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السجلات المعروضة 131 -- 140 من 205
Effects Of Gamma Radiation On The Sexual Attraction Of The Mediterranean Fruit Fly. Ceratitis Capitata Wied
(
Qatar University
, 1987 , Article)
The Mediterranean fruit (ly, Ceratitis capitata Weid, was gamma irradiated as full grown pupae with 50, 70 and 90 gray. The produced adults were examined for their attractiveness to the non irradiated (normal) other sex. ...
Formation Parameters Of The Lower Eocene Rocks In Qatar
(
Qatar University
, 1986 , Article)
The study of some carbonate rock samples collected from four different locations in Qatar and attributed to the Rus Formation (Lower Eocene) reveals that these rocks are mainly heterogeneous in their petrophysical ...
On Using the One-Exposure Method for Stress Measurements by X-Rays in Technology and Scientific Research
(
Qatar University
, 1982 , Article)
The paper discusses the connection between macroscopic internal stresses and the technological character of technical materials. The basic theoretical relations which are used with X-Ray tensiometry of macroscopic internal ...
Some Aspects Of Camouflage In Animals
(
Qatar University
, 1989 , Article)
Camouflage is the principal device by which vulnerable animals escape predation. The attention of potential predators can be avoided by protective resemblance -mimicking an inedible object such as a seed or leaf. Concealment ...
Synthesis And Biological Activity Of Some New 4-(Aminoacyl) Aminopyridines And 2-(Aminoacyl) Aminopyrimidine Derivatives
(
Qatar University
, 1983 , Article)
The synthesis of 4-(N-Tos and N-Pht-aminoacyI) aminopyridines (III - XIV) and 2-(N-Pht-aminoacyl)-aminopyriniidines (XV-XXIV) has been achieved employing the acid chloride and carbodiimide methods. Hydrazinolysis of ...
Mechanism of Dehydration of Ethanol over Alumina
(
Qatar University
, 1981 , Article)
The dehydration reaction of ethanol to ether and ethylene was kinetically investigated in a flow system using •y-alumina. Pyridine was found to inhibit the formation of ethylene and ether. The rate of ethylene formation ...
Plant growth, metabolism and adaptation in relation to stress conditions v. Effects of salinity on the fatty acids of germinating flax, cotton and castor bean seeds
(
Qatar University
, 1987 , Article)
The same three fatty acids were detected in flax, cotton and castor bean seeds:
myristic, plamitic and oleic. In addition, linoleic was found in flax and lauric and stearic in castor bean. The seeds were germinated over ...
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 ...
Petrogenesis And Geochronology Of The Granitic Intrusions Of Gabal Kulyiet And Seiga, South Eastern Desert, Egypt
(
Qatar University
, 1986 , Article)
In the South Eastern Desert of Egypt tonalite. granodiorite and granite intruded intermediate to acidic metavolcanics and volcanogenic metasedimentary rocks of Precambrian age. The geological features of these granitic ...
Vibrational Analysis Of TaBr5
(
Qatar University
, 1987 , Article)
Vibrational analysis for TaBr5 is achieved on the basis of D3h symmetry and employing GF matrix method. Each vibration is quantitatively assigned according to the calculated values of the potential energy distributions. ...