| Different concentrations of ground water nitrate were obtained by drilling irrigation wells into two aquifers. |
| Dangerous concentrations can be released by agitation of stored liquid manure. |
| Arabidopsis plants were grown on agar containing a complete mineral complement and various concentrations of selenate and sulphate. |
| In most cases, such concentrations of atoms are so rarefied that the chances of colliding are infinitesimal. |
| At very high concentrations of poly-L-lysine and a large number of attached cells, the membranes rupture due to the adhesion-induced tension. |
| Most of the world's scientists agree that these increasing concentrations of carbon dioxide in the atmosphere are causing the Earth to warm. |
