Search

Your search keyword '"Liu, Zewen"' showing total 958 results
Start Over Author "Liu, Zewen"
958 results on '"Liu, Zewen"'

107. Controllable Fabrication and Rectification of Bipolar Nanofluid Diodes in Funnel-Shaped Si3N4 Nanopores

Author

Lei, Xin (author), Zhang, Jiayan (author), Hong, H. (author), Wei, Jiangtao (author), Liu, Zewen (author), Jiang, Lei (author), Lei, Xin (author), Zhang, Jiayan (author), Hong, H. (author), Wei, Jiangtao (author), Liu, Zewen (author), and Jiang, Lei (author)

Abstract

Solid-state nanopores attract widespread interest, owning to outstanding robustness, extensive material availability, as well as capability for flexible manufacturing. Bioinspired solid-state nanopores further emerge as potential nanofluidic diodes for mimicking the rectification progress of unidirectional ionic transport in biological K+ channels. However, challenges that remain in rectification are over-reliance on complicated surface modifications and limited control accuracy in size and morphology. In this study, suspended Si3N4 films of only 100 nm thickness are used as substrate and funnel-shaped nanopores are controllably etched on that with single-nanometer precision, by focused ion beam (FIB) equipped with a flexibly programmable ion dose at any position. A small diameter 7 nm nanopore can be accurately and efficiently fabricated in only 20 ms and verified by a self-designed mathematical model. Without additional modification, funnel-shaped Si3N4 nanopores functioned as bipolar nanofluidic diodes achieve high rectification by simply filling each side with acidic and basic solution, respectively. Main factors are finely tuned experimentally and simulatively to enhance the controllability. Moreover, nanopore arrays are efficiently prepared to further improve rectification performance, which has great potential for high-throughput practical applications such as extended release of drugs, nanofluidic logic systems, and sensing for environmental monitoring and clinical diagnosis., Green Open Access added to TU Delft Institutional Repository 'You share, we take care!' - Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public., Electronic Components, Technology and Materials

Published
2023
Full Text
View/download PDF

108. Study on the controllability of the fabrication of single-crystal silicon nanopores/nanoslits with a fast-stop ionic current-monitored TSWE method

Author

Hong, H. (author), Wei, Jiangtao (author), Lei, Xin (author), Chen, Haiyun (author), Sarro, Pasqualina M (author), Zhang, Kouchi (author), Liu, Zewen (author), Hong, H. (author), Wei, Jiangtao (author), Lei, Xin (author), Chen, Haiyun (author), Sarro, Pasqualina M (author), Zhang, Kouchi (author), and Liu, Zewen (author)

Abstract

The application of single-crystal silicon (SCS) nanopore structures in single-molecule-based analytical devices is an emerging approach for the separation and analysis of nanoparticles. The key challenge is to fabricate individual SCS nanopores with precise sizes in a controllable and reproducible way. This paper introduces a fast-stop ionic current-monitored three-step wet etching (TSWE) method for the controllable fabrication of SCS nanopores. Since the nanopore size has a quantitative relationship with the corresponding ionic current, it can be regulated by controlling the ionic current. Thanks to the precise current-monitored and self-stop system, an array of nanoslits with a feature size of only 3 nm was obtained, which is the smallest size ever reported using the TSWE method. Furthermore, by selecting different current jump ratios, individual nanopores of specific sizes were controllably prepared, and the smallest deviation from the theoretical value was 1.4 nm. DNA translocation measurement results revealed that the prepared SCS nanopores possessed the excellent potential to be applied in DNA sequencing. [Figure not available: see fulltext.], Electronic Components, Technology and Materials

Published
2023
Full Text
View/download PDF

109. Teaching Dilemmas and Incentive Strategies of University Young Teachers: An Expectancy Theory Perspective

Author

Peng, Xueyan, Liu, Zewen, Wang, Fengting, Peng, Xueyan, Liu, Zewen, and Wang, Fengting

Abstract

As an important academic human resource in universities, young teachers undertake the responsibility of cultivating innovative talents for the country. From the perspective of expectancy theory, this study analyzes the teaching dilemmas of young teachers in universities from three aspects: expectancy, valence, and instrumentality. Based on results, specific suggestions are proposed to stimulate the teaching enthusiasm of young teachers, including establishing a scientifically reasonable assessment system to balance the relationship between teaching and research; optimizing the salary and welfare system of young teachers to motivate their teaching initiative; and enriching training and development programs for young teachers to enhance their teaching abilities. Keywords: teaching; incentive; expectation; young teachers DOI: 10.7176/JEP/14-18-11 Publication date:June 30th 2023

Published
2023

110. Correction: Study on the controllability of the fabrication of single-crystal silicon nanopores/nanoslits with a fast-stop ionic current-monitored TSWE method (Microsystems & Nanoengineering, (2023), 9, 1, (63), 10.1038/s41378-023-00532-0)

