A Feynman propagator is constructed for the effective interaction between electrons which takes into account the polarizability of the medium of unexcited particles in the Fermi sea.

欲从实验和理论完整了解蛋白质的稳定性及动性是一个挑战，这往往需要对摺叠和非摺叠态的蛋白质之间交互作用做具体的分析。