Crystalline Structures and Transitions of Poly(phthalazinone ether sulfone)/Monomer Casting Nylon 6 Composites

Huimei Yao,Yanping Wang,Chihua Chen,Jingrui Zhu,Xiaochun Xiao 한국고분자학회 2023 폴리머 Vol.47 No.4

The crystalline structures and transitions of poly(phthalazinone ether sulfone) (PPES)/monomer casting (MC) nylon 6 composites were studied by wide-angle X-ray diffraction (WXRD) and Fourier-transform infrared (FTIR) spectroscopy. WXRD analyses demonstrated that the γ-form crystals of quenched samples could transform into α-form crystals by raising the annealing temperature. And increasing the PPES content promoted the γ→α form transition, which was conducive to crystallizing in the stable α-form crystal. FTIR analyses indicated that the α-form crystals of the pristine samples could transform to γ-form crystals through treating with aqueous I2/KI. The inclusion of PPES to MC nylon 6 hindered the α→γ form transition, which was conducive to crystallizing in the stable α-form crystal. Two consistent observations have come from these studies: PPES favored the α-form crystal in PPES/MC nylon 6 composites. The crystalline transition mechanism was the strong interactions between PPES and MC nylon 6 anchored the antiparallel chains hydrogen bonding of the α-form crystal.

国际传播背景下韩国语课程思政教学模式的探索与实践

张会梅(Huimei Zhang),唐颖聪(Yingcong Tang) YIXIN 출판사 2023 教育教学研究论丛 Vol.1 No.5

立德树人是高校的根本任务,课程思政是落实立德树人的重要举措。随着中国文化“走出去”战略的提出,各大高校肩负起了非通用语种人才培养的重任,非通用语种的课程思政建设也显得尤为必要。在国际传播的大背景下,韩国语作为非通用语之一,也在课程思政建设方面取得了一定的成绩,但又面临着诸多问题和挑战。本研究以第二外语(韩国语)课程为例,调查其课程思政建设的现状,并挖掘课程中的思政元素,通过具体教学案例,探究第二外语(韩国语)课程思政建设的路径以及对课程思政建设的思考。为培养外语复合型人才,加强中韩两国文化交流和中国国际传播能力建设建言献策。 Cultivating talents with moral characters is the fundamental task of Chinese higher educational institutions (CHEIs), and curriculum-based ideological and political education is a key to accomplishing such a task. To help in implementing the national strategy of Chinese culture “going global”, CHEIs not only cultivate non-universal language talents but also make it mandatory to incorporate ideological and political construction into non-universal language courses. Notably, some achievements in ideological and political construction have been achieved in the teaching of the Korean language, a non-universal language for international communication. However, there are problems and challenges. Accordingly, this research takes the second foreign language (Korean) course as an example to investigate the current situation of ideological and political construction in its curriculum and explore the ideological and political elements in the course. Drawing on specific teaching cases, this study examines and reflects on how ideological and political construction is implemented in the second foreign language (Korean) course. The research findings of the study provide valuable implications for cultivating versatile talents in foreign languages, strengthening cultural exchanges between China and South Korea, and building China's international communication capabilities.

Influence of Aeolian Sand on Capillary Water Absorption of Concrete Under Freeze–Thaw Conditions

Yugen Li,Huimei Zhang,Shaojie Chen,Hairen Wang,Xiaoyu Liu,Wei Gao 한국콘크리트학회 2023 International Journal of Concrete Structures and M Vol.17 No.3

