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Chen XC, Wang A, Wang JJ, Zhang ZD, Yu JY, Yan YJ, Zhang JY, Niu J, Cui XY, Liu XH. Influences of coexisting aged polystyrene microplastics on the ecological and health risks of cadmium in soils: A leachability and oral bioaccessibility based study. J Hazard Mater 2024; 469:133884. [PMID: 38412647 DOI: 10.1016/j.jhazmat.2024.133884] [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: 11/08/2023] [Revised: 01/22/2024] [Accepted: 02/22/2024] [Indexed: 02/29/2024]
Abstract
Whether coexisting microplastics (MPs) affect the ecological and health risks of cadmium (Cd) in soils is a cutting-edge scientific issue. In this study, four typical Chinese soils were prepared as artificially Cd-contaminated soils with/without aged polystyrene (PS). TCLP and in vitro PBET model were used to determine the leachability (ecological risk) and oral bioaccessibility (human health risk) of soil Cd. The mechanisms by which MPs influence soil Cd were discussed from direct and indirect perspectives. Results showed that there was no significant difference in the leachability of soil Cd with/without aged PS. Additionally, aged PS led to a significant decrease in the bioaccessibility of soil Cd in gastric phase, but not in small intestinal phase. The increase in surface roughness and the new characteristic peaks (e.g., Si-O-Si) of aged PS directly accounted for the change in Cd bioaccessibility. The change in organic matter content indirectly accounted for the exceptional increase in Cd bioaccessibility of black soil with aged PS in small intestinal phase. Furthermore, the changes in cation exchange capacity and Cd mobility factor caused by aged PS explained the change in Cd leachability. These results contribute to a deeper understanding about environmental and public health in complicated emerging scenarios.
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Affiliation(s)
- Xiao-Chen Chen
- Innovation Center for Soil Remediation and Restoration Technologies, College of Environment and Safety Engineering, Fuzhou University, 2 Wulongjiangbei Road, Fuzhou 350108, PR China
| | - Ao Wang
- Innovation Center for Soil Remediation and Restoration Technologies, College of Environment and Safety Engineering, Fuzhou University, 2 Wulongjiangbei Road, Fuzhou 350108, PR China
| | - Jun-Jie Wang
- Innovation Center for Soil Remediation and Restoration Technologies, College of Environment and Safety Engineering, Fuzhou University, 2 Wulongjiangbei Road, Fuzhou 350108, PR China; Fuzhou City Construction Design and Research Institute Co., Ltd., 340 Liuyibei Road, Fuzhou 350001, PR China
| | - Zeng-Di Zhang
- Innovation Center for Soil Remediation and Restoration Technologies, College of Environment and Safety Engineering, Fuzhou University, 2 Wulongjiangbei Road, Fuzhou 350108, PR China
| | - Jian-Ying Yu
- Innovation Center for Soil Remediation and Restoration Technologies, College of Environment and Safety Engineering, Fuzhou University, 2 Wulongjiangbei Road, Fuzhou 350108, PR China; The Second Geological Exploration Institute, China Metallurgical Geology Bureau, 1 Kejidong Road, Fuzhou 350108, PR China
| | - Ying-Jie Yan
- Innovation Center for Soil Remediation and Restoration Technologies, College of Environment and Safety Engineering, Fuzhou University, 2 Wulongjiangbei Road, Fuzhou 350108, PR China; Fuzhou University Zhicheng College, 50 Yangqiaoxi Road, Fuzhou 350002, PR China
| | - Jian-Yu Zhang
- Jiangsu Longchang Chemical Co., Ltd., 1 Qianjiang Road, Rugao 226532, PR China
| | - Jia Niu
- Center of Safe and Energy-Saving Engineering Technology for Urban Water Supply and Drainage System, School of Ecological Environment and Urban Construction, Fujian University of Technology, 33 Xuefunan Road, Fuzhou 350118, PR China
| | - Xiao-Yu Cui
- School of Environmental Science and Engineering, Tianjin University, 135 Yaguan Road, Tianjin 300354, PR China
| | - Xian-Hua Liu
- School of Environmental Science and Engineering, Tianjin University, 135 Yaguan Road, Tianjin 300354, PR China.
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2
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Chen XC, Huang ZJ, Wang A, Yu JY, Zhang JY, Xiao ZJ, Cui XY, Liu XH, Yin NY, Cui YS. Immobilisation remediation of arsenic-contaminated soils with promising CaAl-layered double hydroxide and bioavailability, bioaccessibility, and speciation-based health risk assessment. J Hazard Mater 2024; 469:134096. [PMID: 38522195 DOI: 10.1016/j.jhazmat.2024.134096] [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: 10/21/2023] [Revised: 03/13/2024] [Accepted: 03/19/2024] [Indexed: 03/26/2024]
Abstract
Arsenic (As)-contaminated soil poses great health risk to human mostly through inadvertent oral exposure. We investigated CaAl-layered double hydroxide (CaAl-LDH), a promising immobilising agent, for the remediation of As-contaminated Chinese soils. The effects on specific soil properties and As fractionation were analyzed, and changes in the health risk of soil As were accurately assessed by means of advanced in vivo mice model and in vitro PBET-SHIME model. Results showed that the application of CaAl-LDH significantly increased soil pH and concentration of Fe and Al oxides, and effectively converted active As fractions into the most stable residual fraction, guaranteeing long-term remediation stability. Based on in vivo test, As relative bioavailability was significantly reduced by 37.75%. Based on in vitro test, As bioaccessibility in small intestinal and colon phases was significantly reduced by 25.65% and 28.57%, respectively. Furthermore, As metabolism (reduction and methylation) by the gut microbiota inhabiting colon was clearly observed. After immobilisation with CaAl-LDH, the concentration of bioaccessible As(Ⅴ) in the colon fluid was significantly reduced by 61.91%, and organic As (least toxic MMA(V) and DMA(V)) became the main species, which further reduced the health risk of soil As. In summary, CaAl-LDH proved to be a feasible option for immobilisation remediation of As-contaminated soils, and considerable progress was made in relevant health risk assessment.
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Affiliation(s)
- Xiao-Chen Chen
- Innovation Center for Soil Remediation and Restoration Technologies, College of Environment and Safety Engineering, Fuzhou University, 2 Wulongjiangbei Road, Fuzhou 350108, PR China
| | - Zhen-Jia Huang
- Innovation Center for Soil Remediation and Restoration Technologies, College of Environment and Safety Engineering, Fuzhou University, 2 Wulongjiangbei Road, Fuzhou 350108, PR China; Zhongke Tongheng Environmental Technology Co. Ltd.,1300 Jimei Road, Xiamen 361021, PR China
| | - Ao Wang
- Innovation Center for Soil Remediation and Restoration Technologies, College of Environment and Safety Engineering, Fuzhou University, 2 Wulongjiangbei Road, Fuzhou 350108, PR China
| | - Jian-Ying Yu
- Innovation Center for Soil Remediation and Restoration Technologies, College of Environment and Safety Engineering, Fuzhou University, 2 Wulongjiangbei Road, Fuzhou 350108, PR China; The Second Geological Exploration Institute, China Metallurgical Geology Bureau, 1 Kejidong Road, Fuzhou 350108, PR China
| | - Jian-Yu Zhang
- Jiangsu Longchang Chemical Co. Ltd., 1 Qianjiang Road, Rugao 226532, PR China
| | - Zi-Jun Xiao
- Quanzhou Yangyu Soil Technology Co. Ltd., 9 Huize Road, Quanzhou 362100, PR China
| | - Xiao-Yu Cui
- School of Environmental Science and Engineering, Tianjin University, 135 Yaguan Road, Tianjin 300350, PR China
| | - Xian-Hua Liu
- School of Environmental Science and Engineering, Tianjin University, 135 Yaguan Road, Tianjin 300350, PR China
| | - Nai-Yi Yin
- College of Resources and Environment, University of Chinese Academy of Sciences, 380 Huaibeizhuang, Beijing 101408, PR China
| | - Yan-Shan Cui
- College of Resources and Environment, University of Chinese Academy of Sciences, 380 Huaibeizhuang, Beijing 101408, PR China.
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Cui XY, Jiang S, Wang CC, Yang JY, Zhao YC, Xue CH, Wang YM, Zhang TT. Comparative Analyses of EPA-Phosphatidylcholine, EPA-Lysophosphatidylcholine, and DHA-Lysophosphatidylcholine on DHA and EPA Repletion in n-3 PUFA-Deficient Mice. J Agric Food Chem 2022; 70:13327-13339. [PMID: 36197792 DOI: 10.1021/acs.jafc.2c06462] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/16/2023]
Abstract
Docosahexaenoic acid (DHA) and eicosapentaenoic acid (EPA) play an important role in maintaining the physiological functions of tissues, and the beneficial effects of DHA/EPA in phospholipid forms have been widely reported. Although lysophosphatidylcholine (LPC) is considered to be the preferred form of DHA supplementation for the brain, the kinetics of DHA and EPA recovery and corresponding changes of n-6 docosapentaenoic acid (DPA) and arachidonic acid (AA) levels in different phospholipid molecules and different tissues after administration of EPA in phosphatidylcholine (PC) and LPC forms and DHA in the LPC form are not clear. Here, we measured the total fatty acids in tissues and fatty acid composition of different phospholipid molecules after gavage administration of equal molar amounts of EPA/DHA in mice with n-3 polyunsaturated fatty acid (PUFA) deficiency induced by maternal dietary deprivation of n-3 PUFA during pregnancy and lactation. The results showed that dietary supplementation with EPA-PC, EPA-LPC, and DHA-LPC exhibited different priorities for EPA or DHA accretion and supplementation efficiency curves in different tissues during the developing period. EPA-PC exhibited a more optimal efficacy in DHA and EPA repletion in serum and hepatic total fatty acids. In terms of DHA recovery in the brain, EPA-LPC and DHA-LPC showed great effects. Meanwhile, the DHA level in total fatty acids and major fractions of phospholipids (PC, PE, and PI + PS) in the heart and bone marrow with the supplementation of DHA-LPC displayed a relatively considerable increase compared with that of EPA supplementation groups. The study provides a reference for the time course of DHA or EPA recovery in phospholipid molecular species in different tissues after the supplementation of EPA-PC, EPA-LPC, and DHA-LPC.
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Affiliation(s)
- Xiao-Yu Cui
- College of Food Science and Engineering, Ocean University of China, No. 5 Yushan Road, Qingdao 266003, P. R. China
| | - Shan Jiang
- College of Food Science and Engineering, Ocean University of China, No. 5 Yushan Road, Qingdao 266003, P. R. China
| | - Cheng-Cheng Wang
- College of Food Science and Engineering, Ocean University of China, No. 5 Yushan Road, Qingdao 266003, P. R. China
| | - Jin-Yue Yang
- College of Food Science and Engineering, Ocean University of China, No. 5 Yushan Road, Qingdao 266003, P. R. China
| | - Ying-Cai Zhao
- College of Food Science and Engineering, Ocean University of China, No. 5 Yushan Road, Qingdao 266003, P. R. China
| | - Chang-Hu Xue
- College of Food Science and Engineering, Ocean University of China, No. 5 Yushan Road, Qingdao 266003, P. R. China
- Laboratory of Marine Drugs & Biological Products, Pilot National Laboratory for Marine Science and Technology (Qingdao), Qingdao 266237, Shandong, P. R. China
| | - Yu-Ming Wang
- College of Food Science and Engineering, Ocean University of China, No. 5 Yushan Road, Qingdao 266003, P. R. China
- Laboratory of Marine Drugs & Biological Products, Pilot National Laboratory for Marine Science and Technology (Qingdao), Qingdao 266237, Shandong, P. R. China
| | - Tian-Tian Zhang
- College of Food Science and Engineering, Ocean University of China, No. 5 Yushan Road, Qingdao 266003, P. R. China
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Yu JC, Lu JZ, Cui XY, Guo L, Wang ZJ, Liu YD, Wang F, Qi MF, Liu YF, Li TL. Melatonin mediates reactive oxygen species homeostasis via SlCV to regulate leaf senescence in tomato plants. J Pineal Res 2022; 73:e12810. [PMID: 35620796 DOI: 10.1111/jpi.12810] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [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: 03/03/2022] [Revised: 05/08/2022] [Accepted: 05/21/2022] [Indexed: 11/28/2022]
Abstract
Melatonin (MT) functions in removing reactive oxygen species (ROS) and delaying plant senescence, thereby acting as an antioxidant; however, the molecular mechanism underlying the specific action of MT is unclear. Herein, we used the mutant plants carrying the MT decomposition gene melatonin 3-hydroxylase (M3H) in tomato to elucidate the specific mechanism of action of MT. SlM3H-OE accelerated senescence by decreasing the content of endogenous MT in plants. SlM3H is a senescence-related gene that positively regulates aging. MT inhibited the expression of the senescence-related gene SlCV to scavenge ROS, induced stable chloroplast structure, and delayed leaf senescence. Simultaneously, MT weakened the interaction between SlCV and SlPsbO/SlCAT3, reduced ROS production in photosystem II, and promoted ROS elimination. In conclusion, MT regulates ROS homeostasis and delays leaf aging in tomato plants through SlCV expression modulation.
