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Zhi Chai,Zhen-Yu Li,Ling Wang,Lan Yang,Xiao-Ling Cheng,Xue-Mei Qin 한국식품영양과학회 2024 Journal of medicinal food Vol.27 No.1
Astragali Radix (AR) or its extract has been used as an herbal medicine and dietary supplement in China,Europe, and the United States. The gut microbiota could provide new insights for exploring dietary supplements’ underlyingmechanism on organisms. However, no reports have focused on the regulatory effect of AR on the gut microbiota as a dietarysupplement. In this study, healthy ICR mice of either sex were divided into AR and control (CON) groups and given AR waterextract (4.55 mg/kg$day-1) or saline by gavage for 14 days, respectively. Then 16S rRNA gene sequencing and ultra-highperformanceliquid chromatography quadrupole time-of-flight tandem mass spectrometry-based fecal metabolomics wereintegrated to investigate the benefits of dietary AR. Weighted gene coexpression network analysis was also introduced toinvestigate the metabolites with highly synergistic changes. AR supplementation influenced the structure of intestinal microflora,especially enriching short-chain fatty acid-producing bacteria g_Coprobacillus, g_Prevotella, and g_Parabacteroides. AR also significantly altered the fecal metabolome, mainly related to amino acid metabolism, nucleotidemetabolism, and bile acid (BA) metabolism. Moreover, the increased secondary BAs and BA-sulfates might closely relate tointestinal microflora. These findings provide valuable insights for future research of dietary AR as a functional food.
Assessing multidimensional students’ perceptions of twenty-first-century learning practices
Ching Sing Chai,Feng Deng,Pei-Shan Tsai,Joyce Hwee Ling Koh,Chin-Chung Tsai 서울대학교 교육연구소 2015 Asia Pacific Education Review Vol.16 No.3
This study attempts to design a survey to assess students’ perceptions of twenty-first-century learning practices in their classrooms and the resulting knowledge creation self-efficacy among the students. In addition, it also explores the relationships among the various dimensions of twenty-first-century learning practices. Four hundred and eighty-two primary school students from a Singapore school that focuses on the pervasive use of ICT within its school curriculum responded to the survey. The validation of the survey yielded satisfactory reliability and validity through both exploratory and confirmatory factor analyses. The results also showed that the subscales that survey students’ perceptions of critical thinking, creative thinking, and authentic problem-solving were more dominant predictors of their knowledge creation efficacy as compared to their perceptions about the learning processes.
Ag-W18O49-GO Nanocomposite as Highly Effective Antibacterial Agent with Capturing-Killing Mechanism
Le Xu,Linge Chai,Zhao Li,Xiaokun Jin,Danxia Gu,Xueting Chang,Shibin Sun 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2017 NANO Vol.12 No.12
In this work, a novel nanocomposite (NC) based on the decoration of Ag nanoparticles (NPs) and W18O49 nanorods (NRs) on the GO surfaces was prepared using combined techniques of solvothermal method and photochemical process. Compared with the Ag-GO NC, the Ag-W18O49-GO NC exhibited enhanced long-term antibacterial activity against the bacterium of Bacillus sp.1NLA3E (Bacillus sp.). The antibacterial mechanisms of both the Ag-GO and Ag-W18O49-GO NCs were distinctly revealed by observation of the direct interaction between the Ag NPs,W18O49 NRs, or GO sheets and the bacterial cells. Results showed that the GO sheets in the NCs mainly acted as supports for trapping or wrapping the bacterial cells, and it was the Ag NPs or W18O49 NRs grown on the GO surfaces that caused direct damage to the cells. The synergistic effects between the Ag NPs or W18O49 NRs and the GO sheets resulted in the prominent long-term antibacterial effect of the Ag-W18O49-GO NC. This work provides in-depth understanding of the mechanism regarding the antibacterial activity of the GO-based NCs.
Shahanaz Sultana,Chai Ling Ho,Suhaimi Napis,Veronika,Parameswari Namasivayam 한국작물학회 2014 Journal of crop science and biotechnology Vol.17 No.4
9-Cis-epoxycarotenoid dioxygenase (NCED) is an important enzyme which catalyzes the oxidative cleavage of abscisic acid(ABA), a plant growth regulator which plays a vital role in stress tolerance. In this study, a cDNA sequence encoding NCED from amangrove plant (Acanthus ebracteatus) was analyzed and overexpressed in rice. Analysis of the deduced amino acid sequence ofAeNCED revealed an open reading frame of 1,638 bp encoding a protein of 545 amino acids, with a 123 bp 5’-untranslated region(UTR) and a 259 bp 3’-UTR. The deduced amino acid sequence of AeNCED is more than 80% identical to the amino acid sequencesof carotenoid cleavage dioxygenase from carrot, tomato, and coffee. The RNA encoding AeNCED was detected in transgenic rice(Oryza sativa cv. BRRI dhan29) plants overexpressing this cDNA. These plants only showed significantly higher tolerance to salinityat germination and better performance at seedling stages. The levels of ABA in transgenic rice seedlings overexpressing AeNCEDtreated with 100 mM NaCl for 24 hours were higher than those of untransformed plants. However, a higher level of dihydrophaseicacid (DPA) and ABA glucose ester (ABA-GE) were also observed in these transgenic plants suggesting that rapid degradation ofABA through a self-regulation mechanism
Li Wenlong,Wang Lianshan,Chai Ruohao,Wen Ling,Lu Haixia,Wang Huanhua,Yang Shaoyan,Sun Wenhong 한국물리학회 2022 Current Applied Physics Vol.39 No.-
Semipolar (1122) GaN epitaxial films were grown on m-plane sapphire substrates by metal-organic chemical vapor deposition and additional high-temperature nitridation was introduced during the growth. The growth mechanism, surface microtopography, and the full width at half maximum (FWHM) of X-ray rocking curves (XRCs) of on-axis and off-axis (1122) GaN planes were investigated. The results demonstrate that additional high-temperature nitridation process could reduce surface roughness and anisotropy, and suppress the other orientations, and partially improve the crystalline quality of (1122) GaN epitaxial films. The XRCs FWHM of the off-axis (1122) GaN planes decrease and show a different varying tendency after additional high-temperature nitridation process associated with the partial dislocations and basal plane stacking faults (BSFs). The results of the modified Williamson-Hall (W–H) analysis and photoluminescence spectrum show the BSFs increased while the partial dislocations decreased after an additional high-temperature nitridation process. The improvement of crystalline quality was mainly correlated to the reduction of partial dislocations.