Experiments on decalcification and activation of osteoinductive ability, comparison between the osteogenesis of demineralized bone matrix in orthotopic and in heterotopic sites, and correlation between immune response to allograft of bone and osteoinductive activity of the graft, were reported in this paper. 1. Syngeneic deminerolized bone matrix and the mixture of DBM with bone ash or acid-soluble protein extracted from demineralization was implanted into muscle pouch of mice, subsequently, the inhibition of DBM osteoinduction by bone ash or acid-soluble protein was demonstrated with histological and by means of alkaline phosphatase assay.

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The S-L-E experiment data for the three groups of isomers were treated by using improved UNIFAC equation with new defining of some UNIFAC groups, we got better result.

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The experiments may contribute not only to investigating the mechanism of interaction between ldiotype and anti -idiotype T cells by which immune network are up-regulated, but also to analysing the suppressive effect of anti -idiotypic T cell or antibodies against the antigens on the activated T cells in the allo-responsiveness.

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Compared the homogeneous enthalpic interaction coefficients of glycine in aqueous potassium chloride solutions with that in aqueous sodium chloride solutions and discussed different cations influence on the interaction of glycine in aqueous solutions. The dilution enthalpies of DMF in aqueous ethylene glycol, glycerol, glucose and sucrose solutions of various molalities have been determined using CSC4400 flow microcalorimetry at

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