Author

Hong, H. (author), Wei, Jiangtao (author), Lei, Xin (author), Chen, Haiyun (author), Sarro, Pasqualina M (author), Zhang, Kouchi (author), Liu, Zewen (author), Hong, H. (author), Wei, Jiangtao (author), Lei, Xin (author), Chen, Haiyun (author), Sarro, Pasqualina M (author), Zhang, Kouchi (author), and Liu, Zewen (author)

Abstract

Correction to: Microsystems & Nanoengineering published online 16 May 2023 Correction Following publication of the original article1, it was noticed that the phrase ‘DNA sequencing’ is incorrect, which should be replaced by ‘biosensing’. The original paper has been updated., Electronic Components, Technology and Materials

Published
2023
Full Text
View/download PDF

111. A Fast Algorithm for Image Defogging

Author

He, Xiaoyan, Mao, Jianxu, Liu, Zewen, Zhou, Jiujiang, Hua, Yajing, Junqueira Barbosa, Simone Diniz, Series editor, Chen, Phoebe, Series editor, Cuzzocrea, Alfredo, Series editor, Du, Xiaoyong, Series editor, Filipe, Joaquim, Series editor, Kara, Orhun, Series editor, Kotenko, Igor, Series editor, Sivalingam, Krishna M., Series editor, Ślęzak, Dominik, Series editor, Washio, Takashi, Series editor, Yang, Xiaokang, Series editor, Li, Shutao, editor, Liu, Chenglin, editor, and Wang, Yaonan, editor

Published
2014
Full Text
View/download PDF

112. Two Point Mutations in CYP4CE1Promoter Contributed to the Differential Regulation of CYP4CE1Expression by FoxO between Susceptible and Nitenpyram-Resistant Nilaparvata lugens

Author

Zhang, Huihui, Lin, Xumin, Yang, Baojun, Zhang, Lingchun, and Liu, Zewen

Abstract

Four P450s were reported to be important for imidacloprid resistance in Nilaparvata lugens, a major insect pest on rice, which was confirmed in this study in an imidacloprid-resistant strain (ImiR). Here we found that only two (CYP4CE1and CYP6ER1) from these four P450 genes were overexpressed in a nitenpyram-resistant strain (NitR) when compared to a susceptible strain (SUS). CYP4CE1RNAi reduced nitenpyram and imidacloprid resistance in NitR and ImiR strains, with a greater reduction in nitenpyram resistance. The transcription factor FoxO mediated nitenpyram resistance in NitR and ImiR strains, but it was not differentially expressed among strains. The potential reason for the differential regulation of FoxO on CYP4CE1expression was mainly from sequence differences in the CYP4CE1promoter between susceptible and resistant insects. In six FoxO response elements predicted in the CYP4CE1promoter, the single-nucleotide polymorphisms were frequently detected in over 50% of NitR and ImiR individuals. The luciferase reporter assays showed that two mutations, −650T/G and −2205T/A in two response elements at the positions of −648 and −2200 bp, mainly contributed to the enhanced regulation on CYP4CE1expression by FoxO in resistant insects. The frequency was over 69% for both −650T/G and −2205T/A detected in NitR and ImiR individuals but less than 20% in SUS insects. In conclusion, CYP4CE1overexpression importantly contributed to nitenpyram resistance in N. lugens, and two mutations in the CYP4CE1promoter of resistant insects led to an enhanced regulation on CYP4CE1expression by FoxO.

Published
2024
Full Text
View/download PDF

118. Mutations in troABCD against Copper Overload in a copA Mutant of Streptococcus suis

Author

Yang, Xia, primary, Peng, Wei, additional, Wang, Yanna, additional, Yan, Kang, additional, Liu, Zewen, additional, Gao, Ting, additional, Yang, Keli, additional, Liu, Wei, additional, Guo, Rui, additional, Li, Chang, additional, Chen, Huanchun, additional, Tian, Yongxiang, additional, Zhou, Danna, additional, Bei, Weicheng, additional, and Yuan, Fangyan, additional

Published
2023
Full Text
View/download PDF

121. Correction: Electrical characteristics and photodetection mechanism of TiO2/AlGaN/GaN heterostructure-based ultraviolet detectors with a Schottky junction

Author

Zhan, Teng, primary, Sun, Jianwen, additional, Feng, Tao, additional, Zhang, Yulong, additional, Zhou, Binru, additional, Zhang, Banghong, additional, Wang, Junxi, additional, Sarro, Pasqualina M., additional, Zhang, Guoqi, additional, Liu, Zewen, additional, Yi, Xiaoyan, additional, and Li, Jinmin, additional

Published
2023
Full Text
View/download PDF

122. Electrical characteristics and photodetection mechanism of TiO2/AlGaN/GaN heterostructure-based ultraviolet detectors with a Schottky junction

Author

Zhan, Teng, primary, Sun, Jianwen, additional, Feng, Tao, additional, Zhang, Yulong, additional, Zhou, Binru, additional, Zhang, Banghong, additional, Wang, Junxi, additional, Sarro, Pasqualina M., additional, Zhang, Guoqi, additional, Liu, Zewen, additional, Yi, Xiaoyan, additional, and Li, Jinmin, additional

