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Zhang S, Hettige JJ, Li Y, Jian T, Yang W, Yao YC, Zheng R, Lin Z, Tao J, De Yoreo JJ, Baer M, Noy A, Chen CL. Co-Assembly of Carbon Nanotube Porins into Biomimetic Peptoid Membranes. Small 2023; 19:e2206810. [PMID: 36811318 DOI: 10.1002/smll.202206810] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/04/2022] [Revised: 01/06/2023] [Indexed: 05/25/2023]
Abstract
Robust and cost-effective membrane-based separations are essential to solving many global crises, such as the lack of clean water. Even though the current polymer-based membranes are widely used for separations, their performance and precision can be enhanced by using a biomimetic membrane architecture that consists of highly permeable and selective channels embedded in a universal membrane matrix. Researchers have shown that artificial water and ion channels, such as carbon nanotube porins (CNTPs), embedded in lipid membranes can deliver strong separation performance. However, their applications are limited by the relative fragility and low stability of the lipid matrix. In this work, we demonstrate that CNTPs can co-assemble into two dimension (2D) peptoid membrane nanosheets, opening up a way to produce highly programmable synthetic membranes with superior crystallinity and robustness. A combination of molecular dynamics (MD) simulations, Raman spectroscopy, X-ray diffraction (XRD), and atomic force microscopy (AFM) measurements to verify the co-assembly of CNTP and peptoids are used and show that it does not disrupt peptoid monomer packing within the membrane. These results provide a new option for designing affordable artificial membranes and highly robust nanoporous solids.
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Affiliation(s)
- Shuai Zhang
- Physical Sciences Division, Pacific Northwest National Laboratory, Richland, WA, 99354, USA
- Materials Science and Engineering, University of Washington, Seattle, WA, 98105, USA
| | - Jeevapani J Hettige
- Physical Sciences Division, Pacific Northwest National Laboratory, Richland, WA, 99354, USA
| | - Yuhao Li
- Physical and Life Sciences Directorate, Lawrence Livermore National Laboratory, Livermore, CA, 94550, USA
| | - Tengyue Jian
- Physical Sciences Division, Pacific Northwest National Laboratory, Richland, WA, 99354, USA
| | - Wenchao Yang
- Physical Sciences Division, Pacific Northwest National Laboratory, Richland, WA, 99354, USA
| | - Yun-Chiao Yao
- Physical and Life Sciences Directorate, Lawrence Livermore National Laboratory, Livermore, CA, 94550, USA
- School of Natural Sciences, University of California Merced, Merced, CA, 95343, USA
| | - Renyu Zheng
- Department of Chemical Engineering, University of Washington, Seattle, WA, 98105, USA
| | - Zhixing Lin
- Materials Science and Engineering, University of Washington, Seattle, WA, 98105, USA
| | - Jinhui Tao
- Physical Sciences Division, Pacific Northwest National Laboratory, Richland, WA, 99354, USA
| | - James J De Yoreo
- Physical Sciences Division, Pacific Northwest National Laboratory, Richland, WA, 99354, USA
- Materials Science and Engineering, University of Washington, Seattle, WA, 98105, USA
| | - Marcel Baer
- Physical Sciences Division, Pacific Northwest National Laboratory, Richland, WA, 99354, USA
| | - Aleksandr Noy
- Physical and Life Sciences Directorate, Lawrence Livermore National Laboratory, Livermore, CA, 94550, USA
- School of Natural Sciences, University of California Merced, Merced, CA, 95343, USA
| | - Chun-Long Chen
- Physical Sciences Division, Pacific Northwest National Laboratory, Richland, WA, 99354, USA
- Department of Chemical Engineering, University of Washington, Seattle, WA, 98105, USA
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2
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Aluru NR, Aydin F, Bazant MZ, Blankschtein D, Brozena AH, de Souza JP, Elimelech M, Faucher S, Fourkas JT, Koman VB, Kuehne M, Kulik HJ, Li HK, Li Y, Li Z, Majumdar A, Martis J, Misra RP, Noy A, Pham TA, Qu H, Rayabharam A, Reed MA, Ritt CL, Schwegler E, Siwy Z, Strano MS, Wang Y, Yao YC, Zhan C, Zhang Z. Fluids and Electrolytes under Confinement in Single-Digit Nanopores. Chem Rev 2023; 123:2737-2831. [PMID: 36898130 PMCID: PMC10037271 DOI: 10.1021/acs.chemrev.2c00155] [Citation(s) in RCA: 9] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/12/2023]
Abstract
Confined fluids and electrolyte solutions in nanopores exhibit rich and surprising physics and chemistry that impact the mass transport and energy efficiency in many important natural systems and industrial applications. Existing theories often fail to predict the exotic effects observed in the narrowest of such pores, called single-digit nanopores (SDNs), which have diameters or conduit widths of less than 10 nm, and have only recently become accessible for experimental measurements. What SDNs reveal has been surprising, including a rapidly increasing number of examples such as extraordinarily fast water transport, distorted fluid-phase boundaries, strong ion-correlation and quantum effects, and dielectric anomalies that are not observed in larger pores. Exploiting these effects presents myriad opportunities in both basic and applied research that stand to impact a host of new technologies at the water-energy nexus, from new membranes for precise separations and water purification to new gas permeable materials for water electrolyzers and energy-storage devices. SDNs also present unique opportunities to achieve ultrasensitive and selective chemical sensing at the single-ion and single-molecule limit. In this review article, we summarize the progress on nanofluidics of SDNs, with a focus on the confinement effects that arise in these extremely narrow nanopores. The recent development of precision model systems, transformative experimental tools, and multiscale theories that have played enabling roles in advancing this frontier are reviewed. We also identify new knowledge gaps in our understanding of nanofluidic transport and provide an outlook for the future challenges and opportunities at this rapidly advancing frontier.
