National Science ReviewPub Date : 2024-09-20eCollection Date: 2024-10-01DOI: 10.1093/nsr/nwae336
Guoqiang Yuan, Yichun Su, Xiangling Zhang, Biao Gao, Jinliang Hu, Yangyang Sun, Wenting Li, Zhan Zhang, Mohsen Shakouri, Huan Pang
{"title":"Charged organic ligands inserting/supporting the nanolayer spacing of vanadium oxides for high-stability/efficiency zinc-ion batteries.","authors":"Guoqiang Yuan, Yichun Su, Xiangling Zhang, Biao Gao, Jinliang Hu, Yangyang Sun, Wenting Li, Zhan Zhang, Mohsen Shakouri, Huan Pang","doi":"10.1093/nsr/nwae336","DOIUrl":"10.1093/nsr/nwae336","url":null,"abstract":"<p><p>Given their high safety, environmental friendliness and low cost, aqueous zinc-ion batteries (AZIBs) have the potential for high-performance energy storage. However, issues with the structural stability and electrochemical kinetics during discharge/charge limit the development of AZIBs. In this study, vanadium oxide electrodes with organic molecular intercalation were designed based on intercalating 11 kinds of charged organic carboxylic acid ligands between 2D layers to regulate the interlayer spacing. The negatively charged carboxylic acid group can neutralize Zn<sup>2+</sup>, reduce electrostatic repulsion and enhance electrochemical kinetics. The intercalated organic molecules increased the interlayer spacing. Among them, the 0.028EDTA · 0.28NH<sub>4</sub> <sup>+</sup> · V<sub>2</sub>O<sub>5</sub> · 0.069H<sub>2</sub>O was employed as the cathode with a high specific capacity (464.6 mAh g<sup>-1</sup> at 0.5 A g<sup>-1</sup>) and excellent rate performance (324.4 mAh g<sup>-1</sup> at 10 A g<sup>-1</sup>). Even at a current density of 20 A g<sup>-1</sup>, the specific capacity after 2000 charge/discharge cycles was 215.2 mAh g<sup>-1</sup> (capacity retention of 78%). The results of this study demonstrate that modulation of the electrostatic repulsion and interlayer spacing through the intercalation of organic ligands can enhance the properties of vanadium-based materials.</p>","PeriodicalId":18842,"journal":{"name":"National Science Review","volume":"11 10","pages":"nwae336"},"PeriodicalIF":16.3,"publicationDate":"2024-09-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11487576/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142470291","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"综合性期刊","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Hua-Lu Zhuang, Bowen Cai, Yu Pan, Bin Su, Yilin Jiang, Jun Pei, Fengming Liu, Haihua Hu, Jincheng Yu, Jing-Wei Li, Zhengqin Wang, Zhanran Han, Hezhang Li, Chao Wang, Jing-Feng Li
{"title":"Strong and efficient bismuth telluride-based thermoelectrics for Peltier microcoolers","authors":"Hua-Lu Zhuang, Bowen Cai, Yu Pan, Bin Su, Yilin Jiang, Jun Pei, Fengming Liu, Haihua Hu, Jincheng Yu, Jing-Wei Li, Zhengqin Wang, Zhanran Han, Hezhang Li, Chao Wang, Jing-Feng Li","doi":"10.1093/nsr/nwae329","DOIUrl":"https://doi.org/10.1093/nsr/nwae329","url":null,"abstract":"Thermoelectric Peltier coolers (PCs) are increasingly used as temperature stabilizers for optoelectronic devices. Increasing integration drives PC miniaturization, requiring thermoelectric materials with good strength. We demonstrate a simultaneous gain of thermoelectric and mechanical performance in (Bi, Sb)2Te3, and successfully fabricate micro PCs (2 × 2 mm2 cross-section) that show excellent maximum cooling temperature difference of 89.3 K with a hot-side temperature of 348 K. A multi-step process involving annealing, hot-forging and composition design, is developed to modify the atomic defects and nano- and microstructures. The peak ZT is improved to ∼1.50 at 348 K, and the flexural and compressive strengths are significantly enhanced to ∼140 MPa and ∼224 MPa, respectively. These achievements hold great potential for advancing solid-state refrigeration technology in small spaces.","PeriodicalId":18842,"journal":{"name":"National Science Review","volume":"36 1","pages":""},"PeriodicalIF":20.6,"publicationDate":"2024-09-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142248342","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"综合性期刊","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Ziping Li, Yueyuan Xiao, Chao Jiang, Bang Hou, Yan Liu, Yong Cui