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Affiliation(s)
- Jun-Chi Yu
- College of Horticulture, Shenyang Agricultural University, Shenyang, People's Republic of China
- Key Laboratory of Protected Horticulture of Education Ministry and Liaoning Province, Shenyang, People's Republic of China
| | - Jia-Zhi Lu
- College of Horticulture, Shenyang Agricultural University, Shenyang, People's Republic of China
- Key Laboratory of Protected Horticulture of Education Ministry and Liaoning Province, Shenyang, People's Republic of China
| | - Xiao-Yu Cui
- College of Horticulture, Shenyang Agricultural University, Shenyang, People's Republic of China
- Key Laboratory of Protected Horticulture of Education Ministry and Liaoning Province, Shenyang, People's Republic of China
| | - Lei Guo
- College of Horticulture, Shenyang Agricultural University, Shenyang, People's Republic of China
- Key Laboratory of Protected Horticulture of Education Ministry and Liaoning Province, Shenyang, People's Republic of China
| | - Zhi-Jun Wang
- College of Horticulture, Shenyang Agricultural University, Shenyang, People's Republic of China
- Key Laboratory of Protected Horticulture of Education Ministry and Liaoning Province, Shenyang, People's Republic of China
| | - Yu-Dong Liu
- Agricultural Department, Shihezi University, Shihezi, People's Republic of China
| | - Feng Wang
- College of Horticulture, Shenyang Agricultural University, Shenyang, People's Republic of China
- Key Laboratory of Protected Horticulture of Education Ministry and Liaoning Province, Shenyang, People's Republic of China
| | - Ming-Fang Qi
- College of Horticulture, Shenyang Agricultural University, Shenyang, People's Republic of China
- Key Laboratory of Protected Horticulture of Education Ministry and Liaoning Province, Shenyang, People's Republic of China
| | - Yu-Feng Liu
- College of Horticulture, Shenyang Agricultural University, Shenyang, People's Republic of China
- Key Laboratory of Protected Horticulture of Education Ministry and Liaoning Province, Shenyang, People's Republic of China
| | - Tian-Lai Li
- College of Horticulture, Shenyang Agricultural University, Shenyang, People's Republic of China
- Key Laboratory of Protected Horticulture of Education Ministry and Liaoning Province, Shenyang, People's Republic of China
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Gou ZC, Lu MJ, Cui XY, Wang XQ, Jiang MY, Wang YS, Wang ZQ, Yu XX, Tang SS, Chen G, Su YJ. Enhanced laccase production by mutagenized Myrothecium verrucaria using corn stover as a carbon source and its potential in the degradation of 2-chlorophen. Bioprocess Biosyst Eng 2022; 45:1581-1593. [PMID: 35932338 DOI: 10.1007/s00449-022-02767-z] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [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: 04/14/2022] [Accepted: 07/30/2022] [Indexed: 12/18/2022]
Abstract
Chlorophenols are widely used in industry and are known environmental pollutants. The degradation of chlorophenols is important for environmental remediation. In this study, we evaluated the biodegradation of 2-chlorophenol using crude laccase produced by Myrothecium verrucaria. Atmospheric and room temperature plasma technology was used to increase laccase production. The culture conditions of the M-6 mutant were optimized. Our results showed that corn stover could replace glucose as a carbon source and promote laccase production. The maximum laccase activity of 30.08 U/mL was achieved after optimization, which was a 19.04-fold increase. The biodegradation rate of 2-chlorophenol using crude laccase was 97.13%, a positive correlation was determined between laccase activity and degradation rate. The toxicity of 2-CP was substantially reduced after degradation by laccase solution. Our findings show the feasibility of the use of corn stover in laccase production by M. verrucaria mutant and the subsequent biodegradation of 2-chlorophenol using crude laccase.
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Affiliation(s)
- Ze-Chang Gou
- College of Life Sciences, Jilin Agricultural University, Changchun, 130118, Jilin, China.,Key Laboratory of Straw Comprehensive Utilization and Black Soil Conservation, Ministry of Education, Changchun, 130118, Jilin, China
| | - Min-Jie Lu
- College of Life Sciences, Jilin Agricultural University, Changchun, 130118, Jilin, China.,Key Laboratory of Straw Comprehensive Utilization and Black Soil Conservation, Ministry of Education, Changchun, 130118, Jilin, China
| | - Xiao-Yu Cui
- College of Life Sciences, Jilin Agricultural University, Changchun, 130118, Jilin, China.,Key Laboratory of Straw Comprehensive Utilization and Black Soil Conservation, Ministry of Education, Changchun, 130118, Jilin, China
| | - Xi-Qing Wang
- College of Food Science Technology and Chemical Engineering, Hubei University of Arts and Science, Xiangyang, 441000, Hubei, China
| | - Mei-Yi Jiang
- College of Life Sciences, Jilin Agricultural University, Changchun, 130118, Jilin, China.,Key Laboratory of Straw Comprehensive Utilization and Black Soil Conservation, Ministry of Education, Changchun, 130118, Jilin, China
| | - Ya-Shuo Wang
- College of Life Sciences, Jilin Agricultural University, Changchun, 130118, Jilin, China.,Key Laboratory of Straw Comprehensive Utilization and Black Soil Conservation, Ministry of Education, Changchun, 130118, Jilin, China
| | - Zi-Qi Wang
- College of Life Sciences, Jilin Agricultural University, Changchun, 130118, Jilin, China.,Key Laboratory of Straw Comprehensive Utilization and Black Soil Conservation, Ministry of Education, Changchun, 130118, Jilin, China
| | - Xiao-Xiao Yu
- College of Life Sciences, Jilin Agricultural University, Changchun, 130118, Jilin, China.,Key Laboratory of Straw Comprehensive Utilization and Black Soil Conservation, Ministry of Education, Changchun, 130118, Jilin, China
| | - Shan-Shan Tang
- College of Life Sciences, Jilin Agricultural University, Changchun, 130118, Jilin, China.,Key Laboratory of Straw Comprehensive Utilization and Black Soil Conservation, Ministry of Education, Changchun, 130118, Jilin, China
| | - Guang Chen
- College of Life Sciences, Jilin Agricultural University, Changchun, 130118, Jilin, China.,Key Laboratory of Straw Comprehensive Utilization and Black Soil Conservation, Ministry of Education, Changchun, 130118, Jilin, China
| | - Ying-Jie Su
- College of Life Sciences, Jilin Agricultural University, Changchun, 130118, Jilin, China. .,Key Laboratory of Straw Comprehensive Utilization and Black Soil Conservation, Ministry of Education, Changchun, 130118, Jilin, China.
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Li H, Wang XH, Li Q, Xu P, Liu ZN, Xu M, Cui XY. GmCIPK21, a CBL-interacting protein kinase confers salt tolerance in soybean (Glycine max. L). Plant Physiol Biochem 2022; 184:47-55. [PMID: 35642834 DOI: 10.1016/j.plaphy.2022.05.027] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [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: 03/07/2022] [Revised: 05/04/2022] [Accepted: 05/20/2022] [Indexed: 06/15/2023]
Abstract
Salt stress severely affects plant development and yield. Calcineurin B-like protein interacting protein kinases (CIPKs) play a crucial role in plant adaptation to environmental challenges. However, the biological functions of CIPKs in soybean remain poorly understood. Here, we identified GmCIPK21, a salt-responsive CIPK gene from soybean. Overexpression of GmCIPK21 in Arabidopsis and soybean hairy roots led to increased salt tolerance. The hairy roots with GmCIPK21 suppression by RNA interference exhibited salt-sensitive phenotypes. Further physiological analysis revealed that GmCIPK21 reduced the content of hydrogen peroxide (H2O2) and malondialdehyde (MDA) and increased the activity of the antioxidant enzymes under salt stress. Additionally, GmCIPK21 was found to enhance the ABA sensitivity of transgenic plants. GmCIPK21 was also implicated in increasing the activation of antioxidant-, salt-, and ABA-related genes upon salt stress. Interestingly, GmCIPK21 interacted with GmCBL4, promoting the scavenging salt-induced reactive oxygen species (ROS). These results collectively suggested that GmCIPK21 affects ROS homeostasis and ABA response to improve salt tolerance in soybean.
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Affiliation(s)
- Hui Li
- College of Agriculture and Forestry Sciences, Linyi University, Linyi, 276000, China; Center for International Education, Philippine Christian University, 1004, Philippines.
| | - Xiao-Hua Wang
- College of Agriculture and Forestry Sciences, Linyi University, Linyi, 276000, China.
| | - Qiang Li
- College of Agriculture and Forestry Sciences, Linyi University, Linyi, 276000, China.
| | - Ping Xu
- College of Agriculture and Forestry Sciences, Linyi University, Linyi, 276000, China.
| | - Zhen-Ning Liu
- College of Agriculture and Forestry Sciences, Linyi University, Linyi, 276000, China.
| | - Meng Xu
- College of Agriculture and Forestry Sciences, Linyi University, Linyi, 276000, China.
| | - Xiao-Yu Cui
- College of Agriculture and Forestry Sciences, Linyi University, Linyi, 276000, China.
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Xu M, Li H, Liu ZN, Wang XH, Xu P, Dai SJ, Cao X, Cui XY. The soybean CBL-interacting protein kinase, GmCIPK2, positively regulates drought tolerance and ABA signaling. Plant Physiol Biochem 2021; 167:980-989. [PMID: 34583133 DOI: 10.1016/j.plaphy.2021.09.026] [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: 07/08/2021] [Revised: 09/17/2021] [Accepted: 09/20/2021] [Indexed: 05/27/2023]
Abstract
Calcineurin B-like protein (CBL) and CBL-interacting protein kinase (CIPK) play important roles in plant environmental stress responses. However, the biological functions of the CBL-CIPK signaling pathway in the tolerance of soybean (Glycine max) to drought stress remain elusive. Here, we characterized the GmCIPK2 gene in soybean, and its expression was induced by drought stress and exogenous abscisic acid (ABA) treatments. The overexpression of GmCIPK2 enhanced drought tolerance in transgenic Arabidopsis and soybean hairy roots, whereas downregulation of GmCIPK2 expression in soybean hairy roots by RNA interference resulted in increased drought sensitivity. Further analysis showed that GmCIPK2 was involved in ABA-mediated stomatal closure in plants under drought stress conditions. GmCIPK2 increased the expression of ABA- and drought-responsive genes during drought stress. Additionally, yeast two-hybrid, pull-down, and bimolecular fluorescence complementation assays demonstrated that a positive regulator of drought stress, GmCBL1, physically interacted with GmCIPK2 on the plasma membrane. Collectively, our results demonstrated that GmCIPK2 positively regulates drought tolerance and ABA signaling in plants, providing new insights into the underlying mechanisms of how the CBL-CIPK signaling pathway contributes to drought tolerance in soybean.
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Affiliation(s)
- Meng Xu
- College of Agriculture and Forestry Sciences, Linyi University, Linyi, 276000, China.
| | - Hui Li
- College of Agriculture and Forestry Sciences, Linyi University, Linyi, 276000, China.
| | - Zhen-Ning Liu
- College of Agriculture and Forestry Sciences, Linyi University, Linyi, 276000, China.
| | - Xiao-Hua Wang
- College of Agriculture and Forestry Sciences, Linyi University, Linyi, 276000, China.
| | - Ping Xu
- College of Agriculture and Forestry Sciences, Linyi University, Linyi, 276000, China.
| | - Sheng-Jie Dai
- College of Agriculture and Forestry Sciences, Linyi University, Linyi, 276000, China.
| | - Xue Cao
- College of Agriculture and Forestry Sciences, Linyi University, Linyi, 276000, China.
| | - Xiao-Yu Cui
- College of Agriculture and Forestry Sciences, Linyi University, Linyi, 276000, China.
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8
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Wang X, Zuo QQ, Yu Q, Song CX, Wang ZH, Xiao N, Wang YJ, Weng XD, Wei X, Zhou HR, Cui XY. [Investigation on population dynamics and Echinococcus infections in small rodents around human settlement in Yushu City, Qinghai Province]. Zhongguo Xue Xi Chong Bing Fang Zhi Za Zhi 2021; 33:346-352. [PMID: 34505440 DOI: 10.16250/j.32.1374.2020002] [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: 11/27/2022]
Abstract
OBJECTIVE To investigate the population dynamics and Echinococcus infections in small rodents around human settlement in Yushu City, Qinghai Province. METHODS Rodents were captured using the mouse trap method in pastures from Batang Township and Longbao Township of Yushu City, Qinghai Province on May, August and October, 2018. The body weight and snout-vent length of all captured rodents were measured, and the species was identified according to the rodent morphology. Genomic DNA was extracted from rodent liver specimens and lesion specimens, and the mitochondrial cox1 gene of Echinococcus was amplified using PCR assay for identification of parasite species. In addition, the tissue specimens positive for PCR assay were sampled for pathological examinations. The prevalence of Echinococcus infections was estimated in rodents, and a phylogenetic tree was created based on Echinococcus cox1 gene sequences. RESULTS A total of 285 small rodents were captured, including 143 Ochotona curzoniae (50.2%), 141 Lasiopodomys fuscus (49.5%), and 1 Neodon irene (0.3%), and there was a remarkable variation in habitat selection among these three rodent species. The number of L. fuscus correlated positively with vegetation coverage (r = 0.350, P = 0.264), with the greatest number seen in August, and the number of O. curzoniae negatively with vegetation coverage (r = -0.371, P = 0.235), with the highest number seen in August and the lowest number in May. The female/male ratios of O. curzoniae and voles were 1:0.96 and 0.82:1, respectively. The body weight (r = 0.519, P < 0.01) and snout-vent length (r = 0.578, P < 0.01) of O. curzoniae showed a tendency towards a rise with month, while the body weight (r = -0.401, P < 0.01) and snout-vent length (r = -0.570, P < 0.01) of voles presented a tendency towards a reduction with month. No Echinococcus infection was detected in voles, while 2.1% prevalence of E. shiquicus infection was seen in O. curzoniae. Phylogenetic analysis revealed consistent sequences of cox1 gene from E. shiquicus in Yushu City of Qinghai Province and Shiqu County, Ganzi Tibetan Autonomous Prefecture of Sichuan Province. CONCLUSIONS The small rodents around the human settlement in Yushu City of Qinghai Province mainly include O. curzoniae and L. fuscus, with the greatest numbers seen in May and August, respectively. Following the concerted efforts for echinococcosis control, the prevalence of Echinococcus infections is low in small rodents around the human settlement in Yushu City; however, there is still a risk of echinococcosis transmission.
