort on the structure and dynamics of Qatar's fisheries during 1985-1994, using the fishery statistics data, ... -
Filtered Dehomogenization Theory For The Micro-structure sheves OY
( Qatar University , 1999 , Article)In this work we study the theory of dehomogenization at the level of filtered sheaves using the micro-structure sheaves. For the sheaf of quantum section the results are still true. -
Human Resources Development and Institutional Arrangements for Managing Coastal Resources and Environments in the UAE, From Concept to Practice
( Qatar University , 1999 , Article)The coastal area of UAE contains some of the world's richest ecosystems including extensive oil reservoirs, coral reefs and mangrove forests. UAE in fact faces an acute shortage of personnel having the necessary knowledge, ...
