21. The transporters help facilitate the movement of water-soluble solutes through the lipid bilayer of biological membranes . 22. Some biologically occurring lipids do exhibit spontaneous curvature which could explain the shapes of biological membranes . 23. Biological membranes block pore formation when no ?-LTX receptors are present ( neurexin, latrophilin, PTP? ).24. In the case of ionic current across biological membranes , currents are measured from inside to outside. 25. Previous models of biological membranes included the Robertson Unit Membrane Model and the Davidson-Danielli Tri-Layer model. 26. They cause disruption of both biological membranes and artificial vesicles, particularly to those rich in phosphatidylcholine. 27. Most ion channels are formed of several identical or pseudo-identical monomers or domains, arranged symmetrically in biological membranes . 28. On the other hand, rises in temperature will likely result in the eventual permeability of the biological membranes . 29. If biological membranes were not fluid, it is hard to imagine how cells could live, grow, and reproduce. 30. The imaging of native biomolecules, biological membranes , and tissues is also a major topic for the nanobiology researchers.