Znidarić D, Lui A
Z Mikrosk Anat Forsch. 1974;88(4):637-48.
Pelmatohydra oligactis was amputated in the central part of the gastral region and exposed to radiation of ultraviolet rays (2535 angstroms, 12 erg mm(-2)s(-2) for 7, 15 and 20 minutes. The regeneration of the proximal and distal part of the animal which was fixed 8, 24, 48, 72 and 96 hours after the cutting and radiation has been studied cito-histologically. The regeneration of the wounds caused by cutting and those caused by radiation have been compared. It has been found out that the wounds caused by radiation heal much harder and that the radiation-destroyed hypostome needs a longer period to regenerate than the cutting-removed hypostome. It is assumed that radiation-destroyed parts have an inhibitory effect upon environment. But, cito-histological changes concord to a great degree in both cases. The foot regeneration in the animals cut and exposed almost entirely concords the regeneration in the control animals which were cut but not exposed. Namely, both of them, as a rule, remain permanently without a foot. In the paper we have tried to explain these results and brought out the conclusion that hydras do not regenerate the foot because in the bud region there are many zimogen and interstitial cells which are not characteristic of a foot and that is why hydra has a directed growth exclusively toward the distal part, never the opposite. The growth is localized to the hypostome and the bud region. Radiation does not inhibit the process of the budding that has already begun. It is assumed that undamaged cell material travels from the gastroderm toward the bud and serves its formation.
将多斑绿水螅在胃区中部进行截肢，并暴露于紫外线（2535埃，12尔格·毫米⁻²·秒⁻²）下7、15和20分钟。对切割和辐射后8、24、48、72和96小时固定的动物近端和远端部分的再生进行了细胞组织学研究。比较了切割造成的伤口和辐射造成的伤口的再生情况。结果发现，辐射造成的伤口愈合困难得多，且辐射破坏的口盘比切割去除的口盘需要更长时间来再生。据推测，辐射破坏的部分对周围环境有抑制作用。但是，在这两种情况下，细胞组织学变化在很大程度上是一致的。切割并暴露的动物足部再生情况几乎与仅切割的对照动物的再生情况一致。也就是说，通常情况下，它们两者都永久性地没有足部。在本文中，我们试图解释这些结果，并得出结论：水螅不能再生足部，是因为在芽区有许多刺细胞和间质细胞，这些细胞不是足部所特有的，这就是为什么水螅的生长仅朝着远端进行，而不是相反方向。生长局限于口盘和芽区。辐射不会抑制已经开始的出芽过程。据推测，未受损的细胞物质从胃皮向芽移动并促进其形成。
