Microaerophiles are organisms that use oxygen , but only low concentrations -LRB- low micromolar range -RRB- ; their growth is inhibited by normal oxygen concentrations -LRB- approximately NUMBER@1 micromolar -RRB- .

Microaerophiles are organisms that may use oxygen , but only at low concentrations -LRB- low micromolar range -RRB- ; their growth is inhibited by normal oxygen concentrations -LRB- approximately NUMBER@1 micromolar -RRB- .
