生化分析用荧光纳米粒子研究进展

荧光纳米粒子在生化分析领域的应用研究近十年来取得了令人瞩目的进展,引起了研究者的广泛关注,如何制备强荧光发光、高生物亲和的荧光纳米粒子是其在生化分析领域应用的前提和基础。本文评述了近年来在生化分析领域应用较多的几种荧光纳米粒子的研究进展与状况。引用文献103篇。     

含极大η-单调算子的广义非线性混合似变分包含组的扰动算法和稳定性

研究了一类含极大η-单调算子的广义非线性混合似变分包含组.依据不动点理论和极大η-单调算子的预解算子技巧,在Hilbert空间中提出了一种求这类变分不等式组的逼近解的扰动迭代算法,并证明了这类算法的收敛性和稳定性.所得结果是新的,并推广和统一了近期文献中的一些相关结论.     

Effects of oxygen concentration and irradiation defects on the oxidation corrosion of body-centered-cubic iron surfaces: A first-principles study

Oxidation corrosion of steels usually occurs in contact with the oxygen-contained environment, which is accelerated by high oxygen concentration and irradiation. The oxidation mechanism of steels is investigated by the adsorption/solution of oxygen atoms on/under body-centered-cubic (bcc) iron surfaces, and diffusion of oxygen atoms on the surface and in the near-surface region. Energetic results indicate that oxygen atoms prefer to adsorb at hollow and long-bridge positions on the Fe(100) and (110) surfaces, respectively. As the coverage of oxygen atoms increases, oxygen atoms would repel each other and gradually dissolve in the near-surface and bulk region. As vacancies exist, oxygen atoms are attracted by vacancies, especially in the near-surface and bulk region. Dynamic results indicate that the diffusion of O atoms on surfaces is easier than that into near-surface, which is affected by oxygen coverage and vacancies. Moreover, the effects of oxygen concentration and irradiation on oxygen density in the near-surface and bulk region are estimated by the McLean's model with a simple hypothesis.     

柠檬酸荧光碳点的合成及其在Fe(Ⅲ)检测和细胞成像中的应用

以柠檬酸为原料,采用一步水热法合成荧光碳点。所合成的荧光碳点在310nm激发波长下的荧光量子产率为5.3%,发射光谱随着激发波长红移而红移。透射电镜(TEM)表征显示荧光碳点在水溶液中分布均匀,平均粒径为2.9nm。红外(IR)光谱和Zeta电位结果表明碳点表面有羧基和羟基等活性官能团。Fe(Ⅲ)对这些荧光碳点表现出选择性猝灭效果,这种现象可以用于Fe(Ⅲ)检测。在10mmol/L的HEPES缓冲溶液(pH=7.0)中,荧光碳点的荧光强度随着Fe(Ⅲ)浓度的增加逐渐衰减。该方法对Fe(Ⅲ)测定的线性范围为100~500μmol/L,检出限为112.5nmol/L。细胞成像结果表明,柠檬酸的碳点可进入到B16-F10细胞内,并在405nm和488nm激光照射下发出不同颜色的荧光。以上结果表明该碳点在Fe(Ⅲ)检测和细胞成像方面有潜在应用价值。     

基于CT切片特征匹配的三维体重建

详细描述了医学解剖学切片图数据读取,特征提取和特征匹配.引入了解剖数据读取方法,叙述了切片匹配的两个过程:特征提取和特征匹配.提出了一种新的有效的特征匹配方法.所有切片图象在匹配之前首先进行了预处理(如滤波、二值化、细化等过程),特征是分区域进行提取的.匹配方法分两步,首先按照对应特征点之间距离的方法匹配特征点,然后用矩的方法进行切片之间匹配.体重建过程中还使用了三维等值面和插值方法.实验结果证实这种特征匹配方法不仅快速而且准确.     

从废铁屑电解制备纯铁及其腐蚀特性

以工业废铁屑作原料制备高纯度电解铁,并优化了在氯化物溶液中的电解工艺条件,所得样品纯度最高可达到99.983%.通过SEM断面形貌观察,该电解铁样品非常致密.交流阻抗及腐蚀速率测定表明,电解铁的纯度越高,其耐腐蚀性能越好.