Aeolian sand (AS) can become a green resource for concrete after the reasonable utilization. Study the evolution of AS concrete (ASC) capillary water absorption (CWA) under freeze–thaw (FT) conditions is of great significance for its popularization and application. One-dimensional (1D) CWA test was performed to analyze the effects of AS and freeze–thaw cycling (FTC) on concrete water absorption characteristics. Pore relative saturation (PRS) and pore saturation were defined to reveal the influence mechanism of AS content on concrete water absorption under FT conditions and predict the moisture distribution in damaged ASC combining with the capillary mechanics theory. The results showed that concrete frost resistance increased with increased AS content and the optimal frost resistance achieved with 100% AS replacement despite its low strength. The initial water absorption rate (WAR), pore saturation, and saturation speed of the ASC decreased with increased AS, while the PRS increased with low AS content but decreased with excessive AS. The water absorption depth increased with increased mass and dynamic elastic modulus loss rates. The mechanism regarding why excessive AS improved concrete frost resistance lay in its internal pore structure and large pore ratio, which reduced pore content that can easily absorb water, enclosed a higher volume of air bubbles, and easily formed "air locking," thereby increasing water transmission resistance and forming long transmission paths during the process of CWA.

고급 한국어 학습자를 위한 선어말어미 ‘-시-’의 교육 방안 연구: '-시-'의 문법외적 용법을 중심으로-

김설, 장회매 忠北大學校 人文科學硏究所 2018 人文學誌 Vol.55 No.-

본문 참고

Multi-Discursive Ethnography and the Re-Narration of Chinese Heritage: Stories about the Yueju Opera Performance at the Heavenly Queen Palace of Quzhou

( Song Hou ),( Zongjie Wu ),( Huimei Liu ) 성균관대학교 동아시아학술원 2016 Sungkyun Journal of East Asian Studies Vol.16 No.2

Recognizing the discursive nature of heritage and its crisis of representation, this paper proposes to use what we call “multi-discursive ethnography” as a methodological and writing strategy to renarrate and thereby remake heritage in contemporary China. Multi-discursive ethnography, as its name indicates, is a form of ethnography that encompasses multiple discourses of a subject matter and strives to facilitate dialogue among them. Scholars are required to conduct fieldwork and other research procedures to expose them to varied discourses, and then write up an ethnography by assembling and weaving together those discourses they find useful for representing dialogue and diversity. As a case study, we present a multi-discursive ethnography of the Heavenly Queen Palace (Tianhou Gong 天后宮) in Quzhou (衢州), Zhejiang Province, focusing chiefly on the Yueju opera (越劇) performances that many local people attend. Stories are told there, allowing us to rethink and reconstruct heritage beyond disciplinary knowledge and universalized meaning-making. This multi-discursive ethnography, we argue, problematizes globalized heritage discourses and invites a diverse and dialogical reconceptualization of a local past in the present by foregrounding vernacular voices and deep cultural discourse, especially with regard to li (禮), which is considered to be “the determinate fabric of Chinese culture, and…the language through which the culture is expressed” (Hall and Ames 1998, 269).

Aqueous Extracts of Se-Enriched Auricularia auricular Exhibits Antioxidant Capacity and Attenuate Liver Damage in High-Fat Diet/Streptozotocin-Induced Diabetic Mice

Chunyan Wei,Jingjing Wang,Cuicui Duan,Huimei Fan,Xiaoxiao Liu 한국식품영양과학회 2020 Journal of medicinal food Vol.23 No.2

Oxidative stress triggered by hyperglycemia is thought to be a major factor in the development of liver disease during diabetes mellitus (DM). The aim of this study was to determine the antioxidant capacity of aqueous extracts of selenium-enriched Auricularia auricular (AESA) and further investigate the hepatic protection and potential mechanism of AESA in a mouse model of diabetes. An in vitro antioxidant assay confirmed that AESA exhibited better antioxidant capacity characterized by increased reducing power and scavenging capacity of free radicals, such as diphenyl picrylhydrazyl radical, hydroxyl radical, and superoxide radical. The diabetic model was induced by high-fat diet combined with a single injection of streptozotocin in C57BL/6 mice. Our results showed that AESA treatment improved diabetes-induced disorders of lipid metabolisms and alleviated liver damage in diabetic mice. Furthermore, the antioxidant enzyme activities of glutathione peroxidase and catalase in liver were increased and malondialdehyde level was decreased with AESA treatment compared with those in the DM group. In parallel, AESA significantly reduced the contents of tumor necrosis factor-alpha and interleukin-1beta in liver in comparison with the DM group. In addition, western blot results showed that the expression of receptor for advanced glycation end products (RAGE), phospho-c-Jun NH2-terminal kinase, phospho-extracellular signal-regulated kinase, and phospho-p38 kinase were remarkably decreased in AESA treatment group compared with DM group. Taken together, supplementation of AESA may effectively attenuate diabetic hepatopathology by exerting antioxidant function through the RAGE/mitogen-activated protein kinase pathway.

