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15篇 您的检索式:作者名="LIU XiaoChi"
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1Highly fractionated granites:Recognition and research显示文摘Granite is one of the most important components of the continental crust on our Earth; it thus has been an enduring studied subject in geology. According to present knowledge, granite shows a great deal of heterogeneity in terms of its texture,structure, mineral species and geochemical compositions at different scales from small dike to large batholith. However, the reasons for these variations are not well understood although numerous interpretations have been proposed. The key point of this debate is whether granitic magma can be effectively differentiated through fractional crystallization, and, if so, what kind of crystallization occurred during the magmatic evolution. Although granitic magma has high viscosity because of its elevated SiO2 content, we agree that fractional crystallization is effectively processed during its evolution based on the evidence from field investigation,mineral species and its chemical variations, and geochemical compositions. These data indicate that crystal settling by gravitation is not the only mechanism dominating granitic differentiation. On the contrary, flow segregation or dynamic sorting may be more important. Accordingly, granite can be divided into unfractionated, fractionated(including weakly fractionated and highly fractionated) and cumulated types, according to the differentiation degree. Highly fractionated granitic magmas are generally high in primary temperature or high with various volatiles during the later stage, which make the fractional crystallization much easier than the common granitic melts. In addition, effective magmatic differentiation can be also expected when the magma emplaced along a large scale of extensional structure. Highly fractionated granitic magma is easily contaminated by country rocks due to its relatively prolonged crystallization time. Thus, granites do not always reflect the characteristics of the source areas and the physical and chemical conditions of the primary magma. We proposed that highly fractionated granites are an important sign indicating compositional maturity of the continental crust, and they are also closely related to the rare-elemental(metal) mineralization of W,Sn, Nb, Ta, Li, Be, Rb, Cs, REEs, etc.WU FuYuan LIU XiaoChi JI WeiQiang WANG JiaMin YANG Lei 2017Science China Earth Sciences2017,60,7:109
2A preliminary study of rare-metal mineralization in the Himalayan leucogranite belts, South Tibet显示文摘The Himalayan leucogranite occurs as two extensive(>1000 km) E-W trending belts on the Tibetan Plateau with the unique features. The leucogranite comprised biotite granite, two-mica/muscovite granite, tourmaline granite and garnet granite, which have been identified in previous studies, as well as albite granite and granitic pegmatite that were identified in this investigation. Fifteen leucogranite plutons were studied and 12 were found to contain rare-metal bearing minerals such as beryl(the representative of Be mineralization), columbite-group minerals, tapiolite, pyrochlore-microlite, fergusonite, Nb-Ta rutile(the representative of Nb-Ta mineralization), and cassiterite(the representative of Sn mineralization) mainly based on the field trip,microscope observation and microprobe analysis. The preliminary result shows that the Himalayan leucogranite is commonly related to the rare-metal mineralization and warrants future investigation. Further exploration and intensive research work is important in determining the rare-metal resource potential of this area.WANG RuCheng WU FuYuan XIE Lei LIU XiaoChi WANG JiaMin YANG Lei LAI Wen LIU Chen 2017Science China Earth Sciences2017,60,9:45
