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Gai Z, Hu S, He Y, Yan S, Wang R, Gong G, Zhao J. L-arginine alleviates heat stress-induced mammary gland injury through modulating CASTOR1-mTORC1 axis mediated mitochondrial homeostasis. Sci Total Environ 2024; 926:172017. [PMID: 38552976 DOI: 10.1016/j.scitotenv.2024.172017] [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] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/22/2024] [Revised: 03/18/2024] [Accepted: 03/25/2024] [Indexed: 04/06/2024]
Abstract
As global warming intensifies, extreme heat is becoming increasingly frequent. These extreme heatwaves have decreased the milk production of dairy animals such as cows and goats and have caused significant damage to the entire dairy industry. It is known that heat stress (HS) can induce the apoptosis and autophagy of mammary epithelial cells (MECs), leading to a decrease in lactating MECs. L-arginine can effectively attenuate HS-induced decreases in milk yield, but the exact mechanisms are not fully understood. In this study, we found that HS upregulated the arginine sensor CASTOR1 in mouse MECs. Arginine activated mTORC1 activity through CASTOR1 and promoted mitochondrial biogenesis through the mTORC1/PGC-1α/NRF1 pathway. Moreover, arginine inhibited mitophagy through the CASTOR1/PINK1/Parkin pathway. Mitochondrial homeostasis ensures ATP synthesis and a stable cellular redox state for MECs under HS, further alleviating HS-induced damage and improving the lactation performance of MECs. In conclusion, these findings reveal the molecular mechanisms by which L-arginine relieves HS-induced mammary gland injury, and suggest that the intake of arginine-based feeds or feed additives is a promising method to increase the milk yield of dairy animals in extreme heat conditions.
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Affiliation(s)
- Zhongchao Gai
- School of Food Science & Engineering, Shaanxi University of Science and Technology, Xi'an 710021, China
| | - Songhao Hu
- School of Food Science & Engineering, Shaanxi University of Science and Technology, Xi'an 710021, China
| | - Yujiao He
- School of Food Science & Engineering, Shaanxi University of Science and Technology, Xi'an 710021, China
| | - Sijia Yan
- School of Food Science & Engineering, Shaanxi University of Science and Technology, Xi'an 710021, China
| | - Ranran Wang
- School of Food Science & Engineering, Shaanxi University of Science and Technology, Xi'an 710021, China
| | - Guoli Gong
- School of Food Science & Engineering, Shaanxi University of Science and Technology, Xi'an 710021, China.
| | - Jieqiong Zhao
- Department of Cardiology, The Second Affiliated Hospital of Air Force Medical University, Xi'an 710038, China.
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2
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Stukel M, Hariasz L, Di Stefano PCF, Rasco BC, Rykaczewski KP, Brewer NT, Stracener DW, Liu Y, Gai Z, Rouleau C, Carter J, Kostensalo J, Suhonen J, Davis H, Lukosi ED, Goetz KC, Grzywacz RK, Mancuso M, Petricca F, Fijałkowska A, Wolińska-Cichocka M, Ninkovic J, Lechner P, Ickert RB, Morgan LE, Renne PR, Yavin I. Rare ^{40}K Decay with Implications for Fundamental Physics and Geochronology. Phys Rev Lett 2023; 131:052503. [PMID: 37595241 DOI: 10.1103/physrevlett.131.052503] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/22/2022] [Revised: 05/09/2023] [Accepted: 05/19/2023] [Indexed: 08/20/2023]
Abstract
Potassium-40 is a widespread, naturally occurring isotope whose radioactivity impacts subatomic rare-event searches, nuclear structure theory, and estimated geological ages. A predicted electron-capture decay directly to the ground state of argon-40 has never been observed. The KDK (potassium decay) collaboration reports strong evidence of this rare decay mode. A blinded analysis reveals a nonzero ratio of intensities of ground-state electron-captures (I_{EC^{0}}) over excited-state ones (I_{EC^{*}}) of I_{EC^{0}}/I_{EC^{*}}=0.0095±[over stat]0.0022±[over sys]0.0010 (68% C.L.), with the null hypothesis rejected at 4σ. In terms of branching ratio, this signal yields I_{EC^{0}}=0.098%±[over stat]0.023%±[over sys]0.010%, roughly half of the commonly used prediction, with consequences for various fields [27L. Hariasz et al., companion paper, Phys. Rev. C 108, 014327 (2023)PRVCAN2469-998510.1103/PhysRevC.108.014327].
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Affiliation(s)
- M Stukel
- Department of Physics, Engineering Physics & Astronomy, Queen's University, Kingston, Ontario K7L 3N6, Canada
| | - L Hariasz
- Department of Physics, Engineering Physics & Astronomy, Queen's University, Kingston, Ontario K7L 3N6, Canada
| | - P C F Di Stefano
- Department of Physics, Engineering Physics & Astronomy, Queen's University, Kingston, Ontario K7L 3N6, Canada
| | - B C Rasco
- Physics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - K P Rykaczewski
- Physics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - N T Brewer
- Physics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
- Joint Institute for Nuclear Physics and Application, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - D W Stracener
- Physics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - Y Liu
- Physics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - Z Gai
- Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - C Rouleau
- Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - J Carter
- Berkeley Geochronology Center, Berkeley, California 94709, USA
| | - J Kostensalo
- Natural Resources Institute Finland, Joensuu FI-80100, Finland
| | - J Suhonen
- Department of Physics, University of Jyväskylä, Jyväskylä FI-40014, Finland
| | - H Davis
- Department of Nuclear Engineering, University of Tennessee, Knoxville, Tennessee 37996, USA
- Joint Institute for Advanced Materials, University of Tennessee, Knoxville, Tennessee 37996, USA
| | - E D Lukosi
- Department of Nuclear Engineering, University of Tennessee, Knoxville, Tennessee 37996, USA
- Joint Institute for Advanced Materials, University of Tennessee, Knoxville, Tennessee 37996, USA
| | - K C Goetz
- Nuclear and Extreme Environments Measurement Group, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - R K Grzywacz
- Physics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
- Joint Institute for Nuclear Physics and Application, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
- Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996, USA
| | - M Mancuso
- Max-Planck-Institut für Physik, Munich D-80805, Germany
| | - F Petricca
- Max-Planck-Institut für Physik, Munich D-80805, Germany
| | - A Fijałkowska
- Faculty of Physics, University of Warsaw, Warsaw PL-02-093, Poland
| | - M Wolińska-Cichocka
- Physics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
- Joint Institute for Nuclear Physics and Application, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
- Heavy Ion Laboratory, University of Warsaw, Warsaw PL-02-093, Poland
| | - J Ninkovic
- MPG Semiconductor Laboratory, Munich D-80805, Germany
| | - P Lechner
- MPG Semiconductor Laboratory, Munich D-80805, Germany
| | - R B Ickert
- Department of Earth, Atmospheric, and Planetary Sciences, Purdue University, West Lafayette, Illinois 47907, USA
| | - L E Morgan
- U.S. Geological Survey, Geology, Geophysics, and Geochemistry Science Center, Denver, Colorado 80225, USA
| | - P R Renne
- Berkeley Geochronology Center, Berkeley, California 94709, USA
- Department of Earth and Planetary Science, University of California, Berkeley, California 94720, USA
| | - I Yavin
- Department of Physics, Engineering Physics & Astronomy, Queen's University, Kingston, Ontario K7L 3N6, Canada
- Physics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
- Joint Institute for Nuclear Physics and Application, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
- Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
- Berkeley Geochronology Center, Berkeley, California 94709, USA
- Natural Resources Institute Finland, Joensuu FI-80100, Finland
- Department of Physics, University of Jyväskylä, Jyväskylä FI-40014, Finland
- Department of Nuclear Engineering, University of Tennessee, Knoxville, Tennessee 37996, USA
- Joint Institute for Advanced Materials, University of Tennessee, Knoxville, Tennessee 37996, USA
