中文摘要：

利用亚硝酸盐还原酶（Nir）降解发酵食品中产生的亚硝酸盐，是应对亚硝酸盐污染的根本对策。研究乳酸茵亚硝酸盐还原酶的分子调控机制，为进一步揭示乳酸茵n打操纵子调控系统的功能及模式元件的组合、新的调控模型和信号传导的分子调控机制奠定基础，对加快寻找安全有效的亚硝酸盐生物降解法，进而保障国家的食品安全具有重要意义。

英文摘要：

The utilization of Nitrite reductase （Nit） degradation in fermented food is the ultimate countermeasures to deal with the pollution of the nitrite. The study of the molecular regulation mecha- nism of nit in Lactic Acid Bacteria would establish the foundation of the functions of nir operon regu- lation system, the combination of mode components, and the molecular regulation mechanism of the new regulation model and the signal transduction of lactic acid bacteria for the further study. All these studies would be great significance for looking for a safe and effective control or degradation of nitrite by biodegradable method quickly and for guaranteeing the food security of our country.