Comparative Study of Various <i>E. coli</i> Strains for Biohydrogen Production Applying Response Surface Methodology

<table>The response surface and contour plot of pH and formate concentration on hydrogen yield for <i>E. coli</i> (DJT 135).</table>

The Scientific World Journal

Figure 4: Comparative Study of Various <i>E. coli</i> Strains for Biohydrogen Production Applying Response Surface Methodology 