- Nuclear and Extreme Environments Measurement Group, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
- Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996, USA
- Max-Planck-Institut für Physik, Munich D-80805, Germany
- Faculty of Physics, University of Warsaw, Warsaw PL-02-093, Poland
- Heavy Ion Laboratory, University of Warsaw, Warsaw PL-02-093, Poland
- MPG Semiconductor Laboratory, Munich D-80805, Germany
- Department of Earth, Atmospheric, and Planetary Sciences, Purdue University, West Lafayette, Illinois 47907, USA
- U.S. Geological Survey, Geology, Geophysics, and Geochemistry Science Center, Denver, Colorado 80225, USA
- Department of Earth and Planetary Science, University of California, Berkeley, California 94720, USA
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3
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Liao S, Tian L, Qi Q, Hu L, Wang M, Gao C, Cui H, Gai Z, Gong G. Transcriptome Analysis of Protocatechualdehyde against Listeria monocytogenes and Its Effect on Chicken Quality Characteristics. Foods 2023; 12:2625. [PMID: 37444363 DOI: 10.3390/foods12132625] [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] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2023] [Revised: 06/29/2023] [Accepted: 07/05/2023] [Indexed: 07/15/2023] Open
Abstract
The development of natural antimicrobial agents offers new strategies for food preservation due to the health hazards associated with the spoilage of meat products caused by microbial contamination. In this paper, the inhibitory mechanism of protocatechualdehyde (PCA) on Listeria monocytogenes was described, and its effect on the preservation of cooked chicken breast was evaluated. The results showed that the minimal inhibitory concentration (MIC) of PCA on L. monocytogenes was 0.625 mg/mL. Secondly, PCA destroyed the integrity of the L. monocytogenes cell membrane, which was manifested as a decrease in membrane hyperpolarization, intracellular ATP level, and intracellular pH value. Field emission gun scanning electron microscopy (FEG-SEM) observed a cell membrane rupture. Transcriptome analysis showed that PCA may inhibit cell growth by affecting amino acid, nucleotide metabolism, energy metabolism, and the cell membrane of L. monocytogenes. Additionally, it was discovered that PCA enhanced the color and texture of cooked chicken breast meat while decreasing the level of thiobarbituric acid active substance (TBARS). In conclusion, PCA as a natural antibacterial agent has a certain reference value in extending the shelf life of cooked chicken breast.
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Affiliation(s)
- Sichen Liao
- School of Food Science and Engineering, Shaanxi University of Science and Technology, Xi'an 710021, China
| | - Lu Tian
- School of Food Science and Engineering, Shaanxi University of Science and Technology, Xi'an 710021, China
| | - Qi Qi
- School of Food Science and Engineering, Shaanxi University of Science and Technology, Xi'an 710021, China
| | - Lemei Hu
- School of Food Science and Engineering, Shaanxi University of Science and Technology, Xi'an 710021, China
| | - Minmin Wang
- School of Food Science and Engineering, Shaanxi University of Science and Technology, Xi'an 710021, China
| | - Chang Gao
- School of Food Science and Engineering, Shaanxi University of Science and Technology, Xi'an 710021, China
| | - Haoyue Cui
- School of Food Science and Engineering, Shaanxi University of Science and Technology, Xi'an 710021, China
| | - Zhongchao Gai
- School of Food Science and Engineering, Shaanxi University of Science and Technology, Xi'an 710021, China
| | - Guoli Gong
- School of Food Science and Engineering, Shaanxi University of Science and Technology, Xi'an 710021, China
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Gai Z, Wang Y, Wang J, Fu J, Tian L, Li X, Zhao J, Gong G. Downregulation of CASTOR1 Inhibits Heat-Stress-Induced Apoptosis and Promotes Casein and Lipid Synthesis in Mammary Epithelial Cells. J Agric Food Chem 2022; 70:5386-5395. [PMID: 35442666 DOI: 10.1021/acs.jafc.2c00877] [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] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
Heat stress is one of the most important factors limiting the milk yields of dairy animals. This decline can be attributed to the heat-stress-induced apoptosis of mammary epithelial cells (MECs). The cytosolic arginine sensor for mTORC1 subunit 1 (CASTOR1) is a crucial upstream regulator of the mechanistic target of rapamycin complex 1 (mTORC1) signaling, which has close connections with apoptosis. However, the specific roles of CASTOR1 in regulating the apoptosis and lactation of MECs are still obscure. In the present study, we found that heat stress promotes apoptosis and CASTOR1's expression in HC11 cells. Downregulation of CASTOR1 inhibits heat-stress-induced apoptosis through a ROS-independent pathway. In addition, silencing of CASTOR1 promotes cell proliferation, cell cycle progression, and milk component synthesis, and overexpressing of CASTOR1 reverses these observations. Furthermore, we found that silencing of CASTOR1 contributes to the nuclear transport of SREBP1 and promotes lipid synthesis. This study demonstrates the pivotal roles of CASTOR1 in heat-stress-induced apoptosis and milk component synthesis in MECs.
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Affiliation(s)
- Zhongchao Gai
- School of Food and Biological Engineering, Shaanxi University of Science and Technology, Xi'an 710021, Shaanxi, China
| | - Yujiao Wang
- School of Food and Biological Engineering, Shaanxi University of Science and Technology, Xi'an 710021, Shaanxi, China
| | - Jie Wang
- School of Food and Biological Engineering, Shaanxi University of Science and Technology, Xi'an 710021, Shaanxi, China
| | - Jiapeng Fu
- School of Food and Biological Engineering, Shaanxi University of Science and Technology, Xi'an 710021, Shaanxi, China
| | - Lu Tian
- School of Food and Biological Engineering, Shaanxi University of Science and Technology, Xi'an 710021, Shaanxi, China
| | - Xue Li
- Department of Cardiology, The Second Affiliated Hospital of Air Force Medical University, Xi'an 710038, Shaanxi, China
| | - Jieqiong Zhao
- Department of Cardiology, The Second Affiliated Hospital of Air Force Medical University, Xi'an 710038, Shaanxi, China
| | - Guoli Gong
- School of Food and Biological Engineering, Shaanxi University of Science and Technology, Xi'an 710021, Shaanxi, China
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5
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Wu M, Tian L, Fu J, Liao S, Li H, Gai Z, Gong G. Antibacterial mechanism of Protocatechuic acid against Yersinia enterocolitica and its application in pork. Food Control 2022. [DOI: 10.1016/j.foodcont.2021.108573] [Citation(s) in RCA: 10] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
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6
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Gai Z, Wang Y, Tian L, Gong G, Zhao J. Whole Genome Level Analysis of the Wnt and DIX Gene Families in Mice and Their Coordination Relationship in Regulating Cardiac Hypertrophy. Front Genet 2021; 12:608936. [PMID: 34168671 PMCID: PMC8217762 DOI: 10.3389/fgene.2021.608936] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/22/2020] [Accepted: 05/17/2021] [Indexed: 12/27/2022] Open
Abstract
The Wnt signaling pathway is an evolutionarily conserved signaling pathway that plays essential roles in embryonic development, organogenesis, and many other biological activities. Both Wnt proteins and DIX proteins are important components of Wnt signaling. Systematic studies of Wnt and DIX families at the genome-wide level may provide a comprehensive landscape to elucidate their functions and demonstrate their relationships, but they are currently lacking. In this report, we describe the correlations between mouse Wnt and DIX genes in family expansion, molecular evolution, and expression levels in cardiac hypertrophy at the genome-wide scale. We observed that both the Wnt and DIX families underwent more expansion than the overall average in the evolutionarily early stage. In addition, mirrortree analyses suggested that Wnt and DIX were co-evolved protein families. Collectively, these results would help to elucidate the evolutionary characters of Wnt and DIX families and demonstrate their correlations in mediating cardiac hypertrophy.
