Fig. 6

Quantitative analysis of morphological changes. a Fractional difference in each of the independent and dependent variables vs. control. b Fractional change in \(k\cdot A\), \(\left( [Fe^{3+}]_{b}-[Fe^{3+}]_{s}\right)\) and r vs. control. The fractional change in \(k\cdot A\) shows the resultant effect of changes in morphology and was calculated from the following relationship: \(\left( 1+\Delta \left( k\cdot A\right) \right) =(1+\Delta k)\cdot (1+\Delta A)\). c Morphology effect ratio applied to the observed changes in EET rates between the nutritionally replete cells in the continuously diluted culture and the relatively nutrient limited cell in the control. The black dotted line at MER = 0.7311 is the value of MER when morphological and unknown physiological/metabolic effects on EET rates are equal