Qatar University Science Journal - [From 1981 TO 2007]: Recent submissions
Now showing items 661-680 of 770
-
Optical Properties Of Oxidated Blown Asphalt Films
( Qatar University , 1996 , Article)Films of purified blown asphalt of high grades of oil and the accompanied adulterated particles derived from its manufacturing process, that is, it was purified 98%. This study focused on optical properties in the wavelength ... -
Effect Of Hydrocortisone On The Skin Of The Developing Chick Embryo
( Qatar University , 1986 , Article)Hydrocortisone treatment of chick embryos caused acceleration of epidermis thickening and keratinization, decrease in dermal cell number and increase of dermal collagenous fibres. The hormone also caused a marked increase ... -
Helminth parasites of fishes from the arabian gulf: 4. On allacanthochasmus lutjani n.sp. And metadena leilae nagaty, 1957 (digenea: cryptogonimidae)
( Qatar University , 1988 , Article)Allacanthochasmus lutjani n.sp. is described from Lutjanus fulviflamma caught from Qatari waters in the Arabian Gulf. It differs from other species of the genus, mainly by the shape and position of the ovary, presence of ... -
Studies On The Trematodes Of The Genus Enenterum Linton, 1910 (Opecoelidae) And The Oenus Pseudocreadium Layman, 1930 (Lepocreadiidae) From Some Red Sea Fish
( Qatar University , 1985 , Article)The genera Enenterum and Pseudocreadium are reviewed. It is suggested that Pseudocreadium indicum Madhavi, 1972 should be considered a synonym of P. balistes Nagaty, 1942. Enenterum pimelopteri Nagaty, 1942, is redescribed ... -
Theory and Computations for Systems Modeled By First Order Differential Equations
( Qatar University , 2000 , Article)A numerical scheme using Sine functions is developed to approximate the solution of a 2 x 2 system of first order differential equations. The error in the approximate solution is shown to converge exponentially. -
Inhibition Effect Of Four Oil Dispersants On Primary Productivity In Qatar Water (Ararian Gulf)
( Qatar University , 1987 , Article)Four major oil dispersant mixtures in seawater wore used to depict their in—situ inhibition ratio to productivity rate of natural phytophanklon populations in Qatar water — Arabian Gulf — during the spring season of 1986. ... -
Stereochemistry of some high coordination compounds of dioxouranium(VI) With thiosemicarbazones
( Qatar University , 1994 , Article)The UO2 ion is peculiar in its coordination behaviour, because of its inherent capacity of forming compounds with higher coordination number. In the present work we describe the synthesis of a series of eight, nine and ten ... -
Red cell superoxide dismutase in patients with different liver diseases
( Qatar University , 1995 , Article)Supcroxidc dismutase (SODs, supcroxidc oxidoreductasc, E.C. 1.15.1.1.) activity has been estimated in red blood cells from patients suffering from liver cirrhosis and hcpatoccllular carcinoma. Erythrocytcs supcroxide ... -
Window Analysis Optimization Of Gas Chromatographic Separation Using Different Polarity Packed Columns
( Qatar University , 1996 , Article)Window diagram theory has been described by Purnell and his research team in various publications. In this paper we apply this theory to optimize a separation of complex mixture containing propylene oxide, 1-hexene, ... -
Some Histological And Histochemical Aspects Of Egg-Implantation In The Rat
( Qatar University , 1987 , Article)The rat embrayo and uterine epithelium were studied during implantation at 129h p.c., 138h p.c. and 153h p.c., stages. The basophilic bodies found in the iiinpr cell mass and in the uterine epithelium represent dead cells ... -
Botanical Exploration Of Sinai
( Qatar University , 1985 , Article)The history of the botanical exploration of Sinai has been reviewed. It has been divided into the following periods: I. Expeditions in the eighteenth century. II. Exploration from 1800 till the publication of "Florula ... -
The interaction between adults and recruitments in the brachidontes variabilis l. (lamellibranchiata) bed in the bitter great lake, suez canal
( Qatar University , 1992 , Article)The purpose of the present study was to test two hypotheses concerning the interactions between adults and recruitments in the densly-packed assemblages of a population of suspension feeder (Brachidontes variabilis L.) in ... -
Formation of Usual and Bridging Complexes using organoselenium and -Tellurium compounds
( Qatar University , 2005 , Article)The reactions of l,3-benzoselenadiazole with some diiodo selenium and tellurium heterocyclic compounds have led to the formation of charge transfer complexes. From the same reactions but in the presence of I9PtC14 new types ... -
Physiological growth analysis of the life-history of calotropis procera (AIT.) AIT. F.
( Qatar University , 1992 , Article)Growth of Calotropis procera was analysed by distribution of dry weight throughout the plant at various stages in growth. Dry biomass, leaf area index, specific leaf area, leaf weight ratio, leaf area ratio, net assimilation ... -
Air-Borne Fungi Of Wheat Fields In Egypt
( Qatar University , 1983 , Article)The air borne fungi of wheat fields in El-Minya Governorate were studied during the periods January-May 1977 and December 1977-May 1978 using the plating catch method on 1% glucose and 50% sucrose-Czapek's agar. Fifty-two ... -
Condition and trend of a depression-type habitat In rainfed desert rangelands of Qatar In response to fertilizer application
( Qatar University , 1994 , Article)Characteristics of a rainfed depression-type habitat in desert ranges, and its response to fertilizer application were studied. A single fertilizer application at a rate of 75 Kg ha1 prior to the rainy season improved range ... -
On The Formation of Intermediate & Deep Water Masses in The Eastern Mediterranean
( Qatar University , 2000 , Article)In the eastern Mediterranean, three main water masses are classified: Modified Atlantic Water of Atlantic origin, Levantine Intermediate Water (LIW), formed in winter during storm events and Eastern Mediterranean Deep Water ... -
Water Conditions And Proline Content In Shade And Sun Plants
( Qatar University , 1984 , Article)Different parameters of the water conditions (Water content, water saturation deficit, osmotic pressure of the cell sap and partial osmotic pressure due to sugars), chlorophyll and proline contents were investigated in sun ... -
Thermal Acclimation In The Resting Metabolism Of The Nocturnal Gecko, Hemidactylus Flaviviridis
( Qatar University , 1996 , Article)Hemidactylus flaviviridis was acclimated to two temperature regimes (20 and 30°C). The resting metabolic rates (ml g1 h"1) were determined at 20, 25,30 and 35°C, using constant pressure manometric respirometers. The 20°C- ... -
Coral Bleaching And Enso Anomaly : Was The Past Similar To The Present
( Qatar University , 1999 , Article)Bleaching of reef corals is due to partial or total loss of symbiotic micro-algae as a consequence of environmental stress such as an oceanic warming linked to the ocean-scale hydroclimatic anomaly termed ENSO (El Nino ...
