Izvekova G I, Kuperman B I, Kuz'mina V V
Laboratory of Ecological Parasitology, I.D. Papanin Institute of Biology of Inland Waters, Russian Academy of Sciences, Borok, Yaroslavl Prov., Russia.
Comp Biochem Physiol A Physiol. 1997 Dec;118(4):1165-71. doi: 10.1016/s0300-9629(97)00040-6.
The structural and functional organization of digestive-transport surfaces in some lower cestodes and their fish hosts was studied. It has been shown that the ultrastructure of cestode microtriches and fish enterocyte microvilli being the basis of membrane-linked digestion is quite similar. These organelles increase the digestive-transport surfaces both in helminths and fishes. However, the hydrolytic enzyme activity in helminths is usually 2-4 times lower than that of the fishes. Desorption (adsorption) characteristics of various hydrolases in helminths and fishes are also different. In helminths the easily desorbed fraction of each enzyme is always more abundant than in fishes. In contrast, the intensity of transport processes in helminths is higher when compared with fishes. The adaptation of digestive-transport surfaces and enzyme systems to feeding conditions is discussed.
对一些低等绦虫及其鱼类宿主中消化 - 运输表面的结构和功能组织进行了研究。结果表明，作为膜联消化基础的绦虫微毛和鱼肠上皮细胞微绒毛的超微结构非常相似。这些细胞器增加了蠕虫和鱼类的消化 - 运输表面。然而，蠕虫中的水解酶活性通常比鱼类低2 - 4倍。蠕虫和鱼类中各种水解酶的解吸（吸附）特性也不同。在蠕虫中，每种酶的易解吸部分总是比鱼类中更丰富。相反，与鱼类相比，蠕虫中的运输过程强度更高。讨论了消化 - 运输表面和酶系统对摄食条件的适应性。
