Arrhenius Plot Analysis, Temperature Coefficient and Q10 Value Estimation for the Effect of Temperature on the Rate of Molybdenum Reduction by Acinetobacter calcoaceticus strain Dr Y12

  • Aisami Abubakar Department of Biochemistry, Faculty of Science, Gombe State University, Nigeria.
Keywords: molybdenum-reducing; Acinetobacter calcoaceticus strain Dr Y12; temperature; Arrhenius plot; breakpoint


Molybdenum is a micronutrient that is required as a co-factor for a variety of hydroxylation and redox transfer activities in both animal and plant physiological processes. The potential of overexposure to interfere with the sperm production and egg formation processes in several species, including fish, is the biggest danger of excessive exposure. Only recently has it been discovered that it can be utilised as a remediation method for molybdenum-reducing bacteria. The effect of temperature on molybdenum reduction is one of the variables to consider. It is possible to use many different models to estimate the growth rate of microbes on various media based on the temperature being utilised. The Arrhenius model is popular because it contains a limited number of parameters. In general, the temperature has an effect on the development and metabolic activity of microorganisms on their substrates. Because microorganisms are so tiny, they are very sensitive to changes in their environment's temperature. Growth on molybdenum by Acinetobacter calcoaceticus strain Dr Y12 is described, with a discontinuous chevron-like graph of apparent activation energy with a breakpoint at 32.66 oC. Regression analysis results suggest that in the lower temperature range of 20-30 oC, growth on molybdenum had an activation energy of 66.48 kJ/mol, whereas, at the higher temperature range of 37–45 oC, it had an activation energy of 99.5 kJ/mol. For the examined temperature range (20-30 oC) and (37-45 oC), Q10 values of 2.46 and 3.37 and theta values of 1.09 and 1.13 were obtained, respectively. This is study is very useful in predicting the breakdown of molybdenum and the movement of molybdenum during bioremediation.