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The Mesoproterozoic Baoban Complex, South China: A missing fragment of western Laurentian lithosphere 期刊论文
GEOLOGICAL SOCIETY OF AMERICA BULLETIN, 2020, 132 (7-8) : 1404-1418
作者:  Xu, Ya-Jun;  Cawood, Peter A.;  Zhang, Hang-Chuan;  Zi, Jian-Wei;  Zhou, Jin-Bo;  Li, Li-Xing;  Du, Yuan-Sheng
收藏  |  浏览/下载:15/0  |  提交时间:2020/08/18
Strain engineering and epitaxial stabilization of halide perovskites 期刊论文
NATURE, 2020, 577 (7789) : 209-+
作者:  Chen, Yimu;  Lei, Yusheng;  Li, Yuheng;  Yu, Yugang;  Cai, Jinze;  Chiu, Ming-Hui;  Rao, Rahul;  Gu, Yue;  Wang, Chunfeng;  Choi, Woojin;  Hu, Hongjie;  Wang, Chonghe;  Li, Yang;  Song, Jiawei;  Zhang, Jingxin;  Qi, Baiyan;  Lin, Muyang;  Zhang, Zhuorui;  Islam, Ahmad E.;  Maruyama, Benji;  Dayeh, Shadi;  Li, Lain-Jong;  Yang, Kesong;  Lo, Yu-Hwa;  Xu, Sheng
收藏  |  浏览/下载:26/0  |  提交时间:2020/07/03

Strain engineering is a powerful tool with which to enhance semiconductor device performance(1,2). Halide perovskites have shown great promise in device applications owing to their remarkable electronic and optoelectronic properties(3-5). Although applying strain to halide perovskites has been frequently attempted, including using hydrostatic pressurization(6-8), electrostriction(9), annealing(10-12), van der Waals force(13), thermal expansion mismatch(14), and heat-induced substrate phase transition(15), the controllable and device-compatible strain engineering of halide perovskites by chemical epitaxy remains a challenge, owing to the absence of suitable lattice-mismatched epitaxial substrates. Here we report the strained epitaxial growth of halide perovskite single-crystal thin films on lattice-mismatched halide perovskite substrates. We investigated strain engineering of a-formamidinium lead iodide (alpha-FAPbI(3)) using both experimental techniques and theoretical calculations. By tailoring the substrate composition-and therefore its lattice parameter-a compressive strain as high as 2.4 per cent is applied to the epitaxial alpha-FAPbI(3) thin film. We demonstrate that this strain effectively changes the crystal structure, reduces the bandgap and increases the hole mobility of alpha-FAPbI(3). Strained epitaxy is also shown to have a substantial stabilization effect on the alpha-FAPbI(3) phase owing to the synergistic effects of epitaxial stabilization and strain neutralization. As an example, strain engineering is applied to enhance the performance of an alpha-FAPbI(3)-based photodetector.


  
The Mantle Transition Zone Hosts the Missing HIMU Reservoir Beneath Eastern China 期刊论文
GEOPHYSICAL RESEARCH LETTERS, 2020, 47 (9)
作者:  Qian, Sheng-Ping;  Nichols, Alexander R. L.;  Zhang, Le;  Xu, Yi-Gang;  Li, Jie;  Guo, Yu-Long;  Ren, Zhong-Yuan
收藏  |  浏览/下载:9/0  |  提交时间:2020/07/02
late Cenozoic basalts  HIMU component  mantle transition zone  carbonated mantle source  
A preliminary study on wind tunnel simulations of the explosive growth and dissipation of fine particulate matter in ambient air 期刊论文
ATMOSPHERIC RESEARCH, 2020, 235
作者:  Xu, Jingxin;  Zhu, Fahua;  Wang, Sheng;  Zhao, Xiuyong;  Zhang, Ming;  Ge, Xinlei;  Wang, Junfeng;  Tian, Wenxin;  Wang, Liwen;  Yang, Liu;  Ding, Li;  Lu, Xiaobo;  Chen, Xinxin;  Zheng, Youfei;  Guo, Zhaobing
收藏  |  浏览/下载:10/0  |  提交时间:2020/07/02
Wind tunnel  Fine particulate matter  Explosive growth  Dissipation  Relative humidity  Liquid water content  
A lower X-gate in TASK channels traps inhibitors within the vestibule 期刊论文
NATURE, 2020
作者:  Chen, Tao;  Nomura, Kinya;  Wang, Xiaolin;  Sohrabi, Reza;  Xu, Jin;  Yao, Lingya;  Paasch, Bradley C.;  Ma, Li;  Kremer, James;  Cheng, Yuti;  Zhang, Li;  Wang, Nian;  Wang, Ertao;  Xin, Xiu-Fang;  He, Sheng Yang
收藏  |  浏览/下载:32/0  |  提交时间:2020/07/03

