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The Neurosecretory Cells and Neurosecretions in the Developmental Stages of the Cotton Leafworm -Spodoptera Littoralis (B)
(
Qatar University
, 1981 , Article)
In 1955 Nayar described two types of neurosecretory cells in lphita limbata (A- and B-types) [1]. Later, Johannson [2] classified these cells into four categories: A, B, C and D, which he regarded as motor neurones of ...
Dehydration of Ethanol over HF-treated Al2 O3 using the GC-column as Chemical Reactor
(
Qatar University
, 1981 , Article)
The effect of treating •y-alumina with hydrofluoric acid on the dehydration reaction of ethanol was investigated at 325°C. The gas chromatographic column was used as a chemical reactor. The rate of formation of ethylene ...
Translation - invariant Positive-definite Generalized Kernels of Infinite Number of Variables
(
Qatar University
, 1981 , Article)
In the theory of spectral analysis of positive-definite j<.ernels, there exist well-developed
methods based on the ideas of Krein connected with the construction of a Hilbert space
by means of a kernel [ 1, 11]. In the ...
Mossbauer Effect Study of Libyan Desert Silica Glass
(
Qatar University
, 1981 , Article)
The Mossbauer effect and X-ray fluorescence techniques are applied to study the Libyan Desert Silica Glass. The X-ray flourescence proved the existence of 13 elements in each sample of five glass types with differences in ...
Synthesis and biological activity of some new 3-and 6-substituted coumarin amino acid derivatives. Part I
(
Wiley-Blackwell
, 1981 , Article)
The synthesis of 6-nitrocouarrain-3-CO-amino acids and their corresponding methyl esters (II-XVII) and some dipeptide methyl esters (XVIII-XXVI) are described. 6-(N-Tosyl- or N-phthalylaminoacyl)aminocoumarin-3-carboxylic ...
On the Propagation of Elastic-plastic Wave in the Half Space
(
Qatar University
, 1981 , Article)
The problem of the propagation of the elastic-plastic wave in the half-space occupied by and elastic-plastic medium has been studied. Treatments were carried out under the Assumption of perpendicular load, on the boundary, ...
p,q Ideal of Operators in Banach Spaces
(
Qatar University
, 1981 , Article)
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 ...
Some aspects of petro-urbanism in the Arab Gulf States
(
Qatar University
, 1981 , Article)
All joy o' the worm: The Ironic Tragedy of Antony and Cleopatra
(
Qatar University
, 1981 , Article)