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Affiliation(s)
- X Wang
- National Institute of Parasitic Diseases, Chinese Center for Diseases Control and Prevention (Chinese Center for Tropical Diseases Research), NHC Key Laboratory of Parasite and Vector Biology, WHO Collaborating Centre for Tropical Diseases, National Center for International Research on Tropical Diseases, Shanghai 200025, China.,Co-first authors
| | - Q Q Zuo
- School of Life Sciences, East China Normal University, China.,Co-first authors
| | - Q Yu
- National Institute of Parasitic Diseases, Chinese Center for Diseases Control and Prevention (Chinese Center for Tropical Diseases Research), NHC Key Laboratory of Parasite and Vector Biology, WHO Collaborating Centre for Tropical Diseases, National Center for International Research on Tropical Diseases, Shanghai 200025, China
| | - C X Song
- Yushu Tibetan Autonomous Prefecture Center for Disease Control and Prevention, Qinghai Province, China
| | - Z H Wang
- School of Life Sciences, East China Normal University, China
| | - N Xiao
- National Institute of Parasitic Diseases, Chinese Center for Diseases Control and Prevention (Chinese Center for Tropical Diseases Research), NHC Key Laboratory of Parasite and Vector Biology, WHO Collaborating Centre for Tropical Diseases, National Center for International Research on Tropical Diseases, Shanghai 200025, China
| | - Y J Wang
- Yushu Municipal Center for Disease Control and Prevention, Qinghai Province, China
| | - X D Weng
- School of Life Sciences, East China Normal University, China
| | - X Wei
- School of Life Sciences, East China Normal University, China
| | - H R Zhou
- National Institute of Parasitic Diseases, Chinese Center for Diseases Control and Prevention (Chinese Center for Tropical Diseases Research), NHC Key Laboratory of Parasite and Vector Biology, WHO Collaborating Centre for Tropical Diseases, National Center for International Research on Tropical Diseases, Shanghai 200025, China
| | - X Y Cui
- National Institute of Parasitic Diseases, Chinese Center for Diseases Control and Prevention (Chinese Center for Tropical Diseases Research), NHC Key Laboratory of Parasite and Vector Biology, WHO Collaborating Centre for Tropical Diseases, National Center for International Research on Tropical Diseases, Shanghai 200025, China
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9
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Shan XX, Huang LL, Ding W, Li CY, Cui XY, Qian YJ, Guan YY. [SWOT analysis of schistosomiasis elimination in Laos]. Zhongguo Xue Xi Chong Bing Fang Zhi Za Zhi 2020; 32:414-418. [PMID: 32935520 DOI: 10.16250/j.32.1374.2020049] [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: 11/27/2022]
Abstract
OBJECTIVE To analyze the advantages, disadvantages, opportunities and challenges for schistosomiasis elimination in Laos, so as to propose the corresponding healthy policies and suggestions. METHODS A SWOT analysis was performed to analyze the strength, weakness, opportunity and threat for the schistosomiasis elimination program in Laos, and the corresponding policy suggestions were proposed. RESULTS The national schistosomiasis elimination program of Laos receives governmental emphases and great supports. A strategy based on mass drug administration was proposed and a sentinel site-bases surveillance system has been built for schistosomiasis elimination in Laos; however, there are several challenges for the national schistosomiasis elimination program in Laos, including insufficient financial supports, inadequate professional capability, weak schistosomiasis control awareness in community populations and difficulty in vector control. CONCLUSIONS Persistent governmental leadership, increasing financial supports, strengthening professional team building and improving schistosomiasis control awareness in community populations are required to facilitate the progress towards schistosomiasis elimination in Laos.
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Affiliation(s)
- X X Shan
- National Institute of Parasitic Diseases, Chinese Center for Disease Control and Prevention; WHO Collaborating Center for Tropical Diseases; Chinese Center for Tropical Diseases Research; National Center for International Research on Tropical Diseases, Ministry of Science and Technology, Shanghai 200025, China
| | - L L Huang
- National Institute of Parasitic Diseases, Chinese Center for Disease Control and Prevention; WHO Collaborating Center for Tropical Diseases; Chinese Center for Tropical Diseases Research; National Center for International Research on Tropical Diseases, Ministry of Science and Technology, Shanghai 200025, China
| | - W Ding
- National Institute of Parasitic Diseases, Chinese Center for Disease Control and Prevention; WHO Collaborating Center for Tropical Diseases; Chinese Center for Tropical Diseases Research; National Center for International Research on Tropical Diseases, Ministry of Science and Technology, Shanghai 200025, China
| | - C Y Li
- National Institute of Parasitic Diseases, Chinese Center for Disease Control and Prevention; WHO Collaborating Center for Tropical Diseases; Chinese Center for Tropical Diseases Research; National Center for International Research on Tropical Diseases, Ministry of Science and Technology, Shanghai 200025, China
| | - X Y Cui
- National Institute of Parasitic Diseases, Chinese Center for Disease Control and Prevention; WHO Collaborating Center for Tropical Diseases; Chinese Center for Tropical Diseases Research; National Center for International Research on Tropical Diseases, Ministry of Science and Technology, Shanghai 200025, China
| | - Y J Qian
- National Institute of Parasitic Diseases, Chinese Center for Disease Control and Prevention; WHO Collaborating Center for Tropical Diseases; Chinese Center for Tropical Diseases Research; National Center for International Research on Tropical Diseases, Ministry of Science and Technology, Shanghai 200025, China
| | - Y Y Guan
- National Institute of Parasitic Diseases, Chinese Center for Disease Control and Prevention; WHO Collaborating Center for Tropical Diseases; Chinese Center for Tropical Diseases Research; National Center for International Research on Tropical Diseases, Ministry of Science and Technology, Shanghai 200025, China
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10
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Fang Y, Lu MP, Wan WJ, Hong HY, Gao WX, Cui XY, Yu CJ, Bi MM, Zheng Y, Liao SM, Zhao JH, Shi JB, Wen WP, Cheng L. [Minutes of the 2019 China Rhinology Annual Meeting]. Zhonghua Er Bi Yan Hou Tou Jing Wai Ke Za Zhi 2019; 54:793-798. [PMID: 31606997 DOI: 10.3760/cma.j.issn.1673-0860.2019.10.018] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Affiliation(s)
- Y Fang
- Editorial Office of Chinese Journal of Otorhinolaryngology Head and Neck Surgery, Chinese Medical Association, Beijing 100710, China
| | - M P Lu
- Department of Otorhinolaryngology, the First Affiliated Hospital, Nanjing Medical University, Nanjing 210029, China
| | - W J Wan
- Department of Otorhinolaryngology, the First Affiliated Hospital, Nanjing Medical University, Nanjing 210029, China
| | - H Y Hong
- Department of Otorhinolaryngology, the Fifth Affiliated Hospital of Sun Yat-sen University, Zhuhai 519080, China
| | - W X Gao
- Otorhinolaryngology Hospital, the First Affiliated Hospital of Sun Yat-sen University, Guangzhou 510080, China
| | - X Y Cui
- Department of Otorhinolaryngology, the First Affiliated Hospital, Nanjing Medical University, Nanjing 210029, China
| | - C J Yu
- Department of Otorhinolaryngology, Nanjing Drum Tower Hospital, Nanjing University Medical School, Nanjing 210008, China
| | - M M Bi
- Department of Otorhinolaryngology, the Fifth Affiliated Hospital of Sun Yat-sen University, Zhuhai 519080, China
| | - Y Zheng
- Otorhinolaryngology Hospital, the First Affiliated Hospital of Sun Yat-sen University, Guangzhou 510080, China
| | - S M Liao
- Department of Otorhinolaryngology, the Fifth Affiliated Hospital of Sun Yat-sen University, Zhuhai 519080, China
| | - J H Zhao
- Department of Otorhinolaryngology, China-Japan Friendship Hospital, Beijing 100029, China
| | - J B Shi
- Otorhinolaryngology Hospital, the First Affiliated Hospital of Sun Yat-sen University, Guangzhou 510080, China
| | - W P Wen
- Otorhinolaryngology Hospital, the First Affiliated Hospital of Sun Yat-sen University, Guangzhou 510080, China
| | - L Cheng
- Department of Otorhinolaryngology, the First Affiliated Hospital, Nanjing Medical University, Nanjing 210029, China; International Centre for Allergy Research, Nanjing Medical University, and the Institute of Allergy and Autoimmune Disease, Jiangsu Clinical Medicine Research Institution, Nanjing 210029, China
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11
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Chen YF, Wei R, Yuan GQ, Gao DD, Jin Q, Cui XY, Zhang GX, Guo J. A new role of 11 C-Choline PET in localizing the epileptogenic foci in insular cortex in the patients. CNS Neurosci Ther 2019; 26:144-147. [PMID: 31508896 PMCID: PMC6930826 DOI: 10.1111/cns.13215] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/13/2019] [Revised: 08/08/2019] [Accepted: 08/14/2019] [Indexed: 11/30/2022] Open
Affiliation(s)
- Yu-Feng Chen
- Department of Nuclear Medicine, General Hospital of Northern Theater Command, Shenyang, China
| | - Ran Wei
- School of Sino-Dutch Biomedical and Information Engineering, Northeastern University, Shenyang, China
| | - Guan-Qian Yuan
- Department of Neurosurgery, General Hospital of Northern Theater Command, Shenyang, China
| | - Dan-Dan Gao
- Department of Neurosurgery, General Hospital of Northern Theater Command, Shenyang, China
| | - Qing Jin
- Department of Pathology, General Hospital of Northern Theater Command, Shenyang, China
| | - Xiao-Yu Cui
- School of Sino-Dutch Biomedical and Information Engineering, Northeastern University, Shenyang, China
| | - Guo-Xu Zhang
- Department of Nuclear Medicine, General Hospital of Northern Theater Command, Shenyang, China
| | - Jia Guo
- Department of Nuclear Medicine, General Hospital of Northern Theater Command, Shenyang, China
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12
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Cui XY, Gao Y, Guo J, Yu TF, Zheng WJ, Liu YW, Chen J, Xu ZS, Ma YZ. BES/BZR Transcription Factor TaBZR2 Positively Regulates Drought Responses by Activation of TaGST1. Plant Physiol 2019; 180:605-620. [PMID: 30842265 PMCID: PMC6501075 DOI: 10.1104/pp.19.00100] [Citation(s) in RCA: 94] [Impact Index Per Article: 18.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/28/2019] [Accepted: 02/22/2019] [Indexed: 05/18/2023]
Affiliation(s)
- Xiao-Yu Cui
- Institute of Crop Science, Chinese Academy of Agricultural Sciences/National Key Facility for Crop Gene Resources and Genetic Improvement, Key Laboratory of Biology and Genetic Improvement of Triticeae Crops, Ministry of Agriculture, Beijing 100081, China
- Tobacco Research Institute, Chinese Academy of Agricultural Sciences, Qingdao 266101, China
| | - Yuan Gao
- Institute of Crop Science, Chinese Academy of Agricultural Sciences/National Key Facility for Crop Gene Resources and Genetic Improvement, Key Laboratory of Biology and Genetic Improvement of Triticeae Crops, Ministry of Agriculture, Beijing 100081, China
| | - Jun Guo
- College of Plant Protection/College of Agronomy, Northwest A&F University, Yangling, Shaanxi 712100, China
| | - Tai-Fei Yu
- Institute of Crop Science, Chinese Academy of Agricultural Sciences/National Key Facility for Crop Gene Resources and Genetic Improvement, Key Laboratory of Biology and Genetic Improvement of Triticeae Crops, Ministry of Agriculture, Beijing 100081, China
| | - Wei-Jun Zheng
- College of Plant Protection/College of Agronomy, Northwest A&F University, Yangling, Shaanxi 712100, China
| | - Yong-Wei Liu
- Institute of Genetics and Physiology, Hebei Academy of Agriculture and Forestry Sciences/Plant Genetic Engineering Center of Hebei Province, Shijiazhuang, Hebei 050051, China
| | - Jun Chen
- Institute of Crop Science, Chinese Academy of Agricultural Sciences/National Key Facility for Crop Gene Resources and Genetic Improvement, Key Laboratory of Biology and Genetic Improvement of Triticeae Crops, Ministry of Agriculture, Beijing 100081, China
| | - Zhao-Shi Xu
- Institute of Crop Science, Chinese Academy of Agricultural Sciences/National Key Facility for Crop Gene Resources and Genetic Improvement, Key Laboratory of Biology and Genetic Improvement of Triticeae Crops, Ministry of Agriculture, Beijing 100081, China
| | - You-Zhi Ma
- Institute of Crop Science, Chinese Academy of Agricultural Sciences/National Key Facility for Crop Gene Resources and Genetic Improvement, Key Laboratory of Biology and Genetic Improvement of Triticeae Crops, Ministry of Agriculture, Beijing 100081, China
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Qiu CY, Cui XY, Cheng L. [Mechanism of innate immunity and adaptive immunity in the development of allergic rhinitis]. Lin Chung Er Bi Yan Hou Tou Jing Wai Ke Za Zhi 2019; 33:28-35. [PMID: 30669195 DOI: 10.13201/j.issn.1001-1781.2019.01.007] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Received: 12/13/2018] [Indexed: 11/12/2022]
Abstract
The pathogenesis of allergic rhinitis (AR) has not well been clarified, and the imbalance of immune system is its important feature. Interaction between innate and adaptive immune cells and inflammatory mediators secreted by them triggers, maintains and aggravates AR. In this review, Toll-like receptor signaling pathways are used as a bridge to systematically analyze the mechanisms of innate and adaptive immunity in the development of AR.
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Weston L, Downes JE, Baldwin CG, Granados E, Tawfik SA, Cui XY, Stampfl C, Mildren RP. Photochemical Etching of Carbonyl Groups from a Carbon Matrix: The (001) Diamond Surface. Phys Rev Lett 2019; 122:016802. [PMID: 31012670 DOI: 10.1103/physrevlett.122.016802] [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: 03/23/2018] [Revised: 10/19/2018] [Indexed: 06/09/2023]
Abstract
The surface of diamond is reported to undergo nonablative photochemical etching when exposed to ultraviolet (UV) radiation which allows controlled single and partial layer removal of lattice layers. Oxygen termination of surface dangling bonds is known to be crucial for the etching process; however, the exact mechanism of carbon ejection remains unclear. We investigate the interaction of UV laser pulses with oxygen-terminated diamond surfaces using atomic-scale surface characterization combined with first-principles time-dependent density functional theory calculations. We present evidence for laser-induced desorption (LID) from carbonyl functional groups at the diamond {001} surface. The doubly bonded carbonyl group is photoexcited into a triply bonded CO-like state, including scission of the underlying C─C bonds. The carbon removal process in LID is atom by atom; therefore, this mechanism provides a novel "top-down" approach for creating nanostructures on the surface of diamond and other carbon-containing semiconductors.
