Qatar University Science Journal - [From 1981 TO 2007]: Recent submissions
Now showing items 621-640 of 770
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Plant growth, metabolism and adaptation in relation to stress conditions XII. Carbohydrate and acid accumulation in phaseolus vulgaris and zea mays stressed with sodium sulphate
( Qatar University , 1990 , Article)Phaseolus vulgaris and Zea mays seedlings and plants were cultured on quarter-strength Hoagland nutrient medium with or without increasing concentrations of Na^SO^. Sodium sulphate increased the levels of reducing sugars ... -
Effect Of Lead Nitrate On The Liver Of The Developing Chick Embryos
( Qatar University , 1991 , Article)The liver of chick embryos treated with 0.03, 0.05 and 0.1 mg lead nitrate/egg showed disorganization of hepatic cords, abnormally enlarged blood sinusoids and extensive cell necrosis. The hepatocytes of lead-treated embryos ... -
On sexual dimorphism in the shrimp Palaemon pacificus (decapoda: palaemonidae) Collected from the red sea
( Qatar University , 1994 , Article)Palaemon pacificus is common in the Red Sea coast and the sexes are separate. Potential sexual dimorphism in 38 morphological parameters was investigated in a population of Palaemon pacificus collected from the Red Sea ... -
Biological effects of gamma radiation on stored product insects. 4 - radiation effects on sex pheromone production and perception by the rust-red flour beetle. Tribolium castaneum (herbst)
( Qatar University , 1985 , Article)Irradiation of the rust-red flour beetle, T. castaneum at different doses of gamma radiation considerably affected sex pheromone production by females and perception by males. The production of sex pheromone by virgin ... -
A Preliminary Check-List Of Benthic Mollusca On The Qatari Coasts, Arabian Gulf
( Qatar University , 1994 , Article)In this paper, an annotated checklist of the benthic marine Mollusca collected from Qatari coasts, Arabian Gulf, is presented. Localities and habitats are given for the common families of the recorded groups. Gastropoda ... -
Observations on some hydrochemical aspects of the United Arab Emirates waters along the Arabian Gulf and the Gulf of Oman.
( Qatar University , 1997 , Article)Surface and bottom water samples were collected from the United Arab Emirates waters along the Arabian Gulf and the Gulf of Oman during the period from October 1993 to September 1995. Samples were analyzed for temperature ... -
Developmental anatomy of the central nervous system of the cotton leaf worm, spodoptera littoralis boisd.
( Qatar University , 1983 , Article)The central nervous system, C. N. S., of the cotton leaf worm, Spodoptera littoralis (B.) develops from a median row of embryonic neuroblasts which divide repeatedly to form a double ganglionic chain. The two chains fuse ... -
Toxicity of Cobalt and Nickel to Fusarium Solani Isolated From Saudi Arabian Soil
( Qatar University , 1994 , Article)Fusarium solani isolated from Saudi Arabian soil was able to grow on liquid media containing up to 300 ug/ml cobalt or nickel. F. solani was tolerant to cobalt than nickel. The results provide evidence of the accumulation ... -
Constituents of plants growing in qatar x.* seasonal variations of the volatile oil of cymbopogon parkeri
( Qatar University , 1985 , Article)The seasonal variation of the volatile oil of Cymbopogon parkeri Stapf. was studied. The oil content is higher during the hot dry season than during the humid hot season and the cold season. No qualitative differences among ... -
Histological observations on the changes in Thyroid activity in the geckonid lizard, bunopus tuberculatus, during tail regeneration
( Qatar University , 1994 , Article)Histological observations on the thyroid activity during differentphases of tail regneration in the geckonid lizard, Bw/jo/ms tuberculatus, have indicated a decreased thyroid activity during wound-healing phase. During ... -
Sedimentological development of the upper pliocene- pleistocene sediments in the areas of el salamony and el sawamha sharq, North East Sohag , Egypt.
( Qatar University , 1995 , Article)The Upper Pliocene- pleistocene Nile sediments cropping out in the areas around El Salamony and El Sawamha Sharq constitute two terraces including five facies ; flood plain , talus and lacustrine facies in the upper terrace ... -
Preliminary Observations On The Relative Growth And Production Of Tilapia Species Cultured In Cages At Three Stocking Densities
( Qatar University , 1987 , Article)Relative growth rate and productivity of Tilapia species (T. nilotica and T. galilaea) were studied for fish reared in cages in the Serow fish farm, Egypt. Both species were reared under three different stocking densities ... -
Ecological Studies On The Bottom Fauna Of Lake Manala, Egypt
( Qatar University , 1990 , Article)An ecological survey has been conducted for the benthic Community in Lake Manzala during May and June, 1985. The diversity and distribution of organisms are largely determined by salinity. Mean abundance of benthic fauna ... -
Study of carbonate rocks of the khuff and Jubaila formations , saudi arabia by Thermal derivatography
( Qatar University , 1997 , Article)Thermal derivatographic analysis of the Khuff and Jubaila carbonate rocks shows that calcite and / or dolomite (of calcitic type) are the main constituent minerals. Their differential thermal and thermogravimetric behaviours ... -
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 ... -
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 ... -
Night and Early Morning Flying Insects in a Residence Backyard in Doha City, Qatar
( Qatar University , 2006 , Article)Night and early morning flying insects in Doha were recorded daily, for a complete year, using a light-water trap. Two peaks of insect numbers occurred in April-May and September-October periods respectively. The lowest ... -
Decomposition Of The Set Of Conditionally Exponential Convex Functions
( Qatar University , 1993 , Article)The theory of C* -algebra is used to develop a connection between the local extreme points and the topology of the spectrum space G. -
Treptodemus Latus and chauhnotrema spiniacetabulum (tirematoda: digenea); Hemirhamphidae, parasites of the fish, hemirhamphus marginatus from Qatari waters
( Qatar University , 2000 , Article)The fish Hemiramphus marginatus recently examined from Qatari waters was found to be infected with two species of degenetic trematodes: Treptodemus latus Manter, 1961 and Chauhanotrema spiniacetabulum Nahhas ans Sey, 1998. ... -
Conductance Measurements in Corrosion Studies of Aluminium
( Qatar University , 1994 , Article)A new method is suggested for studying the rates of dissolution of oxide film on aluminium and its alloys. The method is based on measuring the conductance between two aluminium (or its alloys) electrodes immersed in 3.0 ...
