• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Journal of Molluscan Studies >An ultrastructural study of the gland of Leiblein of muricid and nassariid neogastropods in relation to function, with a discussion on its homologies in other caenogastropods
【24h】

An ultrastructural study of the gland of Leiblein of muricid and nassariid neogastropods in relation to function, with a discussion on its homologies in other caenogastropods

机译：鼠李和鼻涕新腹足动物的Leiblein腺与功能相关的超微结构研究，并讨论了其在其他腹足动物中的同源性

获取原文
获取原文并翻译 | 示例
       
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

The gland of Leiblein of the muricid Nucella lapillus and the nassariid Hinia reticulata has been examined by scanning and transmission electron microscopy. The origin and functional significance of its complex organization and its relationship with the rest of the mid-oesophagus in Nucella are discussed. It is absorptive as well as secretory, and a mechanism is proposed by which solute-rich fluids may enter the gland. Its epithelium is composed of occasional mucous cells and two major cell types: ciliated cells engaged in protein metabolism and unciliated cells responsible for uptake and storage of lipids and carbohydrates, both of which show evidence of pinocytotic uptake of solutes and intracellular digestion in lysosomes. Some enzyme activity persists in the residual bodies they shed by apocrine secretion, but they remain intact in a mucous string until they reach the stomach. Preliminary ultrastructural examination indicates that the gland absorbs cadmium not only from the blood but also directly from its lumen and that it may have the capacity to sequester a wide range of toxins. The same types of cell occur in Hinia in which their cyclical activity has been correlated with feeding. Similar cells have been identified in the oesophageal glands of other prosobranchs. The foregut glands of carnivorous caenogastropods are compared with the gland of Leiblein. There is an inverse correlation between the role of the mid-oesophagus in digestion and absorption and the complexity of the stomach.
机译：已通过扫描和透射电子显微镜检查了鼠疫性Nucella lapillus的Leiblein腺和网状鼻虫Hinia reticulata的腺体。讨论了其复杂组织的起源和功能意义，以及与海藻属中食管其余部分的关系。它既具有吸收性又具有分泌性，并提出了一种机制，富溶质的流体可以通过该机制进入腺体。它的上皮由偶然的粘液细胞和两种主要的细胞类型组成：参与蛋白质代谢的纤毛细胞和负责脂质和碳水化合物摄取和储存的未纤毛细胞，这两者均显示出溶质的胞吞摄取和溶酶体的细胞内消化。一些酶的活性持续存在于它们通过顶泌分泌而脱落的残留物中，但是它们在粘液中保持完整直到到达胃为止。初步的超微结构检查表明，腺体不仅从血液中吸收镉，而且还直接从其内腔吸收镉，并且它可能具有螯合多种毒素的能力。在Hinia中出现了相同类型的细胞，这些细胞的循环活性与进食相关。在其他前分支的食道腺中也发现了类似的细胞。将食肉的食足动物的前肠腺与Leiblein腺进行比较。中食管在消化和吸收中的作用与胃的复杂性之间呈负相关。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号