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Affiliation(s)
- L Weston
- MQ Photonics Research Centre, Department of Physics and Astronomy, Macquarie University, New South Wales 2109, Australia
- School of Physics, The University of Sydney, Sydney, New South Wales 2006, Australia
| | - J E Downes
- MQ Photonics Research Centre, Department of Physics and Astronomy, Macquarie University, New South Wales 2109, Australia
| | - C G Baldwin
- MQ Photonics Research Centre, Department of Physics and Astronomy, Macquarie University, New South Wales 2109, Australia
| | - E Granados
- MQ Photonics Research Centre, Department of Physics and Astronomy, Macquarie University, New South Wales 2109, Australia
| | | | - X Y Cui
- Australian Centre for Microscopy and Microanalysis, School of Aerospace, Mechanical and Mechatronic Engineering, The University of Sydney, New South Wales 2006, Australia
| | - C Stampfl
- School of Physics, The University of Sydney, Sydney, New South Wales 2006, Australia
| | - R P Mildren
- MQ Photonics Research Centre, Department of Physics and Astronomy, Macquarie University, New South Wales 2109, Australia
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15
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Cui XY, Du YT, Fu JD, Yu TF, Wang CT, Chen M, Chen J, Ma YZ, Xu ZS. Wheat CBL-interacting protein kinase 23 positively regulates drought stress and ABA responses. BMC Plant Biol 2018; 18:93. [PMID: 29801463 PMCID: PMC5970481 DOI: 10.1186/s12870-018-1306-5] [Citation(s) in RCA: 34] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/26/2017] [Accepted: 05/08/2018] [Indexed: 05/22/2023]
Abstract
BACKGROUND The calcineurin B-like protein (CBL)-interacting protein kinase (CIPK) signaling pathway responds to various abiotic stresses in plants. RESULTS Wheat CIPK23, isolated from wheat drought transcriptome data set, was induced by multiple abiotic stresses, including drought, salt, and abscisic acid (ABA). Compared with wild-type plants, TaCIPK23-overexpression wheat and Arabidopsis showed an higher survival rate under drought conditions with enhanced germination rate, developed root system, increased accumulation of osmolytes, and reduced water loss rate. Over-expression of TaCIPK23 rendered transgenic plants ABA sensitivity, as evidenced by delayed seed germination and the induction of stomatal closure. Consistent with the ABA-sensitive phenotype, the expression level of drought- and ABA-responsive genes were increased under drought conditions in the transgenic plants. In addition, using yeast two-hybrid system, pull-down and bimolecular fluorescence complementation (BiFc) assays, TaCIPK23 was found to interact with TaCBL1 on the plasma membrane. CONCLUSIONS These results suggest that TaCIPK23 plays important roles in ABA and drought stress responses, and mediates crosstalk between the ABA signaling pathway and drought stress responses in wheat.
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Affiliation(s)
- Xiao-Yu Cui
- Institute of Crop Science, Chinese Academy of Agricultural Sciences (CAAS)/National Key Facility for Crop Gene Resources and Genetic Improvement, Key Laboratory of Biology and Genetic Improvement of Triticeae Crops, Ministry of Agriculture, Beijing, 100081 China
| | - Yong-Tao Du
- Institute of Crop Science, Chinese Academy of Agricultural Sciences (CAAS)/National Key Facility for Crop Gene Resources and Genetic Improvement, Key Laboratory of Biology and Genetic Improvement of Triticeae Crops, Ministry of Agriculture, Beijing, 100081 China
| | - Jin-dong Fu
- Institute of Crop Science, Chinese Academy of Agricultural Sciences (CAAS)/National Key Facility for Crop Gene Resources and Genetic Improvement, Key Laboratory of Biology and Genetic Improvement of Triticeae Crops, Ministry of Agriculture, Beijing, 100081 China
| | - Tai-Fei Yu
- Institute of Crop Science, Chinese Academy of Agricultural Sciences (CAAS)/National Key Facility for Crop Gene Resources and Genetic Improvement, Key Laboratory of Biology and Genetic Improvement of Triticeae Crops, Ministry of Agriculture, Beijing, 100081 China
| | - Chang-Tao Wang
- Beijing Advanced Innovation Center for Food Nutrition and Human Health/Beijing Key Lab of Plant Resource Research and Development, Beijing Technology and Business University, Beijing, 100048 China
| | - Ming Chen
- Institute of Crop Science, Chinese Academy of Agricultural Sciences (CAAS)/National Key Facility for Crop Gene Resources and Genetic Improvement, Key Laboratory of Biology and Genetic Improvement of Triticeae Crops, Ministry of Agriculture, Beijing, 100081 China
| | - Jun Chen
- Institute of Crop Science, Chinese Academy of Agricultural Sciences (CAAS)/National Key Facility for Crop Gene Resources and Genetic Improvement, Key Laboratory of Biology and Genetic Improvement of Triticeae Crops, Ministry of Agriculture, Beijing, 100081 China
| | - You-Zhi Ma
- Institute of Crop Science, Chinese Academy of Agricultural Sciences (CAAS)/National Key Facility for Crop Gene Resources and Genetic Improvement, Key Laboratory of Biology and Genetic Improvement of Triticeae Crops, Ministry of Agriculture, Beijing, 100081 China
| | - Zhao-Shi Xu
- Institute of Crop Science, Chinese Academy of Agricultural Sciences (CAAS)/National Key Facility for Crop Gene Resources and Genetic Improvement, Key Laboratory of Biology and Genetic Improvement of Triticeae Crops, Ministry of Agriculture, Beijing, 100081 China
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Cui XY, Du YT, Fu JD, Yu TF, Wang CT, Chen M, Chen J, Ma YZ, Xu ZS. Wheat CBL-interacting protein kinase 23 positively regulates drought stress and ABA responses. BMC Plant Biol 2018. [PMID: 29801463 DOI: 10.1186/s12870-018-1306-5research] [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] [Key Words] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/05/2023]
Abstract
BACKGROUND The calcineurin B-like protein (CBL)-interacting protein kinase (CIPK) signaling pathway responds to various abiotic stresses in plants. RESULTS Wheat CIPK23, isolated from wheat drought transcriptome data set, was induced by multiple abiotic stresses, including drought, salt, and abscisic acid (ABA). Compared with wild-type plants, TaCIPK23-overexpression wheat and Arabidopsis showed an higher survival rate under drought conditions with enhanced germination rate, developed root system, increased accumulation of osmolytes, and reduced water loss rate. Over-expression of TaCIPK23 rendered transgenic plants ABA sensitivity, as evidenced by delayed seed germination and the induction of stomatal closure. Consistent with the ABA-sensitive phenotype, the expression level of drought- and ABA-responsive genes were increased under drought conditions in the transgenic plants. In addition, using yeast two-hybrid system, pull-down and bimolecular fluorescence complementation (BiFc) assays, TaCIPK23 was found to interact with TaCBL1 on the plasma membrane. CONCLUSIONS These results suggest that TaCIPK23 plays important roles in ABA and drought stress responses, and mediates crosstalk between the ABA signaling pathway and drought stress responses in wheat.
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Affiliation(s)
- Xiao-Yu Cui
- Institute of Crop Science, Chinese Academy of Agricultural Sciences (CAAS)/National Key Facility for Crop Gene Resources and Genetic Improvement, Key Laboratory of Biology and Genetic Improvement of Triticeae Crops, Ministry of Agriculture, Beijing, 100081, China
| | - Yong-Tao Du
- Institute of Crop Science, Chinese Academy of Agricultural Sciences (CAAS)/National Key Facility for Crop Gene Resources and Genetic Improvement, Key Laboratory of Biology and Genetic Improvement of Triticeae Crops, Ministry of Agriculture, Beijing, 100081, China
| | - Jin-Dong Fu
- Institute of Crop Science, Chinese Academy of Agricultural Sciences (CAAS)/National Key Facility for Crop Gene Resources and Genetic Improvement, Key Laboratory of Biology and Genetic Improvement of Triticeae Crops, Ministry of Agriculture, Beijing, 100081, China
| | - Tai-Fei Yu
- Institute of Crop Science, Chinese Academy of Agricultural Sciences (CAAS)/National Key Facility for Crop Gene Resources and Genetic Improvement, Key Laboratory of Biology and Genetic Improvement of Triticeae Crops, Ministry of Agriculture, Beijing, 100081, China
| | - Chang-Tao Wang
- Beijing Advanced Innovation Center for Food Nutrition and Human Health/Beijing Key Lab of Plant Resource Research and Development, Beijing Technology and Business University, Beijing, 100048, China
| | - Ming Chen
- Institute of Crop Science, Chinese Academy of Agricultural Sciences (CAAS)/National Key Facility for Crop Gene Resources and Genetic Improvement, Key Laboratory of Biology and Genetic Improvement of Triticeae Crops, Ministry of Agriculture, Beijing, 100081, China
| | - Jun Chen
- Institute of Crop Science, Chinese Academy of Agricultural Sciences (CAAS)/National Key Facility for Crop Gene Resources and Genetic Improvement, Key Laboratory of Biology and Genetic Improvement of Triticeae Crops, Ministry of Agriculture, Beijing, 100081, China
| | - You-Zhi Ma
- Institute of Crop Science, Chinese Academy of Agricultural Sciences (CAAS)/National Key Facility for Crop Gene Resources and Genetic Improvement, Key Laboratory of Biology and Genetic Improvement of Triticeae Crops, Ministry of Agriculture, Beijing, 100081, China.
| | - Zhao-Shi Xu
- Institute of Crop Science, Chinese Academy of Agricultural Sciences (CAAS)/National Key Facility for Crop Gene Resources and Genetic Improvement, Key Laboratory of Biology and Genetic Improvement of Triticeae Crops, Ministry of Agriculture, Beijing, 100081, China.
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Cui XY, Tong D, Wang XZ, Shen ZJ. [Comparison of the translucency and color masking effect of the zirconia ceramics made by milling and gel deposition]. Beijing Da Xue Xue Bao Yi Xue Ban 2018; 50:85-90. [PMID: 29483728] [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: 06/08/2023]
Abstract
OBJECTIVE Three kinds of zirconia specimens were made respectively by milling of the prisintered blocks and by three dimensional (3D) gel deposition for in vitro evaluation of their optical translucency under three different thicknesses and their color masking effect on discolored teeth. The study aims for establishing the principle for guiding the materials selection in clinical practice. METHODS Ninety A2-colored zirconia disc specimens with diameter of 14 mm were prepared and were divided into three groups (n=30). (1) Group CZ, by milling of the presintered blanks; (2) Group NZW, by 3D gel deposition, without a color masking opaque inner layer; (3) Group NZY, by 3D gel deposition, with a color masking opaque inner layer. Furthermore, each group was divided into three sub-groups (n=10) according to the sample thickness, i.e., 0.6, 1.0 and 1.5 mm, respectively. The maxillary anterior teeth with severe discoloration, extracted owing to periodontal disease, were collected and embedded. By gentle gridding and polishing a plane, larger than 6 mm2×6 mm2, was generated on the labial surface of each tooth. Chromatic values(CIE1976-L*a*b*) of the zirconia samples in the nine sub-groups were measured by the spectrophotometer Crystaleye in front of the black or white background in a cassette, and the translucency parameter (TP) values were calculated for each sample. Thereafter the zirconia specimens were bonded onto the labial surface of the polished teeth for measuring the chromatic values, using the chromatic value of the medium 1/3 of the standardized Vita A2 as a control. The color aberration ΔE between each zirconia specimen and the control value was calculated, respectively. The results were statistically analyzed by One-way ANOVA and Bonferroni. RESULTS (1) The optical transparency of the three kinds of zirconia disc specimens with the thickness of 0.6, 1.0 and 1.5 mm was 14.09, 12.31 and 10.45 for group CZ; 19.84, 16.54 and 12.44 for group NZW;14.81, 13.16 and 11.92 for group NZY. In each group, the degree of optical transparency of the specimens showed a clear tendency as in the sub-group 0.6 mm >1.0 mm >1.5 mm. The TP value of the specimens in the three groups with the same thickness showed a tendency of the group NZW >group NZY >group CZ. (2) After bonding onto the polished labial surface of the teeth, the color aberration ΔE of the specimens with the thickness of 0.6, 1.0 and 1.5 mm was calculated to be 10.77, 9.94 and 8.50 for group CZ; 6.84, 5.89 and 5.29 for group NZW; 4.16, 3.92 and 3.67 for group NZY. In each group, the color aberration of the specimens showed a clear tendency as in the sub-group 0.6 mm >1.0 mm >1.5 mm; the color aberration of the three groups with the same thickness was in the order of the group CZ >group NZW >group NZY. CONCLUSION In all the specimen groups with a fixed specimen thickness, the optical translucency of the specimen was the highest in group NZW made by 3D gel deposition, and the best color masking effect was obtained in specimens with a color masking opaque inner layer in group NZY, where a thickness of 0.6 mm was sufficient enough for obtaining the ideal color masking effect.
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Affiliation(s)
- X Y Cui
- Department of Prosthodontics, Peking University School and Hospital of Stomatology & National Engineering Laboratory for Digital and Material Technology of Stomatology & Beijing Key Laboratory of Digital Stomatology, Beijing 100081, China
| | - D Tong
- Department of Prosthodontics, Peking University School and Hospital of Stomatology & National Engineering Laboratory for Digital and Material Technology of Stomatology & Beijing Key Laboratory of Digital Stomatology, Beijing 100081, China; Dental Laboratory, Peking University School and Hospital of Stomatology & National Engineering Laboratory for Digital and Material Technology of Stomatology & Beijing Key Laboratory of Digital Stomatology, Beijing 100081, China
| | - X Z Wang
- Department of Prosthodontics, Peking University School and Hospital of Stomatology & National Engineering Laboratory for Digital and Material Technology of Stomatology & Beijing Key Laboratory of Digital Stomatology, Beijing 100081, China
| | - Z J Shen
- Department of Materials and Environmental Chemistry, Arrhenius Laboratory, Stockholm University, S-106 91 Stockholm, Sweden
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Cui XY, Chen F, Qian XY, Wang HD, Hou J, Li A, Gao X, Yu CJ. [Application of the microdissection needle for endoscopic prelacrimal recess approach]. Lin Chung Er Bi Yan Hou Tou Jing Wai Ke Za Zhi 2017; 31:1844-1847. [PMID: 29798400 DOI: 10.13201/j.issn.1001-1781.2017.23.015] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Key Words] [Subscribe] [Scholar Register] [Received: 05/31/2017] [Indexed: 11/12/2022]
Affiliation(s)
- X Y Cui
- Department of Otorhinolaryngology, First Affiliated Hospital of Nanjing Medical University, 210029, China
| | - F Chen
- Department of Otorhinolaryngology Head and Neck Surgery, Nanjing Drum Tower Hospital , the affiliated Hospital of Nanjing University Medicine School
| | - X Y Qian
- Department of Otorhinolaryngology Head and Neck Surgery, Nanjing Drum Tower Hospital , the affiliated Hospital of Nanjing University Medicine School
| | - H D Wang
- Department of Otorhinolaryngology Head and Neck Surgery, Nanjing Drum Tower Hospital , the affiliated Hospital of Nanjing University Medicine School
| | - J Hou
- Department of Otorhinolaryngology Head and Neck Surgery, Nanjing Drum Tower Hospital , the affiliated Hospital of Nanjing University Medicine School
| | - A Li
- Department of Otorhinolaryngology Head and Neck Surgery, Nanjing Drum Tower Hospital , the affiliated Hospital of Nanjing University Medicine School
| | - X Gao
- Department of Otorhinolaryngology Head and Neck Surgery, Nanjing Drum Tower Hospital , the affiliated Hospital of Nanjing University Medicine School
| | - C J Yu
- Department of Otorhinolaryngology Head and Neck Surgery, Nanjing Drum Tower Hospital , the affiliated Hospital of Nanjing University Medicine School
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Abstract
The potential of C60 as a nucleic acid base (NAB) optical sensor is theoretically explored. We investigate the adsorption of four NABs, namely, adenine, cytosine, guanine, and thymine, on C60 in the gas phase. For the optimal NAB@C60 adsorption configurations, obtained using a dispersion-corrected density functional, we calculate the vis-near-ultraviolet optical response using time-dependent density functional theory. While the isolated C60 and NAB molecules do not exhibit visible optical excitation, we find that C60/NAB conjugation gives rise to distinct spectral features in the visible range. These results suggest that C60 conjugation can be applied for photodetection of individual NABs.