Genome-wide DNA methylation analysis in schizophrenia with tardive dyskinesia: a preliminary study

Zhang Ping,Lu Yongke,Li Yanli,Wang Kesheng,An Huimei,Tan Yunlong 한국유전학회 2023 Genes & Genomics Vol.45 No.10

Background Tardive dyskinesia (TD) develops in 20–30% of schizophrenia patients and up to 50% in patients > 50 years old. DNA methylation may play an important role in the development of TD. Objective DNA methylation analyses in schizophrenia with TD. Methods We conducted a genome-wide DNA methylation analysis in schizophrenia with TD using methylated DNA immunoprecipitation coupled with next-generation sequencing (MeDIP-Seq) in a Chinese sample including five schizophrenia patients with TD and five without TD (NTD), and five healthy controls. The results were expressed as the log2FC, fold change of normalized tags between two groups within the differentially methylated region (DMR). For validation, the pyrosequencing was used to quantify DNA methylation levels of several methylated genes in an independent sample (n = 30). Results Through genome-wide MeDIP-Seq analysis, we identified 116 genes that were significantly differentially methylated in promotor regions in comparison of TD group with NTD group including 66 hypermethylated genes (top 4 genes are GABRR1, VANGL2, ZNF534, and ZNF746) and 50 hypomethylated genes (top 4 genes are DERL3, GSTA4, KNCN, and LRRK1). Part of these genes (such as DERL3, DLGAP2, GABRR1, KLRG2, LRRK1, VANGL2, and ZP3) were previously reported to be associated with methylation in schizophrenia. Gene Ontology enrichment and KEGG pathway analyses identified several pathways. So far, we have confirmed the methylation of 3 genes (ARMC6, WDR75, and ZP3) in schizophrenia with TD using pyrosequencing. Conclusions This study identified number of methylated genes and pathways for TD and will provide potential biomarkers for TD and serve as a resource for replication in other populations.

The vertical distribution and temporal occurrence of three types of rice planthoppers in Shanghai

Wang Dongsheng,Wu Xiangwen,Yuan Yongda,Zhang Tianshu,Shen Huimei,Du Xingbin,Teng Haiyuan,Chang Xiaoli 한국곤충학회 2022 Entomological Research Vol.52 No.1

In this study, we investigated the dynamic occurrence and vertical distribution of three types of rice planthoppers (Nilaparvata lugens, Sogatella furcifera,and Laodelphax striatellus) in Shanghai, China. Our results showed that S. furcifera and L. striatellus infested the lower part of rice plants in the early development stage, S. furcifera and L. striatellus inhabited every part of rice in the middle development stage, and L. striatellus and N. lugens formicated in the upper part of the rice plant in the posterior development stage. The populations of rice planthoppers were larger in July and September, Where more than 600 adult and nymphal planthoppers, per a hundred hills of rice, were found in late July, and out of the 600, the majority were the nymphs of S. furcifera and L. striatellus. S. furcifera was mainly found from July to October, L. striatellus during the rice development, and N. lugens after September, during which their maximal individual number, per a hundred hills of rice, was 480, 220, less than 50, respectively. In addition, our results showed that adult rice planthoppers were mostly observed from late August to mid-October with the highest population being found during mid to late September. The adult S. furcifera, L. striatellus,andN. lugens were mostly observed in August and September, from August to October, and past mid-September, respectively. Moreover, the number of adult L. striatellus that were sticking to yellow sticky card was significantly higher than that of S. furcifera and N. lugens.

