Construction of DOPA-SAM multilayers with corrosion resistance via controlled molecular self-assembly

Ting Chen,Ming Yang,Hui Yang,Ruining Wang,Shujuan Wang,Hang Zhang,Xiaoyu Zhang,Zhijuan Zhao,Jinben Wang 한국공업화학회 2019 Journal of Industrial and Engineering Chemistry Vol.69 No.-

Although nano “green” coatings with excellent corrosion resistance have attracted great attention, the inhibition efficiency is still limited due to the lack of knowledge about the correlation between molecular structure and anticorrosion performance. Here, we fabricated a series of 3,4-dihydroxy-l-phenylalanine adlayers on self-assembled monolayers (SAMs) with varying end groups. We found that both NH2 and CF3SAMs were more conducive to the adsorption of DOPA and a flat adsorption conformation was preferentially adopted, with the plane of the phenylene ring parallel to the surface via cation-π interactions or hydrophobic interactions, leading to a compact and dense adlayer. Such DOPA-SAM multilayers can effectively protect the substrate from corrosion by suppressing the diffusion of aggressive water and acid molecules as well as the electrodissolution of metals. The lowest corrosion current of adlayers reaches 6.96 μA cm−2 which is much lower than that of bare substrate and other anticorrosion surfaces reported previously. The results provide guidance on the design of green anticorrosion materials via selecting SAMs that bridge organic and metal interface.

The Adaptive EEMD Denoising Method based on Normalized Index Optimization for Near Infrared Spectra

Tong Liang,Zhao Xiaoyu,Sha Lijuan,Shao Hongbo,Zhao Ming 보안공학연구지원센터 2016 International Journal of Signal Processing, Image Vol.9 No.2

Genomic characterization and pathogenic study of two porcine reproductive and respiratory syndrome viruses with different virulence in Fujian, China

Xiukun Sui,Ting Xin,Xiaoyu Guo,Hong Jia,Ming Li,Xintao Gao,Jing Wu,Yitong Jiang,L.Willems2,Hongfei Zhu,Shaohua Hou 대한수의학회 2018 Journal of Veterinary Science Vol.19 No.3

Two strains of porcine reproductive and respiratory syndrome virus (PRRSV) were isolated in 2006 and 2016 and designated as FZ06A and FZ16A, respectively. Inoculation experiments showed that FZ06A caused 100% morbidity and 60% mortality, while FZ16A caused 100% morbidity without death. By using genomic sequence and phylogenetic analyses, close relationships between a Chinese highly pathogenic PRRSV strain and the FZ06A and FZ16A strains were observed. Based on the achieved results, multiple genomic variations in Nsp2, a unique N-glycosylation site (N33→K33), and a K151 amino acid (AA) substitution for virulence in the GP5 of FZ16A were detected; except the 30 AA deletion in the Nsp2-coding region. Inoculation experiments were conducted and weaker virulence of FZ16A than FZ06A was observed. Based on our results, a 30 AA deletion in the Nsp2-coding region is an unreliable genomic indicator of a high virulence PRRSV strain. The Nsp2 and GP5 differences, in addition to the virulence difference between these two highly pathogenic PRRSV strains, have the potential to be used to establish a basis for further study of PRRSV virulence determinants and to provide data useful in the development of vaccines against this economically devastating disease.

How Job Stress and Psychological Adaptation Predicting Interpersonal Needs Among Female Migrant Manufacturing Workers in China: A Structural Equation Model

Wang Rongxi,Yu Xiaoyue,Chen Hui,Hu Fan,XU CHENG,Liu Yujie,Liu Shangbin,Jin Lian,Li Ming,Cai Yong 한국산업안전보건공단 산업안전보건연구원 2023 Safety and health at work Vol.14 No.2

Background: This study aimed to explore relationships between job stress and psychological adaptation and how they related to interpersonal needs through mood states among female migrant manufacturing workers. Methods: A cross-sectional survey was conducted in 16 factories in Shenzhen, China. Sociodemographic, job stress, psychological adaptation and other psychological information of was collected. Structural equation modeling was performed to delineate the internal relationship between variables. Results: The hypothetical structural equation model exhibited acceptable model fit among female migrant manufacturing workers (c2 ¼ 11.635, df ¼ 2, c2/df ¼ 5.82, p ¼ 0.003, RMSEA ¼ 0.090, CFI ¼ 0.972, SRMR ¼ 0.020). Job stress was directly associated with mood states and interpersonal needs; Psychological adaptation was directly associated with mood states and indirectly associated with interpersonal needs; Bootstrapping tests demonstrated mediation effect of mood states in the way from psychological adaptation to interpersonal needs. Conclusion: Female migrant manufacturing workers who suffered stress from job and the process of psychological adaptation may have worse mood states and workers with worse mood states are more likely to develop unmet interpersonal needs, a proximal factor of suicidal ideation.