TWIK-related acid-sensitive potassium (TASK) channels-members of the two pore domain potassium (K-2P) channel family-are found in neurons(1), cardiomyocytes(2-4) and vascular smooth muscle cells(5), where they are involved in the regulation of heart rate(6), pulmonary artery tone(5,7), sleep/wake cycles(8) and responses to volatile anaesthetics(8-11). K-2P channels regulate the resting membrane potential, providing background K+ currents controlled by numerous physiological stimuli(12-15). Unlike other K-2P channels, TASK channels are able to bind inhibitors with high affinity, exceptional selectivity and very slow compound washout rates. As such, these channels are attractive drug targets, and TASK-1 inhibitors are currently in clinical trials for obstructive sleep apnoea and atrial fibrillation(16). In general, potassium channels have an intramembrane vestibule with a selectivity filter situated above and a gate with four parallel helices located below  however, the K-2P channels studied so far all lack a lower gate. Here we present the X-ray crystal structure of TASK-1, and show that it contains a lower gate-which we designate as an '  X-gate'  -created by interaction of the two crossed C-terminal M4 transmembrane helices at the vestibule entrance. This structure is formed by six residues ((VLRFMT248)-V-243) that are essential for responses to volatile anaesthetics(10), neurotransmitters(13) and G-protein-coupled receptors(13). Mutations within the X-gate and the surrounding regions markedly affect both the channel-open probability and the activation of the channel by anaesthetics. Structures of TASK-1 bound to two high-affinity inhibitors show that both compounds bind below the selectivity filter and are trapped in the vestibule by the X-gate, which explains their exceptionally low washout rates. The presence of the X-gate in TASK channels explains many aspects of their physiological and pharmacological behaviour, which will be beneficial for the future development and optimization of TASK modulators for the treatment of heart, lung and sleep disorders.


The X-ray crystal structure of the potassium channel TASK-1 reveals the presence of an X-gate, which traps small-molecule inhibitors in the intramembrane vestibule and explains their low washout rates from the channel.


  
Action of a minimal contractile bactericidal nanomachine 期刊论文
NATURE, 2020, 580 (7805) : 658-+
作者:  Peng, Ruchao;  Xu, Xin;  Jing, Jiamei;  Wang, Min;  Peng, Qi;  Liu, Sheng;  Wu, Ying;  Bao, Xichen;  Wang, Peiyi;  Qi, Jianxun;  Gao, George F.;  Shi, Yi
收藏  |  浏览/下载:12/0  |  提交时间:2020/07/03

The authors report near-atomic resolution structures of the R-type bacteriocin from Pseudomonas aeruginosa in the pre-contraction and post-contraction states, and these structures provide insight into the mechanism of action of molecular syringes.


R-type bacteriocins are minimal contractile nanomachines that hold promise as precision antibiotics(1-4). Each bactericidal complex uses a collar to bridge a hollow tube with a contractile sheath loaded in a metastable state by a baseplate scaffold(1,2). Fine-tuning of such nucleic acid-free protein machines for precision medicine calls for an atomic description of the entire complex and contraction mechanism, which is not available from baseplate structures of the (DNA-containing) T4 bacteriophage(5). Here we report the atomic model of the complete R2 pyocin in its pre-contraction and post-contraction states, each containing 384 subunits of 11 unique atomic models of 10 gene products. Comparison of these structures suggests the following sequence of events during pyocin contraction: tail fibres trigger lateral dissociation of baseplate triplexes  the dissociation then initiates a cascade of events leading to sheath contraction  and this contraction converts chemical energy into mechanical force to drive the iron-tipped tube across the bacterial cell surface, killing the bacterium.


  
Temporal variation in I-129 and I-127 in aerosols from Xi'an, China: influence of East Asian monsoon and heavy haze events 期刊论文
ATMOSPHERIC CHEMISTRY AND PHYSICS, 2020, 20 (4) : 2623-2635
作者:  Zhang, Luyuan;  Hou, Xiaolin;  Xu, Sheng;  Feng, Tian;  Cheng, Peng;  Fu, Yunchong;  Chen, Ning
收藏  |  浏览/下载:12/0  |  提交时间:2020/07/02
Phosphorus alleviation of nitrogen-suppressed methane sink in global grasslands 期刊论文
ECOLOGY LETTERS, 2020, 23 (5) : 821-830
作者:  Zhang, Lihua;  Yuan, Fenghui;  Bai, Junhong;  Duan, Hongtao;  Gu, Xueying;  Hou, Longyu;  Huang, Yao;  Yang, Mingan;  He, Jin-Sheng;  Zhang, Zhenhua;  Yu, Lijun;  Song, Changchun;  Lipson, David A.;  Zona, Donatella;  Oechel, Walter;  Janssens, Ivan A.;  Xu, Xiaofeng
收藏  |  浏览/下载:16/0  |  提交时间:2020/07/02
Grassland  methane  nitrogen  phosphorus  substrate competition theory  
Signatures of self-organized criticality in an ultracold atomic gas (vol 577, pg 481, 2020) 期刊论文
NATURE, 2020, 579 (7800) : E13-E13
作者:  Zhou, Xiaoling;  Feng, Zongqiang;  Zhu, Linli;  Xu, Jianing;  Miyagi, Lowell;  Dong, Hongliang;  Sheng, Hongwei;  Wang, Yanju;  Li, Quan;  Ma, Yanming;  Zhang, Hengzhong;  Yan, Jinyuan;  Tamura, Nobumichi;  Kunz, Martin;  Lutker, Katie;  Huang, Tianlin;  Hughes, Darcy A.;  Huang, Xiaoxu;  Chen, Bin
收藏  |  浏览/下载:15/0  |  提交时间:2020/07/03

An amendment to this paper has been published and can be accessed via a link at the top of the paper.


  
Dramatic increase in reactive volatile organic compound (VOC) emissions from ships at berth after implementing the fuel switch policy in the Pearl River Delta Emission Control Area 期刊论文
ATMOSPHERIC CHEMISTRY AND PHYSICS, 2020, 20 (4) : 1887-1900
作者:  Wu, Zhenfeng;  Zhang, Yanli;  He, Junjie;  Chen, Hongzhan;  Huang, Xueliang;  Wang, Yujun;  Yu, Xu;  Yang, Weiqiang;  Zhang, Runqi;  Zhu, Ming;  Li, Sheng;  Fang, Hua;  Zhang, Zhou;  Wang, Xinming
收藏  |  浏览/下载:10/0  |  提交时间:2020/07/02