By A. Péqueux, R. Gilles, W. S. Marshall (auth.), Prof. Dr. Rainer Greger (eds.)

After the pioneering experiences by way of Ussing and colleagues, stories of epithelial Nael shipping have come some distance. the 1st section of the phenomenological description of the mobile as a black field has been stick with­ ed by means of experiences of mobile mechanisms, the interaction of different trans­ port parts, and the mechanisms of rules. A large spectrum of tools has been utilized to many epithelia in numerous species. For the person epithelia delivery schemes were proposed, and, at this element i believe it truly is applicable to take a pause and look for components universal to numerous epithelia. This point brought on the publica­ tion of this e-book, and actually many of the chapters emphasize that the funetional eomponents, expressed within the a number of epithelia, usually are not in­ finite in quantity, yet they ensue in epithelia that are separated in evolu­ tion by means of numerous hundred million years. The authors come either from the sphere of veterinary and human body structure as weIl as from biology. in my view, the shut contacts and eollaborations among physiologists and biologists were crucial for the development during this box. I desire to thank all authors for his or her con­ tributions, and that i wish that the reader will take pleasure in this number of brand new stories on epithelia in nonvertebrates and vertebrates.

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His observations on the PD and electrical resistance further suggested that the giIls were more permeable to Na + ions than to CI- ions and the resulting diffusion potential modulated the Na + flux. It appears that these in vivo studies certainly do not lead to a clear picture of the real nature of the electrical potential difference existing between the external medium and the hemolymph of the species considered. These studies do not give conclusive information as to the processes participating in the establishment of the PD, nor as to what is going on at the level of the different pairs of giIls.

22). Assuming the eonversion of the energy in glueose to terrninal phosphate bonds of ATP being 44070 efficient, Engel et al. 008 eal h -1 g -1. ADP being the major rate-limiting faetor for energy metabolism, the equilibrium between ATP and ADP should shift in favor of ADP when the eelIs beeome more aetive. This has been clearly demonstrated on the Chinese erab Eriocheir sinensis (Wanson et al. 1983; Leray 1984). As shown in the histograms of Fig. , in the gills which are the most aetive in terms of NaCI transport.

All these results are eonsistent with an adenylate metabolism running optimally with a fairly low energy demand when erabs are maintained in seawater. In that medium, the hemolymph is isosmotic to the external surroundings and transport processes are switehed off (see Seet. 1). Conversely, in dilute media where the energy demand is inereased due to inereased transport aetivity of the posterior gills, the ATP produetion is un- A. Pequeux and R. sinensis ANT POST 12 10 [L o « -[L « ~ B 6 4 2 O~------~(S~W~KF~W~I--------~~- Fig.

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