而PL浓度的进一步增大会导致拉长结构进一步生长，并出现局部膨胀现象，这些都展示出硅藻壳面发育早期的一些特征。
Localized enlargement can also be observed during further growth of elongated structures , displaying some features of the earliest recognizable stage of valve development in diatoms .
硅藻壳