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Affiliation(s)
- Narayana R Aluru
- Oden Institute for Computational Engineering and Sciences, Walker Department of Mechanical Engineering, The University of Texas at Austin, Austin, 78712TexasUnited States
| | - Fikret Aydin
- Materials Science Division, Physical and Life Science Directorate, Lawrence Livermore National Laboratory, Livermore, California94550, United States
| | - Martin Z Bazant
- Department of Chemical Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts02139, United States
- Department of Mathematics, Massachusetts Institute of Technology, Cambridge, Massachusetts02139, United States
| | - Daniel Blankschtein
- Department of Chemical Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts02139, United States
| | - Alexandra H Brozena
- Department of Chemistry and Biochemistry, University of Maryland, College Park, Maryland20742, United States
| | - J Pedro de Souza
- Department of Chemical Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts02139, United States
| | - Menachem Elimelech
- Department of Chemical and Environmental Engineering, Yale University, New Haven, Connecticut06520-8286, United States
| | - Samuel Faucher
- Department of Chemical Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts02139, United States
| | - John T Fourkas
- Department of Chemistry and Biochemistry, University of Maryland, College Park, Maryland20742, United States
- Institute for Physical Science and Technology, University of Maryland, College Park, Maryland20742, United States
- Maryland NanoCenter, University of Maryland, College Park, Maryland20742, United States
| | - Volodymyr B Koman
- Department of Chemical Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts02139, United States
| | - Matthias Kuehne
- Department of Chemical Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts02139, United States
| | - Heather J Kulik
- Department of Chemical Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts02139, United States
| | - Hao-Kun Li
- Department of Mechanical Engineering, Stanford University, Stanford, California94305, United States
| | - Yuhao Li
- Materials Science Division, Physical and Life Science Directorate, Lawrence Livermore National Laboratory, Livermore, California94550, United States
| | - Zhongwu Li
- Materials Science Division, Physical and Life Science Directorate, Lawrence Livermore National Laboratory, Livermore, California94550, United States
| | - Arun Majumdar
- Department of Mechanical Engineering, Stanford University, Stanford, California94305, United States
| | - Joel Martis
- Department of Mechanical Engineering, Stanford University, Stanford, California94305, United States
| | - Rahul Prasanna Misra
- Department of Chemical Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts02139, United States
| | - Aleksandr Noy
- Materials Science Division, Physical and Life Science Directorate, Lawrence Livermore National Laboratory, Livermore, California94550, United States
- School of Natural Sciences, University of California Merced, Merced, California95344, United States
| | - Tuan Anh Pham
- Materials Science Division, Physical and Life Science Directorate, Lawrence Livermore National Laboratory, Livermore, California94550, United States
| | - Haoran Qu
- Department of Chemistry and Biochemistry, University of Maryland, College Park, Maryland20742, United States
| | - Archith Rayabharam
- Oden Institute for Computational Engineering and Sciences, Walker Department of Mechanical Engineering, The University of Texas at Austin, Austin, 78712TexasUnited States
| | - Mark A Reed
- Department of Electrical Engineering, Yale University, 15 Prospect Street, New Haven, Connecticut06520, United States
| | - Cody L Ritt
- Department of Chemical and Environmental Engineering, Yale University, New Haven, Connecticut06520-8286, United States
| | - Eric Schwegler
- Materials Science Division, Physical and Life Science Directorate, Lawrence Livermore National Laboratory, Livermore, California94550, United States
| | - Zuzanna Siwy
- Department of Physics and Astronomy, Department of Chemistry, Department of Biomedical Engineering, University of California, Irvine, Irvine92697, United States
| | - Michael S Strano
- Department of Chemical Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts02139, United States
| | - YuHuang Wang
- Department of Chemistry and Biochemistry, University of Maryland, College Park, Maryland20742, United States
- Maryland NanoCenter, University of Maryland, College Park, Maryland20742, United States
| | - Yun-Chiao Yao
- Materials Science Division, Physical and Life Science Directorate, Lawrence Livermore National Laboratory, Livermore, California94550, United States
- School of Natural Sciences, University of California Merced, Merced, California95344, United States
| | - Cheng Zhan
- Materials Science Division, Physical and Life Science Directorate, Lawrence Livermore National Laboratory, Livermore, California94550, United States
| | - Ze Zhang
- Department of Mechanical Engineering, Stanford University, Stanford, California94305, United States
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3
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Li Z, Misra RP, Li Y, Yao YC, Zhao S, Zhang Y, Chen Y, Blankschtein D, Noy A. Breakdown of the Nernst-Einstein relation in carbon nanotube porins. Nat Nanotechnol 2023; 18:177-183. [PMID: 36585518 DOI: 10.1038/s41565-022-01276-0] [Citation(s) in RCA: 11] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/27/2021] [Accepted: 10/17/2022] [Indexed: 06/17/2023]
Abstract
For over 100 years, the Nernst-Einstein relation has linked a charged particle's electrophoretic mobility and diffusion coefficient. Here we report experimental measurements of diffusion and electromigration of K+ ions in narrow 0.8-nm-diameter single-walled carbon nanotube porins (CNTPs) and demonstrate that the Nernst-Einstein relation in these channels breaks down by more than three orders of magnitude. Molecular dynamics simulations using polarizable force fields show that K+ ion diffusion in CNTPs in the presence of a single-file water chain is three orders of magnitude slower than bulk diffusion. Intriguingly, the simulations also reveal a disintegration of the water chain upon application of electric fields, resulting in the formation of distinct K+-water clusters, which then traverse the CNTP at high velocity. Finally, we show that although individual ion-water clusters still obey the Nernst-Einstein relation, the overall relation breaks down because of two distinct mechanisms for ion diffusion and electromigration.
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Affiliation(s)
- Zhongwu Li
- Materials Science Division, Physical and Life Sciences Directorate, Lawrence Livermore National Laboratory, Livermore, CA, USA
- Jiangsu Key Laboratory for Design and Manufacture of Micro-Nano Biomedical Instruments, School of Mechanical Engineering, Southeast University, Nanjing, China
- School of Mechatronic Engineering, China University of Mining and Technology, Xuzhou, China
| | - Rahul Prasanna Misra
- Department of Chemical Engineering, Massachusetts Institute of Technology, Cambridge, MA, USA
| | - Yuhao Li
- Materials Science Division, Physical and Life Sciences Directorate, Lawrence Livermore National Laboratory, Livermore, CA, USA
| | - Yun-Chiao Yao
- Materials Science Division, Physical and Life Sciences Directorate, Lawrence Livermore National Laboratory, Livermore, CA, USA
- School of Natural Sciences, University of California Merced, Merced, CA, USA
| | - Sidi Zhao
- Materials Science Division, Physical and Life Sciences Directorate, Lawrence Livermore National Laboratory, Livermore, CA, USA
- School of Engineering, University of California Merced, Merced, CA, USA
| | - Yuliang Zhang
- Materials Science Division, Physical and Life Sciences Directorate, Lawrence Livermore National Laboratory, Livermore, CA, USA
| | - Yunfei Chen
- Jiangsu Key Laboratory for Design and Manufacture of Micro-Nano Biomedical Instruments, School of Mechanical Engineering, Southeast University, Nanjing, China
| | - Daniel Blankschtein
- Department of Chemical Engineering, Massachusetts Institute of Technology, Cambridge, MA, USA.
| | - Aleksandr Noy
- Materials Science Division, Physical and Life Sciences Directorate, Lawrence Livermore National Laboratory, Livermore, CA, USA.
- School of Natural Sciences, University of California Merced, Merced, CA, USA.
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4
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Yao YC, Li Z, Gillen AJ, Yosinski S, Reed MA, Noy A. Electrostatic gating of ion transport in carbon nanotube porins: A modeling study. J Chem Phys 2021; 154:204704. [PMID: 34241182 DOI: 10.1063/5.0049550] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Carbon nanotube porins (CNTPs) are biomimetic membrane channels that demonstrate excellent biocompatibility and unique water and ion transport properties. Gating transport in CNTPs with external voltage could increase control over ion flow and selectivity. Herein, we used continuum modeling to probe the parameters that enable and further affect CNTP gating efficiency, including the size and composition of the supporting lipid membrane, slip flow in the carbon nanotube, and the intrinsic electronic properties of the nanotube. Our results show that the optimal gated CNTP device consists of a semiconducting CNTP inserted into a small membrane patch containing an internally conductive layer. Moreover, we demonstrate that the ionic transport modulated by gate voltages is controlled by the charge distribution along the CNTP under the external gate electric potential. The theoretical understanding developed in this study offers valuable guidance for the design of gated CNTP devices for nanofluidic studies, novel biomimetic membranes, and cellular interfaces in the future.
