飞秒激光在细胞纳米手术中的应用

激光类型不同,其与生物组织的作用机理也不同。其中飞秒激光由于脉冲持续时间短、瞬时功率大、聚焦尺寸小的特点,使得其在超快、超强和超精细领域有着广阔的应用前景。而结构微小的细胞的动力学研究,如有丝分裂、变形和凋亡,对于了解细胞的生物和发育行为有着重要作用。且生物大分子和水几乎不吸收近红外波长的光,故考虑应用近红外飞秒激光对细胞进行手术。这种激光手术技术已用于对细胞内结构进行切割和蚀除。介绍了该技术在细胞领域中的一些应用,如纳米手术、基因转染和染色体切割等。与传统技术相比,该技术精度高,可在不损伤细胞活性的前提下对细胞进行实验。     

复制模塑法制备超疏水表面及其应用

Two kinds of poly(dimethylsiloxane) (PDMS) rough surfaces with different geometries which were square pillars and parallel grating were designed and fabricated by replica molding (REM). Scanning electron microscope (SEM) images showed that the fabricated samples had high fidelity. The contact angles of water droplet on the PDMS square pillars surface and parallel grating surface were (154.6依0.7)° and (160.2依1.9)°, respectively, and the sliding angles were not larger than 6° and 3°, respectively, which attained to the standard of superhydrophobicity. The experimental result of blood platelets adhesion demonstrated that these two superhydrophobic PDMS rough surfaces had better blood compatibility than PDMS planar surface. The crazing and shedding of microstructures in the replica molding were also analyzed and discussed. All results showed that these superhydrophobic materials may be used in industrial and agricultural fields and bioengineering field.