保守力做正功时相应的势能将减少

势能是属于物体体系的

势能是个相对量，与参考零点的选择有关

势能的大小与初、末态有关 ， 与路径无关

从空间一点到另一点保守力所做的功与路径无关

做功的路径如果回到原来的出发点，则保守力所做总功为零

物体在保守力场中运动其动能是守恒的

在保守力场中物体的运动满足功能关系

通过 可以计算任意保守力做的功

物体在保守力场中运动其动能一定会发生变化

保守力随空间位置变化，因此它做的功是空间位置的函数

The reaction is initiated at the broken ends of a double-strand break by the binding of a heterodimer consisting of the proteins Ku70 and Ku80. The Ku proteins are conserved in almost all eukaryotes and act as a kind of molecular scaffold to assemble the other protein components.

Ku70-Ku80 interacts with another protein complex containing a protein kinase called DNA-PKcs and a nuclease known as Artemis. Once the complex is assembled, the two broken DNA ends are synapsed (held together). DNA-PKcs autophosphorylates in several locations and also phosphorylates Artemis.

Artemis, when phosphorylated, acquires an endonuclease function that can remove 5′ or 3′ single-stranded extensions or hairpins that might be present at the ends. The DNA ends are then separated with the aid of a helicase, and strands from the two different ends are annealed at locations where short regions of complementarity are encountered.

Artemis cleaves any unpaired DNA segments that are created. Small DNA gaps are filled by a DNA polymerase, Pol μ or Pol λ. Finally, the nicks are sealed by a protein complex consisting of XRCC4 (X-ray cross complementation group), XLF (XRCC4-like factor), and DNA ligase IV.

保守力做正功时相应的势能将减少。

势能是属于物体体系的。

势能是个相对量，与参考零点的选择有关。

势能的大小与初、末态有关 , 与路径无关。