Qatar University Science Journal - [From 1981 TO 2007]: Recent submissions
Now showing items 261-280 of 770
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ECG Abnormalities Induced By Scorpion Venom Administration: The Effect And The Mechanism
( Qatar University , 1994 , Article)Intramuscular administration of scorpion (Leiurus quinquestriatus) lyophilized venom (100, 200 and 400 mg/kg) into rats produced drastic changes in the electrical activity of the cardiac muscle. These abnormalities were ... -
Aluminium Nitrate As External Absorbent In The Microdetermination Of Carbon And Hydrogen In Organofluorine Compounds
( Qatar University , 1994 , Article)Silica gel loaded with saturated A1(NO3)3- 10. H2O solution proved to be an efficient absorbent for the elimination of the interference of fluorine in the microdetermination of carbon and hydrogen in organofluorine compounds. ... -
Nature Of The Aflatoxin B, - Induced Inhibition Of Photosynthesis In Chlorella Fusca (Chlorococcales, Chlorophyta)
( Qatar University , 1994 , Article)Treatment with Aflatoxin E^ (AFBi) resulted in inhibition of photosynthetic oxygen evolution in Chlorella fusca Shih.et Krauss. Treatments also induced a marked reduction of both chlorophyll and carotenoid contents. ... -
Algae Along Qatar Coasts Utilization And Future Prospects
( Qatar University , 1999 , Article)Most of marine algae have no equivalent on earth and therefore could be considered as irreplaceable sources of primary and secondary metabolites. This is especially the case for hydrocolloids from red and brown algae that ... -
Conditionally Exponential Convex Functions On Locally Compact Groups
( Qatar University , 1993 , Article)The main objectives of this study are: 1) The construction of a compact base for the convex cone of all conditionally exponential convex functions. The determination of the extreme parts of this cone. -
Copper Complexes Of Di-, Tri-, And Tetra-Peptides Containing Tryptophan, Histidine And Arginine
( Qatar University , 1983 , Article)Fifty Seven copper complexes of di-, tri-. and tetra-peptides containing tryptophan, histidine and arginine are studied spectrophotometrically. The ^a, and colour of the complexes are dependent on the sequence of the amino ... -
Contribution of the Fungal Flora and Mycotoxins of Some Canned Tomato Paste Samples
( Qatar University , 1994 , Article)Twenty-two species belonging to seven genera were isolated and identified from 21 tomato paste samples on glucose-Czapek's (5 genera and 14 species) and 10% NaCl-glucose-Czapek's (6 genera and 17 species) agar media, at ... -
Light Microscopic Study On Schistosoma Mansoni Induced Hepatic And Splenic Lesions Following Praziquantel Treatment
( Qatar University , 1989 , Article)Hepatic and splenic lesions were developed in mice of both sexes following their exposure to cercariae of Schistosoma mansoni (70 cercariae / animal). After 12 weeks of infection, the liver showed the formation of typical ... -
A Preliminary List Of The Insect Fauna Of Qatar
( Qatar University , 1985 , Article)The present paper give a preliminary account of the entomofauna of Qatar. It has a complex composition, the species are a heterogenous group with diverse distribution patterns. The account does not lay to completeness. ... -
Effect of Fertilizer Application on Diversity and Production of Weeds in Crop-Less Fields
( Qatar University , 1993 , Article)The present study aims at assessing the effect of fertilizer application (with monofactorial deficiency of nitrogen, phosphorus, potassium and lime) on the diversity and production of weeds in cultivated but crop-less ... -
Elliptic surfaces over a genus 1 curve with the pair (l3, l9) of singular fibers.
( Qatar University , 2000 , Article)In this paper we give a classication of all minimal elliptic surfaces (n : E —> C, g(c) = 1) with a section and exactly the pair (L, L)) of singular fibers. -
Studies on digenetic trematodes of some red sea fish 1. General survey
( Qatar University , 1983 , Article)812 Red Sea fish, belonging to 33 species, were examined for digenetic trematodes. All species of fish were infected with one or more genera of trematodes. Out of 812 fish, 394 (48.5%) were positive. The incidence of ... -
The In Vitro Genotoxic Activity Of Albendazole And Praziquantel, Singly And In Combination On Human Blood Lymphocytes
( Qatar University , 1996 , Article)Two anthelmintic drugs; Albendazole (ABZ) and Praziquantel (PZQ), applied individually or in combination, were tested at varying concentrations (5,10,20,40 and 100 ug/ml) for their ability to induce sister-chromatid exchanges ... -
Pyrrolizidine Alkaloids From Senecio Aegyptius L.
( Qatar University , 1988 , Article)Investigation of the alkaloidal constituents of Senecio aegyptius L. resulted in the isolation and identification of senecionine, dehydrosenkirkine and probably an isomer of seneciphylline. TLC, HPLC and GLC showed the ... -
Synthesis and Reactivity of Iron-Iridium Heterobimetallic Complexes Using Tridentate Phosphine Ligands
( Qatar University , 1994 , Article)Treatment of {Fe (CO)3 {(PPh2) 2 C=CH2}] with PPh2H gives the addition product [Fe (CO)3 {(PPh2) 2 CHCH2 PPh2}] (1). The uncoordinated phosphine group of complex 1 reacts with Ir4 (CO)12 to give mono-, di- and tri-substituted ... -
Floating capital pattern and biomass slope allocation method in the life history of calotropis procera (AIT.) AIT. F.
( Qatar University , 1992 , Article)Plants of the woody perennial Calotropis procera (Asclepediaceae) were grown from seed to seed-set in an open field. Smith's slope allocation and fractional-allocation or percentage methods were used to study dry matter ... -
Some Results Concerning Cobb - Voxman's Conjecture
( Qatar University , 2000 , Article)In this paper we shall give some partial results of the following conjecture raised in [3]: Suppose that X is a connected space with a dispersion point p and let f: X —> X be a nonconstant continuous function. Then f(p) = p. -
Helminth parasites of fishes from the arabian gulf 1. Preliminary general survey of fishes mainly from qatari waters
( Qatar University , 1986 , Article)The present work reports the results of a preliminary survey on the helminth parasites of some fish, caught mainly from Qatari waters in the Arabian Gulf. The incidence of helminth infections varied in various fish families, ... -
Analytical Studies Of Some Controlled And Noncontrolled Drugs Of Abuse (II)
( Qatar University , 1993 , Article)Benzodiazepines, barbiturates, amphetamines and some other non-controlled drugs were identified by GLC and HPLC then confirmed by GC-MS techniques. Comparative studies and discussions on the results obtained by GLC and ... -
Acid-Base Status Of Blood Of Varanus Griseus And Uromastyx Aegyptius
( Qatar University , 1984 , Article)1) A comparative study was carried out on the acid-base status of blood collected from five main blood vessels of two desert lizards, the monitor, Varanus griseus, and the dabb, Uromastyx aegyptius. 2) Blood of the monitor ...