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Affiliation(s)
- Zhongchao Gai
- School of Food and Biological Engineering, Shaanxi University of Science and Technology, Xi'an, China
| | - Yujiao Wang
- School of Food and Biological Engineering, Shaanxi University of Science and Technology, Xi'an, China
| | - Lu Tian
- School of Food and Biological Engineering, Shaanxi University of Science and Technology, Xi'an, China
| | - Guoli Gong
- School of Food and Biological Engineering, Shaanxi University of Science and Technology, Xi'an, China
| | - Jieqiong Zhao
- Department of Cardiology, The Second Affiliated Hospital of Air Force Medical University, Xi'an, China
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Zhao J, Lei Y, Yang Y, Gao H, Gai Z, Li X. Metoprolol alleviates arginine vasopressin-induced cardiomyocyte hypertrophy by upregulating the AKT1-SERCA2 cascade in H9C2 cells. Cell Biosci 2020; 10:72. [PMID: 32489586 PMCID: PMC7247229 DOI: 10.1186/s13578-020-00434-y] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/06/2020] [Accepted: 05/16/2020] [Indexed: 12/20/2022] Open
Abstract
Background Arginine vasopressin (AVP) is elevated in patients with heart failure, and the increase in the AVP concentration in plasma is positively correlated with disease severity and mortality. Metoprolol (Met) is a beta blocker that is widely used in the clinic to treat pathological cardiac hypertrophy and to improve heart function. However, the specific mechanism by which Met alleviates AVP-induced pathological cardiac hypertrophy is still unknown. Our current study aimed to evaluate the inhibitory effects of Met on AVP-induced cardiomyocyte hypertrophy and the underlying mechanisms. Methods AVP alone or AVP plus Met was added to the wild type or AKT1-overexpressing rat cardiac H9C2 cell line. The cell surface areas and ANP/BNP/β-MHC expressions were used to evaluate the levels of hypertrophy. Western bolting was used to analyze AKT1/P-AKT1, AKT2/P-AKT2, total AKT, SERCA2, and Phospholamban (PLN) expression. Fluo3-AM was used to measure the intracellular Ca2+ stores. Results In the current study, we found that AKT1 but not AKT2 mediated the pathogenesis of AVP-induced cardiomyocyte hypertrophy. Sustained stimulation (48 h) with AVP led to hypertrophy in the H9C2 rat cardiomyocytes, resulting in the downregulation of AKT1 (0.48 fold compared to control) and SERCA2 (0.62 fold), the upregulation of PLN (1.32 fold), and the increase in the cytoplasmic calcium concentration (1.52 fold). In addition, AKT1 overexpression increased the expression of SERCA2 (1.34 fold) and decreased the expression of PLN (0.48 fold) in the H9C2 cells. Moreover, we found that Met could attenuate the AVP-induced changes in AKT1, SERCA2 and PLN expression and decreased the cytoplasmic calcium concentration in the H9C2 cells. Conclusions Our results demonstrated that the AKT1-SERCA2 cascade served as an important regulatory pathway in AVP-induced pathological cardiac hypertrophy.
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Affiliation(s)
- Jieqiong Zhao
- Department of Cardiology, Tangdu Hospital, Air Force Medical University, Xi'an, 710038 Shaanxi People's Republic of China
| | - Yonghong Lei
- Department of Plastic Surgery, General Hospital of Chinese PLA, Beijing, 100853 People's Republic of China
| | - Yanping Yang
- Department of Cardiology, Tangdu Hospital, Air Force Medical University, Xi'an, 710038 Shaanxi People's Republic of China
| | - Haibo Gao
- Department of Cardiology, Tangdu Hospital, Air Force Medical University, Xi'an, 710038 Shaanxi People's Republic of China
| | - Zhongchao Gai
- School of Food and Biological Engineering, Shaanxi University of Science and Technology, Xi'an, 710021 Shaanxi People's Republic of China
| | - Xue Li
- Department of Cardiology, Tangdu Hospital, Air Force Medical University, Xi'an, 710038 Shaanxi People's Republic of China
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8
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Zhao J, Wang Y, Li X, Gai Z. Genome-wide identification and characterization of Toll-like receptors (TLRs) in housefly (Musca domestica) and their roles in the insecticide resistance. Int J Biol Macromol 2020; 150:141-151. [DOI: 10.1016/j.ijbiomac.2020.02.061] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/21/2019] [Revised: 02/03/2020] [Accepted: 02/07/2020] [Indexed: 02/06/2023]
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9
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Gai Z, Zhao J. Genome-wide analysis reveals the functional and expressional correlation between RhoGAP and RhoGEF in mouse. Genomics 2020; 112:1694-1706. [DOI: 10.1016/j.ygeno.2019.09.013] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/2019] [Revised: 08/21/2019] [Accepted: 09/17/2019] [Indexed: 12/17/2022]
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10
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Li C, Gai Z, Wang K, Jin L. Retraction Note to: Engineering Bacillus licheniformis as a thermophilic platform for the production of l-lactic acid from lignocellulose-derived sugars. Biotechnol Biofuels 2018; 11:100. [PMID: 29634050 PMCID: PMC5887223 DOI: 10.1186/s13068-018-1086-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/12/2018] [Accepted: 03/12/2018] [Indexed: 06/08/2023]
Abstract
[This retracts the article DOI: 10.1186/s13068-017-0920-z.].
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Affiliation(s)
- Chao Li
- Clinical and Translational Research Center, Shanghai First Maternity and Infant Hospital, Tongji University School of Medicine, Shanghai, 200092 People’s Republic of China
| | - Zhongchao Gai
- State Key Laboratory of Microbial Metabolism, and School of Life Sciences & Biotechnology, Shanghai Jiao Tong University, Shanghai, 200240 People’s Republic of China
| | - Kai Wang
- Clinical and Translational Research Center, Shanghai First Maternity and Infant Hospital, Tongji University School of Medicine, Shanghai, 200092 People’s Republic of China
| | - Liping Jin
- Clinical and Translational Research Center, Shanghai First Maternity and Infant Hospital, Tongji University School of Medicine, Shanghai, 200092 People’s Republic of China
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11
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Kulaberoglu Y, Lin K, Holder M, Gai Z, Gomez M, Assefa Shifa B, Mavis M, Hoa L, Sharif AAD, Lujan C, Smith ESJ, Bjedov I, Tapon N, Wu G, Hergovich A. Stable MOB1 interaction with Hippo/MST is not essential for development and tissue growth control. Nat Commun 2017; 8:695. [PMID: 28947795 PMCID: PMC5612953 DOI: 10.1038/s41467-017-00795-y] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2017] [Accepted: 07/28/2017] [Indexed: 01/07/2023] Open
Abstract
The Hippo tumor suppressor pathway is essential for development and tissue growth control, encompassing a core cassette consisting of the Hippo (MST1/2), Warts (LATS1/2), and Tricornered (NDR1/2) kinases together with MOB1 as an important signaling adaptor. However, it remains unclear which regulatory interactions between MOB1 and the different Hippo core kinases coordinate development, tissue growth, and tumor suppression. Here, we report the crystal structure of the MOB1/NDR2 complex and define key MOB1 residues mediating MOB1's differential binding to Hippo core kinases, thereby establishing MOB1 variants with selective loss-of-interaction. By studying these variants in human cancer cells and Drosophila, we uncovered that MOB1/Warts binding is essential for tumor suppression, tissue growth control, and development, while stable MOB1/Hippo binding is dispensable and MOB1/Trc binding alone is insufficient. Collectively, we decrypt molecularly, cell biologically, and genetically the importance of the diverse interactions of Hippo core kinases with the pivotal MOB1 signal transducer.The Hippo tumor suppressor pathway is essential for development and tissue growth control. Here the authors employ a multi-disciplinary approach to characterize the interactions of the three Hippo kinases with the signaling adaptor MOB1 and show how they differently affect development, tissue growth and tumor suppression.
