QU Ceased Journals: المرسلات الحديثة
السجلات المعروضة 1321 -- 1340 من 2240
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The Structures And Mode Of Formation Of Some Cyclodiphosphazane Derivatives With Urea And Thiourea
( Qatar University , 1986 , Article)The methods of preparation and possible reaction mechanisms for the formation of some geminal and nongeminal aminocyclodiphosph (v) azanes of the type (II - V) are discussed. These cyclodiphosphazanes obtained from the ... -
Separation of Two Forms of Extracellular p-glucosidase From a Thermotolerant Aspergillus niveus
( Qatar University , 2003 , Article)Two forms of P-glucosidase ((3-D-glucoside glucohydrolase, EC 3.2.1.21) from the culture filtrate of Aspergillus niveus were separated and partially purified by gel chromatography on Sephadex G-100 column. The two forms ... -
Pelagic Fish Resources And Their Fishery Around Qatar
( Qatar University , 1983 , Article)The existing pelagic fishery around Qatar is relatively smaller than the demersal fishery. Inshore and offshore gillnetting trolling and even bottom trawling, contribute to the production of pelagic fish species. About 30 ... -
Effect Of Temperature On Hyalomma (Hyalomma) Impeltatum Schulze And Schlottke (Ixodoidea: Ixodidae)
( Qatar University , 1988 , Article)The effect of 21, 25, 29 and 34°C on developmental period duration, weight of different stages in the life cycle and conversion efficiency in Hyalomma (H.) impeltatum Schuize and Schlottke was investigated at 75% relative ... -
Balanced Cross-Section Across The Southern Utah Overthrust Belt (Otb)
( Qatar University , 1995 , Article)Balanced cross-sections are offering the chance of better understanding of areas of complex geological structures that are insufficiently understood. Detailed field study and structural analysis by employing geometric ... -
Effects Of Chemical Pesticides On The Gravid Females And Stadia Of The Woodlouse, Porcellio Scaber (Latreille) (Isopoda, Oniscidea)
( Qatar University , 1991 , Article)Studies were made on the mortality rates of the gravid females, and on the survival and growth rates of the stadia of the woodlouse Porcellio scaber (Latreille) exposed for a period of 21 days to sub-lethal concentrations ... -
Appraisal into Phytochemistry and Taxonomy of an Old Plant Collection from The Middle East
( Qatar University , 1997 , Article)The English traveller Richard Pococke (1704 -1765) visited the Middle East during the period 1737-1740 and collected medicinal plants from localities in Egypt and Arabia. This collection gave a description of the Middle ... -
Attenuation Of Bacillus Cereus Spores By Different Factors
( Qatar University , 1993 , Article)The spore suspension of Bacillus cereus K] ]s was exposed to different concentrations of NaCl. NaNo3 and NaNC>2 as curing agents. The spores were able to tolerate 10% NaCl. Up to 4%, NaNC>3 had little or minor effects on ... -
The ultrastructure of some stages of haemogregarina Tarentannulari infecting the gecko Tarentola annularis
( Qatar University , 1995 , Article)Certain blood and schizogonic stages of Haemogregarina larentannulari - occuring in the vertebrate host Tarenlola annularis - were studied by electron microscopy. Certain crylhrocytic stages, as well as some schizogonic ... -
Inhibition of Aluminium Corrosion in Hydrochloric Acid
( Qatar University , 1993 , Article)The inhibitive effect of oximes, P-diketones and hydrazides, on the corrosion of aluminium in 2M HC1 has been investigated galvanostatically. The results suggest that, in presence of inhibitors, the anode is preferentially ... -
Prediction Intervals For Future Sample Mean From Inverse Gaussian Distribution
( Qatar University , 1991 , Article)A random sample Xi, Xz, ..., Xn from Inverse Gaussian distribution I(/x,X) is observed. On the basis of this observed sample a lOOp prediction interval of the mean Y of a future sample Yi, ..., Ym from I(^,^.) has been ... -
Coccoliths From Some Paleogene Rocks In The Gulf Of Suez Area, Egypt
( Qatar University , 1992 , Article)This paper describes and illustrates the calcareous nannoplankton (coccoliths) recorded in 240 samples collected from the Paleogene rocks in Wadi Belayim/Wadi Nukhul surface sections. Gulf of Suez area. Egypt. Thirty species ... -
Charge transfer complex formation constants of edta with methylviologen And its zwitterionic derivatives
( Qatar University , 1994 , Article)In the photochemical cycle of the labelled, tris (2,2'bipyridine) ruthenium(II), Ru(bpy)32+, the photo excited label is oxidized through electron transfer quenching by methylviologen (l,l'-dimethyl-4,4'-bipyridinium dication, ... -
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 ... -
Karyotype, Meiosis And Sperm Formation In The Land Snail Macrochlamys Indica
( Qatar University , 1994 , Article)Karyotype analysis, meiosis and sperm formation of the land snail Macrochlamys indica collected from different farms of ornamental plants in Doha city of the State of Qatar were investigated. The chromosome number is n=24 ... -
Ascending urinary tract infection in rats caused by Proteus mirabilis
( Qatar University , 1997 , Article)A model for ascending unobstructed urinary tract infection was developed in female rats to study the pathogenesis of urinary tract infection by Proteus mirabilis. Urinary bladders of rats were inoculated by I. V. cannula ... -
Nannobiostrat1graphy Of The Late Cretaceous Paleocene Succession In Esh El-Mallaha Range, Eastern Desert, Egypt
( Qatar University , 1990 , Article)This paper emphasis the biostratigraphic significance of thirty nannofossil species recorded from the Maestrichtian - Paleocene succession in Esh El-Mellaha Range, Eastern Desert, Egypt. These species participated in making ... -
Mycoflora And Natural Occurrence Of Mycotoxins Of Chicken Stock
( Qatar University , 1993 , Article)Twenty four species and one species variety (belonging to 11 genera) and 20 species with the addition of two species varieties (belonging to 7 genera) were isolated on glucose-Czapek's agar and glucose-Czapek's agar medium ... -
Strain Broadening of E.P.R. Linewidths in Fe/Mgo Single Crystals and Powders
( Qatar University , 2004 , Article)The E.P.R. linewidth of the M= + 1/2 <-» -1/2 transition of Fe3+ spectrum of Fe/MgO single crystals and powders have been measured at 9 GHz before and after annealing. The nominal iron concentrations ranged from 310 to ... -
A Markov Chain Model For River Flow
( Qatar University , 1996 , Article)This paper is concerned with a trinary transformation of river flow. The transformed flow is modeled as a three-states Markov chain and both upcrossing and downcrossing problems are studied simultaneously. The stationary ...
