De Terra N
J Exp Zool. 1977 May;200(2):237-41. doi: 10.1002/jez.1402000205.
This paper describes experiments involving reciprocal exchange of the oral apparatus between a large (L) and a small (S) strain of Stentor coeruleus. Mature L-strain stentors given and S-strain oral apparatus formed an oral primordium in response to the presence of abnormally small oral structures and mostly divided although a few reorganized instead. Conversely, when S-strain stentors in early division were given a large L-strain oral apparatus, they resorbed the developing primordium and returned to interphase. When combined with previous results, these findings provide evidence for the hypothesis that the time of cell division in Stentor is determined by a "critical" ratio between the size of the oral apparatus and the size of the cell body (somatic) cortex. This ratio develops because the somatic cortex grows during interphase and the oral apparatus does not. Cell division in Stentor therefore appears to be initiated by a cortical pattern change resulting from cell surface growth during interphase.
本文描述了涉及在大型（L）和小型（S）蓝喇叭虫品系之间相互交换口器的实验。给予成熟的L品系喇叭虫S品系的口器，它们会因异常小的口器结构的存在而形成口原基，并且大多进行分裂，尽管有少数会重新组织。相反，当处于早期分裂阶段的S品系喇叭虫被给予大型L品系的口器时，它们会吸收正在发育的原基并回到间期。结合先前的结果，这些发现为以下假设提供了证据：喇叭虫的细胞分裂时间由口器大小与细胞体（体细胞）皮层大小之间的“临界”比率决定。这个比率的形成是因为体细胞皮层在间期生长而口器不生长。因此，喇叭虫的细胞分裂似乎是由间期细胞表面生长导致的皮层模式变化引发的。