{"title":"Engineering spin-dependent catalysts: chiral covalent organic frameworks with tunable electroactivity for electrochemical oxygen evolution","authors":"Ziping Li, Yueyuan Xiao, Chao Jiang, Bang Hou, Yan Liu, Yong Cui","doi":"10.1093/nsr/nwae332","DOIUrl":"https://doi.org/10.1093/nsr/nwae332","url":null,"abstract":"The chiral-induced spin selectivity (CISS) effect offers promising prospects for spintronics, yet designing chiral materials enabling efficient spin-polarized electron transport remains challenging. Here, we report the utility of covalent organic frameworks (COFs) in manipulating electron spin for spin-dependent catalysis via CISS. This facilitates us to design and synthesize three three-dimensional chiral COFs (CCOFs) with tunable electroactivity and spin-electron conductivity through imine condensations of enantiopure 1,1'-binaphthol-derived tetraaldehyde and tetraamines derived from 1,4-benzenediamine, pyrene, or tetrathiafulvalene skeletons. The CISS effect of CCOFs is verified by magnetic conductive atomic force microscopy. Compared with their achiral analogs, these CCOFs serve as efficient spin filters, reducing the overpotential of oxygen evolution and improving the Tafel slope. Particularly, the diarylamine-based CCOF showed a low overpotential of 430 mV (vs RHE) at 10 mA cm−2 with long-term stability comparable to the commercial RuO2. This enhanced spin-dependent OER activity stems from its excellent redox-activity, good electron conductivity and effective suppressed formation of H2O2 byproducts.","PeriodicalId":18842,"journal":{"name":"National Science Review","volume":"33 1","pages":""},"PeriodicalIF":20.6,"publicationDate":"2024-09-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142248341","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"综合性期刊","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
National Science ReviewPub Date : 2024-09-14eCollection Date: 2024-09-01DOI: 10.1093/nsr/nwae327
Shang-Da Jiang, He Zhu
{"title":"Electron spins from a molecular perspective: an interview with Song Gao.","authors":"Shang-Da Jiang, He Zhu","doi":"10.1093/nsr/nwae327","DOIUrl":"https://doi.org/10.1093/nsr/nwae327","url":null,"abstract":"<p><p>Spin chemistry has emerged as an interdisciplinary field that focuses on electron spins in molecules and related applications in physics, chemistry, biology, materials science and information science. It will play a crucial role in technological innovations. The chemistry of spins is deeply related to the essence of chemical bonds, chemical catalysis, enzyme catalysis, optical and electromagnetic properties, quantum computation and quantum precision measurements. The related research is intersectional, cutting-edge and has a wide range of application prospects. <i>National Science Review</i> (NSR) recently interviewed Prof. Song Gao to discuss spin chemistry. Prof. Gao is a renowned inorganic chemist and an academician of Chinese Academy of Sciences. He is the president of Sun Yat-sen University and the founder of the Spin-X Institute of South China University of Technology. He is recognized as a leader in coordination chemistry and molecular magnetism, and has strong academic influence. Since 2008, he has served on the International Advisory Committee of International Conference on Molecule-Based Magnets, and organized and chaired its 2010 conference. Prof. Gao's primary research topics include molecular nanomagnets; the relationship between geometric structures, electronic structures and magnetism of molecules; and the spin states and reactivity of molecules.