3Paleoproterozoic mafic dyke from Kongling terrain in the Yangtze Craton and its implication显示文摘Mafic dyke is a sign of regional extension, and thus has important tectonic significance. A great amount of mafic dykes occur in the Kongling terrain of the Yangtze Craton, which have great bearing on the early evolution of the Yangtze Craton. Their ages, however, have not been well constrained. In this paper we report an integrated study of zircon U-Pb age and Hf isotope compositions for a mafic dyke in the Kongling terrain. The zircons yielded a weighted mean 207Pb/206Pb age of 1852±11Ma, which represents its intrusion age. They have εHf(t) values of -6.3 to 0.5, with a weighted mean of -3.06±0.88, suggesting that the mafic dyke came from metasomatic mantle. The results indicate that the Yangtze Block had transformed into post-collisional extensional regime at ca. 1850 Ma. In the same period, the Yangtze Craton shows enough rigidity to produce brittle rupture, and thus has the characteristics of a craton.PENG Min WU YuanBao WANG Jing JIAO WenFang LIU XiaoChi YANG SaiHong 2009Chinese Science Bulletin2009,54,6:10
4Cilastatin protects against imipenem-induced nephrotoxicity via inhibition of renal organic anion transporters(OATs)显示文摘Imipenem is a carbapenem antibiotic. However, Imipenem could not be marketed owing to its instability and nephrotoxicity until cilastatin, an inhibitor of renal dehydropeptidase-I(DHP-I),was developed. In present study, the potential roles of renal organic anion transporters(OATs) in alleviating the nephrotoxicity of imipenem by cilastatin were investigated in vitro and in rabbits. Our results indicated that imipenem and cilastatin were substrates of h OAT1 and h OAT3. Cilastatin inhibited h OAT1/3-mediated transport of imipenem with IC50 values comparable to the clinical concentration, suggesting the potential to cause a clinical drug–drug interaction(DDI). Moreover,imipenem exhibited h OAT1/3-dependent cytotoxicity, which was alleviated by cilastatin and probenecid. Furthermore, cilastatin and probenecid ameliorated imipenem-induced rabbit acute kidney injury, and reduced the renal secretion of imipenem. Cilastatin and probenecid inhibited intracellular accumulation of imipenem and sequentially decreased the nephrocyte toxicity in rabbit primary proximal tubule cells. Renal OATs, besides DHP-I, was also the target of interaction between imipenem and cilastatin, and contributed to the nephrotoxicity of imipenem. This therefore gives in part the explanation about the mechanism by which cilastatin protected against imipenem-induced nephrotoxicity. Thus, OATs can potentially be used as a therapeutic target to avoid the renal adverse reaction of imipenem in clinic.Xiaokui Huo Qiang Meng Changyuan Wang Yanna Zhu Zhihao Liu Xiaodong Ma Xiaochi Ma Jinyong Peng Huijun Sun Kexin Liu 2019Acta Pharmaceutica Sinica B2019,9,5:5
5Correlation analysis between the chemical contents and bioactivity for the quality control of Alismatis Rhizoma显示文摘In order to clarify regions of production and to discriminate processing methods, quantitative and qualitative analyses for saccharides and terpenes in 35 batches of Alismatis Rhizoma were performed.Methodologies included HPLC–PDA, HPLC–VWD and UHPLC–MSn, combined with principal component analysis(PCA) and partial least squares regression techniques(PLSR). The inhibitory effects of triterpenes and Alismatis Rhizoma extracts on lipase activity were evaluated in vitro. PLSR analysis revealed significant positive correlations(R2= 0.5795) between the contents of triterpenes 10, 14, 15, 18 and 22 and the inhibitory effects of Alismatis Rhizoma. The present study establishes an effective method for simultaneous determination of multiple components, and identifies key bioactive triterpenes. These results can be used for systematic and novel analytical strategies for the quality control of Alismatis Rhizoma production.Xiaoxv Gao Chengpeng Sun Zhenglong Yu Jian Cang Xiangge Tian Xiaokui Huo Lei Feng Xinguang Liu Chao Wang Baojing Zhang Xiaochi Ma 2018Acta Pharmaceutica Sinica B2018,8,2:4