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Affiliation(s)
- Yavuz Kulaberoglu
- Tumour Suppressor Signalling Network Laboratory, UCL Cancer Institute, University College London, London, WC1E 6BT, UK
- Department of Pharmacology, University of Cambridge, Cambridge, CB2 1PD, UK
| | - Kui Lin
- State Key Laboratory of Microbial Metabolism, School of Life Sciences & Biotechnology, Shanghai Jiao Tong University, Shanghai, 200240, China
| | - Maxine Holder
- Apoptosis and Proliferation Control Laboratory, Francis Crick Institute, London, NW1 1BF, UK
| | - Zhongchao Gai
- State Key Laboratory of Microbial Metabolism, School of Life Sciences & Biotechnology, Shanghai Jiao Tong University, Shanghai, 200240, China
| | - Marta Gomez
- Tumour Suppressor Signalling Network Laboratory, UCL Cancer Institute, University College London, London, WC1E 6BT, UK
| | - Belul Assefa Shifa
- Tumour Suppressor Signalling Network Laboratory, UCL Cancer Institute, University College London, London, WC1E 6BT, UK
| | - Merdiye Mavis
- Tumour Suppressor Signalling Network Laboratory, UCL Cancer Institute, University College London, London, WC1E 6BT, UK
| | - Lily Hoa
- Tumour Suppressor Signalling Network Laboratory, UCL Cancer Institute, University College London, London, WC1E 6BT, UK
| | - Ahmad A D Sharif
- Tumour Suppressor Signalling Network Laboratory, UCL Cancer Institute, University College London, London, WC1E 6BT, UK
| | - Celia Lujan
- Molecular Biology of Cancer laboratory, UCL Cancer Institute, University College London, London, WC1E 6BT, UK
| | - Ewan St John Smith
- Department of Pharmacology, University of Cambridge, Cambridge, CB2 1PD, UK
| | - Ivana Bjedov
- Molecular Biology of Cancer laboratory, UCL Cancer Institute, University College London, London, WC1E 6BT, UK
| | - Nicolas Tapon
- Apoptosis and Proliferation Control Laboratory, Francis Crick Institute, London, NW1 1BF, UK
| | - Geng Wu
- State Key Laboratory of Microbial Metabolism, School of Life Sciences & Biotechnology, Shanghai Jiao Tong University, Shanghai, 200240, China.
| | - Alexander Hergovich
- Tumour Suppressor Signalling Network Laboratory, UCL Cancer Institute, University College London, London, WC1E 6BT, UK.
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12
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Li C, Gai Z, Wang K, Jin L. Engineering Bacillus licheniformis as a thermophilic platform for the production of l-lactic acid from lignocellulose-derived sugars. Biotechnol Biofuels 2017; 10:235. [PMID: 29046721 PMCID: PMC5637338 DOI: 10.1186/s13068-017-0920-z] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/27/2017] [Accepted: 10/03/2017] [Indexed: 05/03/2023]
Abstract
BACKGROUND Bacillus licheniformis MW3 as a GRAS and thermophilic strain is a promising microorganism for chemical and biofuel production. However, its capacity to co-utilize glucose and xylose, the major sugars found in lignocellulosic biomass, is severely impaired by glucose-mediated carbon catabolite repression (CCR). In this study, a "dual-channel" process was implemented to engineer strain MW3 for simultaneous utilization of glucose and xylose, using l-lactic acid as a target product. RESULTS A non-phosphotransferase system (PTS) glucose uptake route was activated via deletion of the glucose transporter gene ptsG and introduction of the galactose permease gene galP. After replacing the promoter of glucokinase gene glck with the strong promoter Pals, the engineered strain recovered glucose consumption and utilized glucose and xylose simultaneously. Meanwhile, to improve the consumption rate of xylose in this strain, several measures were undertaken, such as relieving the regulation of the xylose repressor XylR, reducing the catabolite-responsive element, and optimizing the rate-limiting step. Knockout of ethanol and acetic acid pathway genes further increased lactic acid yield by 6.2%. The resultant strain, RH15, was capable of producing 121.9 g/L l-lactic acid at high yield (95.3%) after 40 h of fermentation from a mixture of glucose and xylose. When a lignocellulosic hydrolysate was used as the substrate, 99.3 g/L l-lactic acid was produced within 40 h, with a specific productivity of 2.48 g/[L h] and a yield of 94.6%. CONCLUSIONS Our engineered strain B. licheniformis RH15 could thermophilically produced l-lactic acid from lignocellulosic hydrolysate with relatively high concentration and productivity at levels that were competitive with most reported cases of l-lactic acid-producers. Thus, the engineered strain might be used as a platform for the production of other chemicals. In addition to engineering the B. licheniformis strain, the "dual-channel" process might serve as an alternative method for engineering a variety of other strains.
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Affiliation(s)
- Chao Li
- Clinical and Translational Research Center, Shanghai First Maternity and Infant Hospital, Tongji University School of Medicine, Shanghai, 200092 People’s Republic of China
| | - Zhongchao Gai
- State Key Laboratory of Microbial Metabolism, and School of Life Sciences & Biotechnology, Shanghai Jiao Tong University, Shanghai, 200240 People’s Republic of China
| | - Kai Wang
- Clinical and Translational Research Center, Shanghai First Maternity and Infant Hospital, Tongji University School of Medicine, Shanghai, 200092 People’s Republic of China
| | - Liping Jin
- Clinical and Translational Research Center, Shanghai First Maternity and Infant Hospital, Tongji University School of Medicine, Shanghai, 200092 People’s Republic of China
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13
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Gai Z, Wang Q, Yang C, Wang L, Deng W, Wu G. Structural mechanism for the arginine sensing and regulation of CASTOR1 in the mTORC1 signaling pathway. Cell Discov 2016; 2:16051. [PMID: 28066558 PMCID: PMC5187391 DOI: 10.1038/celldisc.2016.51] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/28/2016] [Accepted: 12/12/2016] [Indexed: 12/12/2022] Open
Abstract
The mTOR complex I (mTORC1) signaling pathway controls many metabolic processes and is regulated by amino acid signals, especially arginine. CASTOR1 has been identified as the cytosolic arginine sensor for the mTORC1 pathway, but the molecular mechanism of how it senses arginine is elusive. Here, by determining the crystal structure of human CASTOR1 in complex with arginine, we found that an exquisitely tailored pocket, carved between the NTD and the CTD domains of CASTOR1, is employed to recognize arginine. Mutation of critical residues in this pocket abolished or diminished arginine binding. By comparison with structurally similar aspartate kinases, a surface patch of CASTOR1-NTD on the opposite side of the arginine-binding site was identified to mediate direct physical interaction with its downstream effector GATOR2, via GATOR2 subunit Mios. Mutation of this surface patch disrupted CASTOR1’s recognition and inhibition of GATOR2, revealed by in vitro pull-down assay. Normal mode (NM) analysis revealed an ‘open’-to-‘closed’ conformational change for CASTOR1, which is correlated to the switching between the exposing and concealing of its GATOR2-binding residues, and is most likely related to arginine binding. Interestingly, the GATOR2-binding sites on the two protomers of CASTOR1 dimer face the same direction, which prompted us to propose a model for how dimerization of CASTOR1 relieves the inhibition of GATOR1 by GATOR2. Our study thus provides a thorough analysis on how CASTOR1 recognizes arginine, and describes a possible mechanism of how arginine binding induces the inter-domain movement of CASTOR1 to affect its association with GATOR2.
