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首页> 外文期刊>Marine biology >The cement apparatus of the stalked barnacle Pollicipes pollicipes
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The cement apparatus of the stalked barnacle Pollicipes pollicipes

机译：藤壶柄柄的水泥设备

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摘要

Barnacles are sessile marine crustaceans that produce a proteinaceous cement to attach themselves to the underwater surfaces of natural or man-made structures. This work was carried out to characterize the cement apparatus and localize this structure in the peduncle of the stalked barnacle Pollicipes pollicipes. Light and transmission electron microscopy techniques were used for these purposes. Sections of the peduncle revealed a central core encircled by a thick layer of muscular tissue. The cement apparatus, formed by clusters of adhesive-secreting cells and ducts, was located in the central core embedded in an apical layer of connective tissue with a thickness of a few mm, just beneath the capitulum. The ovary was also found in the peduncular core, but most of it was located below the region containing the cement apparatus. The cytoplasm of adhesive-secreting cells was very rich in rough endoplasmic reticulum and also contained small electron-dense secretory vesicles. Histochemical methods applied to semithin sections showed that these vesicles were filled with proteins, being also PAS positive. The voluminous nuclei of these cells presented diverse and irregular shapes, typically with very thin and long extensions, containing large nucleoli and a great amount of heterochromatin. Electron-dense inclusions with a concentric lamellar structure were also seen in these nuclei, resembling nuclear inclusions reported in fish oocytes. These cells presented the features of very active protein-secreting cells, being similar to the adhesive-secreting cells of other species of stalked barnacles.
机译：藤壶是无柄的海洋甲壳类动物，会产生一种蛋白质状的水泥，将其附着在天然或人造结构的水下表面上。进行这项工作以表征水泥设备并将这种结构定位在茎藤壶Pollicipes pollicipes的花序梗中。光和透射电子显微镜技术用于这些目的。花序梗的部分显示出中央的核心，被厚厚的肌肉组织包围。由粘合剂分泌的细胞和导管簇形成的骨水泥装置位于中央核中，中央核嵌在结缔组织的顶端层中，其厚度为几毫米，恰好在头盖骨下方。子房也被发现在椎弓根的核心，但大部分位于骨水泥装置的下方。黏着分泌细胞的细胞质富含内质网，还含有小的电子致密分泌小泡。应用于半薄切片的组织化学方法显示，这些囊泡中充满了蛋白质，PAS阳性。这些细胞的巨大细胞核呈现出多种多样且不规则的形状，通常具有非常薄和很长的延伸，包含大的核仁和大量的异染色质。在这些核中还发现了具有同心层状结构的电子致密包裹体，类似于鱼类卵母细胞中报告的核包裹体。这些细胞表现出非常活跃的蛋白质分泌细胞的特征，类似于其他种类的藤壶的黏附分泌细胞。

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  • 来源
    《Marine biology》 |2017年第1期|11.1-11.8|共8页
  • 作者

    Lobo-da-Cunha Alexandre; Alves Angela; Oliveira Elsa; Cunha Isabel;

  • 作者单位

    Univ Porto, Dept Microscopy, Abel Salazar Inst Biomed Sci ICBAS, Rua Jorge Viterbo Ferreira 228, P-4050313 Oporto, Portugal|Interdisciplinary Ctr Marine & Environm Res CIIMA, P-4450208 Matosinhos, Portugal;

    Univ Porto, Dept Microscopy, Abel Salazar Inst Biomed Sci ICBAS, Rua Jorge Viterbo Ferreira 228, P-4050313 Oporto, Portugal;

    Univ Porto, Dept Microscopy, Abel Salazar Inst Biomed Sci ICBAS, Rua Jorge Viterbo Ferreira 228, P-4050313 Oporto, Portugal;

    Interdisciplinary Ctr Marine & Environm Res CIIMA, P-4450208 Matosinhos, Portugal;

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