Qatar University Science Journal - [From 1981 TO 2007]: Recent submissions
Now showing items 681-700 of 770
-
Paleoecology, palynofacies, thermal maturation and hydrocarbon source-rock potential of the Jurassic-Lower Cretaceous sequence in the subsurface of the north Easern Desert, Egypt
( Qatar University , 1997 , Article)The Jurassic to Lower Cretaceous sequences in the wells Abu Hammad-1, Q-71-IX and Kabrit-1, north Eastern Desert of Egypt, have yielded palynofacies assemblages of varying composition. Seven palynofacies types which are ... -
Geologic setting of the St. Catherine basement rocks, Sinai, Egypt
( Qatar University , 1993 , Article)St. Catherine area, some 900 km in size, is dominated by basement rocks Encompassing old continental gneisses, metasediments, greenstone belt, calc-alkaline granites (G-II-granites), rift-related volcanics (RV), and ... -
Seismic reflection coefficient parameter-theoretical and Practical approach
( Qatar University , 1994 , Article)In this study, the effect of porosity and pore filler on the reflection coefficient parameter (R), are well deduced and some mathematical expressions were developed. This leads to the establishment of new expression of (R) ... -
Reproductive ecology of the common rock chiton Acanthopleura gemmata (mollusca: polyplacophora) in the Northwestern coast of the red sea
( Qatar University , 1996 , Article)The reproductive cycle of the chiton, Acanthopleura gemmata was studied by observing the gonad indices at two localities in the North-western coast of the Red Sea, from January 1988 to December, 1989. The interrelationships ... -
On A New Haemogregarine Of Varanus Griseus From Egypt
( Qatar University , 1996 , Article)Ten monitors, Varanus griseus collected from various localities in Egypt were examined for protozoan blood parasites. A new species of the genus Haemogregarina senso lato is reported from six of these monitors. Blood forms ... -
Some Enzymatic Activities Of Fungi Isolated From Cotton Seeds And Cotton Seed Products
( Qatar University , 1984 , Article)Five hundred different cultures which belong to fifteen genera and forty-one species, isolated from cotton seeds and cotton seed products were studied for proteolytic, amylolytic and lipolytic activities. About 80% of the ... -
Pullulan production from sugar beat molasses
( Qatar University , 1997 , Article)Sugar beet molasses was used as the substrate for the production of pullulan with Aureobasidum pullulans ATCC 42023. In addition biomass, residual sugar and final pH of the culture medium were investigated. In comparing ... -
Mineralogy and Chemistry of Desert Roses, Ayn Dar Area, Abqaiq, Eastern Province, Saudi Arabia
( Qatar University , 2002 , Article)Desert roses are crystals which usually take the form of rose petal. They have definite crystal shapes, and enclose sand grains. The desert roses were scattered along an area of about 500m2 in the Ayn Dar area, near Abqaiq, ... -
Prenatal Development of the Guinea Pig Kidney Quantitative And Qualitative Morphology
( Qatar University , 1993 , Article)The normal prenatal development of the guinea pig kidney was investigated utilizing quantitative and qualitative histologic methods and microdissection technique during the last of the gestation period (day 46 to day 66). ... -
Distribution And Mineralogy Of The Clay Deposits In Saudi Arabia
( Qatar University , 1993 , Article)The main goal of this paper is to characterize the mineral clay deposits in Saudi Arabia; especially their mineral composition, deposit size, geological setting and possible uses. Different published reports and papers on ... -
Recent Benthic Foraminifera from the Local Water of Qatar, Arabian Gulf
( Qatar University , 2000 , Article)ABSTRACT In the present study, fifty species of Foraminifera are identified from the bottom sediments of the local Qatari waters on the eastern and northern sides of Qatar Peninsula in the Arabian Gulf. These comprise 7 ... -
Plant growth, metabolism and adaptation in relation to stress conditions. Vii. Respiration, nitrogen and proline contents in french bean and maize plants as influenced by salinity
( Qatar University , 1989 , Article)Carbon dioxide production by seedlings, whole plants and leaves of French bean and of maize showed progressively greater increases with increasing concentrations of Na2S04 added to the basal medium. Also, in response to ... -
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 ... -
Effect of Rhizohnim melilotti and VA-mycorrhizac on Forage Yield and Quality of Two Alfalfa Cultivars
( Qatar University , 2003 , Article)An experiment was conducted at the Demonstration Farm of the faculty of Agriculture, University of Khartoum at Shambat during the period December 1997 to June, 1999, to investigate the effect of Rhizobium meliloti and ... -
Decomposition of a Special Type of Machines
( Qatar University , 1994 , Article)In this paper, the concept of a finite n-state cyclic machine An is defined. These machines are then completely characterized using the prime factorization of n. Specifically, it is proved that any finite-state cyclic machine -
Effects Of Gamma Radiation On The Motility And Attraction Of The Mediterranean Fruit Fly Ceratitis Capitata Wied, To Light, Colours And Odour
( Qatar University , 1988 , Article)Full grown pupae of the Mediterranean fruit fly, Ceratitis capitata were irradiated at three gamma dosages (50, 70 and 90 gray). The different effects on the motility and attraction to light colours and odour of the produced ... -
Age Environmental Factors, Germination And Seedling Emergence Of Ocimum Basilicum L
( Qatar University , 1990 , Article)Fresh and exhumed seeds of Ocimuni basilicum L. gave 100 % germination at 13/11-h alternating temperature of 20/10, 32/18, 38/24 and 40/32 °C but did not germinate at constant temperatures. Germination was prevented in the ... -
Petrophysical Studies on Samples from Eocene Exposures West Cairo-Egypt
( Qatar University , 1981 , Article)The present work deals with petrophysical and petrochemical studies on 58 limestone samples of Eocene age in two localities west of Cairo (Sakkara and Giza Pyramids Plateau). The determined petrophysical properties are: ... -
Effect of chemical grafting on the surface structure of porous bentonite as a support in gas chromatography
( Qatar University , 1994 , Article)The effect of thermal and chemical treatments on the variation of specific surface area of porous bentonite as a support was studied. The surface area of bare bentonite thermally treated at 950°C and then washed with ... -
Ruthenium(II), Ruthenium(III) And Osmium(III) Complexes With Rn-Neutral Donor Ligands, And Their Catalytic Oxidative Properties
( Qatar University , 1994 , Article)A number of new complexes [RunCl2 (PPh3)2L], [RumX3 (AsPh3)L] and [OsnICl3(PPh3)L'] [L= o-anthranilonitrile(anth), o-phenylenediamine(phdm), l,10-phenanthroline(phen), 2,2'-bipyridine(bipy); L' = Phen, bipy; X = Cl, Br] ...