Analysis of transcriptomic profiles and physiological traits of exogenous 24-epibrassinolide alleviating salt stress in Atractylodes macrocephala Koidz.

Zhang Jianyun,Fang Huiyong,Jiang Jianming,Gu Xian,Zhao Huimei,Qiu Jinmiao,Wang Qian,Zheng Yuguang,Zheng Kaiyan 한국식물생명공학회 2024 Plant biotechnology reports Vol.18 No.1

Exogenous 24-epibrassinolide (24-epiBL) application is a preferred method for improving salt tolerance in plants. However, information about the effects of exogenous 24-epiBL application related to salt response in Atractylodes macrocephala Koidz. (AMK) has rarely been reported. Here, we aimed to investigate the effects of exogenous 24-epiBL (0.01 mg L−1) on enhancing salt tolerance in AMK seedlings under salt stress (5 g L−1 NaCl) based on seed germination experiments. Our results indicated that NaCl treatment suppresses AMK seed germination, while 24-epiBL treatment under nonstress and stress conditions had positive effects on plant seedling growth. Treatment with NaCl significantly inhibited radicle elongation and root activity to endure salt stress, and 24-epiBL treatment promoted growth and alleviated the damage to osmotic stress, ion stress sub- stances, and oxidative stress by regulating free proline (Pro) and soluble protein (SP) contents and enhancing soluble sugar (SS) conversion. Moreover, the expression of normal development process genes was affected, and differentially expressed genes (DEGs) in multiple pathways associated with amino acid metabolism, signal transduction, carbohydrate metabolism, and lipid metabolism were regulated under NaCl treatment. Further analysis of the AMK transcriptome profile revealed that exogenous 24-epiBL enhanced salt tolerance through hormone regulation and carbohydrate metabolism promotion, salt- responsive gene expression inhibition, and induction of pathways related to terpenoid and polyketide metabolism as well as pentose and glucuronate interconversions for plant growth promotion. Collectively, our findings successfully demonstrate that exogenous 24-epiBL plays a positive role in regulating the AMK response to salt stress, which provides potential genetic resources to improve salt tolerance in plants.

A green ultrasound-assisted enzymatic extraction method for efficient extraction of total polyphenols from Empetrum nigrum and determination of its bioactivities

Yuan Gao,Yutong Shi,Na Miao,Wenxin Xing,Cholil Yun,Shengfang Wang,Wenjie Wang,Huimei Wang 한국공업화학회 2022 Journal of Industrial and Engineering Chemistry Vol.109 No.-

In this study, a green and efficient ultrasound-assisted enzymatic extraction (UAEE) method was establishedfor total polyphenols (TPP) extraction from E. nigrum aerial parts. Fractional Factorial design (FFD)was initially implemented for the selection of significant parameters affecting TPP yield and then Box-Behnken design-response surface methodology (BBD-RSM) was employed to optimize the parameters. The optimum extraction conditions for UAEE were as follows: incubation temperature of 38.39 ℃, incubationtime of 3.39 h, tannase of 386.53 U/g of sample (U/g), and cellulase of 224.42 U/g. Under the optimumconditions, the TPP yield was 52.17 ± 0.39 mg/g, which was 1.62 and 1.73 times those of themethods of ultrasound-assisted extraction (UAE) and enzyme-assisted extraction (EAE), respectively. The crude extract was purified by HPD-600 microporous resin, and the purity was improved from8.11% to 22.56%. In addition, the results of antioxidant and antibacterial activity assays showed thatthe purified extract has stronger bioactivities in contrast with the crude extract. This study indicated thatUAEE was an effective technique for the extraction of TPP from the aerial parts of E. nigrum, and TPPextracted by this extraction method could be applied in pharmaceuticals, cosmetics, and food industries.