信息保护系统脆弱性评价方式研究

保证可信度的评价标准得到了统一,但各国的评价方法等客观性的保证方面上的一些部分还是有点模糊。换言之,脆弱性评价有范围,深度,实验用道具,提纲和评价者因素,而随着这些因素的不同其评价结果也会出现差异,这样一来,评价的公正性和客观性的保证上就存在困难。本论文提出了能保证信息保护产品保安脆弱性评价的公正性客观性和效率性的信息保护产品保安脆弱性评价方法,体现了自动化完成评价系统的设计。     

Synthesis and physical properties of pH-sensitive semi-IPN hydrogels based on poly(dimethylaminoethyl methacrylate-co-PEG dimethacrylate) and poly(acrylic acid)

Hydrogels of semi-interpenetrating polymer networks (semi-IPNs) were prepared by two step reactions. Dimethylaminoethyl methacrylate (DMAM) and poly(ethylene glycol)-dimethacrylate (PEGDM) were copolymerized to yield hydrogels, and then acrylic acid (AA) monomer were adsorbed in the hydrogels followed by polymerization of AA to produce semi-IPNs. The swelling behavior of semi-IPNs depends largely on pH of medium, showing that the degree of swelling of the semi-IPNs exhibits a minimum at pH 6.0. It is observed that the elastic modulus of semi-IPNs is closely related to its swelling behavior.     

Reversing the inactivation of peroxiredoxins caused by cysteine sulfinic acid formation

The active-site cysteine of peroxiredoxins is selectively oxidized to cysteine sulfinic acid during catalysis, which leads to inactivation of peroxidase activity. This oxidation was thought to be irreversible. However, by metabolic labeling of mammalian cells with 35S, we show that the sulfinic form of peroxiredoxin I, produced during the exposure of cells to H2O2, is rapidly reduced to the catalytically active thiol form. The mammalian cells' ability to reduce protein sulfinic acid might serve as a mechanism to repair oxidatively damaged proteins or represent a new type of cyclic modification by which the function of various proteins is regulated.