Published
2023
Full Text
View/download PDF

129. Minimum Latency Data Aggregation in Wireless Sensor Network with Directional Antenna

Author

Liu, Hui, Liu, Zewen, Du, Hongwei, Li, Deying, Lu, Xianling, Hutchison, David, Series editor, Kanade, Takeo, Series editor, Kittler, Josef, Series editor, Kleinberg, Jon M., Series editor, Mattern, Friedemann, Series editor, Mitchell, John C., Series editor, Naor, Moni, Series editor, Nierstrasz, Oscar, Series editor, Pandu Rangan, C., Series editor, Steffen, Bernhard, Series editor, Sudan, Madhu, Series editor, Terzopoulos, Demetri, Series editor, Tygar, Doug, Series editor, Vardi, Moshe Y., Series editor, Weikum, Gerhard, Series editor, Wang, Weifan, editor, Zhu, Xuding, editor, and Du, Ding-Zhu, editor

Published
2011
Full Text
View/download PDF

130. Approximation Algorithms for Minimum Energy Multicast Routing with Reception Cost in Wireless Sensor Networks

Author

Li, Deying, Liu, Zewen, Hong, Yi, Chen, Wenping, Hutchison, David, Series editor, Kanade, Takeo, Series editor, Kittler, Josef, Series editor, Kleinberg, Jon M., Series editor, Mattern, Friedemann, Series editor, Mitchell, John C., Series editor, Naor, Moni, Series editor, Nierstrasz, Oscar, Series editor, Pandu Rangan, C., Series editor, Steffen, Bernhard, Series editor, Sudan, Madhu, Series editor, Terzopoulos, Demetri, Series editor, Tygar, Doug, Series editor, Vardi, Moshe Y., Series editor, Weikum, Gerhard, Series editor, Wang, Weifan, editor, Zhu, Xuding, editor, and Du, Ding-Zhu, editor

Published
2011
Full Text
View/download PDF

134. Metabolomics and proteomics analyses revealed mechanistic insights on the antimicrobial activity of epigallocatechin gallate against Streptococcus suis

Author

Gao, Ting, primary, Ye, Fei, additional, Tan, Yiqing, additional, Peng, Mingzheng, additional, Yuan, Fangyan, additional, Liu, Zewen, additional, Zhou, Danna, additional, Yang, Keli, additional, Liu, Wei, additional, Guo, Rui, additional, Zhang, Tengfei, additional, Zheng, Lin, additional, Zhou, Rui, additional, and Tian, Yongxiang, additional

Published
2022
Full Text
View/download PDF

143. Tea Polyphenols Protects Tracheal Epithelial Tight Junctions in Lung during Actinobacillus pleuropneumoniae Infection via Suppressing TLR-4/MAPK/PKC-MLCK Signaling.

Author

Li, Xiaoyue, Liu, Zewen, Gao, Ting, Liu, Wei, Yang, Keli, Guo, Rui, Li, Chang, Tian, Yongxiang, Wang, Ningning, Zhou, Danna, Bei, Weicheng, and Yuan, Fangyan

Subjects
*ACTINOBACILLUS, *ACTINOBACILLUS pleuropneumoniae, *TIGHT junctions, *POLYPHENOLS, *COMMUNICABLE diseases, *LUNGS, *DRUG resistance in microorganisms, *CLASSICAL swine fever, *PORCINE reproductive & respiratory syndrome
Abstract

Actinobacillus pleuropneumoniae (APP) is the causative pathogen of porcine pleuropneumonia, a highly contagious respiratory disease in the pig industry. The increasingly severe antimicrobial resistance in APP urgently requires novel antibacterial alternatives for the treatment of APP infection. In this study, we investigated the effect of tea polyphenols (TP) against APP. MIC and MBC of TP showed significant inhibitory effects on bacteria growth and caused cellular damage to APP. Furthermore, TP decreased adherent activity of APP to the newborn pig tracheal epithelial cells (NPTr) and the destruction of the tight adherence junction proteins β-catenin and occludin. Moreover, TP improved the survival rate of APP infected mice but also attenuated the release of the inflammation-related cytokines IL-6, IL-8, and TNF-α. TP inhibited activation of the TLR/MAPK/PKC-MLCK signaling for down-regulated TLR-2, TLR4, p-JNK, p-p38, p-PKC-α, and MLCK in cells triggered by APP. Collectively, our data suggest that TP represents a promising therapeutic agent in the treatment of APP infection. [ABSTRACT FROM AUTHOR]

Published
2023
Full Text
View/download PDF

147. Yak Gut Microbiota: A Systematic Review and Meta-Analysis

Author

Su, Yuxin, primary, Su, Junhong, additional, Li, Fanglin, additional, Tian, Xiaojing, additional, Liu, Zewen, additional, Ding, Gongtao, additional, Bai, Jialin, additional, Li, Zhuo, additional, Ma, Zhongren, additional, and Peppelenbosch, Maikel P., additional

Published
2022
Full Text
View/download PDF

Catalog

Books, media, physical & digital resources
See catalog results