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  • Author or Editor: J. Chatterjee x
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Abstract  

A radiochemical solvent extraction method for the determination of iron(III) employing the chelating extractant malonic anilide (MA), synthesized in our laboratory, has been described. Effects of different parameters on the extraction of iron(III) from 2M hydrochloric acid into a mixed organic solvent (methyl isobutyl ketone (TIBK) and diethyl ether) have been studied in detail. The method was applied for the estimation of iron content in several fruits using the principle of substoiciometric isotope dilution analysis.

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Abstract  

Two single doses of X-ray radiation, i.e., 75 cGy and 4.0 Gy were applied on male Swiss albino mice. Quantitative changes in concentrations of trace metals like copper, zinc, cadmium and chromium in the whole body irradiated mice skin at several post-irradiated time intervals were studied in comparison to that of control animals. Observations indicate that irradiation induce redistribution of trace metals studied in skin at different post-irradiation time intervals.

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Siderophores are low molecular weight (<1000 D) iron chelating compounds produced by microorganisms. Production of siderophore is a device of antagonism as by virtue of the capacity of siderophore production, a microorganism competes for Fe (III) with the others. Production of siderophores by 9 different soil fungi and wood-decay fungi was studied following CAS - assay and CAS - agar plate assay. Optimization for the production of siderophores was done by varying the levels of pH and Fe (III) concentrations in the low nutrient medium. All the test fungi could produce siderophores, though the degree of production recorded to be very low both in Botryodiplodia theobromae and in Fusarium spp. On the other hand, all the species of Trichoderma showed their excellency in siderophore production. The optimum pH for production of siderophores remained at neutral pH level though the range varied from pH 6.0-8.0. The optimum range of the concentration of Fe (III) required for siderophore production was recorded to be 1.5-21.0 µM. However, the stress condition of iron might be a decisive factor for siderophore production.

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Abstract  

Radish plant was collected along with root and soil from the nearby area of a Municipal Solid Waste dumping site of the metropolitan city of Kolkata, West Bengal, India and analyzed for a wide range of elements using the EDXRF technique with a 109Cd point source and a Si(Li) detector. The samples comprized of the root-soil, root and leaves. For quality control purposes, NIST standard reference material (SRM) 1648 Urban Particulate Matter had also been analyzed using the same procedure as for the samples. Concentrations of elements with X-ray energies in the range of 3–20 keV in the soil around the root and their uptake pattern by the root and the leaves have been estimated.

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