Qatar University Science Journal - [From 1981 TO 2007]: Recent submissions
Now showing items 421-440 of 770
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Proline Accumulation In Plants Of Different Ecological Groups As A Response To Water Deficit
( Qatar University , 1985 , Article)The diurnal changes in proline content were investigated in different plants including a desert shrub (Retama raetam), a halophytic grass (Spombolus virgimcus) and a cultivated crop (Zea mays). Though these species have ... -
Analytical Studies Of Some Controlled And Noncontrolled Drugs Of Abuse
( Qatar University , 1991 , Article)Separation and identification of some depressants and stimulants by GLC, combined GC-MS and HPLC techniques was attempted. The results obtained are successful, valuable and may be applied in routine forensic analysis. -
Contribution To The Sedimentology Of The Bahariya Formation Of Gebel El-Dist, Bahariya Oasis, Western Desert, Egypt
( Qatar University , 1983 , Article)Combined microscopic, grain-size and heavy-mineral analyses were carried out on the Bahariya Formation at Gebel El-Dist (type section), Bahariya Oasis. These studies revealed that the formation is composed of moderately ... -
Urea Hydrolysis and Urease Activity in Saudi Arabian Soils
( Qatar University , 2000 , Article)Soil samples were collected from eight different localities m Saudi Arabia, and analysed for mechanical properties as well as for urea hydrolysis. The urease enzyme activity of these calcareous soils was also investigated. ... -
Primary Productivity of Lake Manzalah, Egypt, using C14 technique
( Qatar University , 1981 , Article)The hydrographical and chemical conditions of Lake Manzalah, Egypt, are influenced by the surging in of saline water from the Mediterranean sea and are by no means stable. The average of the parameters studied during the ... -
Helminth parasites of fishes from the arabian gulf 2 . the digenetic trematode genera Hamacreadium linton, 1910 and cainocreadium Nicoll, 1909
( Qatar University , 1986 , Article)The status of the related digenetic trematode genera Hamacreadium Linton 1910 and Cainocreadium Nicoll, 1909 is briefly reviewed. Hamacreadium Linton 1910 is described from Lutjanus fulviflamma and L. russelli. Cainocreadium ... -
Assessment of Coral Reef Communities At Abu-Dabab, North of Marsa Alam Egypt
( Qatar University , 2003 , Article)The coral reef communities in the area of Abu Dabab, north of Marsa Alam were assessed using rapid underwater technique. Three adjacent reefs were studied to reveal the actual status of the reefs and its damaged parts. ... -
Cleavability of Decomposition Spaces
( Qatar University , 2006 , Article)Assume that X and Y have the same homotopy type, if X (respectively Y) is cleavable over p, have proved that the decomposition space of Y/g (respectively X/f) is cleavable over p. A result ncerning Arhangel'skii - Teroni's ... -
Relation between Quasi-normed Ideals of Entropy Numbers and of Approximation Numbers
( Qatar University , 1981 , Article)Let en(T) and an(T) be the entropy numbers and approximation numbers of operator T between Banach spaces, respectively. Let ?p be the operator ideal defined by Sp:^TeL;{en(T)^lp}, and Sp be the operator ideal defined ... -
A Mathematical Model Of The Dynamics Of Schistosomiasis
( Qatar University , 1996 , Article)In this work the authors develop a mathematical model for the dynamics of a major helminth parasite of man, schistosomiasis. The model is a system of coupled non-linear equations. Numerical experimentations with the model ... -
Histochemical Studies On argas (Argas) Hermanni (Ixodoidea: Argasidae) Salivary Glands
( Qatar University , 1994 , Article)Basic proteins, tryptophan, tyrosine, free NH2 and SH groups, general carbohydrates, glycogen, acid mucopolysaccharides and lipids were investigated during nymphal and adult Argas (Argas) hermanni Audouin development. In ... -
Comparison of body mass, feeding and food conversion of temperature acclimatized Porcellionides pruinosus (Brandt, 1833) (Isopoda, Oniscidea) fed on the dry leaf of Punica granatum
( Qatar University , 2006 , Article)A detailed study was conducted on the body mass; moisture; assimilation efficiency; gross and net production efficiencies; feeding, assimilation; conversion and metabolic rates of the woodlouse Porcellionides pruinosus ... -
Phyllosphere and phylloplane fungi of some herbal plants belonging to Labiatae, Solanaceae and Umbelliferae in Egypt
( Qatar University , 1997 , Article)Survey on the occurrence of phyllosphere and phylloplane fungi on leaves surface of 15 different kinds of fresh herbs (three samples of each kind) belonging to three plant families (five kinds belonging to each of Labiatae, ... -
Direct Electrochemical Synthesis of Mono, Bi And Polynuclear Complexes of Some Hydrazide and Hydrazone Derivatives
( Qatar University , 2000 , Article)Transition metal complexes of mono-, di- and tetrahydrazides and their hydrazones have been prepared by electrochemical techniques using the metal as a sacrifical anode. The electrochemical oxidation of Co, Ni and Cu in ... -
Studies on the biology of eucalyptus micro theca f. Muell in the gezira, sudan i. The behaviour of the seed
( Qatar University , 1986 , Article)Eucalyptus microtheca has proved to be a success on the heavy clay soils of the Gezira. This tree species not only seeds regularly and prolifically during the summer, but also, though rarely, seeds during the winter. The ... -
Petrology, Mineralogy and Genesis ofWadi Dana Cambrian Manganese Deposit, Central Wadi Araba Region, Jordan
( Qatar University , 2001 , Article)Manganese oxides occurring at Wadi Dana (central Wadi Araba region, Jordan) are mainly hosted in the middle Cambrian dolomite limestone shale unit (DLSU). This deposit was investigated to elucidate their petrographic ... -
Microscopic Study Of The Rabbit Pancreas After Vagotomy
( Qatar University , 1997 , Article)The microscopic study of the morphological changes in the rabbit pancreas were investigated after vagotomy. Structural changes were observed in the pancreatic acinar cells and in the islets of langerhans two and three weeks ... -
A Class Of Functions Stronger Than M-Precontinuity, Preirresolute And A-Functions
( Qatar University , 1990 , Article)We propose a definition for a new class of functions that may be stronger than the previous types. Some of its characterizations, connections with known ones and the effect of them on some topological spaces are studied . -
A New Liquid Membrane Electrode For Selective Determination Of Caffeine
( Qatar University , 1984 , Article)A new liquid membrane electrode for caffeine prepared from a solution of caffeine-picrylsulfonate ion-pair complex in n-octanol is developed. It exhibits Nernstian response in the range of 10'2 to lO^M caffeine with a ... -
Single Cell Protein Production From Beet Pulp By Mixed Culture
( Qatar University , 1992 , Article)A mixed culture of Trichoderma reeseiand Kluyveromyces marxianuswas found to be more efficient for single cell protein (SCP) production (51%) from beet pulp (BP) than the other tested mixed cultures containing T. reeseior ...
