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Now showing items 31-40 of 114
Genotoxicity and Embryotoxicity of the Insecticide Primicid in Chick Embryo
(
Qatar University
, 2000 , Article)
Growing chick embryos were treated with primicid to examine the cytogenetic and embryotoxic effects of this insecticide. For the cytogenetic assay, eggs were injected through the air chamber with primicid at a concentration ...
The effect of two substituents on different organoselenides and tellurides to form new charge-transfer complexes
(
Qatar University
, 2004 , Article)
Different organotellurides and selenides were prepared as electron donors and reacted with p-Benzoquinone (p-BQ) and m-Dinitrobenzene (m-DNB) as electron acceptors .
The resulted molecules were considered as new ...
Lumping Processes of Periodic ARMA Processes
(
Qatar University
, 2004 , Article)
In this article various lumping processes are defined for periodic ARMA (PARMA) processes, namely, the forward, the backward and the cyclic lumping processes. The inter-relations between the parameters of these lumping ...
Elliptic surfaces over a genus 1 curve with exactly the pair (I8, IV) of singular fibers
(
Qatar University
, 2000 , Article)
In this paper we classify all minimal elliptic surfaces (TI : E —> C) over a genus 1 curve C, with a section and exactly the pair (Is, IV) of singular fibers.
Cloning and Expression of Methionine-enriched Glycinin GY4-Genes in E. Coli
(
Qatar University
, 2002 , Article)
Cloned cDNAs encoding glycinin subunit GY4 was modified to increase methionine content. The effect of the modification was evaluated using an in vitro transcription / translation system. The modifications were carried out ...
Possible Ionic Effects of NaCl on Two Mexican Wheat Cultivars
(
Qatar University
, 2005 , Article)
The effect of NaCl on growth and physiology of two Mexican wheat (Triticum asestivum L) cultivars (Cajeme: salt tolerant, and Yecora: salt sensitive) was compared with that of other osmotic agents, Na2SOa (ionic compound) ...
Volatile Components of the Phaeophyceae Hormophysa cuneiformis Growing Along Qatar Coasts
(
Qatar University
, 2007 , Article)
The present work deals with the study on volatile compounds from the brown alga Hormophysa cuneiformis collected from the Northwest coast of Qatar on May 2002. Two extraction methods have been used: conventional hydrodistillation ...
Oxidative Addition Reactions of Sn(II) And Pb(II) with Some Hydrazide And Hydrazone
(
Qatar University
, 2000 , Article)
Bivalent tin compounds can be easily transformed to tetravalent compounds by oxidizing agents. The use of ortho-quinones for oxidation of transition metals has been the subject of many publications, but few analogous studies ...
Analysis of Gravity Measurements along Some Profiles On-Shore, Of Qatar Peninsula
(
Qatar University
, 2000 , Article)
A gravity study on the Qatar Peninsula was conducted to leam about density contrasts in this region and to gain information about subsurface geological structures favourable for oil and gas reserves. We recorded high quality ...
Tectonic Setting and Petrogenetic Evolution of Wadi Erier Rocks, South Eastern Desert, Egypt
(
Qatar University
, 2003 , Article)
A combination of geologic, petrographic and chemical criteria is used to classify the Erier basement rocks into three suites namely, the metagabbro-diorite (MGD) suite, the tonalite-granodiorite (TG) suite and the ...