Browsing Qatar University Science Journal - [From 1981 TO 2007] by Title
Now showing items 251-270 of 770
-
Facile synthesis of several new pyridine and fused pyridine derivatives with Anticipated biological activity
( Qatar University , 1994 , Article)The reactions of benzothiazol-2-N-acetylacetohydrazide 1 with a, (}-unsaturated aldehyde, ketone, ester or diketoester led to the formation of the titled ring systems. The same target was also achieved through the reactions ... -
Factor analysis of integrated radiometric data as an aid In geological mapping of gebel eneigi area South Eastern Desert, Egypt
( Qatar University , 1994 , Article)Factor analysis technique was applied to airborne gamma-ray spectrometric data of Gebel Eneigi Area, South Eastern Desert of Egypt where the concentration maps of U, Th, K and their ratios besides the Tc (total count map) ... -
Factors Governing Mosquito Susceptibility To Bacillus Sphaericus Strains
( Qatar University , 1992 , Article)Three lyophilized strains of Bacillus sphaericus (1593-4, 2297 and SSII) were tested against four different mosquito species. Culex pipiens larvae demonstrated the highest level of susceptibility towards the 3 B. sphaericus ... -
A Family Of Nonramified Functions, Defined In Zz<1
( Qatar University , 1983 , Article)In this article a family of nonramified functtions, defined in zz<l, is obtained. It is characterized by an achieved distortion theorem; its Bloch constant and the limit of convexity are determined. Peschl's principle is. ... -
Fatty acid composition of sargassum denticulatua1and s. Latifouum as influenced by the time of collection and the plant organ
( Qatar University , 1995 , Article)Fatty acid profile of two species of Sargassum namely, 5. denticulatium (Forsk). Borgesen and S. latifolium (Turn) Ag., from the Red Sea coast of Egypt was studied. Fatty acid data indicate that there is a strong seasonal ... -
Fe57 Mossbauer Study In Cobalt Substituted Magnetite
( Qatar University , 1983 , Article)The Mossbauer effect has been studied in the mixed ferrites CoxFe3_x04 (for x = 0.8, 0.9 and 1) with the spinel structure in the temperature range between 78 and 830K. The composition with x = 1, showed an expected Zeeman ... -
The fecundity of gerres oyena forskal 1775, ( fam. Gerreidae) in the qatari waters of the arabian gulf
( Qatar University , 1986 , Article)Fecundity estimates were made on a total of 180 mature fish Genes oyena Forskal of different lengths and weights, collected during the early spring of 1985. Log-log relationships were estimated between fecundity (either ... -
Feeding Behaviour and Food Selection of Dhab Uromastyx microlepis From Wild Vegetation
( Qatar University , 2001 , Article)The present study deals with the food selection and feeding behaviour of Uromastyx microlepis 'dhab' spiny tailed lizard during a period of one complete year inhabiting AL-Gassim desert area. Climatically the area can be ... -
Ferricretes of the Early Tertiary Dammam Formation in the Dukhan Area, Western Qatar: mineralogy, geochemistry, and environment of deposition
( Qatar University , 2003 , Article)Ferricretes of the Middle Eocene Dammam Formation, Western Qatar, were investigated using petrographic and ore microscopy, IR TGA, XRD, and geochemical analyses. The ferricretes mainly consist of goethite, which is very ... -
Filtered Dehomogenization Theory For The Micro-structure sheves OY
( Qatar University , 1999 , Article)In this work we study the theory of dehomogenization at the level of filtered sheaves using the micro-structure sheaves. For the sheaf of quantum section the results are still true. -
The First Record of Philometra lateolabracis Yamaguti, 1935 (Nematoda: Spirurida; Philometridae) from teleost fishes of the Arabian Gulf
( Qatar University , 1999 , Article)Philometra lateolabracis Yamaguti, 1935 was collected from the ovaries of Liza macrolepis (Mugilidae), Epinephelus tauvina (Serranidae), E. areolatus (Serranidae), Trichiurus haumela (Trichiuridae), Psettodes erumei ... -
Fish diversity in correlation with some environmental factors in the mangal of two protectorate areas, ras muhammed and nabq on the red sea in egypt.
( Qatar University , 1997 , Article)The present investigation is an attempt to study the fish diversity at five sites of the mangrove forests (Mangal) in two famous protectorate areas : Ras Muhammed and Nabq on the Red Sea in Egypt. The present investigation ... -
Fixed Point Theorems in Topological Spaces
( Qatar University , 2000 , Article)A couple of theorems for a pair of self-maps on a topological space have been obtained using which certain fixed point theorems in the literature for pairs of maps satisfying contractive type conditions have been deduced. In ... -
Flavonoids From Cressa Cretica
( Qatar University , 2005 , Article)The aerial parts of Cressa cretica L. yielded five flavonoids that were identified as quercetin (1), quercetin-3-B-O-D-glucoside (2), kaempferol-3-O-B-D-glucoside (3), kaempferol-3-O-a-L-rhamno-(1—+6)- B-D-glucoside (a) ... -
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 ... -
The Flora of The State of Qatar: Its History and Present-Day Status
( Qatar University , 2005 , Article)The history of botanical exploration in the State of Qatar is of recent origin. Various collections culminated in 2 major Floras for the State of Qatar in 1981 and 1983. Since then, further collections and focus on several ... -
Fluometuron Induced Growth, Chemical And Photosynthetic Changes In Chlorella Vulgaris
( Qatar University , 1988 , Article)Presence of fluometuron at different concentrations in the culture medium of Chlorella vulgaris induced pronounced inhibition in the growth rate and dry weight of the alga throughout the experimental period. Furthermore, ... -
Foraminifera And Age Of The Araej Formation In The Dukhan Oil Field, Western Qatar Arabian Gulf
( Qatar University , 1992 , Article)The detailed examination of the three members of the Araej Formation (lower Araej, Uwainat and upper Araej) in four wells, in the Dukhan Field, led to the identification of 36 foraminiferal species. Of these, 29 species ... -
Forecasting Of The Storm Surge In Winter At Alexandria (Egypt)
( Qatar University , 1992 , Article)Since storms frequently occur in the winter season, at Alexandria, SE of the Mediterranean Sea. storm surges often affect this area. In this paper, we attempt to forecast the storm surge heights in the commercial Western ... -
Formation of Usual and Bridging Complexes using organoselenium and -Tellurium compounds
( Qatar University , 2005 , Article)The reactions of l,3-benzoselenadiazole with some diiodo selenium and tellurium heterocyclic compounds have led to the formation of charge transfer complexes. From the same reactions but in the presence of I9PtC14 new types ...