6Cesium-rubidium mineralization in Himalayan leucogranites显示文摘This paper presents a study of a newly discovered pollucite-lepidolite-albite granite(PLAG)in the Himalayan leucogranite belt,which marks the first occurrence of pollucite,a major cesium silicate mineral,in the Himalayan orogenic belt(China).The rock appears at the northern part of the Gyirong pluton,coexisting with the tourmaline-bearing two-mica granite(TMG).Primary rare-metal minerals include lepidolite(Li),spodumene(Li),pollucite(Cs),cassiterite(Sn),and microlite(Ta).Micas,mainly lithian muscovite to lepidolite,contain 4.07 wt.%Li_2O and 0.76 wt.%Rb_2O on average.The average Li_2O content of the spodumene is 7.95 wt.%.Pollucite not only has an average Cs_2O content of 34 wt.%,but also has an elevated Rb_2O content of about 0.16 wt.%.Notably,this granite attains industrial grades for rare metals,specifically with Li_2O,Rb_2O,and Cs_2O contents of 0.49–1.19 wt.%,0.12–0.24 wt.%,and 0.69–2.33 wt.%,respectively.Dating results of magmatic accessory cassiterite and monazite indicated that the PLAG was formed at 19–18 Ma,slightly later than the TMG(22–20 Ma)of the Gyirong pluton.Thus,these two types of granites may form within the same magmatic system considering their pulsating intrusive contact,formation ages,and whole-rock and mineral chemical compositions.Furthermore,the abundant presence of pollucite suggests that the PLAG experienced high degrees of magmatic fractionation.In comparison to the Pusila spodumene pegmatite in the Himalaya and the Yashan topaz-lepidolite granite in Jiangxi,South China,the Gyirong PLAG exhibits different whole-rock and mineral compositions,resulting from differences in source materials and fractionation processes.Notably,the difference in fluorine(F)content may determine the degree of rare-metal element enrichment.The discovery of Gyirong PLAG highlights multiple stages and types of rare-metal mineralization in the Himalayan leucogranite belt,which is controlled by the South Tibetan Detachment System.The Cs-bearing geyserite deposit exposed along the Yarlung-Zangbo River,together with Himalayan leucogranites,constitutes two systems of rare-metal elements migration and enrichment.These two systems reflect the interaction among Earth systems across time and space,emphasizing how the Himalayan orogeny controls mineralization.As a result,the Himalayan leucogranite belt has considerable prospecting potential for cesium and rubidium resources and may be a crucial area for future exploration and resource utilization.Fangyang HU Xiaochi LIU Shaoxiong HE Jiamin WANG Fuyuan WU 2023Science China Earth Sciences2023,66,12:3
7Insights into the origin of purely sediment-derived Himalayan leucogranites:Si-O isotopic constraints显示文摘Granite is the dominant rock type in Earth’s continental crust.The origin of granite can be directly or indirectly related to the fractional crystallization of mantle-derived basaltic melt or the reworking of pre-existing continental or oceanic crust, which contribute to the growth of continental crust. Among the various types of granites, the peraluminous leucogranites in the Himalayan orogen, which are high in SiO_2(>73%) and low in mafic minerals (<5%),Xiaochi Liu Xianhua Li Yu Liu Lei Yang Qiuli Li Fuyuan Wu Huimin Yu Fang Huang 2018Science Bulletin2018,63,19:3
8Soil Respiration and Litter Decomposition Increased Following Perennial Forb Invasion into an Annual Grassland显示文摘Exotic plant invasions may alter ecosystem carbon processes, especially when native plants are displaced by plants of a different functional group. Forb invasions into grasslands are common, yet little is known about how they impact carbon cycling. We conducted a field study over 2 years from April 2010 to March 2012 in China to examine changes in soil respiration(R_(soil)) following invasion of exotic perennial forb species(Alternanthera philoxeroides or Solidago canadensis) into an annual grassland dominated by a native annual graminoid(Eragrostis pilosa). Measurements of R_(soil)were taken once a week in stands of the native annual graminoid or one of the forb species using static chamber-gas chromatograph method. Aboveground litterfall of each of the three focal species was collected biweekly and litter decomposition rates were measured in a 6-month litterbag experiment. The monthly average and annual cumulative R_(soil)increased following invasion by either forb species. The increases in cumulative R_(soil)were smaller with invasion of Solidago(36%)than Alternanthera(65%). Both invasive forbs were associated with higher litter quantity and quality(e.g., C:N ratio) than the native annual graminoid. Compared to the native annual graminoid, the invasive forbs Alternanthera(155%) and Solidago(361%) produced larger amounts of more rapidly decomposing litter, with the litter decay constant k being 3.8, 2.0 and 1.0 for Alternanthera, Solidago and Eragrostis, respectively. Functional groups of the invasive plants and the native plants they replaced appear to be useful predictors of directions of changes in R_(soil), but the magnitude of changes in R_(soil)seems to be sensitive to variations in invader functional traits.ZHANG Ling MA Xiaochi WANG Hong LIU Shuwei Evan SIEMANN ZOU Jianwen 2016Pedosphere2016,26,4:2
