First-principle study of excitonic self-trapping in diamond

We present a first-principles study of excitonic self-trapping in diamond. Our calculation provides evidence for self-trapping of the 1s core exciton and gives a coherent interpretation of recent experimental X-ray absorption and emission data. Self-trapping does not occur in the case of a single valence exciton. We predict, however, that self-trapping should occur in the case of a valence biexciton. This process is accompanied by a large local relaxation of the lattice which could be observed experimentally.Comment: 12 pages, RevTex file, 3 Postscript figure

Immobilisation of trypsin on poly (menthl methacrylate-Co-acryloylamino-2-methylpropanesulfonic acid)

Trypsin was immobilized on a copolymer of methyl methacrylate and 2-acryloylamino-2-methylpropanesulfinic acid. The resulting immobilized trypsin shows 25% of the soluble enzyme specific activity. The pH optimum of the immobilized trypsin is shifted to a higher value by 1,1 units. The pH stability of the immobilized trypsin is better than that of the soluble enzyme, whereas the temperature stability of the soluble and the immobilized enzyme is almost identical

Preparation and properties of immobilized amyloglucosidase

Amyloglucosidase was immobilized on a copolymer of methyl methacrylate and 2-dimethylaminoethyl methacrylate. The resulting immobilized amyloglucosidase has 19% of the soluble enzyme specific activity. The pH optimum of immobilized amyloglucosidase is shifted towards acidity by 1.9 units. The temperature optimum of immobilized enzyme is shifted upward by 5°C. The immobilized amyloglucosidase has the maximum stability at pH 4.6, whereas the soluble enzyme has maximum stability at pH 5.5. While soluble amyloglucosidase has a maximum thermal stability at 50°C, the stability of the immobilized amyloglucosidase steadily decreases with the increase in temperature

Immobilisation of Pepsin on chitosan

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