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Affiliation(s)
| | | | | | - C Stampfl
- School of Physics, The University of Sydney , Sydney, New South Wales 2006, Australia
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Quan YR, Chen Z, Qiu P, Cui XY, Li CG, Yuan LY. Sequence Analysis and Comparison of the Key Genes of Domestic Live Attenuated Varicella Vaccine. Zhongguo Yi Xue Ke Xue Yuan Xue Bao 2017; 39:637-642. [PMID: 29125105 DOI: 10.3881/j.issn.1000-503x.2017.05.007] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
Objective To analyze the safety and consistency of domestic live attenuated varicella vaccines (LAVVs) at gene level.Methods The key genes (ORF38,ORF54,and ORF62) of LAVVs produced by four Chinese manufacturers were amplified by polymerase chain reaction (PCR) and sequenced.The sequencing results were compared with the sequences of Dumas,P-Oka,and V-Oka strains in GenBank and with the sequences of Varilrix (GSK) and Varivax (Merck).Results The ORF38 and ORF54 gene sequences of four domestic LAVVs were the same as each other and completely consistent with the sequences of V-Oka and Varilrix;however,it was different from Varivax (Merck) at one site.The ORF62 gene sequences of four domestic LAVVs were similar,and had individual nucleotide differences with V-Oka,Varilrix(GSK),and Varivax (Merck).Conclusions The sequences of ORF38,ORF54,and ORF62 of four domestic LAVVs are almost the same,showing good stability.They have small differences with V-Oka,Varilrix(GSK),and Varivax (Merck),without introducing new mutations.
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Affiliation(s)
- Ya-Ru Quan
- Division of Respiratory Virus Vaccines,Institute for Biological Product Control,National Institutes for Food and Drug Control,Beijing 100050,China
| | - Zhen Chen
- Division of Respiratory Virus Vaccines,Institute for Biological Product Control,National Institutes for Food and Drug Control,Beijing 100050,China
| | - Ping Qiu
- Division of Respiratory Virus Vaccines,Institute for Biological Product Control,National Institutes for Food and Drug Control,Beijing 100050,China
| | - Xiao-Yu Cui
- Division of Respiratory Virus Vaccines,Institute for Biological Product Control,National Institutes for Food and Drug Control,Beijing 100050,China
| | - Chang-Gui Li
- Division of Respiratory Virus Vaccines,Institute for Biological Product Control,National Institutes for Food and Drug Control,Beijing 100050,China
| | - Li-Yong Yuan
- Division of Respiratory Virus Vaccines,Institute for Biological Product Control,National Institutes for Food and Drug Control,Beijing 100050,China
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Liu JX, Wang JW, Cui XY. [The significance of peripheral blood natural killer cell surface CD 107a, NKG2D and serum sMICA in patients with extranodal NK/T cell lymphoma, nasal type]. Zhonghua Nei Ke Za Zhi 2017; 55:872-874. [PMID: 27801344 DOI: 10.3760/cma.j.issn.0578-1426.2016.11.012] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
The expression of CD107a, NKG2D on the surface of natural killer (NK) cells and serum soluble major histocompatibility complex class Ⅰ chain-related A (sMICA) level in patients with extranodal NK/T cell lymphoma, nasal type (ENKL) were detected.We found that CD107a expression was reduced on the surface of NK cells, suggesting impaired NK cell activity in ENKL patients, which may result from decreased NKG2D expression.
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Affiliation(s)
- J X Liu
- Department of Hematology, Beijing Tongren Hospital, Capital Medical University, Beijing 100730, China
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Tawfik SA, Weston L, Cui XY, Ringer SP, Stampfl C. Near-Perfect Spin Filtering and Negative Differential Resistance in an Fe(II)S Complex. J Phys Chem Lett 2017; 8:2189-2194. [PMID: 28457138 DOI: 10.1021/acs.jpclett.7b00551] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Density functional theory and nonequilibrium Green's function calculations have been used to explore spin-resolved transport through the high-spin state of an iron(II)sulfur single molecular magnet. Our results show that this molecule exhibits near-perfect spin filtering, where the spin-filtering efficiency is above 99%, as well as significant negative differential resistance centered at a low bias voltage. The rise in the spin-up conductivity up to the bias voltage of 0.4 V is dominated by a conductive lowest unoccupied molecular orbital, and this is accompanied by a slight increase in the magnetic moment of the Fe atom. The subsequent drop in the spin-up conductivity is because the conductive channel moves to the highest occupied molecular orbital, which has a lower conductance contribution. This is accompanied by a drop in the magnetic moment of the Fe atom. These two exceptional properties, and the fact that the onset of negative differential resistance occurs at low bias voltage, suggests the potential of the molecule in nanoelectronic and nanospintronic applications.
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Affiliation(s)
| | - Leigh Weston
- Materials Department, University of California , Santa Barbara, California, United States
| | - X Y Cui
- Australian Centre for Microscopy and Microanalysis, and School of Aerospace, Mechanical and Mechatronic Engineering, The University of Sydney , New South Wales, 2006, Australia
| | - S P Ringer
- Australian Centre for Microscopy and Microanalysis, and School of Aerospace, Mechanical and Mechatronic Engineering, The University of Sydney , New South Wales, 2006, Australia
| | - C Stampfl
- School of Physics, The University of Sydney , New South Wales, 2006, Australia
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Saadaoui H, Luo X, Salman Z, Cui XY, Bao NN, Bao P, Zheng RK, Tseng LT, Du YH, Prokscha T, Suter A, Liu T, Wang YR, Li S, Ding J, Ringer SP, Morenzoni E, Yi JB. Intrinsic Ferromagnetism in the Diluted Magnetic Semiconductor Co:TiO_{2}. Phys Rev Lett 2016; 117:227202. [PMID: 27925730 DOI: 10.1103/physrevlett.117.227202] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/16/2016] [Indexed: 06/06/2023]
Abstract
Here we present a study of magnetism in Co_{0.05}Ti_{0.95}O_{2-δ} anatase films grown by pulsed laser deposition under a variety of oxygen partial pressures and deposition rates. Energy-dispersive spectrometry and transmission electron microscopy analyses indicate that a high deposition rate leads to a homogeneous microstructure, while a very low rate or postannealing results in cobalt clustering. Depth resolved low-energy muon spin rotation experiments show that films grown at a low oxygen partial pressure (≈10^{-6} torr) with a uniform structure are fully magnetic, indicating intrinsic ferromagnetism. First principles calculations identify the beneficial role of low oxygen partial pressure in the realization of uniform carrier-mediated ferromagnetism. This work demonstrates that Co:TiO_{2} is an intrinsic diluted magnetic semiconductor.
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Affiliation(s)
- H Saadaoui
- Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute, 5232 Villigen PSI, Switzerland
| | - X Luo
- School of Materials Science and Engineering, UNSW, Sydney, New South Wales 2052, Australia
| | - Z Salman
- Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute, 5232 Villigen PSI, Switzerland
| | - X Y Cui
- School of Aerospace, Mechanical and Mechatronic Engineering, The University of Sydney, Sydney, New South Wales 2006, Australia
| | - N N Bao
- Department of Materials Science and Engineering, National University of Singapore, 119260, Singapore
| | - P Bao
- School of Physics, The University of Sydney, Sydney, New South Wales 2006, Australia
| | - R K Zheng
- School of Physics, The University of Sydney, Sydney, New South Wales 2006, Australia
| | - L T Tseng
- School of Materials Science and Engineering, UNSW, Sydney, New South Wales 2052, Australia
| | - Y H Du
- Institute of Chemical and Engineering Science, Agency for Science, Technology and Research (A*STAR), 1 Pesek Road, Jurong Island, 627833, Singapore
| | - T Prokscha
- Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute, 5232 Villigen PSI, Switzerland
| | - A Suter
- Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute, 5232 Villigen PSI, Switzerland
| | - T Liu
- ANKA, Karlsruhe Institute of Technology, 76344 Eggenstein-Leopoldshafen, Germany
| | - Y R Wang
- School of Materials Science and Engineering, UNSW, Sydney, New South Wales 2052, Australia
| | - S Li
- School of Materials Science and Engineering, UNSW, Sydney, New South Wales 2052, Australia
| | - J Ding
- Department of Materials Science and Engineering, National University of Singapore, 119260, Singapore
| | - S P Ringer
- School of Aerospace, Mechanical and Mechatronic Engineering, The University of Sydney, Sydney, New South Wales 2006, Australia
- The Australian Institute for Nanoscale Science and Technology, The University of Sydney, Sydney, New South Wales 2006, Australia
| | - E Morenzoni
- Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute, 5232 Villigen PSI, Switzerland
| | - J B Yi
- School of Materials Science and Engineering, UNSW, Sydney, New South Wales 2052, Australia
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Shang J, Fang N, Cui XY, Wang X. [One case of laryngotracheal fungal disease]. Lin Chung Er Bi Yan Hou Tou Jing Wai Ke Za Zhi 2016; 30:1810-1811. [PMID: 29798491 DOI: 10.13201/j.issn.1001-1781.2016.22.018] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Received: 04/18/2016] [Indexed: 11/12/2022]
Abstract
Clinical manifestations: a female patient's hoarseness for more than 10 days. Video Laryngoscope: White toothpaste-like albuginea is visilable on the bilateral vocal cords and trachea about 2-3 ring. Pathology: Fungal bacterial mass.clinical diagnosis:Laryngeal fungal disease.
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Cui XY, Duan HX, Zhang Y, Wang YQ. Asymmetric Mannich Reaction of Aryl Methyl Ketones with Cyclic Imines Benzo[e
][1,2,3]oxathiazine 2,2-Dioxides Catalyzed by Cinchona Alkaloid-based Primary Amines. Chem Asian J 2016; 11:3118-3125. [DOI: 10.1002/asia.201601149] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/16/2016] [Indexed: 11/08/2022]
Affiliation(s)
- Xiao-Yu Cui
- Key Laboratory of Polyoxometalate Chemistry of Henan Province; Key Laboratory of Natural Medicine and Immuno-Engineering of Henan Province; College of Chemistry and Chemical Engineering; Henan University; Kaifeng Henan 475004 P. R. China
| | - Hui-Xin Duan
- Key Laboratory of Polyoxometalate Chemistry of Henan Province; Key Laboratory of Natural Medicine and Immuno-Engineering of Henan Province; College of Chemistry and Chemical Engineering; Henan University; Kaifeng Henan 475004 P. R. China
| | - Yongna Zhang
- Key Laboratory of Polyoxometalate Chemistry of Henan Province; Key Laboratory of Natural Medicine and Immuno-Engineering of Henan Province; College of Chemistry and Chemical Engineering; Henan University; Kaifeng Henan 475004 P. R. China
| | - You-Qing Wang
- Key Laboratory of Polyoxometalate Chemistry of Henan Province; Key Laboratory of Natural Medicine and Immuno-Engineering of Henan Province; College of Chemistry and Chemical Engineering; Henan University; Kaifeng Henan 475004 P. R. China
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Cui XY, Zhang H, Luo J, Zhang RB. [Simulation of Multimedia Transfer and Fate of Perfluorooctane Sulfonate (PFOS) in Shenzhen Region]. Huan Jing Ke Xue 2016; 37:3001-3006. [PMID: 29964725 DOI: 10.13277/j.hjkx.2016.08.022] [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: 11/27/2022]
Abstract
To study the transfer and fate of perfluorooctane sulfonate (PFOS) in Shenzhen region, a level Ⅲ fugacity model was used to simulate and calculate the concentrations of PFOS in local air, water, soil and sediment. Physical and chemical parameters of PFOS and environmental parameters of Shenzhen were entered into the model. The simulated concentrations were compared with actual measurements to validate the model, and then analyzed based on the transfer flux of PFOS between media to identify the main transfer route. The input parameters and output results of the model underwent sensitivity analysis and uncertainty analysis, respectively. The simulated concentrations of PFOS in air, water, soil and sediment were 1.4 pg·m-3, 7.0 ng·L-1, 0.39 μg·kg-1 and 0.11 μg·kg-1, in good agreement with the actual measurements. The transfer from air to soil, soil to water and air to water were the main PFOS transfer routes between media, accounting for 32%, 32%, 5.8% of total transfer, respectively. The transfer through water was the major PFOS outlet from a region. The advective input of air and water, temperature, PFOS solubility, precipitation and density of soil and sediment were the key parameters affecting the model output. Uncertainty analysis showed that the coefficient of variation of PFOS concentrations reached the minimum in water and the maximum in soil, which may be caused by the highly changeable content of organic carbon in soil.
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Affiliation(s)
- Xiao-Yu Cui
- College of Life Sciences, Shenzhen University, Shenzhen 518060, China
| | - Hong Zhang
- College of Physics Science and Technology, Shenzhen University, Shenzhen 518060, China
| | - Ji Luo
- College of Physics Science and Technology, Dalian University, Dalian 116622, China
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Abstract
Through first-principles calculations using the nonequilibrium Green's function formalism together with density functional theory, we study the conductance of double-vacancy zigzag graphene nanoribbons doped with four transition metal atoms Ti, V, Cr and Fe. We show that Ti doping induces large spin-filtering with an efficiency in excess of 90% for bias voltages below 0.5 V, while the other metal adatoms do not induce large spin filtering. This is despite the fact that the Ti dopant possesses small spin moment, while large moments reside on V, Cr and Fe dopants. Our analysis shows that the suppression of transmission in the spin-down channel in the Ti-doped graphene nanoribbon, thus the large spin filtering efficiency, is due to transmission anti-resonance arising from destructive quantum interference. These findings suggest that the decoration of graphene with titanium, and possibly other transition metals, can act as effective spin filters for nanospintronic applications.