9Dual-periodic-microstructure-induced color tunable white organic Ught-emitting devices显示文摘Yangang BI Jinhai JI Yang CHEN Yushan LIU Xulin ZHANG Yunfei LI Ming XU Yuefeng LIU Xiaochi HAN Qiang GAO Hongbo SUN 2016Frontiers of Optoelectronics2016,9,2:2
10Oxidations of two-dimensional semiconductors:Fundamentals and applications显示文摘Since the discovery of graphene,two-dimensional(2D)semiconductors have been attracted intensive interest due to their unique properties.They have exhibited potential applications in next generation electronic and optoelectronic devices.However,most of the 2D semiconductor are known to suffer from the ambient oxidation which degrade the materials and therefore hinder us from the intrinsic materials’properties and the optimized performance of devices.In this review,we summarize the recent progress on both fundamentals and applications of the oxidations of 2D semiconductors.We begin with the oxidation mechanisms in black phosphorus,transition metal dichalcogenides and transition metal monochalcogenides considering the factors such as oxygen,water,and light.Then we show the commonly employed passivation techniques.In the end,the emerging applications utilizing controlled oxidations will be introduced.Junqiang Yang Xiaochi Liu Qianli Dong Yaqi Shen Yuchuan Pan Zhongwang Wang Kui Tang Xianfu Dai Rongqi Wu Yuanyuan Jin Wei Zhou Song Liu Jian Sun 2022Chinese Chemical Letters2022,33,1:0
11Correction: Characterization of a small-molecule inhibitor targeting NEMO/IKKβ to suppress colorectal lcancergrowth显示文摘In the process of collating the raw data,the authors noticed an inadvertent mistake occurred in Fig.3b that needs to be corrected after online publication of the article.In Fig.3b,as a result of an error in the graphics panel arrangement process,the band of NEMO was repeatedly inserted asβ-actin by mistake.The correct band is shown as below and in the updated Fig.3b.The correction did not affect any of our results or discussion as present in the original publication.We regret any inconvenience this has caused.Zhenlong Yu Jian Gao Xiaolei Zhang Yulin Peng Wenlong Wei Jianrong Xu Zhenwei Li Chao Wang Meirong Zhou Xiangge Tian Lei Feng Xiaokui Huo Min Liu Mingliang Ye De-an Guo Xiaochi Ma 2023Signal Transduction and Targeted Therapy2023,8,10:0
12Van der Waals ferroelectric transistors:the all-round artificial synapses for high-precision neuromorphic computing显示文摘State number,operation power,dynamic range and conductance weight update linearity are key synaptic device performance metrics for high-accuracy and low-power-consumption neuromorphic com-puting in hardware.However,high linearity and low power consump-tion couldn’t be simultaneously achieved by most of the reported synaptic devices,which limits the performance of the hardware.This work demonstrates van der Waals(vdW)stacked ferroelectric field-effect transistors(FeFET)with single-crystalline ferroelectric nanoflakes.Ferroelectrics are of fine vdW interface and partial polar-ization switching of multi-domains under electric field pulses,which makes the FeFETs exhibit multi-state memory characteristics and ex-cellent synaptic plasticity.They also exhibit a desired linear conduc-tance weight update with 128 conductance states,a sufficiently high dynamic range of G_(max)/G_(min)>120,and a low power consumption of 10 fJ/spike using identical pulses.Based on such an all-round device,a two-layer artificial neural network was built to conduct Modified Na-tional Institute of Standards and Technology(MNIST)digital num-bers and electrocardiogram(ECG)pattern-recognition simulations,with the high accuracies reaching 97.6%and 92.4%,respectively.The remarkable performance demonstrates that vdW-FeFET is of obvious advantages in high-precision neuromorphic computing applications.Zhongwang Wang Xuefan Zhou Xiaochi Liu Aocheng Qiu Caifang Gao Yahua Yuan Yumei Jing Dou Zhang Wenwu Li Hang Luo Junhao Chu Jian Sun 2023Chip2023,2,2:0
