BESSM, 2021, Vol 5, No 1, 1-6 - 1 - The Effect of Temperature on the Rate of Molybdenum Reduction by Enterobacter sp. strain Dr.Y13: Arrhenius Plot Analysis, Temperature Coefficient and Q10 Value Estimation Garba Uba 1 *, H.M. Yakasai 2 , Abba Babandi 2 , Murtala Ya’u 2 and Abdulrasheed Mansur 3 1 Department of Science Laboratory Technology, College of Science and Technology, Jigawa State Polytechnic, Dutse, PMB 7040, Nigeria. 2 Department of Biochemistry, College of Basic Medical science, Bayero University, Kano, PMB 3001- Nigeria. 3 Department of Microbiology, Faculty of Science, Gombe State University. *Corresponding author: Garba Uba Department of Science Laboratory Technology, College of Science and Technology, Jigawa State Polytechnic, Dutse, PMB 7040 Email: garbauba@jigpoly.edu.ng INTRODUCTION Our own activities are now putting our environment at jeopardy. Heavy industry, urbanization, and agriculture have all caused havoc on the environment as the world's population continues to rise. Natural resource overexploitation, as well as men's ignorance of natural rules, aggravate the problems. Pollution caused by hydrocarbons and metal ions has been rising throughout the globe in recent years. Metals and their compounds have been related to a range of acute and chronic toxicity cases in occupational and environmental high-exposure settings. Heavy metals are naturally present in the environment. Heavy metal levels have skyrocketed in recent years as a consequence of human activities dating back to pre-industrial times [1–6]. Toxins are being released into the environment in large and indiscriminate amounts in parallel with the increasing population and intensity of industry. When heavy metal levels exceed the critical load, it may have a negative effect on human health and biota. Arsenic, cadmium, chromium, cobalt, copper, lead, mercury, molybdenum, nickel, silver, and zinc are all toxic in their elemental forms and different combinations, and they are also non-biodegradable. Metal accumulation in the food HISTORY Received: 25 th May 2021 Received in revised form: 14 th of May 2021 Accepted: 18 th of June 2021 ABSTRACT Molybdenum is a micronutrient that is needed a co-factor for many hydroxylation and redox transfer activities in animal and plant physiology. The greatest risk of overexposure is its ability to interfere with the sperm production and egg-production processes in a variety of species, including fish. It is only beginning to be used as a remediation technique for molybdenum- reducing bacteria. Temperature is one of the factors that influence molybdenum reduction. Many models may be used to predict the growth rate of microorganisms on different medium, depending on the temperature. The Arrhenius model is popular because it has few parameters. Temperature generally affects microbial growth and metabolic activity on their substrates. The small nature of microbes makes them susceptible to change in surrounding temperature. Growth on molybdenum by Enterobacter sp. strain Dr.Y13 is described, with a discontinuous chevron- like graph of apparent activation energy with a breakpoint at 32.66 o C. Regression analysis results suggest that in the lower temperature range of 20-30 o C, growth on molybdenum had an activation energy of 62.09 kJ/mol, whereas at the higher temperature range of 37–45 o C, it had an activation energy of 65.05 kJ/mol. For the examined temperature range (20-30 o C) and (37- 45 o C), Q10 values of 2.32 and 2.21 and theta values of 1.09 and 1.08 were obtained, respectively. This is study is very useful in predicting the breakdown of molybdenum and the movement of molybdenum during bioremediation. Keywords molybdenum-reduction Enterobacter sp. strain Dr.Y13, temperature Arrhenius plot breakpoint BULLETIN OF ENVIRONMENTAL SCIENCE & SUSTAINABLE MANAGEMENT Website: http://journal.hibiscuspublisher.com/index.php/BESSM/index BESSM VOL 5 NO 1 2021 XENOBIOTICS-DEGRADING BACTERIUM