The eggs of the freshwater fish Epiplatys dageti have tight plasma membranes without intramembranous particles |
| |
Authors: | Niels-Christian Jørgensen Henning Schmalbruch |
| |
Institution: | (1) Zoophysiological Laboratory B, August Krogh Institute, University of Copenhagen, Denmark;(2) Institute of Neurophysiology, Panum Institute, University of Copenhagen, Denmark;(3) Zoophysiological Laboratory B, August Krogh Institute, Universitetsparken 13, DK-2100 Copenhagen O, Denmark |
| |
Abstract: | Summary The plasma membrane of fish (Epiplatys dageti) eggs, which are capable of developing in salt-free water despite intracellular osmolarity corresponding to a pressure gradient of 7 to 8 atmospheres, is almost devoid of intramembrane particles. The specific membrane resistance is at least 3 orders of magnitude larger than that of nerve or muscle cells of different species indicating that the membrane is tight. These findings support the view that intramembranous particles are involved in transmembrane transport of ions, and indicate that the ionic concentration gradient in this cell is maintained by a tight membrane rather than by active transport. |
| |
Keywords: | Egg Cell membrane High-resistance membrane Freeze-fracture Epiplatys dageti |
本文献已被 PubMed SpringerLink 等数据库收录! |
|