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Affiliation(s)
- Zhongchao Gai
- State Key Laboratory of Microbial Metabolism, School of Life Sciences & Biotechnology, Shanghai Jiao Tong University , Shanghai, China
| | - Qian Wang
- National Center for Protein Science Shanghai , Shanghai, China
| | - Can Yang
- State Key Laboratory of Microbial Metabolism, School of Life Sciences & Biotechnology, Shanghai Jiao Tong University , Shanghai, China
| | - Lei Wang
- State Key Laboratory of Microbial Metabolism, School of Life Sciences & Biotechnology, Shanghai Jiao Tong University , Shanghai, China
| | - Wei Deng
- National Center for Protein Science Shanghai , Shanghai, China
| | - Geng Wu
- State Key Laboratory of Microbial Metabolism, School of Life Sciences & Biotechnology, Shanghai Jiao Tong University , Shanghai, China
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14
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Liu ZQ, Li L, Gai Z, Clarkson JD, Hsu SL, Wong AT, Fan LS, Lin MW, Rouleau CM, Ward TZ, Lee HN, Sefat AS, Christen HM, Ramesh R. Full Electroresistance Modulation in a Mixed-Phase Metallic Alloy. Phys Rev Lett 2016; 116:097203. [PMID: 26991197 DOI: 10.1103/physrevlett.116.097203] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/19/2015] [Indexed: 06/05/2023]
Abstract
We report a giant, ∼22%, electroresistance modulation for a metallic alloy above room temperature. It is achieved by a small electric field of 2 kV/cm via piezoelectric strain-mediated magnetoelectric coupling and the resulting magnetic phase transition in epitaxial FeRh/BaTiO_{3} heterostructures. This work presents detailed experimental evidence for an isothermal magnetic phase transition driven by tetragonality modulation in FeRh thin films, which is in contrast to the large volume expansion in the conventional temperature-driven magnetic phase transition in FeRh. Moreover, all the experimental results in this work illustrate FeRh as a mixed-phase model system well similar to phase-separated colossal magnetoresistance systems with phase instability therein.
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Affiliation(s)
- Z Q Liu
- Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
- Department of Materials Science and Engineering, University of California, Berkeley, California 94720, USA
| | - L Li
- Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - Z Gai
- Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - J D Clarkson
- Department of Materials Science and Engineering, University of California, Berkeley, California 94720, USA
| | - S L Hsu
- Department of Materials Science and Engineering, University of California, Berkeley, California 94720, USA
| | - A T Wong
- Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
- Materials Science and Engineering, University of Tennessee, Knoxville, Tennessee 37996, USA
| | - L S Fan
- Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - M-W Lin
- Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - C M Rouleau
- Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - T Z Ward
- Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - H N Lee
- Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - A S Sefat
- Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - H M Christen
- Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - R Ramesh
- Department of Materials Science and Engineering, University of California, Berkeley, California 94720, USA
- Department of Physics, University of California, Berkeley, California 94720, USA
- Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
- Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
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15
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Gai Z, Chu W, Deng W, Li W, Li H, He A, Nellist M, Wu G. Structure of the TBC1D7-TSC1 complex reveals that TBC1D7 stabilizes dimerization of the TSC1 C-terminal coiled coil region. J Mol Cell Biol 2016; 8:411-425. [PMID: 26798146 DOI: 10.1093/jmcb/mjw001] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.3] [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: 10/28/2015] [Revised: 12/03/2015] [Accepted: 12/10/2015] [Indexed: 01/01/2023] Open
Abstract
TSC1 and TSC2 mutations account for the majority of tuberous sclerosis complex cases. The TSC1 and TSC2 proteins assemble into a complex that is stabilized by TBC1D7 through its direct interaction with the TSC1 coiled coil (CC) region. Loss of TBC1D7 is associated with intellectual disability and megalencephaly. Here, we determine the crystal structure of the complex between TBC1D7 and the C-terminal part (residues 939-992) of TSC1-CC. The structure reveals that two TSC1-CCs form a parallel homodimer, which results in the formation of two symmetric surfaces for interaction with TBC1D7. TBC1D7 employs its α4 and α5 helices to interact with the α1 helix of one TSC1 (939-992) molecule mainly through hydrophobic interactions, and simultaneously associates with the other TSC1 (939-992) molecule using the C-terminal tip of its α4 helix. Biochemical and cell biological data demonstrate that TBC1D7 indeed substantially stabilizes the homodimerization of TSC1-CC, and mutations to the critical interface residues greatly compromise this effect. Together, our data reveal the molecular mechanism underlying TBC1D7-mediated stabilization of TSC1 dimerization, and its contribution to the structural integrity of the holo-TSC complex.