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Tawfik SA, Cui XY, Ringer SP, Stampfl C. Enhanced oscillatory rectification and negative differential resistance in pentamantane diamondoid-cumulene systems. Nanoscale 2016; 8:3461-3466. [PMID: 26794415 DOI: 10.1039/c5nr07467c] [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] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
We propose a new functionality for diamondoids in nanoelectronics. Based on the nonequilibrium Green's function formalism and density functional theory, we reveal that when attached to gold electrodes, the pentamantane-cumulene molecular junction exhibits large and oscillatory rectification and negative differential resistance (NDR) - depending on the number of carbon atoms in cumulene (Cn). When n is odd rectification is greatly enhanced where the rectification ratio can reach ∼180 and a large negative differential resistance peak current of ∼3 μA. This oscillatory behavior is well rationalised in terms of the occupancy of the carbon 2p states in Cn. Interestingly, different layers of C atoms in the pentamantane molecule have different contributions to transmission. The first and third layers of C atoms in pentamantane have a slight contribution to rectification, and the fifth and sixth layers have a stronger contribution to both rectification and NDR. Thus, our results suggest potential avenues for controlling their functions by chemically manipulating various parts of the diamondoid molecule, thus extending the applications of diamondoids in nanoscale integrated circuits.
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Cui XY, Tinholt M, Stavik B, Dahm AEA, Kanse S, Jin Y, Seidl S, Sahlberg KK, Iversen N, Skretting G, Sandset PM. Effect of hypoxia on tissue factor pathway inhibitor expression in breast cancer. J Thromb Haemost 2016; 14:387-96. [PMID: 26598923 DOI: 10.1111/jth.13206] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [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: 06/18/2015] [Accepted: 11/04/2015] [Indexed: 12/28/2022]
Abstract
UNLABELLED ESSENTIALS: A hypoxic microenvironment is a common feature of tumors that may influence activation of coagulation. MCF-7 and SK-BR-3 breast cancer cells and breast cancer tissue samples were used. The results showed transcriptional repression of tissue factor pathway inhibitor expression in hypoxia. Hypoxia-inducible factor 1α may be a target for the therapy of cancer-related coagulation and thrombosis. BACKGROUND Activation of coagulation is a common finding in patients with cancer, and is associated with an increased risk of venous thrombosis. As a hypoxic microenvironment is a common feature of solid tumors, we investigated the role of hypoxia in the regulation of tissue factor (TF) pathway inhibitor (TFPI) expression in breast cancer. OBJECTIVES To explore the transcriptional regulation of TFPI by hypoxia-inducible factor (HIF)-1α in breast cancer cells and their correlation in breast cancer tissues. METHODS AND RESULTS MCF-7 and SK-BR-3 breast cancer cells were cultured in 1% oxygen or treated with cobalt chloride (CoCl2 ) to mimic hypoxia. Time-dependent and dose-dependent downregulation of TFPI mRNA (quantitative RT-PCR) and of free TFPI protein (ELISA) were observed in hypoxia. Western blotting showed parallel increases in the levels of HIF-1α protein and TF. HIF-1α inhibitor abolished or attenuated the hypoxia-induced downregulation of TFPI. Luciferase reporter assay showed that both hypoxia and HIF-1α overexpression caused strong repression of TFPI promoter activity. Subsequent chromatin immunoprecipitation and mutagenesis analysis demonstrated a functional hypoxia response element within the TFPI promoter, located at -1065 to -1060 relative to the transcriptional start point. In breast cancer tissue samples, gene expression analyses showed a positive correlation between the mRNA expression of TFPI and that of HIF-1α. CONCLUSIONS This study demonstrates that HIF-1α is involved in the transcriptional regulation of the TFPI gene, and suggests that a hypoxic microenvironment inside a breast tumor may induce a procoagulant state in breast cancer patients.
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Affiliation(s)
- X Y Cui
- Department of Hematology, Oslo University Hospital, Oslo, Norway
- Department of Hematology, the First Affiliated Hospital of Zhengzhou University, Zhengzhou, China
- Research Institute of Internal Medicine, Oslo University Hospital, Oslo, Norway
- Institute of Clinical Medicine, University of Oslo, Oslo, Norway
| | - M Tinholt
- Department of Hematology, Oslo University Hospital, Oslo, Norway
- Research Institute of Internal Medicine, Oslo University Hospital, Oslo, Norway
- Institute of Clinical Medicine, University of Oslo, Oslo, Norway
- Department of Medical Genetics, Oslo University Hospital, Oslo, Norway
| | - B Stavik
- Department of Hematology, Oslo University Hospital, Oslo, Norway
- Research Institute of Internal Medicine, Oslo University Hospital, Oslo, Norway
| | - A E A Dahm
- Department of Hematology, the First Affiliated Hospital of Zhengzhou University, Zhengzhou, China
- Institute of Clinical Medicine, University of Oslo, Oslo, Norway
- Department of Hematology, Akershus University Hospital, Lørenskog, Norway
| | - S Kanse
- Department of Hematology, Oslo University Hospital, Oslo, Norway
- Research Institute of Internal Medicine, Oslo University Hospital, Oslo, Norway
- Institute of Basal Medical Sciences, University of Oslo, Oslo, Norway
| | - Y Jin
- Department of Biosciences, University of Oslo, Oslo, Norway
| | - S Seidl
- Department of Hematology, Oslo University Hospital, Oslo, Norway
- Research Institute of Internal Medicine, Oslo University Hospital, Oslo, Norway
- Institute of Basal Medical Sciences, University of Oslo, Oslo, Norway
| | - K K Sahlberg
- Department of Research, Vestre Viken Hospital Trust, Drammen, Norway
- K. G. Jebsen Center for Breast Cancer Research, University of Oslo, Oslo, Norway
- Oslo Breast Cancer Research Consortium (OSBREAC), Oslo, Norway
| | - N Iversen
- Department of Medical Genetics, Oslo University Hospital, Oslo, Norway
| | - G Skretting
- Department of Hematology, Oslo University Hospital, Oslo, Norway
- Research Institute of Internal Medicine, Oslo University Hospital, Oslo, Norway
| | - P M Sandset
- Department of Hematology, Oslo University Hospital, Oslo, Norway
- Research Institute of Internal Medicine, Oslo University Hospital, Oslo, Norway
- Institute of Clinical Medicine, University of Oslo, Oslo, Norway
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Tawfik SA, Cui XY, Ringer SP, Stampfl C. Communication: Electrical rectification of C59N: The role of anchoring and doping sites. J Chem Phys 2016; 144:021101. [PMID: 26772547 DOI: 10.1063/1.4940142] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023] Open
Abstract
Based on the nonequilibrium Green's function formalism and density-functional theory, we investigate the onset of electrical rectification in a single C59N molecule in conjunction with gold electrodes. Our calculations reveal that rectification is dependent upon the anchoring of the Au atom on C59N; when the Au electrode is singly bonded to a C atom (labeled here as A), the system does not exhibit rectification, whereas when the electrode is connected to the C-C bridge site between two hexagonal rings (labeled here as B), transmission asymmetry is observed, where the rectification ratio reaches up to 2.62 at ±1 V depending on the N doping site relative to the anchoring site. Our analysis of the transmission mechanism shows that N doping of the B configuration causes rectification because more transmission channels are available for transmission in the B configuration than in the A configuration.
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Affiliation(s)
| | - X Y Cui
- Australian Centre for Microscopy and Microanalysis, and School of Aerospace, Mechanical and Mechatronic Engineering, The University of Sydney, Sydney, New South Wales 2006, Australia
| | - S P Ringer
- Australian Centre for Microscopy and Microanalysis, and School of Aerospace, Mechanical and Mechatronic Engineering, The University of Sydney, Sydney, New South Wales 2006, Australia
| | - C Stampfl
- School of Physics, The University of Sydney, Sydney, New South Wales 2006, Australia
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Cui XY, Chen ZY, Wu L, Liu XQ, Dong YY, Wang FW, Li HY. rbcS SRS4 promoter from Glycine max and its expression activity in transgenic tobacco. Genet Mol Res 2015; 14:7395-405. [PMID: 26214418 DOI: 10.4238/2015.july.3.15] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Abstract
The regulatory region of the ribulose-1,5-bisphosphate carboxylase small subunit gene SRS4 from soybean (Glycine max) was cloned using TAIL-PCR and general PCR, and named the rbcS promoter. The promoter was fused with the GUS gene and introduced into Nicotiana tabacum via Agrobacterium-mediated leaf disk transformation. In 4-week-old transgenic tobacco plants, the highest GUS expression levels were observed in the leaves, GUS activity was 7.13- and 7.40-fold higher in leaves than in stems and roots, respectively. Moreover, GUS activity was stimulated by light. In conclusion, spatial and light regulation of the soybean rbcS promoter was observed in N. tabacum, thus illustrating a leaf-specific and light-induced promoter.
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Affiliation(s)
- X Y Cui
- College of Life Sciences, Jilin Agricultural University, Changchun, China
| | - Z Y Chen
- College of Agronomy, Jilin Agricultural University, Changchun, China
| | - L Wu
- College of Life Sciences, Jilin Agricultural University, Changchun, China
| | - X Q Liu
- College of Life Sciences, Jilin Agricultural University, Changchun, China
| | - Y Y Dong
- Ministry of Education Engineering Research Center of Bioreactor and Pharmaceutical Development, Jilin Agricultural University, Changchun, China
| | - F W Wang
- Ministry of Education Engineering Research Center of Bioreactor and Pharmaceutical Development, Jilin Agricultural University, Changchun, China
| | - H Y Li
- Ministry of Education Engineering Research Center of Bioreactor and Pharmaceutical Development, Jilin Agricultural University, Changchun, China
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Liu J, Cui XY, Yang YQ, Gao W, Sun L, Dong YC, Kou XJ. Effects of high-intensity treadmill training on timeliness and plasticity expression of irisin in mice. Eur Rev Med Pharmacol Sci 2015; 19:2168-2173. [PMID: 26166638] [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: 06/04/2023]
Abstract
OBJECTIVE The purpose of this study was to investigate effects of high-intensity aerobic exercise training on timeliness and plasticity expression of irisin in mice and change of FNDC5, ACCβ expression, and to explore possible ways to influence its mechanism of fatty acid metabolism. MATERIALS AND METHODS Adult male mice of specific pathogen-free grade [Kunming mice, (20 ± 2) g] are randomly divided into 4 groups. Wherein the first group is immediately after one-time exercise groups: including control group (CN group 1), 0.5 h exercise group (group 2), 1 h exercise group (group 3), 1.5 h exercise group (group 4) and 2 h exercise group (group 5), each for 10. The second group is rest after one-time 60 min exercise groups: including control group (CN group 1), rest 20 min groups (groups 2), rest 40 min group (group 3), rest 60 min group (groups 4), rest 80 min group (group 5), each for 10. Third group is immediately after long-term exercise groups: including the control group (CN group 1), 0.5 h exercise group (group 2), 1 h exercise group (group 3), 1.5 h exercise group (group 4) and 2 h exercise group (group 5), each for 10. The fourth group is rest after long-term 60 min exercise group: including control group (CN group 1), rest 20 min group (group 2), rest 40 min group (group 3), rest 60 min group (4 groups) and rest 80 min groups (5 groups), each for 10. RESULTS With the extension of a one-time high-intensity exercise time, the mouse FNDC5 protein, P-ACCβ / ACCβ ratio showed fluctuations, and opposite trends between the two, its turning points are 1.5 h; FNDC5 protein and P-ACCβ / ACCβ ratio with long-term exercise in mice at different time produce adaptability; the regulation of exercise induced irisin timeliness and plasticity reflected after a long-term exercise irisin expression in serum showed a steady decline in trend and return to normal levels, compared to a one-time exercise, expression of irisin is more stable. CONCLUSIONS With the high-intensity exercise a one-time extension of time, the mouse FNDC5 proteins, P-ACCβ / ACCβ ratio showed fluctuations, and both changes in the opposite trend, its turning points are 1.5 h; the long-term exercise can produce FNDC5 proteins, P-ACCβ / ACCβ ratios adaptable, more stable expression of the irisin curve after long-term exercise compared to a one-time exercise.
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Affiliation(s)
- J Liu
- College of Health Sciences, Wuhan Sports University, Wuhan, China.
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Abdulkader Tawfik S, Cui XY, Carter DJ, Ringer SP, Stampfl C. Sensing sulfur-containing gases using titanium and tin decorated zigzag graphene nanoribbons from first-principles. Phys Chem Chem Phys 2015; 17:6925-32. [PMID: 25679359 DOI: 10.1039/c4cp05919k] [Citation(s) in RCA: 48] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Atom implantation in graphene or graphene nanoribbons offers a rich opportunity to tune the material structure and functional properties. In this study, zigzag graphene nanoribbons with Ti or Sn adatoms stabilised on a double carbon vacancy site are theoretically studied to investigate their sensitivity to sulfur-containing gases (H2S and SO2). Due to the abundance of oxygen in the atmosphere, we also consider the sensitivity of the structures in the presence of oxygen. Density functional theory calculations are performed to determine the adsorption geometry and energetics, and nonequilibrium Green's function method is employed to compute the current-voltage characteristics of the considered systems. Our results demonstrate the sensitivity of both Ti- and Sn-doped systems to H2S, and the mild sensitivity of Ti-doped sensor systems to SO2. The Ti-doped sensor structure exhibits sensitivity to H2S with or without oxidation, while oxidation of the Sn-doped sensor structure reduces its ability to adsorb H2S and SO2 molecules. Interestingly, oxygen dissociates on the Ti-doped sensor structure, but it does not affect the sensor's response to the H2S gas species. Oxidation prevents the dissociation of the H-S bond when H2S adsorbs on the Ti-doped structure, thus enhancing its reusability for this gas species. Our study suggests the potential of Ti- and Sn-doped graphene in selective gas sensing, irrespective of the sensing performance of the bulk oxides.
