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  • Author or Editor: S. Garg x
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Abstract  

Gamma-radiolysis of KNO3 in the matrix of some sulfates, viz. Na2SO4, K2SO4, KNaSO4, KNaSO4: Eu, KNaSO4: Ce, K3Na(SO4)2, K3Na(SO4)2: Eu and K3Na(SO4)2: Ce has been studied at an absorbed dose of 30 kGy.G(NO 2 ) values calculated on the basis of electron fraction in all the sulfates are enhanced significantly. It is also affected by the nature of outer cation and the dopant lanthanide. Electron spin resonance (ESR) and thermoluminescence (TL) measurements show the formation of radical species SO 4 , SO 3 , O 3 , O 2 upon -irradiation. It is proposed that there radical species may transfer energy and interact with the radical species of nitrate (NO 3 2– , NO2, NO3 etc.) so as to enhance the decomposition. A possible mechanism has been proposed.

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Summary  

Radioanalytical techniques have been applied in a study on (subclinical) hepatitis in Dobermann dogs. Cu levels in transcutaneous obtained full liver biopsies were quantified using INAA and 66Cu. A copper excretion study was performed in a group of completely normal Dobermann dogs and in six Dobermanns with elevated copper levels and suffering from subclinical hepatitis. 64Cu2+ was used to assess whether a normal bile flow and thus excretion was possible. All subjects underwent separately from this 64Cu2+ excretion study a 99mTc-Bis-IDA scintigraphy. The Cu levels in liver of these hepatitis patients vary from 600 to 1600 mg . kg-1 whereas 100-300 mg . kg-1 is probably normal for healthy Dobermann dogs. These Cu levels match fully with histopathology results and clinical observations. Measurements during a 2 years' evaluation period showed a clear relation between the existence of subclinical hepatitis and increased Cu levels without a sign for cholestasis or an abnormal bile flow.

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The study was undertaken to increase the shelf-life of fruits of guava (Psidium guajava L. cultivar Banarsi Surkha). Uniform size and healthy fruits at green mature stage from winter season crop were exposed at atmospheric pressure to vapours of absolute ethanol and acetic acid for 2 h and hot water (vapour heat treatment) for 10 min. In the present investigation, only ethanol vapour treatment proved to be promising in enhancing the shelf-life of guava fruits, as other treatments showed phytotoxic effect. Ethanol treated fruits showed smaller weight loss and higher flesh firmness during storage. The activities of polygalacturonase, ß-galactosidase and cellulase were decreased by all the vapour treatments, however, ethanol was the most effective. It also reduced ethylene evolution and the contents of total soluble solids and ascorbic acid. All the vapour treatments could effectively decrease the mold colony forming units of surface microflora and eliminate coliforms. The results are discussed in relation to the mode of action of these vapours in delaying ripening of fruits.

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Chromium(III) complexes of the type Cr(A)(A′)2, Cr(A)2(A′) and Cr(A)3 have been prepared (whereA is either piperidyldithiocarbamate or morpholyldithiocarbamate andA′ is glycine or oxine or acetylacetone moiety). The mixed ligand complexes have been charac terized by elemental analyses, magnetic susceptibility measurements and thermal studies. The complexes show magnetic moment in the range of 3.5–4.3 B.M. which corresponds to three unpaired electrons. TG studies have also been carried out, in order to study the mode of decomposition of the complexes and to evaluate various kinetic parameters.

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