Abstract : selective mechanisms exist in organism and biosphere , which select the cells with less dna injuy and reproduces them . there are two models ; mechanisms 1 and mechanisms 2 , represented respectively b bacteria and mechanolytes of human beings . cells with mechanisms 1 ( e . g . bacteria , generative cells , cancer cells ) can reproduce infinitely , while somatic cells can not . there are deep - going reasons behind the two categories of selective mechanisms . the canceration of the cells is a degenerating process from mechanisms 2 to mechanisms 1 摘要生物界存在一类筛选机制,它将dna损伤较小的细胞筛选出来,产生后代.主要有两类模式机制1和机制2 ,分别以细菌和人的成纤维细胞为代表,那些具有筛选机制1的细胞(如:细菌、生殖细胞、癌细胞)能无限传代,而体细胞则不能.这两类筛选机制背后有更深刻的原因,而细胞的癌变正是从机制2退化为机制1的过程。
First , the generalized elastic theory is employed into in single pile analysis . the degeneration solution is accordant with poulos " results . analyzing the load - displacement behavior of the battered pile , the results agree well with meyerhof ' s model experiments and zhanglm ' s centrifuge experiments 对于直桩，退化为弹性理论的计算结果同poulos的结果一致，退化为荷载传递法与他人的结果基本吻合；然后研究了斜桩的荷载-变形特性，把公式用于计算meyerhof的模型试验以及zhanglm的离心机试验的荷载-位移关系，发现同试验结果吻合较好。