</p>","PeriodicalId":18842,"journal":{"name":"National Science Review","volume":"11 9","pages":"nwae327"},"PeriodicalIF":16.3,"publicationDate":"2024-09-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11448471/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142372286","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"综合性期刊","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Targeted imaging of lysosomal zinc ions with a tetrahedral DNA framework fluorescent reporter","authors":"Yue Gao, Xia Liu, Wei Li, Yuncong Chen, Shitai Zhu, Qinglong Yan, Shanshan Geng, Jichao Zhang, Yong Guan, Qian Li, Sisi Jia, Lihua Wang, Jiang Li, Weijiang He, Chunhai Fan, Zijian Guo, Ying Zhu","doi":"10.1093/nsr/nwae307","DOIUrl":"https://doi.org/10.1093/nsr/nwae307","url":null,"abstract":"Abnormal levels of zinc ions within endo-lysosomes have been implicated with the progression of Alzheimer's disease (AD), yet the detection of low-concentration zinc ions at the organelles levels remains challenging. Here we report the design of an endo-lysosome-targeted fluorescent reporter, Znluorly, for imaging endogenous zinc ions. Znluorly is constructed from an amphiphilic DNA framework (DNF) with programmable size and shape, which can encapsulate zinc-responsive fluorophores within its hydrophobic nanocavity. We find that the tetrahedral DNFs of 20-bp in the edge length are effectively located within endo-lysosomes, which can detect zinc ions with a detection limit of ∼31.9 nM, (a sensitivity improvement of ∼2.5 times compared to the free fluorophore). Given the organelle-targeting ability and high zinc sensitivity of Znluorly, we employ it to detect endogenous endo-lysosomal zinc ions in neuron cells. We monitor the dynamics of zinc levels in AD model cells and zebrafish, corroborating the positive correlation between zinc levels and AD hallmarks including Aβ aggregates and learning/memory impairments. Our study provides a generalizable strategy for organelle-specific theranostic applications.","PeriodicalId":18842,"journal":{"name":"National Science Review","volume":"5 1","pages":""},"PeriodicalIF":20.6,"publicationDate":"2024-09-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142248344","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"综合性期刊","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Yuting Liang, Han Hu, Thomas W Crowther, Rainer Georg Jörgensen, Chao Liang, Ji Chen, Yishen Sun, Chaoyang Liu, Jixian Ding, Aidi Huang, Jizhong Zhou, Jiabao Zhang
{"title":"Global decline in microbial-derived carbon stocks with climate warming and its future projections","authors":"Yuting Liang, Han Hu, Thomas W Crowther, Rainer Georg Jörgensen, Chao Liang, Ji Chen, Yishen Sun, Chaoyang Liu, Jixian Ding, Aidi Huang, Jizhong Zhou, Jiabao Zhang","doi":"10.1093/nsr/nwae330","DOIUrl":"https://doi.org/10.1093/nsr/nwae330","url":null,"abstract":"Soil organic carbon (SOC) represents the largest terrestrial pool of organic carbon and is indispensable for mitigating climate change and sustaining soil fertility. As a major component of stable SOC, microbial-derived carbon (MDC) accounts for approximately half of the total SOC and has repercussions on climate feedback. However, our understanding of the spatial and temporal dynamics of MDC stocks is limited, hindering assessments of the long-term impacts of global warming on persistent SOC sequestration in the soil‒atmosphere C cycle. Here, we compiled an extensive global dataset and employed ensemble machine learning techniques to forecast the spatial-temporal dynamics of MDC stocks across 93.4% of the total global land area from 1981 to 2018. Our findings revealed that for every 1°C increase in temperature, there was a global decrease of 6.7 Pg in the soil MDC stock within the predictable areas, equivalent to 1.4% of the total MDC stock or 0.9% of the atmospheric C pool. The tropical regions experienced the most substantial declines in MDC stocks. We further projected future MDC stocks for the next century based on shared socioeconomic pathways, showing a global decline in MDC stocks with a potential 6–37 Pg reduction by 2100 depending on future pathways. We recommend integrating the response of MDC stocks to warming into socioeconomic models to enhance confidence in selecting sustainable pathways.","PeriodicalId":18842,"journal":{"name":"National Science Review","volume":"11 1","pages":""},"PeriodicalIF":20.6,"publicationDate":"2024-09-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142248343","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"综合性期刊","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Baojie Li, Hong Liao, Ke Li, Ye Wang, Lin Zhang, Yixin Guo, Lei Liu, Jingyi Li, Jianbing Jin, Yang Yang, Cheng Gong, Teng Wang, Weishou Shen, Pinya Wang, Ruijun Dang, Kaihua Liao, Qing Zhu, Daniel J Jacob