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Feng ZJ, Cui XY, Cui XY, Chen M, Yang GX, Ma YZ, He GY, Xu ZS. The soybean GmDi19-5 interacts with GmLEA3.1 and increases sensitivity of transgenic plants to abiotic stresses. Front Plant Sci 2015; 6:179. [PMID: 25852726 PMCID: PMC4371698 DOI: 10.3389/fpls.2015.00179] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/11/2015] [Accepted: 03/05/2015] [Indexed: 05/29/2023]
Abstract
Drought-induced (Di19) proteins played important roles in plant growth, development, and abiotic stress responses. In the present study, a total of seven Di19 genes were identified in soybean. Each soybean Di19 gene showed specific responses to salt, drought, oxidative, and ABA stresses based on expression profiles. With a relatively higher transcript level among Di19 members under four stress treatments, GmDi19-5 was selected for detailed analysis. Inhibitor assays revealed that ABA inhibitor (Fluridone) or H2O2 inhibitor (DMTU) was involved in the drought- or salt-induced transcription of GmDi19-5. The GUS activity driven by the GmDi19-5 promoter was induced by salt, PEG, ABA, and MV treatments and tended to be accumulated in the vascular bundles and young leaves. A subcellular localization assay showed that GmDi19-5 protein localized in the nucleus. Further investigation showed that GmDi19-5 protein was involved in the interaction with GmLEA3.1. Overexpression of GmDi19-5 increased sensitivity of transgenic Arabidopsis plants to salt, drought, oxidative, and ABA stresses and regulated expression of several ABA/stress-associated genes. This present investigation showed that GmDi19-5 functioned as a negative factor under abiotic stresses and was involved in ABA and SOS signaling pathway by altering transcription of stress-associated genes.
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Affiliation(s)
- Zhi-Juan Feng
- The Genetic Engineering International Cooperation Base of Chinese Ministry of Science and Technology, Key Laboratory of Molecular Biophysics of Chinese Ministry of Education, College of Life Science and Technology, Huazhong University of Science and TechnologyWuhan, China
- Institute of Crop Science, Chinese Academy of Agricultural Sciences/National Key Facility for Crop Gene Resources and Genetic Improvement, Key Laboratory of Biology and Genetic Improvement of Triticeae Crops, Ministry of AgricultureBeijing, China
| | - Xiao-Yu Cui
- Institute of Crop Science, Chinese Academy of Agricultural Sciences/National Key Facility for Crop Gene Resources and Genetic Improvement, Key Laboratory of Biology and Genetic Improvement of Triticeae Crops, Ministry of AgricultureBeijing, China
| | - Xi-Yan Cui
- College of Life Sciences, Jilin Agricultural UniversityChangchun, China
| | - Ming Chen
- Institute of Crop Science, Chinese Academy of Agricultural Sciences/National Key Facility for Crop Gene Resources and Genetic Improvement, Key Laboratory of Biology and Genetic Improvement of Triticeae Crops, Ministry of AgricultureBeijing, China
| | - Guang-Xiao Yang
- The Genetic Engineering International Cooperation Base of Chinese Ministry of Science and Technology, Key Laboratory of Molecular Biophysics of Chinese Ministry of Education, College of Life Science and Technology, Huazhong University of Science and TechnologyWuhan, China
| | - You-Zhi Ma
- Institute of Crop Science, Chinese Academy of Agricultural Sciences/National Key Facility for Crop Gene Resources and Genetic Improvement, Key Laboratory of Biology and Genetic Improvement of Triticeae Crops, Ministry of AgricultureBeijing, China
| | - Guang-Yuan He
- The Genetic Engineering International Cooperation Base of Chinese Ministry of Science and Technology, Key Laboratory of Molecular Biophysics of Chinese Ministry of Education, College of Life Science and Technology, Huazhong University of Science and TechnologyWuhan, China
| | - Zhao-Shi Xu
- Institute of Crop Science, Chinese Academy of Agricultural Sciences/National Key Facility for Crop Gene Resources and Genetic Improvement, Key Laboratory of Biology and Genetic Improvement of Triticeae Crops, Ministry of AgricultureBeijing, China
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Abstract
Bean common mosaic virus (BCMV) is a member of the genus Potyvirus and one of the numerous viruses that can infect Phaseolus vulgaris. In May of 2013, we planted more than 100 varieties of mungbean in fields and a greenhouse of Nanjing. Mungbean (Vigna radiata (Linn.) Wilczek.) with leaves displaying mosaic and shrinkage typical of viral infection was observed in a greenhouse and a field in Nanjing. About 60% of the varieties can be infected. The symptoms in some sources from Southeast Asian countries and wild germplasm are heavier, while the symptoms are lighter on the local varieties. It can be transmitted to mungbean via aphid or mechanical inoculation, or by seeds. The infected leaves were collected for electron micrograph analysis. Pinwheel inclusion and filamentous virus particles were observed, indicating a Potyvirus infection. To confirm the presence of Potyvirus infection, total RNA was extracted from plants from the greenhouse and field, and RT-PCR was performed using universal Potyvirus primers (Sprimer (+) 5'-GGXAAYAAYAGYGGXCAZCC-3'; X=A, G, C or T, Y=T or C, Z=A or G); M4T (5'-GTTTTCCCAGTCACGAC(T)-3'), which amplify a region of the 3' fragment of the RNA-dependent RNA polymerase of potyviruses (1). The 596-bp sequence was found to be 95% identical to the BCMV isolate HB (GenBank Accession No. KC478389.1). To confirm the presence of BCMV, three leaf samples were randomly collected and all were determined to be positive when subjected to ELISA using BCMV-specific antibodies. The virus infecting mungbean was identified as BCMV and the strain was named BCMV-JAAS (KJ866945). Using gene-specific primers (BCMV-cp-F: 5'-CAAAAGGACAAGGATTGAGGA, BCMV-cp-R: 3'-ACAACAAACATTGCCGTAGC) for the reported coat protein gene in BCMV, a 1,080-bp gene fragment was amplified from the total RNA of the isolate, and subsequent sequence analysis indicated that an 862-bp region contained the complete cp gene that encodes a 228 amino acid protein. The nucleotide sequences of the cp gene from the isolate shared 96% homology with the reported BCMV-HB. The phylogenetic trees based on the CP gene show that BCMV-JAAS (KJ866945) was most closely related to other Chinese BCMV isolates (KF439722.1 and AJ132145.1) followed by Azuki mosaic virus (AB012663.1) and Peanut stripe virus (U34972.1). These results indicate that the virus associated with the mosaic disease in mungbean is an isolate of BCMV. To our knowledge, this is the first report of BCMV infecting mungbean in China. BCMV affects a wide range of legume crops and can spread rapidly, causing serious harm. The discovery could effectively control BCMV and characterize the prevalent BCMV strains. Research utilizing whole-genome sequencing of the mungbean isolate is continuing and is currently being expanded to characterize the genetic diversity of the virus, assisting in the study of the evolution of the virus. Reference: (1) J. Chen and J. P. Chen. Chin. J. Virol. 18:372, 2002.
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Affiliation(s)
- X Y Cui
- Institute of Vegetable Crops, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, P. R. China
| | - L Shen
- Institute of Vegetable Crops, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, P. R. China
| | - X X Yuan
- Institute of Vegetable Crops, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, P. R. China
| | - H P Gu
- Institute of Vegetable Crops, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, P. R. China
| | - X Chen
- Institute of Vegetable Crops, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, P. R. China
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Weston L, Cui XY, Ringer SP, Stampfl C. Density-functional prediction of a surface magnetic phase in SrTiO(3)/LaAlO(3) heterostructures induced by Al vacancies. Phys Rev Lett 2014; 113:186401. [PMID: 25396383 DOI: 10.1103/physrevlett.113.186401] [Citation(s) in RCA: 5] [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: 12/08/2013] [Indexed: 06/04/2023]
Abstract
Based on first-principles density functional calculations we propose a novel Al vacancy induced ferromagnetism occurring at the LaAlO(3) surface of SrTiO(3)/LaAlO(3) bilayers. Magnetism at cation vacancies away from the surface is quenched due to charge compensation. Magnetic surface Al vacancies are stabilized due to the built-in electric field inside the LaAlO(3) region that raises the energy of the defect level, making charge compensation unfavorable. Surface Al vacancies prefer to form clusters and exhibit two-dimensional ferromagnetic alignment mediated by a long-range magnetic interaction. These results are discussed in light of recent experimental observations.
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Affiliation(s)
- L Weston
- School of Physics, The University of Sydney, Sydney, New South Wales 2006, Australia
| | - X Y Cui
- Australian Centre for Microscopy and Microanalysis, The University of Sydney, Sydney, New South Wales 2006, Australia and School of Aerospace, Mechanical and Mechatronic Engineering, The University of Sydney, Sydney, New South Wales 2006, Australia
| | - S P Ringer
- Australian Centre for Microscopy and Microanalysis, The University of Sydney, Sydney, New South Wales 2006, Australia and School of Aerospace, Mechanical and Mechatronic Engineering, The University of Sydney, Sydney, New South Wales 2006, Australia
| | - C Stampfl
- School of Physics, The University of Sydney, Sydney, New South Wales 2006, Australia
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Yeoh WK, Cui XY, Gault B, De Silva KSB, Xu X, Liu HW, Yen HW, Wong D, Bao P, Larson DJ, Martin I, Li WX, Zheng RK, Wang XL, Dou SX, Ringer SP. On the roles of graphene oxide doping for enhanced supercurrent in MgB2 based superconductors. Nanoscale 2014; 6:6166-6172. [PMID: 24793305 DOI: 10.1039/c4nr00415a] [Citation(s) in RCA: 2] [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] [Indexed: 06/03/2023]
Abstract
Due to their graphene-like properties after oxygen reduction, incorporation of graphene oxide (GO) sheets into correlated-electron materials offers a new pathway for tailoring their properties. Fabricating GO nanocomposites with polycrystalline MgB2 superconductors leads to an order of magnitude enhancement of the supercurrent at 5 K/8 T and 20 K/4 T. Herein, we introduce a novel experimental approach to overcome the formidable challenge of performing quantitative microscopy and microanalysis of such composites, so as to unveil how GO doping influences the structure and hence the material properties. Atom probe microscopy and electron microscopy were used to directly image the GO within the MgB2, and we combined these data with computational simulations to derive the property-enhancing mechanisms. Our results reveal synergetic effects of GO, namely, via localized atomic (carbon and oxygen) doping as well as texturing of the crystals, which provide both inter- and intra-granular flux pinning. This study opens up new insights into how low-dimensional nanostructures can be integrated into composites to modify the overall properties, using a methodology amenable to a wide range of applications.
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Affiliation(s)
- W K Yeoh
- School of Aerospace, Mechanical and Mechatronic Engineering, The University of Sydney, New South Wales 2006, Australia.
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Wang YQ, Cui XY, Ren YY, Zhang Y. A highly enantioselective and regioselective organocatalytic direct Mannich reaction of methyl alkyl ketones with cyclic imines benzo[e][1,2,3]oxathiazine 2,2-dioxides. Org Biomol Chem 2014; 12:9101-4. [DOI: 10.1039/c4ob01902d] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A specific regioselective direct Mannich reaction of methyl alkyl ketones with cyclic imines benzo[e][1,2,3]oxathiazine 2,2-dioxides is realized with 87–97% ee.
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Affiliation(s)
- You-Qing Wang
- Provincial Key Laboratory of Natural Medicine and Immuno-Engineering
- College of Chemistry and Chemical Engineering
- Henan University
- Kaifeng, P. R. China
| | - Xiao-Yu Cui
- Provincial Key Laboratory of Natural Medicine and Immuno-Engineering
- College of Chemistry and Chemical Engineering
- Henan University
- Kaifeng, P. R. China
| | - Yuan-Yuan Ren
- Provincial Key Laboratory of Natural Medicine and Immuno-Engineering
- College of Chemistry and Chemical Engineering
- Henan University
- Kaifeng, P. R. China
| | - Yongna Zhang
- Provincial Key Laboratory of Natural Medicine and Immuno-Engineering
- College of Chemistry and Chemical Engineering
- Henan University
- Kaifeng, P. R. China
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Yang XL, Cui XY, Cui C, Ma HL, Yang Q. [Study on high-temperature phase change of tobermorite]. Guang Pu Xue Yu Guang Pu Fen Xi 2013; 33:2227-2230. [PMID: 24159882] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
In the present paper, the high-temperature phase change of pure tobermorite was investigated by TGA/DSC, X-ray diffraction and infrared spectroscopy (IR) respectively. The DSC results showed that four interlayer water molecules were lost when they were heated at 300 degrees C. As the temperature increased to 724 degrees C, Si-O-H bonds were cleaved and dehydroxylation occurred. The XRD results showed that many diffraction peaks o f tobermorite disappeared and the crystal structure was broken and collapsed. Then tobermorite tends to be disordered and amorphous. When the calcination temperature increased to 861 degrees C, the disordered structure recombined to wollastonite, and the crystal structure became ordered and stable. Finally, the structure completely transformed to 2M-wollastonite at 1 000 degrees C. It should include the process of high-temperature phase change of tobermorite: tobermorite --> dehydration tobermorite --> dehydroxylation tobermorite --> wollastonite.
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Affiliation(s)
- Xiu-Li Yang
- School of Materials Science and Engineering, Nanjing University of Science and Technology, Nanjing 210094, China.
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40
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Cui XY, Li L, Zheng RK, Liu ZW, Stampfl C, Ringer SP. Graphene based dots and antidots: a comparative study from first principles. J Nanosci Nanotechnol 2013; 13:1251-1255. [PMID: 23646613 DOI: 10.1166/jnn.2013.6118] [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] [Indexed: 06/02/2023]
Abstract
Graphene based quantum dots and antidots are two nanostructures of primary importance for their fundamental physics and technological applications, particularly in the emerging field of graphene-based nanoelectronics and nanospintronics. Herein, based on first principles density functional theory calculations, we report a comparative study on the electronic structure of these two structurally complementary entities, where the bandgap opening, edge magnetism and the role of hydrogenation are investigated. Our results show the diversity of electronic structures of various dots and antidots, whose properties are sensitive to the edge detailed geometry (including size and shape and edge type). Hydrogen passivation plays an essential roal in affecting the related properties, in particular, it leads to larger bandgap values and suppress the edge magnetism. The frontier orbital analysis is employed to rationalize and compare the complicated nature of dots and antidots. Based on the specific geometrical consideration and the total energy competition of the ground antiferromagnetic and the ferromagnetic states, some magnetic structures (the unpassivated 42-atom-antidot and 54-atom-dot) are proposed to be useful as magnetic switches.
