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Han A, Wang X, Tang K, Zhang Z, Ye C, Kong K, Hu H, Zheng L, Jiang P, Zhao C, Zhang Q, Wang D, Li Y. An Adjacent Atomic Platinum Site Enables Single-Atom Iron with High Oxygen Reduction Reaction Performance. Angew Chem Int Ed Engl 2021; 60:19262-19271. [PMID: 34156746 DOI: 10.1002/anie.202105186] [Citation(s) in RCA: 100] [Impact Index Per Article: 33.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/15/2021] [Revised: 06/17/2021] [Indexed: 12/18/2022]
Abstract
The modulation effect has been widely investigated to tune the electronic state of single-atomic M-N-C catalysts to enhance the activity of oxygen reduction reaction (ORR). However, the in-depth study of modulation effect is rarely reported for the isolated dual-atomic metal sites. Now, the catalytic activities of Fe-N4 moiety can be enhanced by the adjacent Pt-N4 moiety through the modulation effect, in which the Pt-N4 acts as the modulator to tune the 3d electronic orbitals of Fe-N4 active site and optimize ORR activity. Inspired by this principle, we design and synthesize the electrocatalyst that comprises isolated Fe-N4 /Pt-N4 moieties dispersed in the nitrogen-doped carbon matrix (Fe-N4 /Pt-N4 @NC) and exhibits a half-wave potential of 0.93 V vs. RHE and negligible activity degradation (ΔE1/2 =8 mV) after 10000 cycles in 0.1 M KOH. We also demonstrate that the modulation effect is not effective for optimizing the ORR performances of Co-N4 /Pt-N4 and Mn-N4 /Pt-N4 systems.
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Affiliation(s)
- Ali Han
- Department of Chemistry, Tsinghua University, Beijing, 100084, China
| | - Xijun Wang
- Hefei National Laboratory for Physical Sciences at the Microscale, CAS Center for Excellence in Nanoscience, School of Chemistry and Materials Science, University of Science and Technology of China, Hefei, Anhui, 230026, China
| | - Kun Tang
- School of Physics and Materials Science, Anhui University, Hefei, 230601, China
| | - Zedong Zhang
- Department of Chemistry, Tsinghua University, Beijing, 100084, China
| | - Chenliang Ye
- Department of Chemistry, Tsinghua University, Beijing, 100084, China
| | - Kejian Kong
- Department of Chemistry, Tsinghua University, Beijing, 100084, China
| | - Haibo Hu
- School of Physics and Materials Science, Anhui University, Hefei, 230601, China
| | - Lirong Zheng
- Beijing Synchrotron Radiation Facility Institute of High Energy Physics, Chinese Academy of Sciences, No. 19 Yuquan Road, Beijing, 100049, China
| | - Peng Jiang
- Department of Chemistry, Tsinghua University, Beijing, 100084, China
| | - Changxin Zhao
- Beijing Key Laboratory of Green Chemical Reaction Engineering and Technology Department of Chemical Engineering, Tsinghua University, Beijing, 100084, China
| | - Qiang Zhang
- Beijing Key Laboratory of Green Chemical Reaction Engineering and Technology Department of Chemical Engineering, Tsinghua University, Beijing, 100084, China
| | - Dingsheng Wang
- Department of Chemistry, Tsinghua University, Beijing, 100084, China
| | - Yadong Li
- Department of Chemistry, Tsinghua University, Beijing, 100084, China
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Dong W, Huang K, Yan Y, Wan P, Peng Y, Zeng X, Cao Y. Long-Term Consumption of 2- O-β-d-Glucopyranosyl-l-ascorbic Acid from the Fruits of Lycium barbarum Modulates Gut Microbiota in C57BL/6 Mice. J Agric Food Chem 2020; 68:8863-8874. [PMID: 32706586 DOI: 10.1021/acs.jafc.0c04007] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
The modulating effect of 2-O-β-d-glucopyranosyl-l-ascorbic acid (AA-2βG), a natural derivative of ascorbic acid from the fruits of Lycium barbarum, on mice gut microbiota was investigated in the present study. It was found that AA-2βG was able to adjust the structure of mice gut microbiota, elevated the relative abundances of Verrucomicrobia, Porphyromonadaceae, Verrucomicrobiaceae, and Erysipelotrichaceae, and meanwhile reduced the relative abundances of Firmicutes, Lachnospiraceae, Rikenellaceae, Ruminococcaceae, Bdellovibrionaceae, Anaeroplasmataceae, and Peptococcaceae. Through the linear discriminant analysis effect size analysis, the key microbiota that were found to be significantly changed after long-term consumption of AA-2βG were Ruminococcaceae, Porphyromonadaceae, Lachnospiraceae, and Rikenellaceae. In addition, AA-2βG could upregulate pro-inflammatory cytokines, promote tight junctions between intestinal cells, facilitate the generation of short-chain fatty acids (SCFAs), and upregulate the mRNA expression level of SCFAs receptors, indicating that AA-2βG might promote organism health. The results demonstrated that AA-2βG might maintain organism health by modulating gut microbiota.
