In other words, it should be permeable enough to allow for the absorption of nutrients and relatively impermeable against pathogens.

At zero effective stress soil has very little strength and layers of relatively impermeable soil may heave up due to the underlying water pressures.

PFC mixtures must be placed on top of a pavement that is structurally sound and relatively impermeable.

Compared with Gram-positive bacteria, Gram-negative bacteria are more resistant against antibiotics, because of their relatively impermeable cell wall.

Under the surface alluvium, a series relatively impermeable sedimentary units cap the petroleum-bearing formation.

The relatively impermeable clay layers trap ground water in the "confined aquifer" which, if tapped, supplies artesian wells.

The high pressures experienced by these organisms can cause the normally fluid cell membrane to become waxy and relatively impermeable to nutrients.

Capsules are relatively impermeable structures that cannot be stained with dyes such as India ink.

As a result of compaction, the clayey sediments comprising mudrocks are relatively impermeable.

The membrane is most permeable to K and relatively impermeable to other ions.