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Your search keyword '"Ahmed, S. M."' showing total 20 results
Start Over Author "Ahmed, S. M." Publication Year Range More than 50 years ago
20 results on '"Ahmed, S. M."'

9. Studies on granular formulations of Bacillus thuringiensis berliner.

Author

Ahmed, S. M., Nagamma, M. V., and Majumder, S. K.

Abstract

Survival of the spores of Bacillus thuringiensis in granular formulations has been tested under storage conditions in the laboratory and also outdoor conditions exposed to weather. The granular formulations were prepared with attapulgite and aqueous and non-aqueous carriers. The virulence of the spore formulation was tested on Bombyx mori larvae. A 0.4% spore concentration, with an initial count of 64 × 106, gave ultimately 0.3 to 0.4 × 106 viable spores/g of the granule after 248 days of storage in the room. The viable count of spores in the granules exposed to outdoor weather conditions fell rapidly within two days; at the end of 65 days, it was maintained at between 3 × 104 and 12 × 104/g of the granules. Optimum concentrations required in granules for 100% mortality of the test insect was found to be 0.4 × 106 spores/g, at the rate of 50 mg of granules per 85 cm2 of leaf surface. The granular formulation of B. thuringiensis was found to be more virulent than 'Thuricide' formulation on B. mori larva. [ABSTRACT FROM AUTHOR]

Published
1973
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17. A simple chromatographic method for determining the basic amino-acids in protein hydrolysates

Author

Nagi N. Messiha and Ahmed S. M. Selim

Subjects
chemistry.chemical_classification, Chromatography, Aqueous solution, Protein Hydrolysates, Ethyl acetate, food and beverages, Biochemistry, Decomposition, Hydrolysate, Analytical Chemistry, Amino acid, chemistry.chemical_compound, Adsorption, chemistry, Electrochemistry, Environmental Chemistry, Organic chemistry, Imidazole, Amino Acids, Spectroscopy, Histidine
Abstract

A new micro method utilising charcoal chromatography has been developed for the determination of the individual basic amino-acids in protein hydrolysates. It is based on the fact that both the aromatic amino-acids and basic amino-acid picrates are strongly adsorbed by active-charcoal columns, and that the latter can be freed from the aromatic amino-acids by treatment of the adsorbent with aqueous ethyl acetate solution. The separation of the individual basic amino-acids depends on differential decomposition of their picrates on the columns by various eluents. The method can be used for the determination of histidine in the presence of other imidazole derivatives.

Published
1966

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