Browsing Qatar University Science Journal - [From 1981 TO 2007] by Title
Now showing items 164-183 of 770
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Distribution, Genesis And Thermal Behaviour Of Clay Minerals In The Miocene Argillaceous Rocks In Qatar, Arabian Gulf
( Qatar University , 1989 , Article)XRD and DTA were utilized to investigate quantitatively the clay-mineral composition of the argillaceous rocks in four Miocene stratigraphic sequences located in western and southwestern Qatar. These rocks belong to the ... -
Diversity, Habitats and Seasonal Distribution of Fish in Three Protectorates of Southern Sinai on the Red Sea, Egypt
( Qatar University , 2000 , Article)The present investigation is an attempt to study the diversity, habitats and seasonal distribution offish of inshore water at thirteen sites of the three Protectorates (Ras Muhammed, Nabq and Abou Galoum) of Southern Sinai ... -
Does Egypt Represent an Ecological Limit to Desiccation Tolerant Plants?
( Qatar University , 2006 , Article)A search of arid areas adjacent to the Nile in Egypt revealed a notable lack of desiccation tolerant vascular plants on ecological sites on which they would be abundant in Kenya and further south in Africa. Relative water ... -
Dominance Value And Community Production Of Desert Arthropoda In Qatar
( Qatar University , 1999 , Article)Diurnal sampling of epigeal Arthropoda from different desert habitats in Qatar was carried out at the end of the summer season (October) and in spring (April) of 1995, 1996 and 1997. Dominance values of the species collected ... -
Early Cretaceous Dinoflagellate Cysts And Miospores From The Mersa Matruh 1 Borehole, North West Desert, Egypt
( Qatar University , 1994 , Article)This study aims to document the Neocomian to Aptian palynological assemblages recorded in the Mersa Matruh borehole, north West Desert, Egypt. These palynological assemblages, consisting mainly of dinocysts, miospores and ... -
An early marker of monoclonal light chain protein In bladder cancer
( Qatar University , 1994 , Article)Bladder cancer complicating schistosomiasis is a major cause of cancer mortality in Egypt. It affects farmers who suffer from repeated and severe chronic schistosomal cystitis. The late presentation of this disease is ... -
Earth Resistivity And Self-Potential Study On The Area East Of Sohag City And Their Groundwater Implications
( Qatar University , 1993 , Article)Nineteen field vertical electrical soundings have been made in the area east of Sohag to provide hydrogeologic information for groundwater exploration. These sounding are interpreted using programs for the automatic ... -
ECG Abnormalities Induced By Scorpion Venom Administration: The Effect And The Mechanism
( Qatar University , 1994 , Article)Intramuscular administration of scorpion (Leiurus quinquestriatus) lyophilized venom (100, 200 and 400 mg/kg) into rats produced drastic changes in the electrical activity of the cardiac muscle. These abnormalities were ... -
Ecological and phytochemical studies on the "miswak", salvadora persica l.
( Qatar University , 1984 , Article)The "Miswak", which is produced from the stolons and branches of Salvadora persica is used as a substitute for ordinary tooth brushes. The use of "Miswak" has been recommended by Islam. It is endowed by several characteristics ... -
Ecological Characteristics Of The Littorial Fauna At Tubli Bay, Bahrain
( Qatar University , 1995 , Article)Papers presented at The gulf symposium on Environmental biology, University of Qatar, 7-9 May 1994 *********** The intertidal fauna inhabiting a wide range of habitats at Tubli, an inshore bay on the eastern part of ... -
Ecological Notes On The Floristic Composition And Endemic Species Of Saint Catherine Mountains, South Sinai, Egypt
( Qatar University , 1995 , Article)The present study is aimed at (1) giving complete list of all plant speciec growing in Saint Catherine mountains, (2) studying the relationship between species number and the amount of precipitation at the time of study ... -
Ecological Studies On The Bottom Fauna Of Lake Manala, Egypt
( Qatar University , 1990 , Article)An ecological survey has been conducted for the benthic Community in Lake Manzala during May and June, 1985. The diversity and distribution of organisms are largely determined by salinity. Mean abundance of benthic fauna ... -
Ecology and biodiversity profile of the Genus Streptomyces in the soil of the State of Qatar
( Qatar University , 2007 , Article)Ecology and biodiversity profile of Streptomyces in the soil of Qatar have been studied in 123 soil samples from different sites distributed all over the country. Moisture contents of soils samples ranged between 0.2-8.8% ... -
Ecophysiological Characteristics, Distribution, and Nutritional Value of Desert Range Plants in Qatar
( Qatar University , 1993 , Article)Despite the scarcity of water, desert ranges of Qatar can support a characteristic diversity of species and an all-year-round supply of feed. A correlation between carbon dioxide fixation mechanism, distribution of species, ... -
Ecophysiology Of Desert Animals
( Qatar University , 1995 , Article)The principal environmental problems that confront both plants and animals in the desert are water shortage and flooding, thermal extremes, and the absence of cover. Adaptational responses to these include cryptobiosis, ... -
Edaphic Gradients And Species Attributes Influencing Plant Distribution In Littoral Salt Marshes Of Qatar
( Qatar University , 1994 , Article)Edaphic gradients of moisture and salinity are critical environmental stresses that seriously influence littoral salt marsh flora, and determine the zonation of coastal vegetation. Shoreline communities subjected to severe ... -
Edaphic properties and soil cyanobacteria of South Western Saudi Arabia.
( Qatar University , 1997 , Article)Three sites at each of five localities, in the South Western Region of Saudi Arabia were surveyed during 1992, for their soil physico-chemical properties, and cyanobacterial communities. The soils were moderately calcareous, ... -
Effect Of "Ethrel" On Colour Development And Juice Quality Of Sweet Oranges And Grapefruits
( Qatar University , 1994 , Article)"Ethrel" was sprayed at 0,120, 420 and 480 ppm on sweet orange and grapefruit trees at fruit maturity stage to improve colouring and juice quality. Changes in fruit colour were observed in both varieties but the results ... -
Effect Of Adsorption Of Tetrabutylammonium Chloride In Polarography
( Qatar University , 1994 , Article)The polarographic behaviour of chromate, iodate and zinc has been investigated in the presence of different concentrations of tetrabutylammonium chloride in 0.1 M Na2SO4 and 0.1 M H2SO4. The effect of organic compound on ... -
Effect Of Ca++ And Mg++ On The Binding Of Cytoplasmic And Nuclear Estradiol Receptors In Breast Cancer Of Female Patients
( Qatar University , 1993 , Article)Specific estradiol receptors were quantitatively determined in the cytosol and nuclear fractions of four cancerous breast tissues and one normal uterus. Validated methods are described for estradiol receptor assay. The ...