| 摘要 |
<p>The invention discloses that, in the presence of NifA and NtrA, the expression of a desired DNA molecule which has been operably linked to an ntrA-RNA polymerase and NifA dependent promoter can be regulated by regulating the oxygen level of the culture medium. The invention relates to vectors which may be used in accordance with this discovery, and to methods for using such vectors.</p> |
