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RNA Stability01:53

RNA Stability

Intact DNA strands can be found in fossils, while scientists sometimes struggle to keep RNA intact under laboratory conditions. The structural variations between RNA and DNA underlie the differences in their stability and longevity. Because DNA is double-stranded, it is inherently more stable. The single-stranded structure of RNA is less stable but also more flexible and can form weak internal bonds. Additionally, most RNAs in the cell are relatively short, while DNA can be up to 250 million...

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Controlling the Size, Shape and Stability of Supramolecular Polymers in Water
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Published on: August 2, 2012

在基于BEDT-TTF的分子导体中的多稳定性.

Elena Laukhina1, José Vidal-Gancedo, Vladimir Laukhin

  • 1Institut de Ciència de Materials de Barcelona (CSIC), Campus Universitari de Bellaterra, Spain. cun@icmab.es

Journal of the American Chemical Society
|March 27, 2003
PubMed
概括

这项研究表明,有机导体 (BEDT-TTF) 2Br1.3I1.1Cl0.6在半导体和金属状态之间表现出独特的相位过渡. 这些转换发生在高温和低温下,具有显著的hysteresis和属性变化.

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科学领域:

  • 材料科学 材料科学 材料科学
  • 固态物理 固态物理
  • 有机电子 有机电子

背景情况:

  • 低维的有机导体表现出复杂的相位行为.
  • 分子固体中的多态性可以导致不同的电子性质.
  • (BEDT-TTF) 2Br1.3I1.1Cl0.6是一种独特的分子固体,具有可调节电子状态的潜力.

研究的目的:

  • 为了研究 (BEDT-TTF) 2Br1.3I1.1Cl0.6.6 的晶体多态和相变.
  • 描述半导体-金属过渡及其温度依赖性.
  • 阐明分子间相互作用在观察到的多态性中的作用.

主要方法:

  • 测量DC导电性的测量
  • 电子自旋共振 (ESR) 光谱学
  • 进行X射线衍射分析.
  • 在 Ab initio 计算过程中,

主要成果:

  • 这种材料存在三种多态形式:α-,α'-和β'-相.
  • 在低温 (< 185 K) 和高温 (> 395 K) 均观察到可逆的半导体-金属相位过渡 (alpha " <--> beta ').
  • 阿尔法相过渡发生在高温下,所有这些都表现出显著的歇斯底里和剧烈的属性变化.

结论:

  • 双极双极相互作用被认为是推动这种分子固体中丰富多态性的关键因素.
  • 能够在低温和高温下访问类似金属的β'相,凸显了它的独特性质.
  • 观察到的相位过渡为开发具有可调节性质的新型有机电子设备提供了机会.