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Science:纳米球赐予英国常春藤大自然最强粘合剂

摘要 : 清除爬满你的房子的英国常春藤就算不是不可能,也很不容易,即使它们已经死亡。

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清除爬满你的房子的英国常春藤就算不是不可能,也很不容易,即使它们已经死亡。我们知道,在这些常青藤从墙上掉落前,建筑物的砖和石膏已经一片片脱落。130多年前,达尔文发现,常春藤的粘结力得益于它根部分泌的一种稀薄的黄胶。但那以后,这种胶的工作原理仍鲜为人知。现在,经过八年的调查以后,科学家们今天在《美国国家科学院院刊》上报告了其中的机制。这种胶的秘密成分是糖衣包裹的微小蛋白球。这是些高度统一的纳米球,它们因此得以散开并设法钻进角落和表面的缝隙里。一旦这种粘合胶中的水蒸发尽,这些纳米球便集中在一起,在钙和果胶等其它材料的帮助下,胶的强度加强了。该研究小组认为模仿这种机制或可创造出一些新的高强度粘合剂,甚至可以用于细胞组织工程,在制造人造器官时将细胞粘合到支架上。这种纳米颗粒还可以作为更为安全的靶向药递送系统。不同于现有的许多用来运送化疗进细胞的纳米材料,这些常春藤纳米颗粒不含有可能有毒的金属。

原文链接:

Nanoballs give English ivy one of nature’s strongest glues

原文摘要:

Clearing your house of English ivy—even after the plant has died—can be tough, if not impossible. Patches of brick and plaster have been known to come off buildings before the green-leaved vine surrenders its grip. More than 130 years ago, Charles Darwin discovered that ivy’s sticking power is thanks to a thin yellow glue secreted from its roots. But since then, little has been known about how the adhesive works. Now, after an 8-year investigation, scientists report the mechanism today in theProceedings of the National Academy of Sciences. The glue’s secret ingredients are tiny balls of sugar-coated proteins. These nanoparticles are highly uniform, allowing them to spread out and work their way into nooks and crannies of surfaces. once the adhesive’s water evaporates, the nanoballs concentrate, and with the help of other materials, including calcium and pectin, the glue hardens. The research team thinks mimicking the approach could yield some new high-strength adhesives—and might even work in tissue engineering to stick cells to scaffolds when building artificial organs. The nanoparticles also have potential as safer targeted drug delivery systems. Unlike many of the current nanomaterials used to ferry chemotherapies into cells, the ivy nanoparticles don’t contain metal, which can be toxic.

来源: Science 浏览次数:0

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