求翻译：当磁粉投加量为4g/L时，菌液OD600值在12h达到最大0.648，微生物生长最好。磁粉投加量小于4g/L时，随着磁粉加入量的增加，最大OD值逐渐增加，磁粉对微生物生长有促进作用；磁粉投加量高于4g/L时，随着磁粉加入量的增加，最大OD值反而逐渐降低，此时磁粉对微生物生长产生抑制作用。Lukas Fojt等[73]通过研究发现，在10mT的磁场强度下，E. coli， L. adecarboxylata 和 S. aureus三种细菌的CFU均有明显增加，说明磁场对这三种细菌的生长都具有促进作用，这与本论文研究结论相一致。。是什么意思？

When 4g/L is magnetic powder dosing quantity, solution OD600 value 12h maximum 0.648, microbial growth is best. Magnetic powder dosing when the volume is less than the 4g/L, with the increase in magnetic powder content, increasing maximum OD value, magnetic powder on the growth promoting microorganism; when magnetic powder dosing volume is higher than the 4g/L, with the increase in magnetic powder content, instead of gradually reducing the maximum OD value, inhibitory effect of magnetic powder on the growth of microorganisms. Lukas Fojt, [73] discovered through research, 10mT under the magnetic field strength, e. coli,L. adecarboxylata and s. aureus bacteria CFU has three significant increase in description field on the growth of these three types of bacteria have an effect, which is consistent with this thesis research conclusions ...