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السجلات المعروضة 231 -- 240 من 451
Lithofacies and depositional environments Of the lower jurassic sediments In central Saudi Arabia
(
Qatar University
, 1999 , Article)
The lithofacies, microfacies and sedimentary environments of the surface Lower. Jurassic sediments in central Saudi Arabia are studied. The Lower Jurassic is represented by the marine clastic Marrat Frormation which is ...
Origin And Tectonic Environment Of The Pan-African Rocks Of Abu El Tiyur Area, Eastern Desert, Egypt
(
Qatar University
, 1995 , Article)
The present paper deals with the geochemistry and origin of the Pan - African basement rocks, which covers about 825 km2 North of Abu El Tiyur area, in the Central Eastern Desert of Egypt.
The petrochemical character of ...
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 ...
Gc-ms analysis and antimicrobial activity of volatile oil of Pituranthos tortuosus (desf.)
(
Qatar University
, 1995 , Article)
Volatile oil of Pituranthos tortuosus (Desf.), family Umbelliferae was prepared in yield of (0.5%). GC-MS analysis of the oil resulted in identification of eight components. Dill apiole was the main constituent (94.76%). ...
Ecophysiology Of Desert Animals
(
Qatar University
, 1995 , Article)
The principal environmental problems that confront
both plants and animals in the desert are water shortage and
flooding, thermal extremes, and the absence of cover. Adaptational
responses to these include cryptobiosis, ...
Scanning Electron Microscopy Of The Egg And The Second Stage Larva Of Toxocara Vitulorum
(
Qatar University
, 1996 , Article)
The surface topography of the egg and 2nd stage larvae of the nematode Toxocara vitulorum are described by scanning electron microscopy. The eggs are oval and their surfaces are characterized by the presence of distinct ...
Ecophysiological Characteristics, Distribution, and Nutritional Value of Desert Range Plants in Qatar
(
Qatar University
, 1993 , Article)
Despite the scarcity of water, desert ranges of Qatar can support a characteristic diversity of species and an all-year-round supply of feed. A correlation between carbon dioxide fixation mechanism, distribution of species, ...
Weed Communities Of Date Palm In Eastern Arabia
(
Qatar University
, 1992 , Article)
The present study deals with the recognition and description of the weed communities of date palm plantations in Al-Hassa Oasis, . Eastern Arabia. Thirty three communities are recognized. They are classified, after the ...
Population Ecology of the Intertidal Sea Star Asterina Burtoni Gray (Asreroidea: Echinodermata) In the Wakrah Bay, South East Of Qatar
(
Qatar University
, 1995 , Article)
The abundance, distribution and population age structure of the sea star Asterina burtoni Gray were investigated in the intertidal area of the Wakrah Bay, South East Qatar Peninsula from October, 1993 to January, 1994. The ...
Effects Of Overfishing And Abandoning Bottom Trawling On Qatar's Fisheries
(
Qatar University
, 1996 , Article)
The present study was conducted to overview the effects of abandoning bottom trawling and increasing fishing effort on the structure and dynamics of Qatar's fisheries during 1985-1994, using the fishery statistics data, ...