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A class of irreducible modules for the extended affne Lie algebra ■

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Science China Mathematics 2011年第6期54卷 1089-1099页

作者： ZENG ziting School of Mathematical Science Beijing Normal University Beijing 100875 China

We construct a class of modules for extended affine Lie algebra gl l（Cq） by using the free fields. A necessary and sufficient condition is given for those modules being irreducible.

关键词： extended affine Lie algebra free fields irreducible modules

Geochemical-geomorphological Evidence for the Provenance of Aeolian Sands and Sedimentary Environments in the Hunshandake Sandy Land, Eastern Inner Mongolia, China

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Acta Geologica Sinica(English Edition) 2013年第3期87卷 871-884页

作者： LIU ziting YANG Xiaoping Key Laboratory of Cenozoic Geology and Environment Institute of Geology and Geophysics Chinese Academy of Sciences University of Chinese Academy of Sciences

Identifying the provenance of aeolian sediments in the Hunshandake Sandy Land is of great importance for understanding the formation of the dune fields in the mid-latitudes and for deciphering information about desert＇s responses to global change. By determining the major and trace elements concentrations of aeolian sands in three grain size fractions from the central and western parts of the Hunshandake Sandy Land, we systematically study the provenance and the depositional history of aeolian sands in this desert environment. Our results show that aeolian sands from the Hunshandake Sandy Land are enriched in SiO2 and are depleted in many other elements compared to those of the Upper Continent Crust （UCC）. Variations of the immobile elements ratios like Zr/Hf, La/Yb, Th/Nb, La/Nb, LaN/YbN, GdN/YbN are relatively large in the coarse and medium fractions but minor in the fine fractions. Eu anomalies are quite different in the coarse fractions, but mostly positive in the medium fractions and all negative in the fine fractions. Decreasing tendency of Zr concentrations from the west to the east in the Hunshandake Sandy Land is evident in the coarse sands but rather weak in the fine grain size fractions. Our geochemical data indicate that the sources for the coarse and medium fractions of aeolian sands are diverse, influenced by local geology and geomorphology, while the fine sand fractions are more homogenous due to intensive mixture mainly by aeolian processes. Various ratios of immobile elements suggest that these sands should be sourced primarily from the surrounding mountains by fluvial/alluvial processes rather than from any remote territories. Aeolian sands with Ce negative anomalies are widely distributed in the Hunshandake Sandy Land, indicating that aquatic environments have occurred extensively prior to the occurrence of the dune field.

关键词： sediment provenance trace element major element REE aeolian process geomorphology geochemistry dune

Injectable baicalin/F127 hydrogel with antioxidant activity for enhanced wound healing

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Chinese Chemical Letters 2020年第7期31卷 1817-1821页

作者： Guiting Liu ziting Bao Jun Wu Key Laboratory of Sensing Technology and Biomedical Instrument of Guangdong Province School of Biomedical Engineering.Sun Yat-sen UniversityGuangzhou 510006China Research Institute of Sun Yat-sen University in Shenzhen Shenzhen 518057China

Baicalin,extracted from traditional Chinese medicine Scutellaria baicalensis Georg,possesses multiple pharmacological activities and has great potential for chronic skin wound ***,the poor solubility and lack of suitable vehicles greatly limit its further ***,we proposed a convenient and robust strategy,employing PBS solution as solvent,to enhance the solubility of ***,we constructed injectable baicalin/F127 hydrogels to study their application in skin wound *** composition and temperature sensitivity of baicalin/Pluronic®F-127 hydrogels were confirmed by FTIR and rheological testing,*** vitro release measurement indicated that the first order model was best fitted with the release profile of baicalin from hydrogel ***,MTT assay,AO/EO staining assay as well as hemolytic activity test revealed the excellent cytocompatibility of baicalin/F127 *** activity assay demonstrated the cytoprotective activity of baicalin/F127 hydrogels against reactive oxygen species(ROS).Furthermore,the in vivo experiments exhibited the ability of baicalin/F127 hydrogel to accelerate wound *** conclusion,this novel injectable baicalin/F127 hydrogel should have bright application for chronic wound treatment.