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Affiliation(s)
- Zhongchao Gai
- State Key Laboratory of Microbial Metabolism, School of Life Sciences & Biotechnology, Shanghai Jiao Tong University, Shanghai, China
| | - Wendan Chu
- The China National Center for Protein Sciences (Beijing) Tsinghua University Branch, Beijing, China
| | - Wei Deng
- National Center for Protein Science Shanghai, Shanghai, China
| | - Wenqi Li
- The China National Center for Protein Sciences (Beijing) Tsinghua University Branch, Beijing, China
| | - Hua Li
- State Key Laboratory of Microbial Metabolism, School of Life Sciences & Biotechnology, Shanghai Jiao Tong University, Shanghai, China
| | - Ailiang He
- State Key Laboratory of Microbial Metabolism, School of Life Sciences & Biotechnology, Shanghai Jiao Tong University, Shanghai, China
| | - Mark Nellist
- Department of Clinical Genetics, Erasmus Medical Center, Rotterdam, The Netherlands
| | - Geng Wu
- State Key Laboratory of Microbial Metabolism, School of Life Sciences & Biotechnology, Shanghai Jiao Tong University, Shanghai, China
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16
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Leite Ferreira B, Brandão P, Dos Santos A, Gai Z, Cruz C, Reis M, Santos T, Félix V. Heptacopper(II) and dicopper(II)-adenine complexes: synthesis, structural characterization, and magnetic properties. J COORD CHEM 2015. [DOI: 10.1080/00958972.2015.1061126] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Affiliation(s)
| | - Paula Brandão
- TEMA−NRD, Departamento de Engenharia Mecânica, Universidade de Aveiro, Aveiro, Portugal
| | - A.M. Dos Santos
- Quantum Condensed Matter Division, Oak Ridge National Laboratory, Oak Ridge, TN, USA
| | - Z. Gai
- Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, TN, USA
| | - C. Cruz
- Instituto de Física, Universidade Federal Fluminense, Niterói, Brazil
| | - M.S. Reis
- Instituto de Física, Universidade Federal Fluminense, Niterói, Brazil
| | - T.M. Santos
- CICECO, Departamento de Química, Universidade de Aveiro, Aveiro, Portugal
| | - V. Félix
- CICECO, Departamento de Química, Universidade de Aveiro, Aveiro, Portugal
- iBiMED, Departamento de Química, Universidade de Aveiro, Aveiro, Portugal
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17
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Zhang KHL, Du Y, Sushko PV, Bowden ME, Shutthanandan V, Qiao L, Cao GX, Gai Z, Sallis S, Piper LFJ, Chambers SA. Electronic and magnetic properties of epitaxial perovskite SrCrO₃(0 0 1). J Phys Condens Matter 2015; 27:245605. [PMID: 26037231 DOI: 10.1088/0953-8984/27/24/245605] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
We have investigated the intrinsic properties of SrCrO3 epitaxial thin films synthesized by molecular beam epitaxy. We find compelling evidence that SrCrO3 is a correlated metal. X-ray photoemission valence band and O K-edge x-ray absorption spectra indicate a strongly hybridized Cr3d-O2p state crossing the Fermi level, leading to metallic behavior. Comparison between valence band spectra near the Fermi level and the densities of states calculated using density functional theory (DFT) suggests the presence of coherent and incoherent states and points to strong electron correlation effects. The magnetic susceptibility can be described by Pauli paramagnetism at temperatures above 100 K, but reveals antiferromagnetic behavior at lower temperatures, possibly resulting from orbital ordering.
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Affiliation(s)
- K H L Zhang
- Physical Sciences Division, Fundamental & Computational Sciences Directorate, Pacific Northwest National Laboratory, Richland, WA 99352, USA. Department of Materials Science and Metallurgy, University of Cambridge, Cambridge, CB3 0FS, UK
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18
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Jiang J, Zhang X, Huo R, Li X, Yang Y, Gai Z, Xu M, Shen L, Cai L, Wan C, Li B, He L, Qin S. Association study of UGT1A9 promoter polymorphisms with DILI based on systematically regional variation screen in Chinese population. Pharmacogenomics J 2014; 15:326-31. [PMID: 25446781 DOI: 10.1038/tpj.2014.75] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/27/2014] [Revised: 09/09/2014] [Accepted: 10/09/2014] [Indexed: 02/05/2023]
Abstract
Drug-induced liver injury (DILI) is caused by unpredictable adverse drug reaction due mainly to the accumulation of hepatotoxic compounds in the liver resulting in significant damage. Drug-metabolizing enzymes have been prime targets for molecular studies relevant to DILI. The gene UGT1A9 mainly expresses in the liver and has an important role in drug metabolism. The Han Chinese has a very long and complex demographic history, and the population stratification arising from the interplay of different geographic areas may influence the polymorphism pattern. We selected 260 healthy subjects in three different geographic areas (including Xian, Shanghai and Liuzhou) for systemic screening and analysis of single-nucleotide polymorphisms (SNPs) in the promoter region of UGT1A9. Eight SNPs were identified and no regional disparity exists among the three populations. Based on these results, 213 DILI patients from all over the Chinese mainland were further recruited to investigate possible association between UGT1A9 and DILI. We observed statistically significant associations between SNP rs2741045 and DILI at both allele and genotype levels (allele: P=0.032; genotype: P=0.029; after Bonferroni correction). Also, multivariate interaction analysis discovered the interaction between rs2741045 and age associated with DILI significantly. This is the first such screening study to investigate the association between UGT1A9 promoter polymorphisms and DILI in the Chinese population and it could provide the basis for further study of DILI mechanisms.
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Affiliation(s)
- J Jiang
- 1] Bio-X Institutes, Key Laboratory for the Genetics of Developmental and Neuropsychiatric Disorders (Ministry of Education), Shanghai Jiao Tong University, Shanghai, China [2] Shanghai Genome Pilot Institutes for Genomics and Human Health, Shanghai, China
| | - X Zhang
- Department of Pharmacy, Shanghai Pulmonary Hospital, Tongji University School of Medicine, Shanghai, China
| | - R Huo
- 1] Bio-X Institutes, Key Laboratory for the Genetics of Developmental and Neuropsychiatric Disorders (Ministry of Education), Shanghai Jiao Tong University, Shanghai, China [2] Shanghai Genome Pilot Institutes for Genomics and Human Health, Shanghai, China
| | - X Li
- 1] Bio-X Institutes, Key Laboratory for the Genetics of Developmental and Neuropsychiatric Disorders (Ministry of Education), Shanghai Jiao Tong University, Shanghai, China [2] Shanghai Genome Pilot Institutes for Genomics and Human Health, Shanghai, China
| | - Y Yang
- General Hospital of Ningxia Medical University, YinChuan, China
| | - Z Gai
- Jinan Infectious Disease Hospital, Shandong University, Jinan, China
| | - M Xu
- 1] Bio-X Institutes, Key Laboratory for the Genetics of Developmental and Neuropsychiatric Disorders (Ministry of Education), Shanghai Jiao Tong University, Shanghai, China [2] Shanghai Genome Pilot Institutes for Genomics and Human Health, Shanghai, China
| | - L Shen
- 1] Bio-X Institutes, Key Laboratory for the Genetics of Developmental and Neuropsychiatric Disorders (Ministry of Education), Shanghai Jiao Tong University, Shanghai, China [2] Shanghai Genome Pilot Institutes for Genomics and Human Health, Shanghai, China
| | - L Cai
- 1] Bio-X Institutes, Key Laboratory for the Genetics of Developmental and Neuropsychiatric Disorders (Ministry of Education), Shanghai Jiao Tong University, Shanghai, China [2] Shanghai Genome Pilot Institutes for Genomics and Human Health, Shanghai, China
| | - C Wan
- 1] Bio-X Institutes, Key Laboratory for the Genetics of Developmental and Neuropsychiatric Disorders (Ministry of Education), Shanghai Jiao Tong University, Shanghai, China [2] Shanghai Genome Pilot Institutes for Genomics and Human Health, Shanghai, China
| | - B Li
- 1] Bio-X Institutes, Key Laboratory for the Genetics of Developmental and Neuropsychiatric Disorders (Ministry of Education), Shanghai Jiao Tong University, Shanghai, China [2] Shanghai Genome Pilot Institutes for Genomics and Human Health, Shanghai, China
| | - L He
- 1] Bio-X Institutes, Key Laboratory for the Genetics of Developmental and Neuropsychiatric Disorders (Ministry of Education), Shanghai Jiao Tong University, Shanghai, China [2] Shanghai Genome Pilot Institutes for Genomics and Human Health, Shanghai, China [3] Children's Hospital and Institutes of Biomedical Sciences, Fudan University, Shanghai, China
| | - S Qin
- 1] Bio-X Institutes, Key Laboratory for the Genetics of Developmental and Neuropsychiatric Disorders (Ministry of Education), Shanghai Jiao Tong University, Shanghai, China [2] Shanghai Genome Pilot Institutes for Genomics and Human Health, Shanghai, China
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Gai Z, Zhang X, Islam M, Wang X, Li A, Yang Y, Li Y, Peng J, Hong H, Liu K. Characterization of Atg8 in lepidopteran insect cells. Arch Insect Biochem Physiol 2013; 84:57-77. [PMID: 23959953 DOI: 10.1002/arch.21114] [Citation(s) in RCA: 9] [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] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
Yeast Atg8 and mammalian microtubule-associated protein light chain 3 (LC3) are landmark proteins essential for autophagy. Here the lepidopteran Atg8, a homolog of LC3, is characterized. Sequence analysis reveals that Atg8 proteins are highly conserved in lepidopteran species. The abundance of endogeous Atg8 and the ratios of Atg8 conjugation to phosphatidylethanolamine (Atg8-PE)/Atg8 are different among several lepidopteran cell lines and different tissues of Helicoverpa armigera larvae. Both the density of fluorescent pre-autophagosomal structures with GFP-Ha Atg8 and the abundance of Atg6 are positively correlated with levels of Atg8-PE in different cell lines. The mutant GFP-Atg8(G116A) has lost the function in punctual formation, suggesting that G116 is important for autophagy. Exogenous factors have significant influences on the conversion of Atg8 in lepidopteran cells. Bacillus thuringiensis enhances the degradation of Atg8 in Spodoptera litura Sl-HP cells. Atg8-PE degrades gradually with extension of amino acid starvation, and bafilomycin A1 can block the decrease through the inhibition of autophagosome fusion with lysosome. Interestingly, high pH is more effective than amino acid starvation in Bombyx mori Bme cells to induce the conversion of BmAtg8 to BmAgt8-PE. Change of the quality of fetal bovine serum in the culture medium results in alteration of the ratio of Atg8-PE/Atg8 in some lepidopteran cell lines.
