The global solution for a coupled nonlinear Klein-Gordon system in twodimensional space was studied. First, a sharp threshold of blowup and global existence for the system was obtained by constructing a type of cross-constrained variational problem and establishing so-called cross-invariant manifolds of the evolution flow. Then the result of how small the initial data for which the solution exists globally was proved by using the scaling argument.

Ihe synthesis of phosphorylated AchynmUres bidentota pdysaccbaride (P-AbPS) wss reported based on Merent strategies.obtained when phosphorus oxycbloride (PO(&) was used as a phosphorylating agent and trimethyl phosphate-pyridine or dimethyl formamide wss used as solvent. The hhences of different solvents and d o n conditions were discussed . The pharmmlogv assay shorn that P-AhPS postses antitumor activity against sarcoma 180 and Lewis lung cancer in mice. The P-AbFS With l&h d m of s u b s t i w o n (D.S. > 0.5) WBS

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