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Yujiao Kan,Haiqiang Liu,Yongquan Yang,Yinsha Wei,Yizhen Yu,Ri Qiu,Yibo Ouyang 한국공업화학회 2022 Journal of Industrial and Engineering Chemistry Vol.114 No.-
Finding appropriate usage of waste printed circuit board (WPCB), a kind of electronic trash, is an importanttask from background of environment protection and waste management. Due to the intrinsic highhindrance barrier capability, recycled epoxy resin in rich source from WPCB gives opportunity for corrosionprotection of metals based on Two birds with one stone ideology. One stone in this ideology is to applywaste as resource, and two birds respectively indicate using PCB waste as valuable material and inhibitingmetal corrosion. In this paper, by combining biomimetics strategy, we adopt a three-step methodincluding anodic oxidation, hydrophobic treatment and infusion of composite containing epoxy resinfrom WPCB and dimethyl silicone oil to finally form WPCB based slippery liquid-infused porous surface(W-LIS). Morphology, composition, wettability and electrochemical properties are characterized bysophisticated techniques. Adding recycled hydrophobic/oleophilic epoxy resin from WPCB into oil phasecan effectively increase the barrier effect and raise anticorrosion ability. Moreover, W-LIS delivers antifreezingadhesion and biofouling inhibition property, which is obviously superior to LIS and lotus inspiredsuperhydrophobic (SHS) coating. The various excellent performances of W-LIS indicate epoxy resin fromwaste printed circuit board can act a versatile role in field of metal corrosion prevention.
glyA Gene Knock-out in Escherichia coli Enhances L-serine Production without Glycine Addition
Ya Zhang,Pei Kang,Shuang Liu,Yujiao Zhao,Zhiwen Wang,Tao Chen 한국생물공학회 2017 Biotechnology and Bioprocess Engineering Vol.22 No.4
In E. coli, glyA encodes for serine hydroxymethyltransferase (SHMT), which converts L-serine to glycine. When engineering L-serine-producing strains, it is therefore favorable to inactivate glyA to prevent L-serine degradation. However, most glyA knockout strains exhibit slow cell growth because of the resulting lack of glycine and C1 units. To overcome this problem, we overexpressed the gcvTHP genes of the glycine cleavage system (GCV), to increase the C1 supply before glyA was knocked out. Subsequently, the kbl and tdh genes were overexpressed to provide additional glycine via the L-threonine degradation pathway, thus restoring normal cell growth independent of glycine addition. Finally, the plasmid pPK10 was introduced to overexpress pgk, serAΔ197, serC and serB, and the resulting strain E4G2 (pPK10) accumulated 266.3 mg/L of L-serine in a semi-defined medium without adding glycine, which was 3.18-fold higher than the production achieved by the control strain E3 (pPK10). This strategy can accordingly be applied to disrupt the L-serine degradation pathway in industrial production strains without causing negative side-effects, ultimately making L-serine production more efficient.