My husband and I *love* to walk ...for hours and hours, and if we decide to go ahead with this potential trip - I'm going to need good shoes. These days, I have some reasonably good shoes for the most part - but they are 2-3 hour walking shoes, not necessarily good for 6+ hours of tromping around.
In cell biology, selective permeability is the property of a living cell membrane that allows the cell to control which molecules can pass through the membrane, moving into or out of the cell.
Adj. 1. permeable-allowing fluids or gases to pass or diffuse through; permeable membranes; rock that is permeable by water. leaky-permitting the unwanted passage of fluids or gases; a leaky roof; a leaky defense system.. permeable-allowing fluids or gases to pass or diffuse through; permeable membranes; rock that is permeable by water. leaky-permitting the unwanted passage of fluids or gases; a leaky roof; a leaky defense system.