极化子维持的生物聚合物发夹环
Bio-Polymer Hairpin Loops Sustained by Polarons
摘要：
我们表明，极化子可以维持灵活的生物聚合物中的环状配置和环的大小取决于两个聚合物的抗弯刚度和电子-声子耦合常数。特别是，我们表明，对于单链DNA（ssDNA），这样的循环可以有少至10个碱基对。对于聚乙炔，最短的环必须至少有12个节点。我们还表明，这些配置是非常稳定的热波动下，可以促进发夹环的ssDNA的形成。
英文摘要：
We show that polarons can sustain loop-like configurations in flexible bio-polymers and that the size of the loops depend on both the flexural rigidity of the polymer and the electron-phonon coupling constant. In particular we show that for single stranded DNA (ssDNA) such loops can have as little as 10 base pairs. For polyacetylene the shortest loop must have at least 12 nodes. We also show that these configurations are very stable under thermal fluctuations and can facilitate the formation of hairpin-loops of ssDNA.
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