Zheden Vanessa, Von Byern Janek, Kerbl Alexandra, Leisch Nikolaus, Staedler Yannick, Grunwald Ingo, Power Anne Marie, Klepal Waltraud
Faculty of Life Sciences, Core Facility of Cell Imaging and Ultrastructure Research, University of Vienna, Austria.
Biol Bull. 2012 Oct;223(2):192-204. doi: 10.1086/BBLv223n2p192.
Barnacles produce a proteinaceous adhesive called cement to attach permanently to rocks or to other hard substrata. The stalked barnacle Dosima fascicularis is of special interest as it produces a large amount of foam-like cement that can be used as a float. The morphology of the cement apparatus and of the polymerized cement of this species is almost unknown. The current study aims at filling these gaps in our knowledge using light and electron microscopy as well as x-ray microtomography. The shape of the cement gland cells changes from round to ovoid during barnacle development. The cytoplasm of the gland cells, unlike that of some other barnacles, does not have distinct secretory and storage regions. The cement canals, which transport the cement from the gland cells to the base of the stalk, end at different positions in juvenile and mature animals. With increasing size of the cement float, the exit of the cement canals shift from the centrally positioned attachment disk of the vestigial antennules to more lateral positions on the stalk. The bubbles enclosed in the foam-like float are most likely filled with CO(2) that diffuses from the hemolymph into the cement canal system and from there into the cement.
藤壶会分泌一种名为“胶黏剂”的蛋白质类物质，以便永久附着在岩石或其他坚硬的基质上。有柄藤壶Dosima fascicularis特别引人关注，因为它会产生大量泡沫状的胶黏剂，这种胶黏剂可用作漂浮物。该物种的胶黏器及聚合胶黏剂的形态几乎无人知晓。当前的研究旨在通过光学显微镜、电子显微镜以及X射线显微断层扫描技术填补我们在这方面的知识空白。在藤壶发育过程中，胶腺细胞的形状从圆形变为卵形。与其他一些藤壶不同，该腺细胞的细胞质没有明显的分泌区和储存区。将胶黏剂从腺细胞输送到柄基部的胶黏管，在幼体和成熟动物体内的终止位置不同。随着胶黏漂浮物尺寸的增大，胶黏管的出口从残留小触角中央位置的附着盘转移到柄上更靠外侧的位置。泡沫状漂浮物中包裹的气泡很可能充满了二氧化碳，这些二氧化碳从血淋巴扩散到胶黏管系统，再从那里进入胶黏剂中。