Effects of Exogenous Organic Acids on the Growth and Antioxidant System of Cosmos bipinnatus under Cadmium Stress

Jiani Hu,Xinyi Gao,Yajie Yue,Xiaoyu Ming,Linjie Yue,Lijuan Yang,Xue Xiao,Xiaofang Yu 한국원예학회 2022 원예과학기술지 Vol.40 No.5

Cadmium pollution in China’s urban green spaces is extremely severe, causing a significant increase in the risk of urban environmental pollution. Applying organic acids under Cd stress conditions improves the activity of the major antioxidant enzymes in the AsA-GSH cycle signi- ficantly. In this study, Cosmos bipinnatus seedlings were cultured in a nutritive medium containing 40 µmol·L-1 Cd. They were subsequently supplemented with different concentrations of citric acid and malic acid (0, 0.5, 1.0, 2.0 mmol L-1 ) to analyze the roles of the organic acids in regulating the AsA-GSH cycle involved in plant resistance to Cd stress. Exogenous organic acids inhibited the growth of C. bipinnatus in a dose-dependent manner. AsA, GSH, and GR in the leaves decreased dramatically at high malic acid concentrations (2 mol L-1 ). The contents of GSH and GR and the APX activities showed a downward trend when the seedlings were treated with 0.5–2 mmol·L-1 of citric acid. However, AsA exhibited contrasting results under these conditions. Notably, both the antioxidant and enzyme activities were reduced considerably to a minimum when the citric acid concentration was 2 mmol·L-1 . Low concentrations of exogenous acids increased the activities of APX and GR in the leaves of C. bipinnatus, thus increasing the contents of ASA and GSH. Such increases boost the efficiency of the ASA-GSH cycle in relieving the toxic effect of cadmium on C. bipinnatus. Cadmium pollution in China’s urban green spaces is extremely severe, causing a significant increase in the risk of urban environmental pollution. Applying organic acids under Cd stress conditions improves the activity of the major antioxidant enzymes in the AsA-GSH cycle signi- ficantly. In this study, Cosmos bipinnatus seedlings were cultured in a nutritive medium containing -1 40 µmol·L Cd. They were subsequently supplemented with different concentrations of citric acid -1 and malic acid (0,0.5,1.0,2.0 mmol L ) to analyze the roles of the organic acids in regulating the AsA-GSH cycle involved in plant resistance to Cd stress. Exogenous organic acids inhibited the growth of C. bipinnatus in a dose-dependent manner. AsA, GSH, and GR in the leaves decreased -1 dramatically at high malic acid concentrations (2 mol L ). The contents of GSH and GR and the -1 APX activities showed a downward trend when the seedlings were treated with 0.5–2 mmol·L of citric acid. However, AsA exhibited contrasting results under these conditions. Notably, both the antioxidant and enzyme activities were reduced considerably to a minimum when the citric acid -1 concentration was 2 mmol·L . Low concentrations of exogenous acids increased the activities of APX and GR in the leaves of C. bipinnatus, thus increasing the contents of ASA and GSH. Such increases boost the efficiency of the ASA-GSH cycle in relieving the toxic effect of cadmium on C. bipinnatus.

Tuning Molecular Composition for Better Cross-section Homogeneity of Thermal Oxidative Stabilized Polyacrylonitrile for Carbon Materials

Shiyu Liu,Yuan Ge,Baijun Liu,Zhongyu Fu,Xiaoyu Yu,Ming Yao Zhang,Hui Xuan Zhang 한국섬유공학회 2022 Fibers and polymers Vol.23 No.6

A strategy to improve the cross-section homogeneity of thermal oxidative stabilized polyacrylonitrile for carbonmaterials was provided in the present work. A kind of comonomer, dimethyl itaconate (DMI), which possesses two bulkyside groups was introduced into poly(acrylonitrile-co-itaconic acid). The efficiency of DMI in improving the cross-sectionhomogeneity of polyacrylonitrile films during thermal oxidative stabilization (TOS) processes and the properties of resultedPAN-based carbon materials were investigated in detail. It was found that DMI facilitated the formation of longer cyclicstructures, higher oxygen content, more homogeneous cross-section fracture morphology and denser structure during TOSprocess. DMI was also benefit for easing heat release. The presence of DMI also facilitated a smaller ID/IG value of thecarbonized PAN film and a bigger in-plane size of graphite crystals La.