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Affiliation(s)
- Wei Dong
- College of Food Science and Technology, Nanjing Agricultural University, Nanjing 210095, China
| | - Kaiyin Huang
- College of Food Science and Technology, Nanjing Agricultural University, Nanjing 210095, China
| | - Yamei Yan
- Institute of Wolfberry Engineering Technology, Ningxia Academy of Agriculture and Forestry Sciences, Yinchuan, 750002, Ningxia, China
- National Wolfberry Engineering Research Center, Yinchuan 750002, Ningxia, China
| | - Peng Wan
- College of Food Science and Technology, Nanjing Agricultural University, Nanjing 210095, China
| | - Yujia Peng
- College of Food Science and Technology, Nanjing Agricultural University, Nanjing 210095, China
| | - Xiaoxiong Zeng
- College of Food Science and Technology, Nanjing Agricultural University, Nanjing 210095, China
| | - Youlong Cao
- Institute of Wolfberry Engineering Technology, Ningxia Academy of Agriculture and Forestry Sciences, Yinchuan, 750002, Ningxia, China
- National Wolfberry Engineering Research Center, Yinchuan 750002, Ningxia, China
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Rahmani A, Mathien C, Bidault A, Le Goïc N, Paillard C, Pichereau V. External pH modulation during the growth of Vibrio tapetis, the aetiological agent of brown ring disease. J Appl Microbiol 2020; 129:3-16. [PMID: 32395854 DOI: 10.1111/jam.14699] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2020] [Revised: 05/04/2020] [Accepted: 05/04/2020] [Indexed: 02/05/2023]
Abstract
AIMS Brown ring disease (BRD) is an infection of the Manila clam Ruditapes philippinarum due to the pathogen Vibrio tapetis. During BRD, clams are facing immunodepression and shell biomineralization alteration. In this paper, we studied the role of pH on the growth of the pathogen and formulated hypothesis on the establishment of BRD by V. tapetis. METHODS AND RESULTS In this study, we monitored the evolution of pH during the growth of V. tapetis in a range of pH and temperatures. We also measured the pH of Manila clam haemolymph and extrapallial fluids (EPFs) during infection by V. tapetis. We highlighted that V. tapetis modulates the external pH during its growth, to a value of 7·70. During the development of BRD, V. tapetis also influences EPFs and haemolymph pH in vitro in the first hours of exposure and in vivo after 3 days of infection. CONCLUSIONS Our experiments have shown a close interaction between V. tapetis CECT4600, a pathogen of Manila clam that induces BRD, and the pH of different compartments of the animals during infection. These results indicate that the bacterium, through a direct mechanism or as a consequence of physiological changes encountered in the animal during infection, is able to interfere with the pH of Manila clam fluids. This pH modification might promote the infection process or at least create an imbalance within the animal that would favour its persistence. This last hypothesis should be tested in future experiment. SIGNIFICANCE AND IMPACT OF THE STUDY This study is the first observation of pH modifications in the context of BRD and might orient future research on the fine mechanisms of pH modulation associated with BRD.
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Affiliation(s)
- A Rahmani
- Univ Brest, CNRS, IRD, Ifremer, UMR 6539 LEMAR, Plouzané, France
| | - C Mathien
- Univ Brest, CNRS, IRD, Ifremer, UMR 6539 LEMAR, Plouzané, France
| | - A Bidault
- Univ Brest, CNRS, IRD, Ifremer, UMR 6539 LEMAR, Plouzané, France
| | - N Le Goïc
- Univ Brest, CNRS, IRD, Ifremer, UMR 6539 LEMAR, Plouzané, France
| | - C Paillard
- Univ Brest, CNRS, IRD, Ifremer, UMR 6539 LEMAR, Plouzané, France
| | - V Pichereau
- Univ Brest, CNRS, IRD, Ifremer, UMR 6539 LEMAR, Plouzané, France
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Kutovyi Y, Zadorozhnyi I, Handziuk V, Hlukhova H, Boichuk N, Petrychuk M, Vitusevich S. Liquid-Gated Two-Layer Silicon Nanowire FETs: Evidence of Controlling Single-Trap Dynamic Processes. Nano Lett 2018; 18:7305-7313. [PMID: 30346789 DOI: 10.1021/acs.nanolett.8b03508] [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] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
We fabricate two-layer (TL) silicon nanowires (NW) field-effect transistors (FETs) with a liquid gate. The NW devices show advanced characteristics, which reflect reliable single-electron phenomena. A strong modulation effect of channel conductivity with effectively tuned parameters is revealed. The effect opens up prospects for applications in several research fields including bioelectronics and sensing applications. Our results shed light on the nature of single trap dynamics which parameters can be fine-tuned to enhance the sensitivity of liquid-gated TL silicon nanowire FETs.
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Affiliation(s)
- Yurii Kutovyi
- Bioelectronics (ICS-8) , Forschungszentrum Jülich , 52428 Jülich , Germany
| | - Ihor Zadorozhnyi
- Bioelectronics (ICS-8) , Forschungszentrum Jülich , 52428 Jülich , Germany
| | - Volodymyr Handziuk
- Bioelectronics (ICS-8) , Forschungszentrum Jülich , 52428 Jülich , Germany
| | - Hanna Hlukhova
- Bioelectronics (ICS-8) , Forschungszentrum Jülich , 52428 Jülich , Germany
| | - Nazarii Boichuk
- Bioelectronics (ICS-8) , Forschungszentrum Jülich , 52428 Jülich , Germany
| | - Mykhaylo Petrychuk
- Bioelectronics (ICS-8) , Forschungszentrum Jülich , 52428 Jülich , Germany
- Faculty of Radiophysics, Electronics and Computer Systems , Taras Shevchenko National University of Kyiv , 03127 Kyiv , Ukraine
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