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Affiliation(s)
- Yun-Chiao Yao
- Physical and Life Sciences Directorate, Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - Zhongwu Li
- Physical and Life Sciences Directorate, Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - Alice J Gillen
- Physical and Life Sciences Directorate, Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - Shari Yosinski
- Department of Electrical Engineering, Yale University, New Haven, Connecticut 06520, USA
| | - Mark A Reed
- Department of Electrical Engineering, Yale University, New Haven, Connecticut 06520, USA
| | - Aleksandr Noy
- Physical and Life Sciences Directorate, Lawrence Livermore National Laboratory, Livermore, California 94550, USA
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5
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Hicks JM, Yao YC, Barber S, Neate N, Watts JA, Noy A, Rawson FJ. Electric Field Induced Biomimetic Transmembrane Electron Transport Using Carbon Nanotube Porins. Small 2021; 17:e2102517. [PMID: 34269516 DOI: 10.1002/smll.202102517] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/28/2021] [Revised: 05/27/2021] [Indexed: 06/13/2023]
Abstract
Cells modulate their homeostasis through the control of redox reactions via transmembrane electron transport systems. These are largely mediated via oxidoreductase enzymes. Their use in biology has been linked to a host of systems including reprogramming for energy requirements in cancer. Consequently, the ability to modulate membrane redox systems may give rise to opportunities to modulate underlying biology. The current work aims to develop a wireless bipolar electrochemical approach to form on-demand electron transfer across biological membranes. To achieve this goal, it is shown that by using membrane inserted carbon nanotube porins (CNTPs) that can act as bipolar nanoelectrodes, one can control electron flow with externally applied electric fields across membranes. Before this work, bipolar electrochemistry has been thought to require high applied voltages not compatible with biological systems. It is shown that bipolar electrochemical reaction via gold reduction at the nanotubes can be modulated at low cell-friendly voltages, providing an opportunity to use bipolar electrodes to control electron flux across membranes. The authors provide new mechanistic insight into this newly describe phenomena at the nanoscale. The results presented give rise to a new method using CNTPs to modulate cell behavior via wireless control of membrane electron transfer.
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Affiliation(s)
- Jacqueline M Hicks
- Biodiscovery Institute, School of Pharmacy, Division of Regenerative Medicine and Cellular Therapies, University of Nottingham, Nottingham, NG7 2RD, UK
| | - Yun-Chiao Yao
- School of Natural Sciences, University of California Merced, Merced, 95343, USA
- Materials Science Division, Lawrence Livermore National Laboratory, Livermore, 94550, USA
| | - Sydney Barber
- Materials Science Division, Lawrence Livermore National Laboratory, Livermore, 94550, USA
- United States Naval Academy, Annapolis, 21402, USA
| | - Nigel Neate
- Nanoscale and Microscale Research Centre, University of Nottingham, Nottingham, NG7 2RD, UK
| | - Julie A Watts
- Biodiscovery Institute, School of Pharmacy, Division of Regenerative Medicine and Cellular Therapies, University of Nottingham, Nottingham, NG7 2RD, UK
| | - Aleksandr Noy
- School of Natural Sciences, University of California Merced, Merced, 95343, USA
- Materials Science Division, Lawrence Livermore National Laboratory, Livermore, 94550, USA
| | - Frankie J Rawson
- Biodiscovery Institute, School of Pharmacy, Division of Regenerative Medicine and Cellular Therapies, University of Nottingham, Nottingham, NG7 2RD, UK
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Yao YC, Song XT, Zhai YF, Liu S, Lu J, Xu X, Qi MY, Zhang JN, Huang H, Liu YF, Liu GS, Yuan H. Transcriptome analysis of sheep follicular development during prerecruitment, dominant, and mature stages after FSH superstimulation. Domest Anim Endocrinol 2021; 74:106563. [PMID: 33129139 DOI: 10.1016/j.domaniend.2020.106563] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/03/2020] [Revised: 07/08/2020] [Accepted: 09/08/2020] [Indexed: 12/29/2022]
Abstract
Sheep is usually a monovular animal; superovulation technology is used to increase the number of offspring per individual and shorten generation intervals. To date, mature FSH superstimulatory treatments have been successfully used in sheep breeding, but much remains unknown about genes, pathways, and biological functions involved in follicular development. Therefore, in this study, we performed transcriptome profiling of small follicles (SFs; 2-2.5 mm), medium follicles (MFs; 3.5-4.5 mm), and large follicles (LFs; > 6 mm) in Mongolian ewes after FSH superstimulation. Furthermore, we identified differentially expressed genes and performed Kyoto Encyclopedia of Genes and Genomes pathway and Gene Ontology enrichment analyses in 3 separate pairwise comparisons. We found that ovarian steroidogenesis was significantly enriched in the SFs versus MFs analysis; the associated genes, cytochrome P450 family 19 (CYP19) and Hydroxy-delta-5-steroid dehydrogenase 3 beta- and steroid delta-isomerase 1 (HSD3B1), were significantly upregulated. Moreover, proline metabolism, glutathione metabolism, and PPAR signaling pathways were significantly enriched in the LFs versus SFs analysis; the associated genes, glutamate-cysteine ligase modifier subunit (GCLM) and cystathionine gamma-lyase (CTH), were significantly upregulated, whereas peroxisome proliferator-activated receptor gamma (PPARγ) was significantly downregulated. In summary, our study provides basic data and possible biological direction to further explore the molecular mechanism of sheep follicular development after FSH superstimulation.
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Affiliation(s)
- Y C Yao
- College of Animal Science and Technology, Northeast Agricultural University, Harbin 150030, Heilongjiang, China; Key Laboratory of Animal Genetics, Breeding and Reproduction, Education Department of Heilongjiang province, Harbin 150030, Heilongjiang, China
| | - X T Song
- College of Animal Science and Technology, Northeast Agricultural University, Harbin 150030, Heilongjiang, China; Key Laboratory of Animal Genetics, Breeding and Reproduction, Education Department of Heilongjiang province, Harbin 150030, Heilongjiang, China
| | - Y F Zhai
- College of Animal Science and Technology, Northeast Agricultural University, Harbin 150030, Heilongjiang, China; Key Laboratory of Animal Genetics, Breeding and Reproduction, Education Department of Heilongjiang province, Harbin 150030, Heilongjiang, China
| | - S Liu
- College of Animal Science and Technology, Northeast Agricultural University, Harbin 150030, Heilongjiang, China; Key Laboratory of Animal Genetics, Breeding and Reproduction, Education Department of Heilongjiang province, Harbin 150030, Heilongjiang, China
| | - J Lu
- College of Animal Science and Technology, Northeast Agricultural University, Harbin 150030, Heilongjiang, China; Key Laboratory of Animal Genetics, Breeding and Reproduction, Education Department of Heilongjiang province, Harbin 150030, Heilongjiang, China
| | - X Xu
- College of Animal Science and Technology, Northeast Agricultural University, Harbin 150030, Heilongjiang, China; Key Laboratory of Animal Genetics, Breeding and Reproduction, Education Department of Heilongjiang province, Harbin 150030, Heilongjiang, China
| | - M Y Qi
- Institute of Animal Husbandry, Heilongjiang Academy of Agricultural Sciences, Harbin 150086, Heilongjiang, China
| | - J N Zhang
- College of Animal Science and Technology, Northeast Agricultural University, Harbin 150030, Heilongjiang, China; Key Laboratory of Animal Genetics, Breeding and Reproduction, Education Department of Heilongjiang province, Harbin 150030, Heilongjiang, China
| | - H Huang
- College of Animal Science and Technology, Northeast Agricultural University, Harbin 150030, Heilongjiang, China; Key Laboratory of Animal Genetics, Breeding and Reproduction, Education Department of Heilongjiang province, Harbin 150030, Heilongjiang, China
| | - Y F Liu
- Institute of Animal Husbandry, Heilongjiang Academy of Agricultural Sciences, Harbin 150086, Heilongjiang, China
| | - G S Liu
- College of Animal Science and Technology, China Agricultural University, Beijing 100193, China
| | - H Yuan
- College of Animal Science and Technology, Northeast Agricultural University, Harbin 150030, Heilongjiang, China; Key Laboratory of Animal Genetics, Breeding and Reproduction, Education Department of Heilongjiang province, Harbin 150030, Heilongjiang, China.
