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Structure and Properties of Konjac Glucomannan/Galactoglucomannan Nanofiber Membrane
Yi Yuan,Xin Hong,Ruojun Mu,Jingni Gong,Lin Wang,Rongxun Huang,Jiayu Wu,Yongsheng Ni,Xianhui Wu,Jie Pang 한국고분자학회 2017 Macromolecular Research Vol.25 No.10
Konjac glucomannan (KGM)/galactoglucomannan (GGM) nanofiber membranes were obtained through electrospinning technology. Rheological properties of KGM/GGM solutions were observed by using a rotary rheometer. The apparent morphological, characteristic group and thermal stability of nanofiber membranes were studied through scanning electron microscopy (SEM), Fourier transform infrared spectoscopy (FTIR) and differential scanning calorimeter (DSC) respectively. The physical and mechanical properties were also evaluated. Results revealed that the addition of GGM did not significantly affect the rheological properties of electrospinning solution. Increase in the amount of GGM in the nanofiber membrane resulted in gradual smoothening, uniformity and decrease in the number of nodes. KGM interacts with GGM through hydrogen-bond. Addition of GGM markedly enhanced the thermal stability, physical and mechanical properties of the nanofiber membrane. The study showed that the KGM/GGM nanofiber membrane have good potential for use in developing membrane based materials.
Yi Yuan,Baolin Liu,Hao Liu 한국지질과학협의회 2022 Geosciences Journal Vol.26 No.3
Dongting Lake is the second-largest freshwater lake in China. To better understand the geochemical characteristics of the sediment in different seasons and identify the possible provenance, 44 sediment samples collected from East Dongting Lake (ED Lake) in summer (ED-S) and winter (ED-W) were used for elemental geochemical analysis. Geochemically, the sediment samples are classified as shale, and the chondrite normalized rare earth element (REE) patterns of the ED-S and ED-W have light REE (LREE) enriched, flat heavy REE (HREE) patterns with a negative Eu anomaly. In the present study, the correlations between certain elements show that the variations in ΣREE contents in sediments may be due to the concentrations of heavy minerals like monazite, whereas grain size is not responsible for that variations. Chemical index of alteration (CIA), plagioclase index of alteration (PIA) values, A-CN-K diagram, and Th/U ratios of the ED-S and ED-W sediment indicate a moderate to high intensity of chemical weathering in the source area. The Al2O3/TiO2 ratio, discriminant function diagram, REE patterns, and elemental ratios indicate the contribution of sediments from felsic and intermediate source rocks. The provenance index (PI) based on REEs geochemical parameters suggest that elemental compositions of sediment in East Dongting Lake approach the Upper Yangtze River.
Yiyuan Wang,Baolun Yuan,Yanlu Yang 동북아경상학회 2023 동북아경상연구 Vol.4 No.1
Purpose - Based on the importance of collaborative innovation in solving existing problems in the Chinese coal industry, this study mainly studies the categories of influencing factors of collaborative innovation in the Chinese coal industry. Design/Methodology/Approach - Due to the deep vertical intersection and extensive horizontal correlation of existing problems in the Chinese coal industry, collaborative innovation in the Chinese coal industry requires the use of a ““full factor”” collaborative innovation method. This study mainly comprehensively sorts out and analyzes the categories of influencing factors that affect collaborative innovation in the Chinese coal industry from a theoretical perspective. Based on this, a “pyramid spiral” operational process model for all-factor collaborative innovation in ’China’s coal industry has been constructed. Findings - Through theoretical analysis and model construction, this paper finds that the influencing factors of collaborative innovation in ’China’s coal industry are mainly divided into objective resource factors, subjective willingness factors, mode selection factors, and operational mechanism factors. Objective resource factors include research personnel, research funds, research facilities, research policies, and achievement transformation channels; Subjective willingness factors include research environment, resource complementarity, interest-driven, value orientation, etc; The factors for mode selection include the characteristics of scientific research projects, the level of research participants, etc; And the operational mechanism factors include team formation mechanism, mode selection mechanism, knowledge sharing mechanism, and achievement evaluation mechanism. Research Implications - This study lays a the oretical foundation for empirical research on the mechanism of the influencing factors of collaborative innovation in the Chinese coal industry. Also, it provides reference for constructing the operational mechanism of collaborative innovation in the Chinese coal industry.
Yiyuan Wang,Yanlu Yang 동아시아무역학회 2023 Journal of East Asian Trade(JEAT) Vol.5 No.1
Purpose - Based on the highly coupled relationship between local college graduates’ localized employment and urban economic development, this paper mainly studies the willingness and influencing factors of local college graduates’ localized employment. Design/Methodology/Approach - Based on theoretical research, this paper takes R city in China as the specific research object. It uses a combination of academic research and empirical analysis methods to conduct a questionnaire survey on 306 students from four local universities in R city. A total of 231 valid questionnaires were collected, and the collected data was statistically analyzed using Spss.22. Findings - This paper found that there are significant differences in the willingness of local employment among students from different universities in R city. Factors such as understanding of employment policies, attractiveness of employment policies, natural environment, convenience of life, housing prices, levels, wage levels, urban development prospects, and employment opportunities affect the willingness of local university students in R city to work locally. Among them, the positive impact of urban development prospects is the most prominent, followed by the understanding of employment policies. The attractiveness of employment policies and convenience of life, while housing prices have had a negative impact. Research Implications - The research results of this article provide valuable references for local cities such as R city to formulate talent policies, attract talent aggregation, enhance the willingness of local university graduates to localize employment and build a virtuous cycle mechanism between education investment and economic output. R city should tell the future development story of the city well, formulate talent policies that are more conducive to talent aggregation without realizing the story, and better promote talent policies.
Yiyuan Xi,Soeun Kim,Thi Thanh Thuy Nguyen,Phil Jun Lee,Jujia Zheng,Zhuofeng Lin,Namki Cho 대한약학회 2023 Archives of Pharmacal Research Vol.46 No.10
A growing proportion of the global adult and pediatric populations are currently affected by nonalcoholic steatohepatitis (NASH), leading to rising rates of liver fibrosis and hepatocellular carcinoma without effective pharmacotherapy. Here, we investigated whether 2-geranyl-1-methoxyerythrabyssin II (GMET), isolated from Lespedeza bicolor, could alleviate lipid accumulation and inflammatory responses in a NASH model. GMET exhibited potent in vitro and in vivo effects against lipid accumulation and attenuated inflammatory responses without cytotoxicity. Mechanistically, GMET inhibits acetyl-CoA carboxylase (ACC), sterol regulatory element-binding proteins-1c (SREBP1), and mammalian target of rapamycin (mTOR), and activates PPARα by activating AMP-activated kinase (AMPK), leading to the alleviation of lipid accumulation. In addition, GMET suppresses the NF-κB pathway by activating AMPK and inhibiting the activated protein kinase B (AKT)/IκB-kinase (IKK) pathway, leading to the inhibition of the inflammatory response in hepatocytes. All these protective effects of GMET on lipid accumulation and inflammation in vivo and in vitro were largely abolished by co-treatment with dorsomorphin, an AMPK inhibitor. In conclusion, GMET alleviated lipid accumulation and inflammation to preserve normal hepatocyte function in steatohepatitis. Thus, GMET is a novel potential multi-targeting compound to improve steatohepatitis.