{"title":"Unlocking nitrogen management potential via large-scale farming for air quality and substantial Co-benefits","authors":"Baojie Li, Hong Liao, Ke Li, Ye Wang, Lin Zhang, Yixin Guo, Lei Liu, Jingyi Li, Jianbing Jin, Yang Yang, Cheng Gong, Teng Wang, Weishou Shen, Pinya Wang, Ruijun Dang, Kaihua Liao, Qing Zhu, Daniel J Jacob","doi":"10.1093/nsr/nwae324","DOIUrl":"https://doi.org/10.1093/nsr/nwae324","url":null,"abstract":"China's sustained air quality improvement is hindered by unregulated ammonia (NH3) emissions from inefficient nitrogen management in smallholder farming. Although the Chinese government is promoting a policy shift to large-scale farming, its benefits when integrated with nitrogen management remain unclear. Here we fill this gap using an integrated assessment by combining geostatistical analysis, high-resolution emission inventories, farm surveys, and air quality modeling. The smallholder-dominated farming allows only 13%–31% NH3 reduction, leading to limited PM2.5 decreases nationally due to nonlinear PM2.5 chemistry. Conversely, large-scale farming would double nitrogen management adoption rates, increasing NH3 reduction potential to 48%–58% and decreasing PM2.5 by 9.4–14.0 μg·m−3 in polluted regions. The estimated PM2.5 reduction is conservative due to localized NH3-rich conditions under large-scale livestock farming. This strategy could prevent over 300 000 premature deaths and achieve a net benefit of ${$}$68.4–86.8 billion annually, unlocking immense benefits for air quality and agricultural sustainability.","PeriodicalId":18842,"journal":{"name":"National Science Review","volume":"36 1","pages":""},"PeriodicalIF":20.6,"publicationDate":"2024-09-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142248345","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"综合性期刊","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Yury A Barbitoff, Darya N Khmelkova, Ekaterina A Pomerantseva, Aleksandr V Slepchenkov, Nikita A Zubashenko, Irina V Mironova, Vladimir S Kaimonov, Dmitrii E Polev, Victoria V Tsay, Andrey S Glotov, Mikhail V Aseev, Sergey G Shcherbak, Oleg S Glotov, Arthur A Isaev, Alexander V Predeus
{"title":"Expanding the Russian allele frequency reference via cross-laboratory data integration: insights from 7,452 exome samples","authors":"Yury A Barbitoff, Darya N Khmelkova, Ekaterina A Pomerantseva, Aleksandr V Slepchenkov, Nikita A Zubashenko, Irina V Mironova, Vladimir S Kaimonov, Dmitrii E Polev, Victoria V Tsay, Andrey S Glotov, Mikhail V Aseev, Sergey G Shcherbak, Oleg S Glotov, Arthur A Isaev, Alexander V Predeus","doi":"10.1093/nsr/nwae326","DOIUrl":"https://doi.org/10.1093/nsr/nwae326","url":null,"abstract":"Population allele frequency is crucially important for accurate interpretation of known and novel variants in medical genetics. Recently, several large allele frequency databases, such as Genome Aggregation Database (gnomAD), have been created to serve as a global reference for such studies. However, frequencies of many rare alleles vary dramatically between populations, and population-specific allele frequency is often more informative than the global one. Many countries and regions, including Russia, remain poorly studied from the genetic perspective. Here, we report the first successful attempt to integrate genetic information between major medical genetic laboratories in Russia. We construct RUSeq, an open, large-scale reference set of genetic variants by analyzing 7 492 exome samples collected in two major Russian cities of Moscow and St. Petersburg. An approximately tenfold increase in sample size compared to previous studies allowed us to characterize extensive genetic diversity within the admixed Russian population with contributions from several major ancestral groups. We highlight 51 known pathogenic variants that are overrepresented in Russia compared to other European countries. We also identify several dozen high-impact variants that are present in healthy donors despite either being annotated as pathogenic