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Huang R, Shi HT, Yao YC. [Perceived organizational support and emotional stability modify the effect of depression tendency on burnout in doctors]. Zhonghua Lao Dong Wei Sheng Zhi Ye Bing Za Zhi 2020; 38:467-469. [PMID: 32629584 DOI: 10.3760/cma.j.cn121094-20190808-00333] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
Objective: To explore and analyze the relationship between burnout, depression, perceived organizational support and emotional stability, as well as their interaction on burnout, so as to provide reference for improving the situation of burnout on doctors. Methods: By cluster random sampling, a cross-sectional survey of doctors in a municipal hospitals of Zhengzhou in June to August, 2015, Henan Province was conducted. The questionnaires of Maslach Burnout Inventory-General Survey (MBI-GS) , Perceived organizational support, Eysenck Personality Questionnair-Revission Short Scale of China (EPQ-RSC) and Center for Epidemiological Studies Depression Scale (CES-D) were used for questionnaire survey and analysis. Multiple regression analysis was used to explore the interaction of organizational support and emotional stability on depressive tendency and occupational burnout. Results: Among the 389 doctors, 147 were males and 242 were females. Age M (P(25), P(75)) was 33.0 (29.0, 40.0) years, and length of work M (P(25), P(75)) was 7.0 (4.0, 16.0) years. Burnout was positively correlated with depression tendency and emotional stability (r=0.571, 0.453, P<0.01) , while burnout was negatively correlated with perceived organizational support (r=-0.260, P<0.01) . The interaction among depression tendency, perceived organizational support and emotional stability was statistically significant (β=-0.002, P<0.05) , the independent effect on burnout is 1.0% (ΔR(2)=0.010) , the positive effect of emotional stability was the largest (β=0.550) , followed by the positive effect of depression tendency (β=0.494) . When the tendency of depression increased, the burnout of doctors with high perceived organizational support and emotional stability was higher than those with high perceived organizational support and emotional instability and those with low perceived organizational support (P<0.01) . Conclusion: Emotional stability is the main factor affecting the effect of depression tendency on doctors' burnout. Doctors with stable emotion and high perceived organizational support showed obvious changes in burnout when depression tendency increased, and showed stronger burnout.
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Affiliation(s)
- R Huang
- Bijie Medical College, Bijie551700, China
| | - H T Shi
- Henan Agricultural University, Zhengzhou 450002, China
| | - Y C Yao
- Zhengzhou Normal University, Zhengzhou 450044, China
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8
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Li Y, Li Z, Aydin F, Quan J, Chen X, Yao YC, Zhan C, Chen Y, Pham TA, Noy A. Water-ion permselectivity of narrow-diameter carbon nanotubes. Sci Adv 2020; 6:6/38/eaba9966. [PMID: 32938679 PMCID: PMC7494338 DOI: 10.1126/sciadv.aba9966] [Citation(s) in RCA: 39] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/25/2020] [Accepted: 07/29/2020] [Indexed: 05/08/2023]
Abstract
Carbon nanotube (CNT) pores, which mimic the structure of the aquaporin channels, support extremely high water transport rates that make them strong candidates for building artificial water channels and high-performance membranes. Here, we measure water and ion permeation through 0.8-nm-diameter CNT porins (CNTPs)-short CNT segments embedded in lipid membranes-under optimized experimental conditions. Measured activation energy of water transport through the CNTPs agrees with the barrier values typical for single-file water transport. Well-tempered metadynamics simulations of water transport in CNTPs also report similar activation energy values and provide molecular-scale details of the mechanism for water entry into these channels. CNTPs strongly reject chloride ions and show water-salt permselectivity values comparable to those of commercial desalination membranes.
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Affiliation(s)
- Yuhao Li
- Materials Science Division, Physical and Life Sciences Directorate, Lawrence Livermore National Laboratory, Livermore, CA 94550, USA
| | - Zhongwu Li
- Materials Science Division, Physical and Life Sciences Directorate, Lawrence Livermore National Laboratory, Livermore, CA 94550, USA
- Jiangsu Key Laboratory for Design and Manufacture of Micro-Nano Biomedical Instruments, School of Mechanical Engineering, Southeast University, Nanjing 211189, China
| | - Fikret Aydin
- Quantum Simulations Group, Materials Science Division, Physical and Life Sciences Directorate, Lawrence Livermore National Laboratory, Livermore, CA 94550, USA
| | - Jana Quan
- Materials Science Division, Physical and Life Sciences Directorate, Lawrence Livermore National Laboratory, Livermore, CA 94550, USA
| | - Xi Chen
- Materials Science Division, Physical and Life Sciences Directorate, Lawrence Livermore National Laboratory, Livermore, CA 94550, USA
- School of Natural Sciences, University of California Merced, Merced, CA 94343, USA
| | - Yun-Chiao Yao
- Materials Science Division, Physical and Life Sciences Directorate, Lawrence Livermore National Laboratory, Livermore, CA 94550, USA
- School of Natural Sciences, University of California Merced, Merced, CA 94343, USA
| | - Cheng Zhan
- Quantum Simulations Group, Materials Science Division, Physical and Life Sciences Directorate, Lawrence Livermore National Laboratory, Livermore, CA 94550, USA
| | - Yunfei Chen
- Jiangsu Key Laboratory for Design and Manufacture of Micro-Nano Biomedical Instruments, School of Mechanical Engineering, Southeast University, Nanjing 211189, China
| | - Tuan Anh Pham
- Quantum Simulations Group, Materials Science Division, Physical and Life Sciences Directorate, Lawrence Livermore National Laboratory, Livermore, CA 94550, USA.
| | - Aleksandr Noy
- Materials Science Division, Physical and Life Sciences Directorate, Lawrence Livermore National Laboratory, Livermore, CA 94550, USA.
- School of Natural Sciences, University of California Merced, Merced, CA 94343, USA
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9
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Li Z, Li Y, Yao YC, Aydin F, Zhan C, Chen Y, Elimelech M, Pham TA, Noy A. Strong Differential Monovalent Anion Selectivity in Narrow Diameter Carbon Nanotube Porins. ACS Nano 2020; 14:6269-6275. [PMID: 32347708 DOI: 10.1021/acsnano.0c02423] [Citation(s) in RCA: 23] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Inner pores of carbon nanotubes combine extremely fast water transport and ion selectivity that could potentially be useful for high-performance water desalination and separation applications. We used dye-quenching halide assays and stopped-flow spectrometry to determine intrinsic permeability of three small monovalent halide anions (chloride, bromide, iodide) and one pseudohalide anion (thiocyanate) through narrow 0.8 nm diameter carbon nanotube porins (CNTPs). These measurements revealed unexpectedly strong differential ion selectivity with permeabilities of different ions varying by up to 2 orders of magnitude. Removal of the negative charge from the nanotube entrance increased anion permeability by only a relatively small factor, indicating that electrostatic repulsion was not a major determinant of CNTP selectivity. First principle molecular dynamics simulations revealed that the origin of this strong differential ion selectivity is partial dehydration of anions upon entry into the narrow CNTP channels.
