But even here there are impermeable membranes between town and gown.

This is particularly of concern at the landfill site, which environmentalists state has no impermeable membrane present to prevent possible groundwater contamination by toxic waste.

However, the cell cannot be surrounded by an impermeable membrane, because it must acquire substances -'food'- from outside.

In general, insects adapted to arid environments also have an impermeable cuticular membrane that prevents water loss.

An impermeable membrane of force confined all the Jelman air and whatever Llurdan atmosphere had been mixed with it.

Some tablets are designed with an osmotically active core, surrounded by an impermeable membrane with a pore in it.

Between them, there is a bellow, which was originally made with rubber then replaced in the 1950s by an impermeable membrane.

It is disposable and contains about 2-4 m2 of a membrane permeable to gas but impermeable to blood, in the form of hollow fibers.

The needle provides a smooth passage through those highly selective and almost impermeable membranes.

She couldn't feel it strike her skin, it was as though she'd been wrapped in some impermeable membrane, mind suddenly disassociated from her body.