Concentric Inclusions in the Intestinal Epithelium of Echiura Bonellia viridis: Structure and Possible Functionстатья
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Дата последнего поиска статьи во внешних источниках: 7 июля 2021 г.
Аннотация:The study of the anatomy and fine structure of Ehiura is of great importance for understanding of the biology of these animals, which lead a hidden lifestyle and dominate various benthic communities. The use of scanning and transmission electron microscopy allowed to obtain the first data on the organization of the siphonal part of the midgut of Bonellia viridis females. For the first time, unusual concentric inclusions with certain fine structure are discovered in the cells of the midgut. These concentric inclusions have the same fine organization as concentric inclusions in the gut of many nematode species and in tegument of some flatworms. For these animals, it is known that concentric inclusions play an important role in binding of chemical agents inherent in redox environments. Interestingly, the studied individuals of B. viridis were found on the surface of a substrate devoid of signs of a redox environment. The new results indicate that B. viridis, and, possibly, all ehiurids, have preadaptations to life in redox environments. New data on the structure and composition of concentric inclusions will shed light on their origin and function.