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Affiliation(s)
- Zhongwu Li
- Materials Science Division, Lawrence Livermore National Laboratory, 7000 East Avenue, Livermore, California 94550, United States
- Jiangsu Key Laboratory for Design and Manufacture of Micro-Nano Biomedical Instruments, School of Mechanical Engineering, Southeast University, Nanjing 211189, China
| | - Yuhao Li
- Materials Science Division, Lawrence Livermore National Laboratory, 7000 East Avenue, Livermore, California 94550, United States
| | - Yun-Chiao Yao
- Materials Science Division, Lawrence Livermore National Laboratory, 7000 East Avenue, Livermore, California 94550, United States
- School of Natural Sciences, University of California Merced, Merced, California 94343, United States
| | - Fikret Aydin
- Quantum Simulations Group, Materials Science Division, Lawrence Livermore National Laboratory, 7000 East Avenue, Livermore, California 94550, United States
| | - Cheng Zhan
- Quantum Simulations Group, Materials Science Division, Lawrence Livermore National Laboratory, 7000 East Avenue, Livermore, California 94550, United States
| | - Yunfei Chen
- Jiangsu Key Laboratory for Design and Manufacture of Micro-Nano Biomedical Instruments, School of Mechanical Engineering, Southeast University, Nanjing 211189, China
| | - Menachem Elimelech
- Department of Chemical and Environmental Engineering, Yale University, New Haven, Connecticut 06520, United States
| | - Tuan Anh Pham
- Quantum Simulations Group, Materials Science Division, Lawrence Livermore National Laboratory, 7000 East Avenue, Livermore, California 94550, United States
| | - Aleksandr Noy
- Materials Science Division, Lawrence Livermore National Laboratory, 7000 East Avenue, Livermore, California 94550, United States
- School of Natural Sciences, University of California Merced, Merced, California 94343, United States
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10
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Hammons JA, Ingólfsson HI, Lee JRI, Carpenter TS, Sanborn J, Tunuguntla R, Yao YC, Weiss TM, Noy A, Van Buuren T. Decoupling copolymer, lipid and carbon nanotube interactions in hybrid, biomimetic vesicles. Nanoscale 2020; 12:6545-6555. [PMID: 32159198 DOI: 10.1039/c9nr09973e] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Bilayer vesicles that mimic a real biological cell can be tailored to carry out a specific function by manipulating the molecular composition of the amphiphiles. These bio-inspired and bio-mimetic structures are increasingly being employed for a number of applications from drug delivery to water purification and beyond. Complex hybrid bilayers are the key building blocks for fully synthetic vesicles that can mimic biological cell membranes, which often contain a wide variety of molecular species. While the assembly and morpholgy of pure phospholid bilayer vesicles is well understood, the functionality and structure dramaticlly changes when copolymer and/or carbon nanotube porins (CNTP) are added. The aim of this study is to understand how the collective molecular interactions within hybrid vesicles affect their nanoscale structure and properties. In situ small and wide angle X-ray scattering (SAXS/WAXS) and molecular dynamics simulations (MD) are used to investigate the morphological effect of molecular interactions between polybutadiene polyethylene oxide, lipids and carbon nanotubes (CNT) within the hybrid vesicle bilayer. Within the lipid/copolymer system, the hybrid bilayer morphology transitions from phase separated lipid and compressed copolymer at low copolymer loadings to a mixed bilayer where opposing lipids are mostly separated from the inner region. This transition begins between 60 wt% and 70 wt%, with full homogenization observed by 80 wt% copolymer. The incorporation of CNT into the hybrid vesicles increases the bilayer thickness and enhances the bilayer symmetry. Analysis of the WAXS and MD indicate that the CNT-dioleoyl interactions are much stronger than the CNT-polybutadiene.
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Affiliation(s)
- Joshua A Hammons
- Materials Science Division, Physical and Life Science Directorate, Lawrence Livermore National Laboratory, USA.
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11
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Yao YC, Taqieddin A, Alibakhshi MA, Wanunu M, Aluru NR, Noy A. Strong Electroosmotic Coupling Dominates Ion Conductance of 1.5 nm Diameter Carbon Nanotube Porins. ACS Nano 2019; 13:12851-12859. [PMID: 31682401 DOI: 10.1021/acsnano.9b05118] [Citation(s) in RCA: 30] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/06/2023]
Abstract
Extreme confinement in nanometer-sized channels can alter fluid and ion transport in significant ways, leading to significant water flow enhancement and unusual ion correlation effects. These effects are especially pronounced in carbon nanotube porins (CNTPs) that combine strong confinement in the inner lumen of carbon nanotubes with the high slip flow enhancement due to smooth hydrophobic pore walls. We have studied ion transport and ion selectivity in 1.5 nm diameter CNTPs embedded in lipid membranes using a single nanopore measurement setup. Our data show that CNTPs are weakly cation selective at pH 7.5 and become nonselective at pH 3.0. Ion conductance of CNTPs exhibits an unusual 2/3 power law scaling with the ion concentration at both neutral and acidic pH values. Coupled Navier-Stokes and Poisson-Nernst-Planck simulations and atomistic molecular dynamics simulations reveal that this scaling originates from strong coupling between water and ion transport in these channels. These effects could result in development of a next generation of biomimetic membranes and carbon nanotube-based electroosmotic pumps.
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Affiliation(s)
- Yun-Chiao Yao
- Physics and Life Sciences Directorate , Lawrence Livermore National Laboratory , Livermore , California 94550 , United States
- School of Natural Sciences , University of California Merced , Merced , California 95344 , United States
| | - Amir Taqieddin
- Department of Mechanical Science and Engineering, Beckman Institute for Advanced Science and Technology , University of Illinois at Urbana-Champaign , Champaign , Illinois 61820 , United States
| | - Mohammad A Alibakhshi
- Department of Physics , Northeastern University , Boston , Massachusetts 02120 , United States
| | - Meni Wanunu
- Department of Physics , Northeastern University , Boston , Massachusetts 02120 , United States
| | - Narayana R Aluru
- Department of Mechanical Science and Engineering, Beckman Institute for Advanced Science and Technology , University of Illinois at Urbana-Champaign , Champaign , Illinois 61820 , United States
| | - Aleksandr Noy
- Physics and Life Sciences Directorate , Lawrence Livermore National Laboratory , Livermore , California 94550 , United States
- School of Natural Sciences , University of California Merced , Merced , California 95344 , United States
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12
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Yao YC, Tan BH, Zhang K. A general experimental system for the development of acoustic logging tools. Rev Sci Instrum 2019; 90:045109. [PMID: 31043055 DOI: 10.1063/1.5082342] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/20/2018] [Accepted: 03/20/2019] [Indexed: 06/09/2023]
Abstract
Laboratory testing is a pre-requisite for the practical application of new methods and techniques, and it is crucial in the research and development of acoustic well-logging tools. Various tools have been developed based on different acoustic logging theories and methods. Thus, these tools are equipped with different acoustic sonde structures. To meet the test requirements of different tools in a laboratory environment, we designed a general experimental system that includes hardware platform, software platform, and model wells according to the common structure of actual logging tools. Similar to the internal electrical structure of downhole tools, the hardware platform consists of several main parts, such as power supply, control and telemetering, acoustic emission, and data acquisition. The functions of this hardware platform include controlling the working sequence of the experiment, exciting the transmitter sonde, and collecting the acoustic signals received by the receiver sonde. The software platform installed in the host computer provides a human-computer interface for the experimental system to complete the data transmission between the host computer and the hardware platform, store measured data, and process the data in real time. The model wells approximate the actual engineering environment and stratum condition for system testing. A series of practical laboratory experiments is conducted in the model wells by using this experimental system. The process proves that the hardware and software of the experimental system can work in coordination, and the experimental system meets the basic testing requirements of conventional acoustic logging tools.
