论文标题
将电图磁场耦合到螺旋结构中的振动模式
Coupling electrodynamic fields to vibrational modes in helical structures
论文作者
论文摘要
诸如α螺旋，DNA和微管之类的螺旋结构在生物学中具有极大的重要性。已经提出，这些成分单位的周期性排列可以支持类似于结晶固体的集体激发。在这里，我们检查了这种构建体与振荡偶极子之间的相互作用，并评估螺旋性在电动力场和振动之间的耦合中的作用。基于振动和本征函数分析，我们发现了一组相干振荡模式，这些模式会产生强大而定位的响应，频率的选择性和典型的相互作用范围。为了描述由于结构振动而引起的场散射，我们考虑了具有螺旋周期性的各向异性介电常数，该介性适用于所有振动类型和近乎偶极的位置。这里确定的这种新型的共振可能有助于解释电动力场在细胞环境中细胞骨架微管的多种功能中的作用。
Helical structures like alpha helices, DNA, and microtubules have profound importance in biology. It has been suggested that these periodic arrangements of constituent units could support collective excitations similarly to crystalline solids. Here, we examine the interaction between such constructs and oscillating dipoles, and evaluate the role of the helicity in the coupling between electrodynamic fields and vibrations. Based on a vibrational and eigenfunction analyses we discover a group of modes of coherent oscillations that give rise to a strong and delocalized response, selectivity in frequency, and typical interaction range. To describe the field scattering due to the structure vibrations we consider an anisotropic permittivity with a helical periodicity, which applies to all vibration types and close dipole locations. This new type of resonances identified here may help explain the role of electrodynamic fields in the diverse functionality of cytoskeletal microtubules in the cellular environment.
