UNIFORM ESTIMATES OF SOLUTIONS OF δ^--EQUATION ON STEIN MANIFOLDS

By means of the Hermitian metric and Chern connection, Qiu [4] obtained the Koppelman-Leray-Norguet formula for （p, q） differential forms on an open set with C^1 piecewise smooth boundary on a Stein manifold, and under suitable conditions gave the solutions of δ^--equation on a Stein manifold. In this article, using the method of Range and Siu [5], under suitable conditions, the authors complicatedly calculate to give the uniform estimates of solutions of δ^--equation for （p, q） differential forms on a Stein manifold.     

聚肽的结构性能及其在生物材料领域的应用

聚肽是一类由氨基酸及其衍生物通过聚合反应形成的聚合物，具有和蛋白质类似的二级结构。由于其独特的结构和性能，近年来在蛋白质结构模拟、分子链构象研究、生物医学等领域被广泛地加以研究。本文着重介绍了聚肽的合成、分子链构象、相行为、自组装行为以及在药物缓释等领域的研究和应用状况，并对聚肽在组织工程领域的应用前景进行了展望，为聚肽在生物材料领域的应用提供参考。     

聚肽接枝共聚物的自组装行为研究

Polymeric micelles of poly(γ-benzyl L-glutamate)(PBLG)-poly(ethylene oxide)(PEO) graft copolymer were prepared by the dialysis method in deionized water. Fluorescence spectroscopy, nuclear magnetic resonance(NMR) and transmission electron microscope(TEM) were used for the investigation of the self-assembly of PBLG-PEO graft copolymer. Fluorescence spectrosco0y measurements suggest that PBLG-PEO graft copolymer associates to form polymeric micelles in water. ^1H NMR measurements further prove that in aqueous medium PBLG-PEO graft copolymer could assemble into polymeric micelles with PBLG segments as the hydrophobic inner core and PEO segments as the hydrophilic shell. The results of the TEM observations show that the polymeric micelles of PBLG-PEO graft copolymer are almost spindly shaped, which are different from the morphology of the spherical micelles formed by PBLG-PEO block copolymer. Polymeric micelles formed by polypeptide copolymer have potential application as drug carrier in controlled-release delivery system.     

一类具有标量旗曲率的Berwald(α,β)-度量(英文)

本文研究了一类具有F=α+εβ+kα²/β形式的Finsler度量,其中α=（aijyⁱy^j）^1/2是Riemann度量,β=b_iyⁱ是非零1-形式,ε和k≠0是常数。得到了这个Finsler度量的S曲率消失和成为弱Berwald度量的充要条件。另外通过证明发现具有标量期曲率的Finsler度量成为弱Berwald度量的充要条件是它们成为Berwald度量,并且期曲率消失。在这种情况下,该Finsler度量就是局部Minkowski度量。     

HYPERHOLOMORPHIC THEORY ON KAEHLER MANIFOLDS

First of all,using the relations (2.3),(2.4),and (2.5),we define a complex Clifford algebra Wn and the Witt basis.Secondly,we utilize the Witt basis to define the operators (6) and (6^) on Kaehler mani...     

Triton X-100增敏催化动力学光度法测定痕量亚硝酸根

基于稀硫酸介质中,Triton X-100对亚硝酸根催化氯酸钾氧化甲基紫褪色反应的增敏作用,建立了测定痕量亚硝酸根的Triton X-100增敏催化动力学光度法.方法的线性范围为0.004-0.26μg·mL-1,检出限为9.24×10-10g·mL-1.测得反应表观活化能为75.33kJ·mol-1.方法简便、快速,选择性好.用于水样及蔬菜祥品中痕量亚硝酸根的测定,结果满意.