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السجلات المعروضة 21 -- 30 من 765
Geochemistry and Petrogenesis of a Late Proterozoic Volcanic Sequence in the Magal Gebriel Area, South Eastern Desert, Egypt
(
Qatar University
, 2000 , Article)
Metabasalts and meta-andesites together with small amounts of metadacite constitute the Magal Gebriel volanic suite. Restricted amounts of unmetamorphosed rhyolitic rocks are also present. The metavolcanics show a wide ...
Chemical Factors Affecting Growth and Development of Lateral Root Formation in Isolated Phaseolus vulgaris L.
(
Qatar University
, 2007 , Article)
The initiation and subsequent emergence of lateral roots as secondary roots have been examined in attached and excised roots of Phaseolus vulgaris grown in the absence or presence of indol-3-yl acetic acid (IAA). Treatments ...
Meiofaunal Life of Man-Made Wastewater Ponds in Qatar
(
Qatar University
, 2002 , Article)
The meiofaunal life of two wastewater ponds around Doha City was studied for the period October 2000-October 2001. The substrate nature of the two ponds was found to be similar in mean particle sizes but the densities of ...
The prevalence of attention deficit hyperactivity symptoms in schoolchildren in a highly consanguineous community
(
Karger
, 2008 , Article)
Objective: The objective of the present study was to find the prevalence of attention deficit hyperactivity (ADH) symptoms in a sample of primary schoolchildren in Qatar and investigate the behaviour of the children with ...
Using an outcome-based approach to assess computing programs
(
ACM New York, NY, USA
, 2007 , Poster)
In this poster, the author provides a pictorial demonstration of the elements associated with assessment and its relationship to the newly developed requirements by accrediting agencies in various countries. The presentation ...
Knockout mice: Is it just genetics? Effect of enriched housing on fibulin-4+/- mice
(
Public Library of Science
, 2007 , Article)
Background. Fibulin-4 is an extracellular matrix protein expressed by vascular smooth muscle cells that is essential for maintaining arterial integrity. Fibulin-4-/- mice die just before birth due to arterial hemorrhage, ...
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 ...
Investigation of Magnesium (II), Calcium (II) and Barium (II) Complexes in Aqueous Solution
(
Qatar University
, 2005 , Article)
The ionic association constants, K6, of Mg, Ca and Ba metal ions with succinate, malate and tartrate ligands were conduct metrically determined in water at 25-40°C. The conductometric data were analysed by the Shedlovsky ...
Influence of The Activated Qatari Attapulgite Clay Admixture on The Mechanical Properties and Hydration Kinetics of Ordinary Portland Cement
(
Qatar University
, 2001 , Article)
Blended cements are types of cements containing additives other than those used m Portland cement, which have considerable technological interest, because such addition increases the chemical resistance to sulfate and ...
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 ...