13Characterization of a small-molecule inhibitor targeting NEMO/IKKβto suppress colorectal cancer growth显示文摘NEMO/IKKβcomplex is a central regulator of NF-κB signaling pathway,its dissociation has been considered to be an attractive therapeutic target.Herein,using a combined strategy of molecular pharmacological phenotyping,proteomics and bioinformatics analysis,Shikonin(SHK)is identified as a potential inhibitor of the IKKβ/NEMO complex.It destabilizes IKKβ/NEMO complex with IC_(50) of 174 nM,thereby significantly impairing the proliferation of colorectal cancer cells by suppressing the NF-κB pathway in vitro and in vivo.In addition,we also elucidated the potential target sites of SHK in the NEMO/IKKβcomplex.Our study provides some new insights for the development of potent small-molecule PPI inhibitors.Zhenlong Yu Jian Gao Xiaolei Zhang Yulin Peng Wenlong Wei Jianrong Xu Zhenwei Li Chao Wang Meirong Zhou Xiangge Tian Lei Feng Xiaokui Huo Min Liu Mingliang Ye De-an Guo Xiaochi Ma 2022Signal Transduction and Targeted Therapy2022,7,4:0
14Zircon Record of Ocean-Continent Subduction Transition Process of Dulan UHPM Belt, North Qaidam显示文摘The North Qaidam UHPM(ultra-high pressure metamorphism) belt is a typical continental subduction-collision belt containing continental crust deep subduction metamorphic products and oceanic crust relics, And it is an ideal region to study the ocean-continent transition and exhumation mechanism of oceanic UHP rocks during continental deep subduction process. In this paper, we report integrated in situ U-Pb, Lu-Hf and O isotope analyses of zircons from a serpentinized harzburgite as well as U-Pb dating for zircons from a kyanite eclogite from the North Qaidam Dulan UHPM terrane, and use these data to discuss the ocean-continent transition and exhumation mechanisms of oceanic UHP rocks during continental deep subduction. The serpentinized harzburgite was dated at 448±9 Ma, consistent with 455±5 Ma age for the kyanite eclogite within analytical errors. Zircons from the serpentinized harzburgite have uniform 176Hf/177 Hf values ranging from 0.282 842 to 0.282 883 and εHf(t) values from 11.6 to 13.3. Zircon δ18O values of the serpentinized harzburgite vary from 4.47‰ to 5.29‰, slightly lower than the value of 5.3‰±0.6‰ for the normal mantle zircon. These Hf-O isotopic features indicate that the protolith of the serpentinized harzburgite was derived from depleted-mantle source, and might have experienced high-temperature rock-water interaction. Therefore, the serpentinized harzburgite was possibly located in the lower part of an oceanic section. The serpentinized harzburgite and kyanite eclogite were both formed due to the subduction of oceanic crust. The UHP metamorphism occurred successively from the oceanic crust to continental crust rocks of the North Qaidam UHP terrane. Low-density serpentinized peridotite and continental rocks possibly have negative buoyancy and play a key effect on preservation and exhumation of high-density oceanic eclogite.Jianzhou Yang Xiaochi Liu Yuanbao Wu Yanling Sun 2015Journal of Earth Science2015,26,5:0
15β-decay study of neutron-rich nucleus ^(34)Al显示文摘The'island of inversion'has been known for over a quarter century,since Warburton et al.[1]proposed that nuclei with intruder ground states would constitute a 3×3 square with Z=10-12,N=20-22 in 1990.Uncovering the underlying inversion mechanism and exploring the scope of the island have attracted significant theoretical and experimental efforts in the following years.Now it is well known that the reduction of N=20 shell gap,which is likely caused by theRui Han XiangQing Li WeiGuang Jiang ZhiHuan Li Hui Hua ShuangQuan Zhang CenXi Yuan DongXing Jiang YanLin Ye Jing Li ZongHao Li FuRong Xu QiBo Chen Jie Meng JianSong Wang Chuan Xu YeLei Sun ChunGuang Wang HongYi Wu ChenYang Niu ChenGuang Li Chao He Wei Jiang PengJie Li HongLiang Zang Jun Feng SiDong Chen Qiang Liu XiaoChi Chen HuShan Xu ZhengGuo Hu YanYun Yang Peng Ma JunBing Ma ShiLun Jin Zhen Bai MeiRong Huang Yuan Jie Zhou WeiHu Ma Yong Li XiaoHong Zhou YuHu Zhang GuoQing Xiao WenLong Zhan 2017Science China(Physics,Mechanics & Astronomy)2017,60,4:0
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