Qatar University Science Journal - [From 1981 TO 2007]: Recent submissions
Now showing items 521-540 of 770
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Abscisic acid, relative water content and water use efficiency of wheat plants In relation to grain pretreatment by phytohormones and irrigation with sea water
( Qatar University , 1999 , Article)Irrigation of wheat plants with sea water (10% and 25%) led to significant increase in free and bound ABA in the leaves, especially at 25%. The relative water content (RWC) of the sea water irrigated plants was either ... -
The Coliform Bacteria in the Wastewater Ponds of Doha City, Qatar
( Qatar University , 2003 , Article)The microbiological study of the wastewater and its sediment around Abu-Hamour pond (untreated wastewater pond) and Abu-NakhIa pond (treated wastewater pond), located on the outskirts of Doha City, revealed that coliform ... -
Blood Gases Of The Water Snake, Natrix Tesselluta, And The Desert Snake, Eryx Colubrinus
( Qatar University , 1983 , Article)1. This comparative study examines 0^ dissociation curves of blood of two colobrine snakes: an aquatic snake, Natrix tesselluta, and a desert snake, Eryx colubrinus. 2. In the case of the whole blood of the aquatic snake, ... -
Application of the resistivity method to study ground water potentialities on a part of the entrance of wadi el-assiuti, Eastern desert, Egypt
( Qatar University , 1993 , Article)Wadi El-Assiuti is located east of Assiut city and extends in almost northeast direction. The entrance of the wadi is suitable site for reclamation and city planning projects. Consequently, it is very important to study ... -
Density and diversity of the desert Arthropoda of Qatar
( Qatar University , 1997 , Article)Density and diversity of arthropods were studied at different habitats of the Qatari desert. Diurnal sampling was conducted at two seasons of the year, the end of the dry season, at the beginning of autumn (October) in ... -
Phytochemical Studies On The Marine Algae Of Qatar, Arabian Gulf
( Qatar University , 1990 , Article)The most dominant twenty three algal species representing the main three groups of benthic macroalgae, Chlorophyceae, Phaeophyceae and Rhodophyceae were collected from the coastal zones of the Qatar peninsula. These algae ... -
Nitrogen fixation in polluted sea water of Alexandria coast, Egypt.
( Qatar University , 1990 , Article)The inshore area of the Mediterranean water, west of Alexandria, Egypt, is subjected to different types of pollutants. Nitrogen fixation rate was studied in this area in relation to some environmental factors such as pH, ... -
Khashm Formation, A New Lithostratigraphic Unit Within The Cretaceous Wasia Group Of Arabia
( Qatar University , 1988 , Article)The Khashm Formation is introduced as a new lithostratigraphic unit to include the sandstones and shale interbeds which constitute the upper part of the Cretaceous Wasia Group (s. /.) outcropping in central Arabia. It ... -
Cytology and palynology of common monocots in mariut, egypt i. Common species of the families alliceae and liliaceae
( Qatar University , 1994 , Article)The present sludy includes cytological and palynological investigations of five species belonging to the families Alliaceae and Liliaceae, as an impetus for more in-depth floristic, taxonomic and phytogeographical ... -
The Tidal Range And The Observed Sea Level Variations At Alexandria Harbour
( Qatar University , 1994 , Article)On the basis of sea level observations of five years period (1975-1979), the basic properties of the tidal range at Alexandria are described. The problem of the combined effect of tides and meteorological factors on sea ... -
Effects of the electric field and gamma Radiation on the optical properties of Modified low density polyethylene
( Qatar University , 1997 , Article)The effect of electric field and gamma radiation on the optical properties of low density polyethylene LDPE grade CD 0230 have been studied. The samples were irradiated at gamma doses of 0-100 Mrad and varying electric ... -
Toxic Effect Of Lannate On Cellular Defence System In Erythrocyte Of Rat
( Qatar University , 1996 , Article)Lannate 1 - methomyl was incubated with erythrocytes of rats at different concentrations. It has been observed that there was a decrease in the activities of superoxide dismutase and glutathione reductase after 1/2 and 16 ... -
Constituents Of Cymbopogon Species
( Qatar University , 1986 , Article)A comprehensive review of the Cymbopogon species including the essential oils and their constituents is given. An account of the other components viz. non volatile terpenoids and phenolic compounds is also given. The ... -
Stratigraphy and paleobathymetry of upper cretaceous-lower tertiary exposures in beris-doush area, kharga oasis, western desert, Egypt.
( Qatar University , 1990 , Article)The detailed study of the Upper Cretaceous-Lower Tertiary succession exposed in Beris-Doush area enabled the subdivision of this succession into a number of rock units well known in the Nile Valley facies area in Egypt. ... -
Vertical Distribution And Inter-Relations Of Oxygen And Nutrients In The Arabian Gulf And The Gulf Of Oman In Summer
( Qatar University , 1990 , Article)The distribution patterns of oxygen and nutrients (phosphate, nitrate, nitrite and ammonia) were studied along the Arabian shelf of the Arabian Gulf and the Gulf of Oman, including the Strait of Hormuz, during September, ... -
Integration technique for neutron source standardization inside A cylindrical water tank
( Qatar University , 1993 , Article)This work deals with the evaluation of neutron irradiation facility. Two (Pu-Be) sources and two (Ra-Be) sources are used. Integration technique by a BF3 detector for neutron source standardization is used. The necessary ... -
Geomagnetic Trend Analysis In The Fayum District, Western Desert, Egypt
( Qatar University , 1984 , Article)The present paper contains brief results of the trend analysis of the aeromagnetic survey in the Fayum District, Western Desert, Egypt. The trend analysis was the constructed magnetic maps which included the total magnetic ... -
Application of optimum offset shallow seismic reflection technique In the area of west el fashn, egypt
( Qatar University , 1996 , Article)A shallow optimum offset reflection survey was performed in El Fashn area. The purpose of this survey was to determine the continuity of the subsurface boundary conditions The optimum offset shallow seismic reflection ... -
Variation Of The Electrical Properties Of Manganese Thin Films With Deposition Conditions
( Qatar University , 1989 , Article)The behaviour of the electrical properties of manganese thin films of different thickness (240 - 1500 A) evaporated under different deposition conditions was studied. The effect of the rate of evaporation (1-7 A/s), the ... -
Kinetics and Mechanistic Studies of the Bromination of Some Substituted Tetralones, Part 1
( Qatar University , 2000 , Article)The rate of bromination of 2-benzal-l-tetralone (II) and its derivatives p-methyl (12), 77-chloro (13), ffi-chloro (14), and p-nitro (15) have been studied in chloroform. The study indicated first order dependence on each ...