关键词： Wound healing Hydrogel Baicalin Antioxidant Injectable

Molecular mechanisms of Streptococcus pyogenes Cas9:a single-molecule perspective

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Biophysics Reports 2021年第6期7卷 475-489页

作者： Qian Zhang ziting Chen Bo Sun School of Life Science and Technology Shanghai Tech University CAS Center for Excellence in Molecular Cell Science Shanghai Institute of Biochemistry and Cell Biology Chinese Academy of Sciences University of Chinese Academy of Sciences School of Chemistry and Chemical Engineering Frontiers Science Center for Transformative Molecules and National Center for Translational Medicine Shanghai Jiao Tong University Gene Editing Center Shanghai Tech University

Cas9 is an RNA-guided endonuclease from the type II CRISPR-Cas system that employs RNA–DNA base pairing to target and cleave foreign DNA in bacteria. due to its robust and programmable activity, Cas9 has been repurposed as a revolutionary technology for wide-ranging biological and medical applications. A comprehensive understanding of Cas9 mechanisms at the molecular level would aid in its better usage as a genome tool. Over the past few years, single-molecule techniques, such as fluorescence resonance energy transfer, DNA curtains, magnetic tweezers, and optical tweezers, have been extensively applied to characterize the detailed molecular mechanisms of Cas9 proteins. These techniques allow researchers to monitor molecular dynamics and conformational changes, probe essential DNA–protein interactions, detect intermediate states, and distinguish heterogeneity along the reaction pathway, thus providing enriched functional and mechanistic perspectives. This review outlines the single-molecule techniques that have been utilized for the investigation of Cas9 proteins and discusses insights into the mechanisms of the widely used Streptococcus pyogenes(Sp) Cas9 revealed through these techniques.

关键词： Single-molecule Molecular mechanism CRISPR Cas9 Nuclease R-loop

Fluorooxoborates:A precious treasure of deep-ultraviolet nonlinear optical materials

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Chinese Journal of Structural Chemistry 2023年第3期42卷 11-23页

作者： Hongkang Su ziting Yan Xueling Hou Min Zhang Research Center for Crystal Materials CAS Key Laboratory of Functional Materials and Devices for Special EnvironmentsXinjiang Technical Institute of Physics&ChemistryCAS40-1 South Beijing RoadUrumqi830011China Center of Materials Science and Optoeletronics Engineering Univrsty of Chinese Academy of Sciences Beijing 100049China

As the key components of all-solid-state deep-ultraviolet(duV,λ<200 nm)laser sources,exploring duV nonlinear optical(NLO)materials has been a research hotspot for a long ***,as the only material that has been practic... 详细信息

As the key components of all-solid-state deep-ultraviolet(duV,λduV nonlinear optical(NLO)materials has been a research hotspot for a long ***,as the only material that has been practically used to generate duV coherent light through the direct second harmonic generation(SHG)process,KBe_(2)BO_(3)F_(2)(KBBF)still meets bottlenecks,namely,severe layered crystal growth tendency,for extensive *** the search for the next generation of duV NLO materials,fluorooxoborates are highly expected due to their excellent NLO performances,flexible structures,and rich structural *** far,a large number of materials with prominent properties have emerged in the fluorooxoborate *** investigating the differences in structures and properties among fluorooxoborates and borates and borate fluorides,the excellent NLO per-formances of fluorooxoborates are attributed to functionalized B-O/F *** this review,by analyzing the published fluorooxoborates,the fluorooxoborate system is a precious treasure for exploring duV NLO *** synthesis,structures,and properties of some representative fluorooxoborates in the research history are introduced and ***,we put forward the opportunities and challenges of future research in fluorooxoborate duV NLO crystals.