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Affiliation(s)
- Zhongchao Gai
- College of Life Sciences, Central China Normal University, Wuhan City, P. R. China
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20
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Gai Z, Zhang X, Wang X, Peng J, Li Y, Liu K, Hong H. Differential proteomic analysis of Trichoplusia ni cells after continuous selection with activated Cry1Ac toxin. Cytotechnology 2012; 65:425-35. [PMID: 23070538 DOI: 10.1007/s10616-012-9496-4] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/18/2012] [Accepted: 08/29/2012] [Indexed: 12/19/2022] Open
Abstract
Development of insect resistance to Bacillus thuringiensis (Bt) toxins threatens the sustained successful application of Bt-based biological control tactics. Multi-mechanisms of resistance have been proposed, such as alteration of toxin-binding proteins, changes of proteases in midgut and so on. The other responses of the Cry1Ac-selected insects might also contribute to the evolution of resistance. Here, the Cry1Ac-selected Trichoplusia ni TnH5 cells with high resistance were subjected to analysis of proteome and the differentially expressed proteins were identified using mass spectrometry. The differential proteins included transporter, molecular chaperon, structural molecules and many other molecules involved in protein metabolism, signal transduction, nucleotide binding, lipid biosynthesis, carbohydrates metabolism and energy production, suggesting that a complex mechanisms involved in the development of insect resistance to Bt Cry1Ac toxins at cellular levels. The decrease of protein synthesis, changes of signal transduction, more rapid energy production, the enhanced lipid synthesis and the decline of possible Cry1Ac-binding proteins in cytoplasm and other events might contribute to the development of resistance in the selected cells. Our results provide some new cues for understanding the mechanism of Bt resistance.
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Affiliation(s)
- Zhongchao Gai
- College of Life Sciences, Central China Normal University, Luoyu Road 152, Wuhan City, 430079, Hubei Province, People's Republic of China
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21
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Pramanick A, Lauter V, Wang XL, An K, Ambaye H, Goyette Jr RJ, Yi J, Gai Z, Stoica AD. Polarized neutron diffraction at a spallation source for magnetic studies. J Appl Crystallogr 2012. [DOI: 10.1107/s0021889812034474] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
Abstract
The availability of high-power spallation neutron sources, along with advances in the development of coupled moderators and neutron polarizers, has made it possible to use polarized neutrons on time-of-flight diffractometers forin situstudies of phenomena contributing to field-induced magnetization of a material. Different electronic and structural phenomena that contribute to the overall magnetization of a material can be studied and clearly identified with polarized neutron diffraction measurements. This article reports the first results from polarized neutron diffraction experiments on a time-of-flight instrument at a spallation source. Magnetic field-induced rotation of electron spins in an Ni–Mn–Ga single crystal was measured with polarized neutron diffraction at the MAGICS reflectometer at the Spallation Neutron Source at Oak Ridge National Laboratory. The difference in intensities measured with spin-up and spin-down polarized neutrons is proportional to the field-induced magnetization of the crystal. The polarized neutron measurements indicate that the magnetic form factor for the 3delectrons of Mn in Ni–Mn–Ga is lower than the value reported earlier for an ideal spherical symmetry of electronic distribution. Future experiments for studying field-induced magnetization in materials following the current methodology are outlined.
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Liu K, Shu D, Song N, Gai Z, Yuan Y, Li J, Li M, Guo S, Peng J, Hong H. The role of cytochrome c on apoptosis induced by Anagrapha falcifera multiple nuclear polyhedrosis virus in insect Spodoptera litura cells. PLoS One 2012; 7:e40877. [PMID: 22952575 PMCID: PMC3429461 DOI: 10.1371/journal.pone.0040877] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/22/2011] [Accepted: 06/17/2012] [Indexed: 12/12/2022] Open
Abstract
There are conflicting reports on the role of cytochrome c during insect apoptosis. Our previous studies have showed that cytochrome c released from the mitochondria was an early event by western blot analysis and caspase-3 activation was closely related to cytochrome c release during apoptosis induced by baculovirus in Spodoptera litura cells (Sl-1 cell line). In the present study, alteration in mitochondrial morphology was observed by transmission electron microscopy, and cytochrome c release from mitochondria in apoptotic Sl-1 cells induced with Anagrapha falcifera multiple nuclear polyhedrosis virus (AfMNPV) has further been confirmed by immunofluoresence staining protocol, suggesting that structural disruption of mitochondria and the release of cytochrome c are important events during Lepidoptera insect cell apoptosis. We also used Sl-1 cell-free extract system and the technique of RNA interference to further investigate the role of cytochrome c in apoptotic Sl-1 cells induced by AfMNPV. Caspase-3 activity in cell- free extracts supplemented with exogenous cytochrome c was determined and showed an increase with the extension of incubation time. DsRNA-mediated silencing of cytochrome c resulted in the inhibition of apoptosis and protected the cells from AfMNPV-induced cell death. Silencing of expression of cytochrome c had a remarkable effect on pro-caspase-3 and pro-caspase-9 activation and resulted in the reduction of caspase-3 and caspase-9 activity in Sl-1 cells undergoing apoptosis. Caspase-9 inhibitor could inhibit activation of pro-caspase-3, and the inhibition of the function of Apaf-1 with FSBA blocked apoptosis, hinting that Apaf-1 could be involved in Sl-1 cell apoptosis induced by AfMNPV. Taken together, these results strongly demonstrate that cytochrome c plays an important role in apoptotic signaling pathways in Lepidopteran insect cells.
