Effect of magnetite nanoparticles addition on modification of cobalamins production via Propionibacterium freudenreichii PTCC1674 using oily sludge of lubricant industry as the carbon source Rouhollah Hedayati; Morteza Hosseini; Ghasem Najafpour; Hosein Attar Volume 5, Issue 4, October 2020, Pages 342-357 10.22090/jwent.2020.04.005 View Article PDF 1.79 MB