Qatar University Science Journal - [From 1981 TO 2007]: المرسلات الحديثة
السجلات المعروضة 721 -- 740 من 770
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Changes in Soluble Sugars and Proline in Seedlings of A local Wheat Cultivar (Doha) Due to the Salt Stress and Temperature
( Qatar University , 2006 , Article)Germination of grains, and changes in the soluble sugars and proline due to salt stress under three temperatures in the germinating grains, of the local wheat cultivar (Doha) were studied. This cultivar proved resistant ... -
The P-Center And The P-Median Problems In Graphs With Small Number ' Of Spanning Trees
( Qatar University , 1996 , Article)In this paper, we will describe some algorithms and give their complexity as following: (1) The algorithm for finding a dominating set of radius r in a vertex-weighted graph with small number of spanning tress. The ... -
Metabolic Effects Of Cyproterone Acetate And Corticosterone In The Chicken Callus Domesticus
( Qatar University , 1990 , Article)The metabolic effects of corticosterone were compared with those of cyproterone acetate , a steroidogenic inhibitor with suggested corticoid-like effects. Corticosterone significantly increased serum levels of ... -
Comparative Development Studies On The Lateral Canal System In Cyprinus Carpio And Gambusia Affinis Affinis
( Qatar University , 1990 , Article)The lateral line canals and the neuromasts situated inside their lumina are described in two fishes differing in their feeding habits. There are 20 canal neuromasts in the bottom feeder Cyprinus carpio, while in the surface ... -
Photocatalytic treatment of industrial wastewater
( Qatar University , 1997 , Article)A novel Plexiglas double-skin sheet reactor ( DSSR ) able to use diffuse as well as direct sunlight for the detoxification of industrial wastewater was used. The efficiency of the photocatalytic treatment of a highly ... -
The Effect of Cutting Height on Forage Yield and Performance of Alfalfa Cultivars
( Qatar University , 1999 , Article)Six exotic alfalfa (Medicago sativa L.) cultivars were evaluated for their forage yield performance and persistency under different cuttings heights during 1991/1992 in UAE. Cultivars revealed a highly significant difference ... -
Functions Near Of Na-Continuity
( Qatar University , 1989 , Article)In 1986, the concept of Na-continuity was initiated by Chae et al., this leads us to introduce two classes of functions, namely strongly Na-continuity and weakly Na-continuity. We characterize these new types. Several ... -
Krein's Method For Singular Mixed Problems
( Qatar University , 1993 , Article)In this paper, the spectral relations of the Fredholm integral equation of the first kind for the mixed problems with singular kernel are obtained. -
Pollen Morphology Of The Family Boraginaceae In Qatar
( Qatar University , 1995 , Article)The pollen morphology of six species belonging to six genera of Boraginaceae in Qatar have been investigated by LM and SEM. The examined species proved to be eurypalynous, having different morphological types and can be ... -
Biochemical composition of the copepod euterpina acutifrons from the Coastal waters of alexandria
( Qatar University , 1994 , Article)Protein, carbohydrate and lipid contents were determined in the most numerous and wide spread copepod Euterpina acutifrons collected from the coastal waters of Alexandria. Protein is the major biochemical component of the ... -
A Note On Pre-J-Group Rings
( Qatar University , 1991 , Article)Given an associative ring R satisfying a°'b = Ba" for any pair a and b of its elements, is being a positive integer, and a group G satisfying x""' = y"~1, we give a sufficient and necessary condition on the group ring GR ... -
Analytical Studies Of Some Controlled And Noncontrolled Drugs Of Abuse (II)
( Qatar University , 1993 , Article)Benzodiazepines, barbiturates, amphetamines and some other non-controlled drugs were identified by GLC and HPLC then confirmed by GC-MS techniques. Comparative studies and discussions on the results obtained by GLC and ... -
SOIL FUNGI ARE AN ACTIVE PARTNER OF OUR ECOSYSTEM. THEIR BIODIVERSITY AND ACTIVITIES SHOULD BE APPRECIATED*
( Qatar University , 1995 , Article)Soil fungi play an active role in the maintenance and functioning of ecosystems around man. This paper is an appreciation of their bio¬diversity and activities at the global and Arab world levels. Microorganisms merit ... -
Geochemical studies using trace elements analysis of source rocks and related crude oil in the Gulf of Suez, Egypt
( Qatar University , 1997 , Article)The occurrence and distribution of trace elements in source rocks and crude oils is used to asses the process of geochemical exploration. Rock and crude oil samples representing the giant fields of the Gulf os Suez province ... -
A Study Of Atmospheric Transparency Over Qena In Upper Egypt
( Qatar University , 1995 , Article)Atmospheric transparency over Qena/Egypt has been studied for direct solar radiation values . which were calculated from global and diffuse solar radiation measurements . The mean monthly of the instantaneously transparency ... -
Geoelectrical Study On The Area West Of Aswan Town, Egypt
( Qatar University , 1992 , Article)A geoelectrical resistivity survey on the area west of Aswan has been conducted in order to investigate its prevailing hydrogeological and subsurface geological conditions. The study demonstrates the occurrence of a probably ... -
Lower Eocene Black Shale Beds Of Rus Formation In North Of Oman-Possible Oil Shales
( Qatar University , 1994 , Article)A suite of samples from some black shale beds of lower Eocene Rus Formation from north of Oman have been investigated through detailed geochemical analyses. The obtained results indicate that these shale beds contain a ... -
Iodometric microdetermination of phosphorus in organic compounds by use of An amplification reaction
( Qatar University , 1994 , Article)A high chemical amplification method is described for the iodometric microdetermination of phosphorus in organic compounds. This method depends on combustion by the oxygen flask, absorption of the combustion products in ... -
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 ... -
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, ...
