能量耗损相关底物消耗对微生物产率的影响

Effect of Substrate Consumption on Growth Yield *

根据底物反应平衡，提出在底物充分的条件下，微生物消耗的底物总量等于微生物生长所利用的量、微生物维持代谢所利用的量及由于能量代谢分离而消耗的量之和．由此，建立了描述在底物充分的条件下，微生物产率与剩余底物浓度相应关系的动力学模型，证明了观测到的产率随剩余底物浓度的增加而减少的现象．此模型能很好地与实验数据相符．结果表明随剩余底物浓度的增加，微生物的产率可下降７０％左右．

Based on a balance of substrate reaction,in this study,the total quantity of substrate consumed by microorganisms is taken to be the sums of the quantity of substrate utilization for grwoth,the quantity of substrate utilization for maintenance and that due to energy spilling.A kinetic model is proposed to describe the dependence of the observed grwoth yield on residual substrate concentration for substrate sufficient culture.It is demonstrated that the observed growth yield decreases with increasing the residual substrate concentration.This model describes the literature data satisfactorily.Results show that as the residual substrate concentration increased,the observed growth yield was reduced by more than 70%.