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Affiliation(s)
- Y C Yao
- College of Information and Control Engineering, China University of Petroleum (East China), Qingdao 266580, China
| | - B H Tan
- School of Geosciences, China University of Petroleum (East China), Qingdao 266580, China
| | - K Zhang
- School of Geosciences, China University of Petroleum (East China), Qingdao 266580, China
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13
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Sanborn JR, Chen X, Yao YC, Hammons JA, Tunuguntla RH, Zhang Y, Newcomb CC, Soltis JA, De Yoreo JJ, Van Buuren A, Parikh AN, Noy A. Carbon Nanotube Porins in Amphiphilic Block Copolymers as Fully Synthetic Mimics of Biological Membranes. Adv Mater 2018; 30:e1803355. [PMID: 30368926 DOI: 10.1002/adma.201803355] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/27/2018] [Revised: 08/28/2018] [Indexed: 06/08/2023]
Abstract
Biological membranes provide a fascinating example of a separation system that is multifunctional, tunable, precise, and efficient. Biomimetic membranes, which mimic the architecture of cellular membranes, have the potential to deliver significant improvements in specificity and permeability. Here, a fully synthetic biomimetic membrane is reported that incorporates ultra-efficient 1.5 nm diameter carbon nanotube porin (CNTPs) channels in a block-copolymer matrix. It is demonstrated that CNTPs maintain high proton and water permeability in these membranes. CNTPs can also mimic the behavior of biological gap junctions by forming bridges between vesicular compartments that allow transport of small molecules.
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Affiliation(s)
- Jeremy R Sanborn
- Physical and Life Sciences Directorate, Lawrence Livermore National Laboratory, Livermore, CA, 94550, USA
- University of California Davis, Davis, CA, 95616, USA
| | - Xi Chen
- Physical and Life Sciences Directorate, Lawrence Livermore National Laboratory, Livermore, CA, 94550, USA
- School of Natural Sciences, University of California Merced, Merced, CA, 95343, USA
| | - Yun-Chiao Yao
- Physical and Life Sciences Directorate, Lawrence Livermore National Laboratory, Livermore, CA, 94550, USA
- School of Natural Sciences, University of California Merced, Merced, CA, 95343, USA
| | - Joshua A Hammons
- Physical and Life Sciences Directorate, Lawrence Livermore National Laboratory, Livermore, CA, 94550, USA
| | - Ramya H Tunuguntla
- Physical and Life Sciences Directorate, Lawrence Livermore National Laboratory, Livermore, CA, 94550, USA
| | - Yuliang Zhang
- Physical and Life Sciences Directorate, Lawrence Livermore National Laboratory, Livermore, CA, 94550, USA
| | - Christina C Newcomb
- Physical Sciences Division, Pacific Northwest National Laboratory, Richland, WA, 99354, USA
| | - Jennifer A Soltis
- Physical Sciences Division, Pacific Northwest National Laboratory, Richland, WA, 99354, USA
| | - James J De Yoreo
- Physical Sciences Division, Pacific Northwest National Laboratory, Richland, WA, 99354, USA
- Department of Materials Science and Engineering and Department of Chemistry, University of Washington, Seattle, WA, 98195, USA
| | - Anthony Van Buuren
- Physical and Life Sciences Directorate, Lawrence Livermore National Laboratory, Livermore, CA, 94550, USA
| | - Atul N Parikh
- University of California Davis, Davis, CA, 95616, USA
| | - Aleksandr Noy
- Physical and Life Sciences Directorate, Lawrence Livermore National Laboratory, Livermore, CA, 94550, USA
- School of Natural Sciences, University of California Merced, Merced, CA, 95343, USA
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14
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Yao SQ, Yang NW, Guo FF, Qin TB, Zhu XP, Dong ZG, Li ZC, Jiang BJ, Gao JS, Yao YC, Zhang GF, Liu Y, Lu Y, Li HB, Shuai JF, Bai YP, Jin YL. [Expression of type 1 and type 2 cytokines from serum of coal miners and the evaluation in surveillance of coal workers' pneumoconiosis at earlier stage]. Zhonghua Yu Fang Yi Xue Za Zhi 2018; 52:1158-1163. [PMID: 30419701 DOI: 10.3760/cma.j.issn.0253-9624.2018.11.012] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Objectives: To explore the expression regulation of type 1 and type 2 (Th1 and Th2) cytokines from serum of coal miners and the evaluation in surveillance of coal workers' pneumoconiosis, 630 coal miners were studied. Methods: A total of 90 male patients diagnosed as coal workers' pneumoconiosis (CWP) in a institute for occupational health and 19 male workers newly diagnosed as CWP patients was chosen as CWP group with simple random sampling method from a coal mine group from January 2013 to December in 2015. 180 male coal miners with abnormal but not diagnosed as CWP were selected as CWP suspected group with simple random sampling methods, meanwhile 180 male coal miners with normal chest X-ray photograph was as dust-exposed group by 1∶1 matched as age. And 161 healthy males accepted pre-employed examination were selected as control group, CWP suspected group, dust-exposed group and control group called as non-CWP group. According to screening test and diagnosis test, the basic information and occupational history of all subjects were collected, and cytokines including IL-1β, IL-8, IFN-γ, IL-6 and IL-10 of serum were detected. Receiver operator characteristic (ROC) curve was used to determine the optimal cutoff value of each cytokine. Area under curve (AUC), the validity and reliability were calculated and judged. Results: The average age of control group, dust-exposed group, CWP suspected group and CWP group were (27.4±5.0) , (43.4±10.7) , (48.2±6.2) , (64.7±7.0) years old, respectively. The median level of IL-1β, IL-8, IFN-γ and IL-6 in cases group (1 638.30, 2 099.49, 815.18,140.32 pg/ml) were higher than that of non-cases group (1 445.57, 1 402.26, 736.38, 95.73 pg/ml) (P<0.05) . The level of IL-8 (1 503.99 pg/ml) in CWP suspected group was higher than that of control group (1 295.67 pg/ml) and dust-exposed group (1 376.94 pg/ml) , but the level of IL-10 (654.08 pg/ml) was lower than that of control group (596.64 pg/ml) . The ratio of IFN-γ/IL-6 ranged from 5 to 8, and the ratio in CWP group (5.87) was lower than that of non-CWP group (7.61) . The IL-6 and IL-8 among the subjects of dust-exposed group in terms of the age distribution of among had reached statistical significance. According to ROC, the cutoff value of IL-1β, IL-6, IL-8, IL-10 and INF-γ reached 1 582.65, 116.53, 1 791.54, 581.08 and 792.69 pg/ml, respectively. The AUC was 0.668, 0.895, 0.859, 0.716 and 0.637, respectively. It was found that IL-6 and IL-8 could be used as biomarkers in detecting CWP, the sensitivity and specificity was 82.6% and 84.6%, 78.0% and 84.8%, respectively; Youden's index was 0.674 and 0.628 and the consistency rate was 84.3% and 83.7%, while Kappa value was 0.55 and 0.52. Conclusion: There was Type 1 and type 2 cytokine dysregulation in CWP patients. IL-6 and IL-8 can be used as effective biomarkers to forecast lung injury before X-ray changes.
