Browsing Qatar University Science Journal - [From 1981 TO 2007] by Language "en"
Now showing items 1-20 of 769
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17- Hydroxylation Of Progesterone By Cunninghamella Echinulata On A Laboratory Fermentor Scale
( Qatar University , 1985 , Article)The mircrobiological transformation of progesterone by a local isolate of Cunninghamella echiiiulata using a laboratory fermentor was studied. Progresterone (10-50 g/1) wetted by Tween 80 was added to 48-hour old culture ... -
A 6th-order local approximation by a cubic curve
( Qatar University , 1997 , Article)We derive and present a MAPLE program for the construction of a parametric cubic polynomial curve which has sixth-order contract with a given smooth curve at a given point, thus providing a local sixth-order approximation ... -
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 ... -
Abundance Of Insects And Mites Infesting Stored Grain And Animal Feed In Riyadh And Dammam Provinces, Saudi Arabia
( Qatar University , 1994 , Article)Insects and mites infesting wheat, maize and wheat bran, stored in plants at Riyadh and Dammam, Saudi Arabia, were scanned in 2 seasons, 1987 and 1988. Grains from the local markets and dust from both provinces were also ... -
Acid-Base Status Of Blood Of Varanus Griseus And Uromastyx Aegyptius
( Qatar University , 1984 , Article)1) A comparative study was carried out on the acid-base status of blood collected from five main blood vessels of two desert lizards, the monitor, Varanus griseus, and the dabb, Uromastyx aegyptius. 2) Blood of the monitor ... -
Acute Toxicity Of Some Oil Dispersants To Mullet Fry ( Liza Macrolepis) Of The Arabian Gulf
( Qatar University , 1986 , Article)The acute toxicity of Shell LTX, Shell Concentrate, Servo CD 2000 and Exxon OSD 9217 were used to calculate 72 - hr. LC ci\ and toxicity curves to the Mullet Fry ( Liza macrolepis) under the Arabian Gulf conditions (Temp. ... -
Additions to the flora of Qatar
( Qatar University , 1997 , Article)Collections and earlier studies on the plants of Qatar are limited and of recent origin — since the seventies. The latest of these in 1983 (El Amin) listed 300 species belonging to 202 genera in 56 families. At present, a ... -
Adenylate Energy Charge As A Tool For Evaluating Sub-Lethal Toxicity
( Qatar University , 1999 , Article)Adenylate energy charge (AEC) is directly related to the cellular concentrations of the three adenylates nucleotides ATP, ADP and AMP. This biochemical index reaches high values (0.9) under optimal conditions but drops ... -
The Adjoint Problem Of A Modified Sturm-Liouville Boundary Value Problem
( Qatar University , 1993 , Article)The authors give the solutions of the eigenvalue equation that is associated with a modified Stum-Liouille problem. The discrete specturm and hence the resolvent will be obtained by means of different types of solutions ... -
Adsorptive Properties of a Desert Salsola Vermiculate Species from Synthetic Aqueous Solutions
( Qatar University , 2006 , Article)Pollution is becoming a major environmental problem and the current trend is to use available biomass to remove toxic substances from aqueous solutions. The preliminatry adsorption results on a natural Salsola Vermiculata ... -
Aeromagnetic Geophysical Investigation In El-Faiyum District, Western Desert, Egypt
( Qatar University , 1985 , Article)The present paper deals with the interpretation of the aeromagnetic survey executed over the Faiyum area. Western Desert, Egypt. Qualitative as well as quantitative interpretation of the aeromagnetic data were carried out ... -
Aeroradiometric and photogeologic characterizations Of the younger granites in the north eastern desert, Egypt and implications for mineral deposits
( Qatar University , 1995 , Article)Photogeologic studies of the younger granites in the North Eastern Desert of Egypt using both aerial photographs and satellite images revealed the separation of three successive phases of younger granites with different ... -
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 ... -
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 ... -
Algae Along Qatar Coasts Utilization And Future Prospects
( Qatar University , 1999 , Article)Most of marine algae have no equivalent on earth and therefore could be considered as irreplaceable sources of primary and secondary metabolites. This is especially the case for hydrocolloids from red and brown algae that ... -
Algal Nitrogen Fixation In The Northwestern Part Of The Arabian Gulf
( Qatar University , 1988 , Article)Nitrogen fixation and cell counts of blue-green algae and diatoms in the northwestern area of the Arabian Gulf were assayed during the (period, 7-20 November, 1984. Spatial variations indicated that the maximum rate of ... -
Algebraic Approach to Formal Microstructure Sheaves and Formal Quantum Sheaves Over Projective Schemes
( Qatar University , 2007 , Article)The I-adic non-commutative filtrations have crucial applications in the study of Lie algebras and the integral group rings. The I-completion R of a commutative ring R is considered a useful tool in algebraic geometry. Here ... -
An Algorithm for the Consturction of Admissible Tests of the Weibull Distrbution
( Qatar University , 1999 , Article)The method of H. Al-Rawwash and J. Marden [2] is used here for the construction of an admissible test which dominates a given inadmissible one for testing hyupothesis about the Weibull distribution. The algorithm and its ... -
Allelopathic Effect Of Glossonema Edule (Asclepiadaceae) On Associated Flowering Plants And Rhizosphere Fungi In Qatar
( Qatar University , 1994 , Article)Laboratory experiments were conducted to determine whether there were allelopathic effects of Glossonema edule (Asclepiadaceae) on six associated flowering plant species and three soil fungi. The tested species were the ... -
Aluminium Nitrate As External Absorbent In The Microdetermination Of Carbon And Hydrogen In Organofluorine Compounds
( Qatar University , 1994 , Article)Silica gel loaded with saturated A1(NO3)3- 10. H2O solution proved to be an efficient absorbent for the elimination of the interference of fluorine in the microdetermination of carbon and hydrogen in organofluorine compounds. ...
