A polydiacetylene nanocrystalline film has been fabricated using surface evaporationmethod and observed by using Aurora 2000, TopoMetrix scanning near-field optical microscope(SNOM) system. The SNOM images of this fil...A polydiacetylene nanocrystalline film has been fabricated using surface evaporationmethod and observed by using Aurora 2000, TopoMetrix scanning near-field optical microscope(SNOM) system. The SNOM images of this film together with the standard testing Al sampleindicate that the resolution of the system is better than 80 nm 1/6 of the incident wavelength,488 nm. The possibility of SNOM data storage using thus fabricated film is also demonstrated.展开更多
文摘A polydiacetylene nanocrystalline film has been fabricated using surface evaporationmethod and observed by using Aurora 2000, TopoMetrix scanning near-field optical microscope(SNOM) system. The SNOM images of this film together with the standard testing Al sampleindicate that the resolution of the system is better than 80 nm 1/6 of the incident wavelength,488 nm. The possibility of SNOM data storage using thus fabricated film is also demonstrated.
文摘扫描近场光学显微镜突破衍射极限,具有纳米量级的空间分辨率,量子点(QD s)标记有荧光强度高且抗光漂白能力强等优点。结合上述两种技术,对人胃腺癌SGC-7901细胞膜表面特异性结合的叶酸受体(FR)进行成像探测,获得了叶酸受体在SGC-7901细胞膜表面上的分布,以及细胞内化外源性叶酸过程中叶酸受体在细胞膜表面的分布变化,成像的光学分辨率达到120 nm。实验结果表明:特异性结合的叶酸受体在SGC-7901细胞膜表面的分布,绝大部分是以聚集体的形式存在。随着SGC-7901细胞内化叶酸量的增加,叶酸受体在细胞膜表面的分布密度逐渐降低,并在经过120 m in左右趋于稳定。上述方法和手段为实现单细胞水平上靶点分布和变化的长期监测,肿瘤细胞内化受体的机制研究提供了新的技术途径。