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Affiliation(s)
- S Q Yao
- School of Public Health, Xinxiang Medical University, Xinxiang 453003, China
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15
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Huang L, Zhang Y, Yao YC, Cui FF, Shi T, Wang YW, Lan YJ. [Effects of Personality and Psychological Acceptance on Medical Workers' Occupational Stress]. Zhonghua Lao Dong Wei Sheng Zhi Ye Bing Za Zhi 2018; 36:519-522. [PMID: 30248767 DOI: 10.3760/cma.j.issn.1001-9391.2018.07.011] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
Objective: To assess psychological acceptance and occupational stress of medical staff, analyze the relationship among personality, psychological acceptance and occupational stress and discuss the direct or indirect effects of personality to occupational stress. Methods: Eysenck Personality Questionnaire (EPQ-RSC) , Acceptance and Action Questionnaire-II (AAQ-Ⅱ) and Revised Occupational Stress Inventory (OSI-R) were administered to 749 medical staff. Results: The level of occupational stress of medical staff was high, the score of PSY was 26.8±7.13 and the score of PHS was 24.3±6.50. Personality and psychological acceptance can predict occupational stress. Psychological acceptance was a protective factor of occupational stress. Medical staff with personality of introversion, neuroticism and psychoticism suffered higher occupational stress. Personality have both direct and indirect effects on occupational stress. Neuroticism have the strongest effect on occupational stress with effect size of 0.496 (psychological stress) and 0.431 (physical strain) . Conclusion: Medical staff have heavier occupational stress. There is a significant correlation between personality and occupational stress. Measures depending on personality should be taken to deal with this situation.
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Affiliation(s)
- L Huang
- No 4 West China Teaching Hospital, West China School of Public Health, Sichuan University, Chengdu 610041, China
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16
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Tunuguntla RH, Zhang Y, Henley RY, Yao YC, Pham TA, Wanunu M, Noy A. Response to Comment on "Enhanced water permeability and tunable ion selectivity in subnanometer carbon nanotube porins". Science 2018; 359:359/6383/eaaq1241. [PMID: 29599214 DOI: 10.1126/science.aaq1241] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/17/2017] [Accepted: 02/28/2018] [Indexed: 12/31/2022]
Abstract
Horner and Pohl argue that high water transport rates reported for carbon nanotube porins (CNTPs) originate from leakage at the nanotube-bilayer interface. Our results and new experimental evidence are consistent with transport through the nanotube pores and rule out a defect-mediated transport mechanism. Mechanistic origins of the high Arrhenius factor that we reported for narrow CNTPs at pH 8 require further investigation.
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Affiliation(s)
- Ramya H Tunuguntla
- Physical and Life Sciences Directorate, Lawrence Livermore National Laboratory, Livermore, CA 94550, USA
| | - Yuliang Zhang
- Physical and Life Sciences Directorate, Lawrence Livermore National Laboratory, Livermore, CA 94550, USA
| | - Robert Y Henley
- Physical and Life Sciences Directorate, Lawrence Livermore National Laboratory, Livermore, CA 94550, USA.,Physics Department, Northeastern University, Boston, MA 02115, USA
| | - Yun-Chiao Yao
- Physical and Life Sciences Directorate, Lawrence Livermore National Laboratory, Livermore, CA 94550, USA.,School of Natural Sciences, University of California, Merced, CA 94343, USA
| | - T Anh Pham
- Physical and Life Sciences Directorate, Lawrence Livermore National Laboratory, Livermore, CA 94550, USA
| | - Meni Wanunu
- Physics Department, Northeastern University, Boston, MA 02115, USA
| | - Aleksandr Noy
- Physical and Life Sciences Directorate, Lawrence Livermore National Laboratory, Livermore, CA 94550, USA. .,School of Natural Sciences, University of California, Merced, CA 94343, USA
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17
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Yao YC, Henley R, Tunuguntla R, Wanunu M, Noy A. Ionic Transport through 1.5 NM Diameter Carbon Nanotube Porins. Biophys J 2018. [DOI: 10.1016/j.bpj.2017.11.1018] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022] Open
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18
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Tunuguntla RH, Henley RY, Yao YC, Pham TA, Wanunu M, Noy A. Enhanced water permeability and tunable ion selectivity in subnanometer carbon nanotube porins. Science 2017; 357:792-796. [DOI: 10.1126/science.aan2438] [Citation(s) in RCA: 409] [Impact Index Per Article: 58.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2017] [Accepted: 07/11/2017] [Indexed: 12/26/2022]
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19
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Yao YC, Henley R, Tunuguntla R, Wanunu M, Noy A. Single-Channel Measurements of Conductance through Sub-Nanometer Carbon Nanotube Porins. Biophys J 2017. [DOI: 10.1016/j.bpj.2016.11.854] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022] Open
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20
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Li JH, Chiu WC, Yao YC, Cheng RP. Effect of arginine methylation on the RNA recognition and cellular uptake of Tat-derived peptides. Bioorg Med Chem 2015; 23:2281-6. [DOI: 10.1016/j.bmc.2015.01.051] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2014] [Revised: 01/22/2015] [Accepted: 01/28/2015] [Indexed: 12/16/2022]
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21
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Kuo LH, Li JH, Kuo HT, Hung CY, Tsai HY, Chiu WC, Wu CH, Wang WR, Yang PA, Yao YC, Wong TW, Huang SJ, Huang SL, Cheng RP. Effect of charged amino acid side chain length at non-hydrogen bonded strand positions on β-hairpin stability. Biochemistry 2013; 52:7785-97. [PMID: 24156236 DOI: 10.1021/bi400911p] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
β-Sheets have been implicated in various neurological disorders, and ∼20% of protein residues adopt a sheet conformation. Therefore, studies on the structural origin of sheet stability can provide fundamental knowledge with potential biomedical applications. Oppositely charged amino acids are frequently observed across one another in antiparallel β-sheets. Interestingly, the side chains of natural charged amino acids Asp, Glu, Arg, Lys have different numbers of hydrophobic methylenes linking the backbone to the hydrophilic charged functionalities. To explore the inherent effect of charged amino acid side chain length on antiparallel sheets, the stability of a designed hairpin motif containing charged amino acids with varying side chain lengths at non-hydrogen bonded positions was studied. Peptides with the guest position on the N-terminal strand and the C-terminal strand were investigated by NMR methods. The charged amino acids (Xaa) included negatively charged residues with a carboxylate group (Asp, Glu, Aad in increasing length), positively charged residues with an ammonium group (Dap, Dab, Orn, Lys in increasing length), and positively charged residues with a guanidinium group (Agp, Agb, Arg, Agh in increasing length). The fraction folded and folding free energy for each peptide were derived from the chemical shift deviation data. The stability of the peptides with the charged residues at the N-terminal guest position followed the trends: Asp > Glu > Aad, Dap < Dab < Orn ∼ Lys, and Agb < Arg < Agh < Agp. The stability of the peptides with the charged residues at the C-terminal guest position followed the trends: Asp < Glu < Aad, Dap ∼ Dab < Orn ∼ Lys, and Agb < Arg ∼ Agp < Agh. These trends were rationalized by thermodynamic sheet propensity and cross-strand interactions.
