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Electrochemical behaviour of some pyrimidine derivatives: polarographic reduction of 1, 3-dimethyl-2, 4, 6(1h, 3h, 5h) pyrimidinetrione and its substituted 5-phenylazo
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Qatar University
, 1994 , Article)
The polarographic behaviour and spectrophotometric pKa of 1,3-dimethyl barbituric acid and 5-phenylazo substituted products were investigated in buffer solution of pH ~ 2-11. The results revealed an azo form of the substituted ...
Condition and trend of a depression-type habitat In rainfed desert rangelands of Qatar In response to fertilizer application
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Qatar University
, 1994 , Article)
Characteristics of a rainfed depression-type habitat in desert ranges, and its response to fertilizer application were studied. A single fertilizer application at a rate of 75 Kg ha1 prior to the rainy season improved range ...
Conductance Measurements in Corrosion Studies of Aluminium
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Qatar University
, 1994 , Article)
A new method is suggested for studying the rates of dissolution of oxide film on aluminium and its alloys. The method is based on measuring the conductance between two aluminium (or its alloys) electrodes immersed in 3.0 ...
Histological observations on the changes in Thyroid activity in the geckonid lizard, bunopus tuberculatus, during tail regeneration
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Qatar University
, 1994 , Article)
Histological observations on the thyroid activity during differentphases of tail regneration in the geckonid lizard, Bw/jo/ms tuberculatus, have indicated a decreased thyroid activity during wound-healing phase. During ...
Spectroscopy in Corrosion Studies of Copper
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Qatar University
, 1994 , Article)
Spectrophotometric measurements were used to study corrosion of copper in aqueous solutions containing the four following depolarizers: K2Cr2O-j, K2S2O8, Fe(NH4)(SC>4)2 and CCI3COOH. A silica cell was used for the corrosion ...
Biochemical studies on the relationship between hypothyroidism and/or some Rheumatic diseases
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Qatar University
, 1994 , Article)
Sixty seven patients were selected and divided into four groups according to their clinical condition covering normal controls, hypothyroid patients suffering from both hypothyroidism and rheumatic disorders and rheumatic ...
Stereochemistry of some high coordination compounds of dioxouranium(VI) With thiosemicarbazones
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Qatar University
, 1994 , Article)
The UO2 ion is peculiar in its coordination behaviour, because of its inherent capacity of forming compounds with higher coordination number. In the present work we describe the synthesis of a series of eight, nine and ten ...
Edaphic Gradients And Species Attributes Influencing Plant Distribution In Littoral Salt Marshes Of Qatar
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Qatar University
, 1994 , Article)
Edaphic gradients of moisture and salinity are critical environmental stresses that seriously influence littoral salt marsh flora, and determine the zonation of coastal vegetation. Shoreline communities subjected to severe ...
Population biology of sparid fishes in qatari waters 3. Reproductive cycle and fecundity of black-banded Seabream, mylio bifasciatus (forsskal)
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Qatar University
, 1994 , Article)
The reproductive cycle, gonads maturation, gonado-somatic indices (GSI) and fecundity of black-banded seabream Mylio bifasciatus from the Arabian Gulf waters off Qatar were investigated. Bi-weekly samples representing all ...
Pan African Basement Of Bir Safsaf Area East Sahara African Craton
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Qatar University
, 1994 , Article)
Bir Safsaf area occurs at the extreme southern part of the Western Desert of Egypt. It is covered by the Pan African Basement represented by the old continental gneisses and migmatites comprising granitic, granodioritic ...