in ClinVar and falling within genes associated with autosomal dominant disorders. The constructed database of genetic variant frequencies in Russia has been made available to the medical genetics community through a variant browser available at http://ruseq.ru.","PeriodicalId":18842,"journal":{"name":"National Science Review","volume":"16 1","pages":""},"PeriodicalIF":20.6,"publicationDate":"2024-09-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142248375","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"综合性期刊","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Sub-millikelvin-resolved superconducting nanowire single-photon detector operates with sub-pW infrared radiation power","authors":"Qi Chen, Fei Zhou, Chen Wei, Yue Dai, Haiyong Gan, Labao Zhang, Hao Wang, Hang Yuan, Haochen Li, Jingrou Tan, Guojin Feng, Xuecou Tu, Xiaoqing Jia, Qingyuan Zhao, Lin Kang, Jian Chen, Peiheng Wu","doi":"10.1093/nsr/nwae319","DOIUrl":"https://doi.org/10.1093/nsr/nwae319","url":null,"abstract":"The noise equivalent temperature difference (NETD) indicates the minimum temperature difference resolvable by an infrared detector. The lower the NETD is, the better the sensor can register small temperature differences. In this work, we proposed a strategy to achieve a high temperature resolution using a superconducting nanowire single-photon detector (SNSPD) with ultrahigh sensitivity. We deduced the model for calculating the NETD of a photon-counting type detector and applied it to our SNSPD-based setup. Experimentally, we obtained a NETD as low as 0.65 mK, which is limited by the background radiation of the environment, and the required infrared radiation power is calculated to be less than 1 pW. Furthermore, the intrinsic NETD of this SNSPD is estimated to be less than 0.1 mK. This work demonstrated a sub-mK temperature resolution with the SNSPD, paving the way for future remote infrared thermal imaging with high temperature resolution.","PeriodicalId":18842,"journal":{"name":"National Science Review","volume":"46 1","pages":""},"PeriodicalIF":20.6,"publicationDate":"2024-09-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142248374","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"综合性期刊","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Constructing a supercapacitor-memristor through nonlinear ion transport in MOF nanochannels","authors":"Pei Tang, Pengwei Jing, Zhiyuan Luo, Kekang Liu, Xiaoxi Zhao, Yining Lao, Qianqian Yao, Chuyi Zhong, Qingfeng Fu, Jian Zhu, Yanghui Liu, Qingyun Dou, Xingbin Yan","doi":"10.1093/nsr/nwae322","DOIUrl":"https://doi.org/10.1093/nsr/nwae322","url":null,"abstract":"The coexistence and coupling of capacitive and memristive effects have been an important subject of scientific interest. While the capacitive effect in memristors has been extensively studied, the reciprocal scenario of the memristive effect in capacitors remains unexplored. In this study, we introduce a supercapacitor-memristor (CAPistor) concept, which is constructed by leveraging non-linear ion transport within the pores of a metal-organic framework-zeolitic imidazolate framework (ZIF-7). Within the nanochannels of ZIF-7 electrode in an aqueous pseudocapacitor, the anionic species (OH−) of electrolyte can be enriched and dissipated in different voltage regimes. This difference leads to a hysteresis effect in ion conductivity, constituting a memristive behavior in the pseudocapacitor. Thus, the pseudocapacitor-converted CAPistor seamlessly integrates the programmable resistance and memory functions of an ionic memristor into a supercapacitor, demonstrating enormous potential to extend the traditional energy storage applications of supercapacitors into emerging fields including biomimetic nanofluidic ionics and neuromorphic computing.","PeriodicalId":18842,"journal":{"name":"National Science Review","volume":"75 1","pages":""},"PeriodicalIF":20.6,"publicationDate":"2024-09-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142248376","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"综合性期刊","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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