permeability reduction by bacteria plugging

Hi guys, Please, help me giving some directions about next: * Is there any way to determine suitable concentration or number of bacteria at reservoir in order to avoid microbial formation damage? * Is there any company or lab that works with bacteria cultures in cores? * Is there any guide to determine acceptable bacteria limit for reservoir conditions (pressure, temperature, residual oil, oil properties, permeability, pore throat size,…) and/or injection water quality? Any help would be highly appreciated. Hermes