It is a fact that the borders have been semi-permeable for a long time.

Like a semi-permeable cell wall they only allow certain thoughts to pass through.

They have semi-permeable membranes, which allow water in but keep most of the salt out.

The movement of water by diffusion through a semi-permeable membrane.

By the 19th century it was accepted that some form of semi-permeable barrier must exist around a cell.

While both China and Vietnam appear open to trade from the rest of the world, the border they share is only semi-permeable, it seems.

Because the membrane of the cells is semi-permeable, certain ions cannot usually pass into the cell.

Osmosis is when water passes through a semi-permeable layer to reach equilibrium.

As the shell grew, the back compartments were sealed with a semi-permeable membrane.

A semi-permeable membrane allows solvent particles to pass in both directions.

Pre-cells would have had semi-permeable membranes, allowing only certain molecules to pass through.

Nitrox systems use semi-permeable membranes to separate out a portion of the nitrogen in air.

Each chloroplast is surrounded by a double walled semi-permeable membrane.

It is semi-permeable because some substances can penetrate it freely, whereas others cannot.

Reverse osmosis uses a semi-permeable membrane to separate water from dissolved salts.

Filter paper, a semi-permeable paper barrier placed perpendicular to a liquid or air flow.

These claims are not likely as the skin is only semi-permeable and is not able to conduct toxins out of the body.

It is generally fired at lower temperatures than either stoneware or porcelain, and can remain semi-permeable to water until glazed.

They surround cells and organelles with a semi-permeable barrier that prevents free flow of substances.

His body started the process automatically, exuding a transparent liquid that hardened into a tough semi-permeable membrane.

A vacuole is surrounded by a thin layer of cytoplasm which acts as a semi-permeable membrane.

This dressing should, in turn, be covered with a semi-permeable dressing to provide a barrier to vaccinia virus.

Products combining an absorbent base with an overlying semi-permeable layer can be used to cover the vaccination site.

The skin of the slug acts as a semi-permeable membrane where there are different concentrations of salt and water on each side.

Another example is in separation and mixing of gases, with use of chemically semi-permeable membranes.