This results in a higher concentration of iron and other refractory materials reaching the surface.

When the concentration reaches a level of 200 rag.

When the concentrations of carbon monoxide in a room reach a critical level, death usually results in about two minutes.

It still isn't, given that the concentration of political power in the hands of the executive branch has reached extreme levels.

If their concentration reaches about 180-200 molecules per million molecules of air, the ice age on the earth will set in.

The highest concentrations, occurring in northern Europe, would reach more than triple background levels.

There are natural mechanisms for reassimilating them, and their concentrations have thus reached low equilibrium levels.

The Ca concentration of the vacuole may reach millimolar levels.

When the buildup became public two weeks ago, the concentration had reached 30,000 and Iraq was inviting observers to the scene.

This allows a higher concentration of chemotherapy to reach tumors in the lungs.