带临界指数的蜕化p-Laplace方程解的存在性

在含有临界指数的p-Laplace方程，由于嵌入Hp^1.p（Ω）→L^p＊b（Ω，｜x｜^-α）不紧，如果直接运用标准变分方法去讨论其临界点的存在是比较困难的．为此，采用集中紧原理，证明了方程的非平凡解的存在性．     

基于SnO2/TiO2/Au NPs纳米复合材料发展光电化学方法特异性检测唾液酸

制备了氧化铟锡（ITO）/二氧化锡（SnO₂）/二氧化钛（TiO₂）/金纳米粒子（Au NPs）纳米复合电极（ITO/SnO₂/TiO₂/Au NPs）,并利用它发展了可以选择性检测唾液酸（SA）的光电化学（PEC）法.采用旋涂法制备了ITO/SnO₂电极,并通过静电纺丝和磁控溅射技术在ITO/SnO₂表面原位合成了TiO₂纳米纤维和Au NPs.与单纯SnO₂比,ITO/SnO₂/TiO₂/Au NPs纳米复合电极的光电性能显著提高.这可能与Au NPs的局域表面等离子体共振效应（LSPR）和TiO₂/SnO₂异质结之间的协同作用密切相关.之后,通过金硫键（Au-S）将四巯基苯硼酸（4-MPBA）修饰在ITO/SnO₂/TiO₂/Au NPs电极表面,利用4-MPBA和SA之间的非特异性酯化反应,发展了可以特异性检测SA的PEC传感平台.     

空心莲子草对含Zn2+废水的净化研究

通过实验室静态净化实验,研究了空心莲子草在含Zn2+培养液中对Zn2+的净化效率和叶片中丙二醛(MDA)含量、过氧化氢酶(CAT)活性的变化.实验结果表明,空心莲子草对含Zn2+废水有较强的净化能力,其富集量为根茎多于叶.随着植株含Zn2+量的升高,CAT活性下降,MDA含量升高.     

乙醇酸氧化酶底物诱导实验

乙醇酸氧化酶底物诱导实验徐杰（华南师范大学生物技术研究所广州５１０６３１）关键词乙醇酸氧化酶；底物诱导；６６ｋｕ蛋白中图分类号Ｑ９４６．５我们用改进后的方法，即粗蛋白在柱层析前加人适量的ＦＭＮ，硫酸铰质量分数分布范围改为１５％一２５％，其余按［１１纯...     

Species-specific differences in the mitogenic activity of heparin-binding growth factors in the sera of various mammals

Sera from different mammalian species displayed great differences in mitogenic activity, as measured by stimulation of DNA synthesis in BALB/c 3T3 cells (3T3 cells). Among the sera examined, fetal bovine serum was least active, and increasing activity was detected in calf serum, human serum, rat serum and mouse serum, in that order. Rat and mouse sera exhibited extremely high mitogenic activity with 3T3 cells, but when TIG-1 human fetal lung fibroblasts were used for the DNA assay instead, the activity levels of all of the sera were lower, and the differences between them were smaller. To determine the reasons for these differences, the heparin-binding growth factors in each serum were separated on a heparin affinity column. Five peaks of DNA-stimulating activity were obtained. Three of these were found in all sera examined, with both 3T3 cells and TIG-1 cells. Two other peaks were found only with 3T3 cells; one was peculiar to rat and mouse sera, with extremely high activity in the rat, and the other was specific to fetal serum. The dependence of the activity of these peaks on the cells used for the test was confirmed using normal rat lung fibroblasts and immortalized rat kidney cells. These findings adequately explain the species-specific differences in mitogenic activity of whole sera, and the variation in activity depending on the cells used for assay of DNA synthesis.     

钝化304不锈钢单晶在硫酸含氯介质中的孔蚀

采用交流阻抗技术,研究钝化304不锈钢单晶体在pH1.0,0.25mol/lNa_2SO_4含氯介质中的孔蚀行为。对孔蚀过程中的阻抗频谱特征进行了分析,提出孔蚀的发生和发展过程中都有复合物(MOHC1)形成。复合物进一步吸附更多的氯离子,导致溶解反应发生。并提出一个孔蚀的的反应机理模型,它与304不锈钢多晶体在硫酸含氯介质中的孔蚀机理没有本质的差别。     

高山花椰菜多酚氧化酶活性影响因素的研究

研究了几种还原剂对高山花椰菜多酚氧化酶(PPO)活性的影响.结果表明:150 mg/L的L-半胱氨酸、200 mg/L的抗坏血酸、150mg/L的亚硫酸钠可分别抑制PPO活性的91.7%、79.2%和83.2%,其中L-半胱氨酸是对PPO抑制效果最好的还原剂,L-半胱氨酸的添加量应以500mg/L为宜.