Li, Yanjun, Dezhi Zhang, Ningyun Cai, Chao Han, Qian Mao, Ting Wang, Qian Zhou, Ning Chen, and Xixian Xie. 2019. “Betaine Supplementation Improved L-Threonine Fermentation of Escherichia Coli THRD by Upregulating Zwf (glucose-6-Phosphate Dehydrogenase) Expression”. Electronic Journal of Biotechnology 39 (May). Valparaíso, Chile. https://preprints.pucv.cl/index.php/ejbiotechnology/article/view/2019.03.004.