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Abstract  

A method was developed for the preconcentration and separation of trace manganese from natural water samples by complexation with dithiocarbamate followed by adsorption onto C18-solid phase extraction column prior to irradiation. The Mn recovery was better than 99.8% without inteference from iron(III) at 5 mg.l-1, copper(II), zinc(II), aluminum(III) and cobalt(II) at 0.5 mg.l-1 and sodium(I), potassium(I), magnesium(II) and calcium(II) at 1 mg.l-1. The separation factor was 100 and the detection limit was 0.01 μg.l-1 with good precision and accuracy with a relative error lower than 3%. The method was applied to the determination of Mn in tap, well, river and treated water samples.

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Abstract  

Protease, an enzyme obtained fromPseudomanas aeruginosa, was radioiodinated using chloramine T method of (125I) iodide oxidation. The labelled product was purified using Sephadex G-50. The radiochemical yield reached 26.36% with a product specific activity 6.25 μCi/mg. Blood level curves, following intravenous injection of the labelled protease into mice, showed a biphasic blood level with a rapid initial declining phase; the characteristic of two-compartment open model. The rate constants K21, K12, and K10 were 0.05044, 0.006236, and 0.008264 min−1 respectively indicating a sharp decline in the serum concentration of the toxin, with a t1/2 of 83.85 min. The organ uptake of radioactivity follows the sequence liver>kidneys>lungs>heart>spleen>thyroid. A correlation between uptake and the incidence of tissue-hemorrhage is discussed.

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Abstract  

The method of proton particle-induced X-ray emission (proton PIXE) has been employed to study the trace element composition of human fingernails. The samples were colleted from 51 subjects randomly selected from a working community of about 500 adults and they were analyzed by the thick-target external beam technique of the PIXE method. The samples were exposed to the proton beam as 1-mm thick pellets and irradiated with 2 MeV protons having 20 nA beam intensity. For 40 C irradiations, the concentration of fourteen elements, K, Ca, Ti, Mn, Fe, Ni, Cu, Zn, As, Se, Br, Rb, Sr and Pb, were measured by comparison with a calibration obtained from the NBS orchard leaf standard (SRM 1571). Some anomalous cases have been revealed from this study and they are attributed to environmental factors. The frequency distributions of the elements are presented and the results compared with available data.

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Abstract  

The trace element composition of whole blood has been investigated in adult population in Bangladesh. The population was formed of one hundred individuals randomly selected from a working community of five hundred adults. The blood samples were freeze dried and analyzed using the external beam PIXE method. In this analysis, proton beams of 2 MeV energy and about 30 nA current were used for characteristic X-ray excitation. The concentration of eight elements, K, Ca, Fe, Cu, Zn, Br, Rb and Pb were determined by comparison with a calibration obtained from NBS orchard leaves. The frequency distributions of all the elements measured are presented and the results are compared with available data.

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Pollack Periodica
Authors:
Mohammed S. A. Khedr
,
Mona F. Ali
,
Abdullah M. A. Kamel
, and
Manal A. A. El-Ghanam

Abstract

This research will shed light on studying a terrazzo pavement in Prince Mohamed Ali Museum (the case study). The authors used visual inspection, stereo microscope, USB microscope, XRPD analysis, and SEM.EDX to identify its components, deterioration aspects and execution techniques. The XRPD and SEM.EDX results revealed that Portland cement was used in the three layers of terrazzo because of the detection of Hatrurite, Alite, Anorthite, Albite, Aragonite, etc. Many pigments were used in the topping terrazzo layer as; Goethite, Greenalite, Hematite, Azurite and Magnetite. The divider strips were made of brass alloy and the topping layer chips were prepared from basalt, marble and sea shells.

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