Fine structure of midgut cells of some White Sea free-living nematodesстатья
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Аннотация:Midgut of nematodes is a straight tube consisting of a single layer of epithelialcells lined by layer of microvilli, which are covered by a glycocalyx. There are usualorganelles in cells: nuclei, mitochondria, digestive vacuoles, endoplasmic reticulum, Golgicomplexes. Gut cells of different nematode species could vary widely. We studied tenspecies of White Sea nematodes: Bathylaimus arcticus Kreis, 1963, Oxystomina sp.,Paracanthonchus caecus Micoletzky, 1924, Halichoanolaimus robustus (Bastian, 1865),Desmodora communis (Bütschli, 1874), Draconema ophicephalum (Claparède, 1863),Paramonhystera filamentosa (Ditlevsen, 1928), Sphaerolaimus balticus Schneider, 1906,Odontophora deconinki Galtsova, 1976 and Sabatieria ornata (Ditlevsen, 1918). Almostall organelles have some their own features in the cells for each species. Some organellesseem to be dependent on the stage of food digestion, while others have been associated witha taxonomic position or with a food object. In cells of all species small digestive vacuolesare observed, but some species have big ones. They can be created by fusion of smalldigestive and enzyme vacuoles. Lipid droplets are indicated in cells of almost all species.Quantity of these droplets can be depending on digestive stage. Microvilli and glycocalyxdo not have a clean connection either with the type of food, or with the taxonomic positionof the nematodes. But if glycocalyx is complex we can see correlation with taxonomicposition of nematodes: similar type of glycocalyx and microvilli are observed for nematodesfrom one order.