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Affiliation(s)
- Kaiyu Liu
- Institute of Entomology, Central China Normal University, Wuhan, People's Republic of China
- Key Laboratory of Pesticide & Chemical Biology, Ministry of Education, Central China Normal University, Wuhan, People's Republic of China
| | - Duanyang Shu
- Institute of Entomology, Central China Normal University, Wuhan, People's Republic of China
| | - Na Song
- Institute of Entomology, Central China Normal University, Wuhan, People's Republic of China
| | - Zhongchao Gai
- Institute of Entomology, Central China Normal University, Wuhan, People's Republic of China
| | - Yuan Yuan
- Institute of Entomology, Central China Normal University, Wuhan, People's Republic of China
| | - Juan Li
- Institute of Entomology, Central China Normal University, Wuhan, People's Republic of China
| | - Min Li
- Institute of Entomology, Central China Normal University, Wuhan, People's Republic of China
| | - Shuying Guo
- Institute of Entomology, Central China Normal University, Wuhan, People's Republic of China
| | - Jianxin Peng
- Institute of Entomology, Central China Normal University, Wuhan, People's Republic of China
- Key Laboratory of Pesticide & Chemical Biology, Ministry of Education, Central China Normal University, Wuhan, People's Republic of China
- * E-mail:
| | - Huazhu Hong
- Institute of Entomology, Central China Normal University, Wuhan, People's Republic of China
- Key Laboratory of Pesticide & Chemical Biology, Ministry of Education, Central China Normal University, Wuhan, People's Republic of China
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Ward TZ, Gai Z, Xu XY, Guo HW, Yin LF, Shen J. Tuning the metal-insulator transition in manganite films through surface exchange coupling with magnetic nanodots. Phys Rev Lett 2011; 106:157207. [PMID: 21568612 DOI: 10.1103/physrevlett.106.157207] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/19/2010] [Indexed: 05/30/2023]
Abstract
In strongly correlated electronic systems, the global transport behavior depends sensitively on spin ordering. We show that spin ordering in manganites can be controlled by depositing isolated ferromagnetic nanodots at the surface. The exchange field at the interface is tunable with nanodot density and makes it possible to overcome dimensionality and strain effects in frustrated systems to greatly increasing the metal-insulator transition and magnetoresistance. These findings indicate that electronic phase separation can be controlled by the presence of magnetic nanodots.
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Affiliation(s)
- T Z Ward
- Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37830, USA.
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Fuchigami K, Gai Z, Ward TZ, Yin LF, Snijders PC, Plummer EW, Shen J. Tunable metallicity of the La5/8Ca3/8MnO3(001) surface by an oxygen overlayer. Phys Rev Lett 2009; 102:066104. [PMID: 19257611 DOI: 10.1103/physrevlett.102.066104] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/10/2008] [Indexed: 05/27/2023]
Abstract
We studied the surface structure of La_{5/8}Ca_{3/8}MnO_{3}(001) thin films using in situ scanning tunneling microscopy (STM). Atomically resolved STM images reveal that a (sqrt[2]xsqrt[2])R45;{ degrees } reconstructed surface and a (1x1) surface can be converted back and forth through adsorption and desorption of oxygen at the surface. The electrical properties of the surfaces are investigated by scanning tunneling spectroscopy. I-V curves clearly show that the presence of an oxygen overlayer renders the surface insulating while the (1x1) surface without the oxygen overlayer is metallic.
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Affiliation(s)
- K Fuchigami
- Materials Sciences and Technology Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
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Torija MA, Gai Z, Myoung N, Plummer EW, Shen J. Frozen low-spin interface in ultrathin Fe films on Cu(111). Phys Rev Lett 2005; 95:027201. [PMID: 16090711 DOI: 10.1103/physrevlett.95.027201] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/16/2005] [Indexed: 05/03/2023]
Abstract
In ultrathin film systems, it is a major challenge to understand how a thickness-driven phase transition proceeds along the cross-sectional direction of the films. We use ultrathin Fe films on Cu(111) as a prototype system to demonstrate how to obtain such information using an in situ scanning tunneling microscope and the surface magneto-optical Kerr effect. The magnetization depth profile of a thickness-driven low-spin to high-spin magnetic phase transition is deduced from the experimental data, which leads us to conclude that a low-spin Fe layer at the Fe/Cu interface stays live upon the phase transition. The magnetically live low-spin phase is believed to be induced by a frozen fcc Fe layer that survives a thickness-driven fcc-->bcc structural transition.
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Affiliation(s)
- M A Torija
- Condensed Matter Sciences Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
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26
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Pierce JP, Torija MA, Gai Z, Shi J, Schulthess TC, Farnan GA, Wendelken JF, Plummer EW, Shen J. Ferromagnetic stability in Fe nanodot assemblies on Cu(111) induced by indirect coupling through the substrate. Phys Rev Lett 2004; 92:237201. [PMID: 15245191 DOI: 10.1103/physrevlett.92.237201] [Citation(s) in RCA: 4] [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: 02/23/2004] [Indexed: 05/24/2023]
Abstract
We report collective ferromagnetic behavior with high Curie temperatures (T(c)) in Fe dot assemblies supported by the Cu(111) surface. Our ability to tune the average size and spacing of the individual dots allows us to conclude that enhanced magnetic anisotropy cannot account for this high-T(c) ferromagnetic order. Because our Monte Carlo simulations have ruled out the dipolar interaction as the dominant factor in this system, we attribute the origin of the ferromagnetic order to indirect exchange coupling via the Cu(111) substrate.
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Affiliation(s)
- J P Pierce
- Condensed Matter Sciences Division, Oak Ridge National Laboratory, and Department of Physics and Astronomy, The University of Tennessee, Knoxville, USA
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Farnan GA, Fu CL, Gai Z, Krcmar M, Baddorf AP, Zhang Z, Shen J. Electronic stability of magnetic Fe/Co superlattices with monatomic layer alternation. Phys Rev Lett 2003; 91:226106. [PMID: 14683255 DOI: 10.1103/physrevlett.91.226106] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/26/2003] [Indexed: 05/24/2023]
Abstract
We report a surprising observation that the growth of the [Fe(1 ML)/Co(1 ML)](n) superlattice of L1(0) structure on Cu(100) is stable only up to six atomic layers (n=3), which cannot be rationalized by stress arguments. Instead, first-principles calculations reveal a transition from the L1(0) to the B2 structure due to the effect of dimensionality on the stability of the electronic structure of the superlattice. Whereas the majority-spin electrons are energetically insensitive to the layer thickness, the minority-spin electrons induce the transition at n=3.
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Affiliation(s)
- G A Farnan
- Condensed Matter Sciences Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA
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Gai Z, Ji H, Gao B, Zhao RG, Yang WS. Surface structure of the (3 x 1) and (3 x 2) reconstructions of Ge(113). Phys Rev B Condens Matter 1996; 54:8593-8599. [PMID: 9984536 DOI: 10.1103/physrevb.54.8593] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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29
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Gai Z, Yu H, Yang WS. Adatom diffusion on Ge(111) and the corresponding activation energy barrier. Phys Rev B Condens Matter 1996; 53:13547-13550. [PMID: 9983101 DOI: 10.1103/physrevb.53.13547] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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Gai Z, Zhao RG, He Y, Ji H, Hu C, Yang WS. Chemisorption of group-III metals on the (111) surface of group-IV semiconductors: In/Ge(111). Phys Rev B Condens Matter 1996; 53:1539-1547. [PMID: 9983617 DOI: 10.1103/physrevb.53.1539] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Gai Z, He Y, Yu H, Yang WS. Observation of conductance quantization of ballistic metallic point contacts at room temperature. Phys Rev B Condens Matter 1996; 53:1042-1045. [PMID: 9983550 DOI: 10.1103/physrevb.53.1042] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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