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Affiliation(s)
- Li-Hung Kuo
- Department of Chemistry, National Taiwan University , Taipei 10617, Taiwan
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22
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Yao YC, Xiong J, Wang XM, Li JX, Hu YP. [The presentation of neo gene in chimeric mice obtained from ES cells]. Yi Chuan Xue Bao 2002; 28:1116-9. [PMID: 11797340] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/23/2023]
Abstract
To explore the potentiality of the mouse ES cell line which is employed in our laboratory were transfected with neo gene and selected with G418. Some ES cell clones expressing neo gene were obtained. After ES clones were picked up and expanded, the ES cells were mircoinjected into blastocysts and implanted miceuterus. 60 blastocysts were implanted into 5 mice. Finally, 3 chimeric mice with neo gene were born. PCR was carried out to analyze the presentation of neo gene in tissues of chimeric mice. The results showed that many tissues harbored the neo gene, including skin, liver and blood et al.
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Affiliation(s)
- Y C Yao
- Department of Cell Biology, Second Military Medical University, Shanghai 200433, China
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23
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An T, Huang RQ, Yang Z, Zhang DK, Li GR, Yao YC, Gao J. Alkaloids from Cynanchum komarovii with inhibitory activity against the tobacco mosaic virus. Phytochemistry 2001; 58:1267-1269. [PMID: 11738420 DOI: 10.1016/s0031-9422(01)00382-x] [Citation(s) in RCA: 61] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
A pyrroloisoquinoline alkaloid, 2,3-dimethoxy-6-(3-oxo-butyl)-7,9,10,11,11a,12-hexahydrobenzo[f]pyrrolo[1,2-b]isoquinoline (1), whose structure was determined by spectroscopic methods, was isolated from the aerial parts of Cynanchum komarovii, together with two known alkaloids, 7-demethoxytylophorine (2) and 7-demethoxytylophorine N-oxide (3). Alkaloids 2 and 3 had antiviral activities against tobacco mosaic virus.
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Affiliation(s)
- T An
- Research Institute of Elemento-Organic Chemistry, Nankai University, Tianjin, 300071People's Republic of China
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24
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Zi XY, Yao YC, Xiong J, Li JX, Yan YB, Yu HY, Hu YP. [Detection of Cre recombinase activity in Mx-Cre transgenic mice induced by INF in vitro]. Yi Chuan Xue Bao 2001; 28:822-6. [PMID: 11582740] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/21/2023]
Abstract
The Cre recombinase and its activity in C57-TgN(Mx-Cre) transgenic mice is studied by polymerase chain reaction (PCR), Western blot, immunohistochemistry, immunogold electron microscopy and Southern blot. C57-TgN(Mx-Cre) transgenic mice harbouring cre gene in genomic DNA is demonstrated by PCR, and these mice which are induced by INF-alpha 1b could express Cre recombinase, which is confirmed by Western blot. With immunohistochemistry, we find that the Cre recombinase expresses in hepatocyte cytoplasm and nuclear of C57-TgN(Mx-Cre) transgenic mice. Cre recombinase expressed in hepatocyte cytoplasm and nuclear is further confirmed by immunogold electon microscopy. And it is supported that the Cre recombinase which is created from C57-TgN(Mx-Cre) transgenic mice induced by INF-alpha 1b can direct DNA recombination reaction in vitro. All evidence leads us supporting the view that the Cre recombinase expressed in C57-TgN(Mx-Cre) transgenic mice has activity. Thus we find a method to detect the activity of Cre recombinase in vitro.
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Affiliation(s)
- X Y Zi
- Department of Cell Biology, Second Military Medical University, Shanghai 200433, China
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Yao YC, Zi XY, Li JX, Xiong J, Xie QD, Wang XM, Hu YP. [Generation of Mx-cre transgenic mice]. Yi Chuan Xue Bao 2001; 28:313-6. [PMID: 11329872] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/19/2023]
Abstract
To generate the transgenic mice expressing cyclization recombination enzyme, the recombinant gene, in which the coding region of cre gene is derived by the promoter of mouse Mx gene, was microinjected into pronuclei of fertilized mouse eggs. Founders of transgenic mice harbouring the recombinant gene were screened by polymerase chain reaction (PCR) at genomic DNA level and confirmed by Southern blot. One line of Mx-cre transgenic mice was obtained. Then, the Mx-cre transgenic mouse line was cultured and propagated.
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Affiliation(s)
- Y C Yao
- Department of Cell Biology, Second Military Medical University, Shanghai 200433, China
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26
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Yao YC, Wang XM, Hu YP. [Expression of Trial in mammalian cell and its apoptosis activation in culture cells]. Yi Chuan Xue Bao 2001; 28:482-6. [PMID: 11441662] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/20/2023]
Abstract
To develop a system for expression of Trail in mammalian cell. PCR and sequencing were used to clone and to confirm Trail gene. Then, we constructed the vector for expression of Trail in mammalian cells. HeLa cells, one of sensitive cell lines to Trail, were transfected with the vector DNA. After 48 h, flow cytometry was used to screen HeLa transfected by Trail. 19% of total cells happened to apoptosis. This study conforms that the production of Trail expressing in mammal cell can induce apoptosis and exhibit high bio-active. The results indicate the potential application of Trail to tumor immunotherapy.
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Affiliation(s)
- Y C Yao
- Department of Cell Biology, Second Military Medical University, Shanghai 200433, China
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Abstract
Segregation ratio estimation has long been important in human genetics. A simple truncated binomial model is considered that assumes complete ascertainment and a deterministic genotype-phenotype relationship. A simple but intuitively appealing estimator of the segregation ratio, previously proposed, is shown to have a negative bias. It is also shown that the bias of this estimator can be largely reduced via a randomization device, resulting in a new estimator that has the same large-sample behavior but with a negligible bias (decaying at a geometric rate). Numerical results are given to show the small-sample performance of this new estimator. An extension to incomplete ascertainment is also considered.
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Affiliation(s)
- Y C Yao
- Institute of Statistical Science, Academia Sinica, Taipei, Taiwan, R.O.C.
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Yao YC, Lei ZH, Wang ZH, Li JX, Wang XM, Li H, Hu YP. [Expression of 3'-truncated preS/S gene in transgenic mice]. Yi Chuan Xue Bao 2000; 27:941-6. [PMID: 11209686] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 04/16/2023]
Abstract
The 3'-truncated preS/S region from HBV genome, encoding a transcriptional transactivator, was cloned and a recombination expression vector for 3'-truncated HBV preS/S sequences under the control of the CMV promoter was constructed by recombination DNA techniques. Then, the expression vector DNA was microinjected into pronuclei of fertilized mouse oocytes. Founders of transgenic mice harbouring the recombination gene which can be expressed were screened by polymerase chain reaction (PCR) at genomic DNA level and confirmed by ELISA andlysis at protein level. Two of 15 mice in one series of microinjections showed the expression of 3'-truncated preS/S gene from HBV genome. The expression vector of 3'-truncated preS/S gene might be helpful for further studies of relationship between the expression production of 3'-truncated preS/S sequence and HBV-associated oncogenesis in vitro. The transgenic mice with expressing 3'-truncated preS/S gene will provide new insight into its roles in the development of human hepatocelluar carcinoma (HCC) in vivo.
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Affiliation(s)
- Y C Yao
- Department of Cell Biology, Second Military Medical University, Shanghai 200433, China
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