磁性纳米四氧化三铁在生物医学中的应用

近年来,由于磁性纳米粒子在实际应用中发挥越来越重要的作用,有关磁性纳米粒子的应用受到科学界广泛关注,特别是生物医学领域。由于磁性纳米Fe_3O_4粒子制作简单且晶体对细胞无毒,在生物医药领域大量应用,磁性纳米Fe_3O_4粒子主要通过表面包覆成为免疫磁性微球进行使用。简述了磁性纳米Fe_3O_4粒子的制备方法,重点综述了近些年磁性纳米Fe_3O_4粒子在生物医学上的应用,包括磁共振成像技术、磁分离技术、靶向药物载体技术、肿瘤热疗技术、造影剂技术,并且阐述了磁性纳米Fe_3O_4粒子的发展前景。     

两维荧光光谱技术及最佳光谱分辨率设计

研究和发展了一种两维荧光光谱测量及成像技术,讨论获得两维空间离散点的最佳光谱分辨率的方法.该技术以棱镜色散原理为基础,利用微透镜阵列实现对样品的离散化照明,充分发挥光学系统固有的并行处理能力,实现了在一个面阵探测器上同时记录两维空间的荧光光谱图像.与逐点扫描方法相比,该技术的扫描效率随激发点数线性提高,具有快速测量、高空间和高光谱分辨的特点,可用于生物医学领域.     

纳米淀粉微球的制备及其在生物医药中的应用

综述了纳米淀粉微球的3种制备方法:物理法、化学法和反相微乳液法,介绍了反相微乳液法制备纳米淀粉微球的原理、制备步骤、淀粉微球性质及其在生物医药领域的应用。     

Ultrasmall Ag+-rich nanoclusters as highly efficient nanoreservoirs for bacterial killing

Metallic silver （Ag） and its ability to combat infection have been known since ancient history. In the wake of nanotechnology advancement, silver＇s efficacy to fight broad spectrum bacterial infections is further improved in the form of Ag nanoparticles （NPs）. Recent studies have ascribed the broad spectrum antimicrobial properties of Ag NPs to dissociation of Ag＊ ions from the NPs, which may not be entirely applicable when the size of Ag NPs decreases to the sub-2 nm range [denoted Ag nanoclusters （NCs）]. In this paper we report that ultrasmall glutathione （GSH）-protected Ag^＋-rich NCs （Ag^＋-R NCs for short, with a predominance of Ag＋ species in the NCs） have much higher antimicrobial activities towards both gram-negative and gram-positive bacteria than the reference NC, GSH-Ag^＋-R NCs. They have the same size and surface ligand, but with different oxidation states of the core silver. This interesting finding suggests that the undissociated Ag^＋-R NCs armed with abundant Ag^＋ ions on the surface are highly active in bacterial killing, which was not observed in the system of their larger counterpart, Ag NPs.