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Affiliation(s)
- X Y Cui
- Australian Centre for Microscopy and Microanalysis, The University of Sydney, New South Wales 2006, Australia
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Wang YF, Cui XY, Hao YB, Mei XR, Yu GR, Huang XZ, Kang XM, Zhou XQ. The fluxes of CO2 from grazed and fenced temperate steppe during two drought years on the Inner Mongolia Plateau, China. Sci Total Environ 2011; 410-411:182-190. [PMID: 22024234 DOI: 10.1016/j.scitotenv.2011.09.067] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/25/2011] [Revised: 07/27/2011] [Accepted: 09/23/2011] [Indexed: 05/31/2023]
Abstract
The CO(2) flux was measured by the eddy covariance method on a temperate Leymus chinensis steppe over a period of 17 months spanning two consecutive growing seasons. The amount of precipitation was nearly normal, but it was low in the early and high in the late growing period in 2006. In the 2007 growing season, the amount of precipitation was about 45% less than the multi-year average and more evenly distributed. Comparisons were made between a moderately grazed site and a 28-year-old fenced site. The maximum instantaneous CO(2) release and uptake rates were 0.12 (May) and -0.11mg CO(2)m(-2)s(-1) (July) at the fenced site, and 0.11 and -0.16mg CO(2)m(-2)s(-1) (both in July) at the grazed site. In both growing seasons, the grazed site always had a higher daily uptake rate or lower release rate than the fenced site. The grazed site was a CO(2) sink during the growing season of 2007 and a CO(2) source in the growing season of 2006, whereas the fenced site was a CO(2) source in both seasons. Lower precipitation decreased CO(2) loss during the growing season more in the grazed site than in the fenced site, mainly because of depression of total ecosystem respiration (R(e)) in the former and stimulation in the latter. During the dormant season (from October to April), the fenced and grazed sites released 60.0 and 32.4g of C per m(2), respectively. Path analysis showed that temperature had the greatest effect on daily variation of ecosystem CO(2) exchange during the growing seasons at the two study sites. The results suggest that decrease of precipitation and/or increase of temperature will likely promote C loss from L. chinensis steppes, whether fenced or grazed, and that a grazed site is more sensitive.
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Affiliation(s)
- Y F Wang
- College of Life Sciences, Graduate University of Chinese Academy of Sciences, Beijing, 100049, China
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Cui XY, Jia F, Chen YX, Gan J. Influence of single-walled carbon nanotubes on microbial availability of phenanthrene in sediment. Ecotoxicology 2011; 20:1277-85. [PMID: 21656161 DOI: 10.1007/s10646-011-0684-3] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Accepted: 04/08/2011] [Indexed: 05/15/2023]
Abstract
Increasing production and use of single-walled carbon nanotubes (SWCNT) will inevitably lead to release of these nanoparticles to aquatic ecosystems. Similar to black carbon (BC) particles, SWCNT have a high affinity for hydrophobic organic contaminants (HOCs) and therefore the presence of SWCNT in sediment may lead to altered bioavailability of HOCs. We compared SWCNT with biochar and charcoal on their effect on the microbial degradability of 0.05 mg kg(-1) (14)C-phenanthrene (PHE) by Mycobacterium vanbaalenii PYR-1 in two sediments with different organic carbon (OC) contents. When the amendment rate of SWCNT or BC was 1 mg g(-1), PHE mineralization was inhibited much more significantly by SWCNT than by either biochar or charcoal. After 360 h of incubation, the mineralized fraction of PHE in the presence of SWCNT was 59.5% of the non-amended control in the sediment with low OC content, and only 42.4% in the other sediment with a higher OC content. Analysis of the freely dissolved concentration (C (free)) using disposable polydimethylsiloxane (PDMS) fibers showed that SWCNT decreased C (free) by 85-95%, apparently due to preferential sorption of PHE to SWCNT particles that had a much larger specific surface area and pore volume than biochar or charcoal. However, pre-interaction of SWCNT with dissolved organic matter (peptone, tannic acid, and humic acid) led to attachment of polar functional groups and reduced surface area on SWCNT, resulting in decreased PHE sorption and an alleviated effect on PHE biodegradation in the order of peptone > tannic acid > humic acid.
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Affiliation(s)
- X Y Cui
- Department of Environmental Sciences, University of California, Riverside, Riverside, CA 92521, USA.
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Yeoh WK, Gault B, Cui XY, Zhu C, Moody MP, Li L, Zheng RK, Li WX, Wang XL, Dou SX, Sun GL, Lin CT, Ringer SP. Direct observation of local potassium variation and its correlation to electronic inhomogeneity in (Ba(1-x)K(x))Fe2As2 pnictide. Phys Rev Lett 2011; 106:247002. [PMID: 21770591 DOI: 10.1103/physrevlett.106.247002] [Citation(s) in RCA: 7] [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: 02/28/2011] [Indexed: 05/31/2023]
Abstract
Local fluctuations in the distribution of dopant atoms are thought to cause the nanoscale electronic disorder or phase separation in pnictide superconductors. Atom probe tomography has enabled the first direct observations of dopant species clustering in a K-doped 122-phase pnictide. First-principles calculations suggest the coexistence of static magnetism and superconductivity on a lattice parameter length scale over a wide range of dopant concentrations. Our results provide evidence for a mixed scenario of phase coexistence and phase separation, depending on local dopant atom distributions.
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Affiliation(s)
- W K Yeoh
- Australian Centre for Microscopy & Microanalysis, University of Sydney, Sydney, New South Wales, Australia.
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Song YH, Qiu GL, Yuan P, Cui XY, Peng JF, Zeng P, Duan L, Xiang LC, Qian F. Nutrients removal and recovery from anaerobically digested swine wastewater by struvite crystallization without chemical additions. J Hazard Mater 2011; 190:140-149. [PMID: 21459509 DOI: 10.1016/j.jhazmat.2011.03.015] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/07/2010] [Revised: 02/19/2011] [Accepted: 03/05/2011] [Indexed: 05/30/2023]
Abstract
Anaerobically digested swine wastewater contains high concentrations of phosphorus (P) and nitrogen (N). A pilot-scale experiment was carried out for nutrients removal and recovery from anaerobically digested swine wastewater by struvite crystallization. In the pilot plant, a sequencing batch reactor (SBR) and a continuous-flow reactor with struvite accumulation devices were designed and employed. The wastewater pH value was increased by CO(2) stripping, and the struvite crystallization process was performed without alkali and Mg(2+) additions. Results of the long-term operation of the system showed that, both reactors provided up to 85% P removal and recovery over wide ranges of aeration times (1.0-4.0 h), hydraulic retention times (HRT) (6.0-15.0 h) and temperatures (0-29.5°C) for an extended period of 247 d, in which approximate 30% of P was recovered by the struvite accumulation devices. However, 40-90% of NH(4)(+)-N removed was through air stripping instead of being immobilized in the recovered solids. The recovered products were detected and analyzed by scanning electron microscope (SEM), X-ray diffraction (XRD) and chemical methods, which were proved to be struvite with purity of more than 90%. This work demonstrated the feasibility and effects of nutrients removal and recovery from anaerobically digested swine wastewater by struvite crystallization without chemical additions.
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Affiliation(s)
- Yong-Hui Song
- Chinese Research Academy of Environmental Sciences, Dayangfang 8, Anwai Beiyuan, Beijing 100012, China.
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Hofmann A, Cui XY, Schäfer J, Meyer S, Höpfner P, Blumenstein C, Paul M, Patthey L, Rotenberg E, Bünemann J, Gebhard F, Ohm T, Weber W, Claessen R. Renormalization of bulk magnetic electron states at high binding energies. Phys Rev Lett 2009; 102:187204. [PMID: 19518908 DOI: 10.1103/physrevlett.102.187204] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/31/2009] [Indexed: 05/27/2023]
Abstract
The quasiparticle dynamics of electrons in a magnetically ordered state is investigated by high-resolution angle-resolved photoemission of Ni(110) at 10 K. The self-energy is extracted for high binding energies reaching up to 500 meV, using a Gutzwiller calculation as a reference frame for correlated quasiparticles. Significant deviations exist in the 300 meV range, as identified on magnetic bulk bands for the first time. The discrepancy is strikingly well described by a self-energy model assuming interactions with spin excitations. Implications relating to different electron-electron correlation regimes are discussed.
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Affiliation(s)
- A Hofmann
- Physikalisches Institut, Universität Würzburg, 97074 Würzburg, Germany
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46
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Peng JF, Song YH, Yuan P, Cui XY, Qiu GL. The remediation of heavy metals contaminated sediment. J Hazard Mater 2009; 161:633-40. [PMID: 18547718 DOI: 10.1016/j.jhazmat.2008.04.061] [Citation(s) in RCA: 382] [Impact Index Per Article: 25.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/23/2007] [Revised: 03/19/2008] [Accepted: 04/21/2008] [Indexed: 05/09/2023]
Abstract
Heavy metal contamination has become a worldwide problem through disturbing the normal functions of rivers and lakes. Sediment, as the largest storage and resources of heavy metal, plays a rather important role in metal transformations. This paper provides a review on the geochemical forms, affecting factors and remediation technologies of heavy metal in sediment. The in situ remediation of sediment aims at increasing the stabilization of some metals such as the mobile and the exchangeable fractions; whereas, the ex situ remediation mainly aims at removing those potentially mobile metals, such as the Mn-oxides and the organic matter (OM) fraction. The pH and OM can directly change metals distribution in sediment; however oxidation-reduction potential (ORP), mainly through changing the pH values, indirectly alters metals distribution. Mainly ascribed to their simple operation mode, low costs and fast remediation effects, in situ remediation technologies, especially being fit for slight pollution sediment, are applied widely. However, for avoiding metal secondary pollution from sediment release, ex situ remediation should be the hot point in future research.
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Affiliation(s)
- Jian-Feng Peng
- Chinese Research Academy of Environmental Sciences, 100012 Beijing, China
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Liu YC, Qi ZW, Ma S, Cui XY, Wang HL, Guo SB, Wang Z, Yu XZ. [Apoptosis of gastric mucosa and gastric barrier dysfunction in acute ischemic stroke]. Zhongguo Yi Xue Ke Xue Yuan Xue Bao 2008; 30:149-152. [PMID: 18505114] [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: 05/26/2023]
Abstract
OBJECTIVE To evaluate the role of gastric mucosa apoptosis in the stress of ischemic stroke, and to discuss the relationship between gastric mucosa apoptosis and gastric barrier. METHODS Ten dogs were artificially made ischemic stroke by operation (IS group), and another 10 shamly-operated dogs were served as control group. Sucrose permeability were measured after the operation. All dogs were sacrificed 24 hours after operation to measure the gastric mucosal apoptosis index, gastric gross classification, and histological score. RESULTS The gastric mucosal apoptosis index in the IS group were significantly higher than in the control group (14.83 +/- 4.41 vs. 5.60 +/- 2.61, P < 0.05). The gastric mucosal apoptosis index were correlated with the sucrose permeability (r = 0. 89, P < 0.05) , gastric gross classification (r = 0. 87, P < 0.05), and histological score (r = 0.92, P < 0.05). CONCLUSIONS Although ischemic stroke will not cause the obvious damage in the respiratory and circulatory system, it is responsible for the apoptosis of epithelial cell in the gastric mucosa and gastric barrier dysfunction. The apoptosis index is closely correlated with the damage of the function and morphology of the gastric barrier, indicating that the epithelial cell apoptosis acceleration in the gastric mucosa may result in the damage of gastric barrier function.
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Affiliation(s)
- Ye-Cheng Liu
- Department of Emergency Medicine, PUMC Hospital, CAMS and PUMC, Beijing 100730, China
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48
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Cui XY, Delley B, Freeman AJ, Stampfl C. Magnetic metastability in tetrahedrally bonded magnetic III-nitride semiconductors. Phys Rev Lett 2006; 97:016402. [PMID: 16907389 DOI: 10.1103/physrevlett.97.016402] [Citation(s) in RCA: 7] [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] [Received: 04/09/2006] [Indexed: 05/11/2023]
Abstract
Results of density-functional calculations for isolated transition metal (TM = V, Cr, Mn, Fe, Co, Ni on cation sites) doped GaN demonstrate a novel magnetic metastability in dilute magnetic semiconductors. In addition to the expected high spin ground states (4muB/Mn and 5muB/Fe), there are also metastable low spin states (0muB/Mn and 1muB/Fe)--a phenomenon that can be explained in simple terms on the basis of the ligand field theory. The transition between the high spin and low spin states corresponds to an intraionic transfer of two electrons between the t2 and e orbitals, accompanied by a spin-flip process. The results suggest that TM-doped wideband semiconductors (such as GaN and AlN) may present a new type of light-induced spin-crossover material.
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Affiliation(s)
- X Y Cui
- School of Physics, The University of Sydney, Sydney 2006, New South Wales, Australia
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Cui XY, Medvedeva JE, Delley B, Freeman AJ, Newman N, Stampfl C. Role of embedded clustering in dilute magnetic semiconductors: Cr doped GaN. Phys Rev Lett 2005; 95:256404. [PMID: 16384484 DOI: 10.1103/physrevlett.95.256404] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/20/2005] [Indexed: 05/05/2023]
Abstract
Results of extensive density-functional studies provide direct evidence that Cr atoms in Cr:GaN have a strong tendency to form embedded clusters, occupying Ga sites. Significantly, for larger than 2-Cr-atom clusters, states containing antiferromagnetic coupling with net spin in the range 0.06-1.47 muB/Cr are favored. We propose a picture where various configurations coexist and the statistical distribution and associated magnetism will depend sensitively on the growth details. Such a view may elucidate many puzzling observations related to the structural and magnetic properties of III-N and other dilute semiconductors.
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Affiliation(s)
- X Y Cui
- School of Physics, The University of Sydney, Sydney 2006, New South Wales, Australia
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Medvedeva JE, Freeman AJ, Cui XY, Stampfl C, Newman N. Half-metallicity and efficient spin injection in AlN/GaN:Cr (0001) heterostructure. Phys Rev Lett 2005; 94:146602. [PMID: 15904088 DOI: 10.1103/physrevlett.94.146602] [Citation(s) in RCA: 7] [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] [Received: 10/18/2004] [Indexed: 05/02/2023]
Abstract
First-principles investigations of the structural, electronic, and magnetic properties of Cr-doped AlN/GaN (0001) heterostructures reveal the possibility of efficient spin injection from a ferromagnetic GaN:Cr electrode through an AlN tunnel barrier. We demonstrate that Cr atoms segregate into the GaN region and that these interfaces retain their half-metallic behavior leading to a complete, i.e., 100%, spin polarization of the conduction electrons. This property makes the wide band-gap nitrides doped with Cr to be excellent candidates for high-efficiency magnetoelectronic devices.
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Affiliation(s)
- J E Medvedeva
- Physics and Astronomy Department, Northwestern University, Evanston, Illinois 60208-3112, USA
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