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Now showing items 1261-1270 of 1471
The influence of oxygen, partial vacuum, temperature, relative humidity combined with gamma radiation on the mosquito, Culex pipiens complex l. I. Effect of exposure to temperature and relative humidity alone.
(
Qatar University
, 1993 , Article)
The results revealed that a temperature of 10°C was the most effective temperature on pupal mortality of Culex pipiens complex L. followed by 32°C then 20 and 26°C. There was a gradual increase in pupal mortality with ...
Synthesis of some new oximes, thiocarbamates, pyrazolyloxy, isoxazolyloxy, Pyrmidyloxy and pyridyloxy quinolines
(
Qatar University
, 1994 , Article)
The reaction of 1 or its corresponding chalcones 3a-c with hydroxylamine in boiling pyridine gave the oximes 2 or 5a-c respectively in almost quantitative yield. When both 2 and 5a-c were reacted with phenylisothiocyanate, ...
Synthesis, spectroscopic and thermal properties of some ionic polymers and polymeric complexes derived from phthaloyl bis (s-methylhydrazinecarbodithioate).
(
Qatar University
, 1990 , Article)
Mono- and bis hydrzides derived from the condensation of S-methylhyd-razinecabodithioate with benzoylchloride and tere- and iso-phthaloydichloride, respectively, were prepared. Their reactions with secondary ...
Global And Ultravoilet Radiation Over Kuwait
(
Qatar University
, 1999 , Article)
The data of six spectral bands of solar radiation over Kuwait were measured locally, during the period of time starting May 1, 1995 until February 5,1998.
Near ultraviolet spectral band (315-380) nm, shows very week ...
Modern and Ancient Sabkha Environments -Boron Isotopes as Discriminators of Facies and Uses in Base Metal Exploration
(
Qatar University
, 1999 , Article)
Boron isotopic analyses were performed on samples of stromatolite representative of intertidal conditions within modem and Early Proterozoic sabkhas. The intertidal zone at Al-Khiran in southern Kuwait shows a range of 5^ ...
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 ...
Mineralogical and Geochemical Compositions of Modern Bivalve Shells from The Mediterranean Coast Of Egypt
(
Qatar University
, 1993 , Article)
The stable isotopic (8 ^C and 8^O) and elemental (Sr and Mg) compositions are presented for marine mollusc Carditacea and Solenacea shells collected off the Mediterranean coast of Egypt. Based on shell microstructures and ...
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. ...
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.