关键词： Fluorooxoborates Deep-ultraviolet(duV) Nonlinear optical crystals Second harmonic generation

In-situ imaging of strain-induced enhancement of hydrogen evolution activity on the extruded MoO_(2)sheets

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Nano Research 2023年第4期16卷 5419-5426页

作者： Mansheng Liao Qiaomei Zhu Shuhua Li Qiongqiong Li ziting Tao Yongchun Fu College of Chemistry and Chemical Engineering Hunan UniversityChangsha 410082China

Strain engineering is a useful strategy for modifying the catalytic activity of ***,in-situ visual characterization of the strain effect on the catalytic activity at nanoscale remains a huge ***,we performed in-situ electrochemical scanning tunneling microscopy(EC-STM)imaging measurements at the local strained regions of extruded singlecrystal molybdenum dioxide(MoO_(2))sheets with combination of current noise analysis(n-EC-STM).The intensity-enhanced noise was observed at the local strained region compared to the unstrained regions in the same frame,which reveals the positive effect of compressive strain on the hydrogen evolution reaction(HER)activity of MoO_(2)provided that the intensity of noise is positively correlated with catalytic HER Faradic ***,we clearly“see”the strain-induced enhancement of HER activity of MoO_(2)at nanoscale by means of noise *** work extends the visual characterization of strain engineering in electrocatalysis and related fields.

关键词： strain engineering visual characterization electrochemical scanning tunneling microscope noise enhancement

Janus hydrogel with dual antibacterial and angiogenesis functions for enhanced diabetic wound healing

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Chinese Chemical Letters 2023年第4期34卷 122-126页

作者： Guiting Liu Yuan Zhou Zejun Xu ziting Bao Li Zheng Jun Wu The State Key Laboratory of Polymer Materials Engineering Polymer Research Institute of Sichuan UniversityChengdu 610065China Guangdong Provincial Key Laboratory of Malignant Tumor Epigenetics and Gene Regulation Sun Yat-sen Memorial Hospital Sun Yat-sen UniversityGuangzhou 510120China School of Biomedical Engineering Sun Yat-sen UniversityGuangzhou 510006China Guangxi Engineering Center in Biomedical Materials for Tissue and Organ Regeneration Life Science InstitutesGuangxi Medical UniversityNanning 530021China Collaborative Innovation Centre of Regenerative Medicine and Medical BioResource Development and Application Co-constructed by the Province and Ministry Guangxi Medical UniversityNanning 530021China

Anti-infection and neovascularization at the wound site are two vital factors that accelerate diabetic wound healing. However, for a wound healing dressing, the two functions need to work at different sites(inner and outer), giving big challenges for dressing design. In this study, we fabricated a novel sodium alginate/chitosan(SA/CS) Janus hydrogel dressing by the assembly of SA hydrogel loaded with silver nanoparticles(Ag NPs) and CS hydrogel impregnated with L-arginine loaded sodium alginate microspheres(Arg MSs) based on electrostatic interactions to combine the two functions. The outer SA-Ag NP hydrogel could prevent infection while avoiding the deposition of Ag NPs in the wound site, and the inner CS-Arg MS hydrogel on the wound surface could realize the sustained release of L-arginine and promote vascular regeneration. The composition, morphology and swelling/degradation of the SA-Ag NP/CS-Arg MS hydrogel were characterized systematically. L-Arginine release behavior has been tested and SA-Ag NP/CSArg MS hydrogel has been confirmed for excellent biocompatibility. Antibacterial and angiogenesis assays demonstrated the antibacterial and angiogenesis characteristics of the SA-Ag NP/CS-Arg MS hydrogel. Finally, in vivo diabetic wound healing assay demonstrated that the SA-Ag NP/CS-Arg MS hydrogel could significantly accelerate re-epithelialization, granulation tissue formation, collagen deposition and angiogenesis, thereby resulting in enhanced diabetic wound healing。

关键词： Janus hydrogel Antibacterial Angiogenesis Diabetic wound Wound healing

Progress on intelligent hydrogels based on RAFT polymerization:Design strategy, fabrication and the applications for controlled drug delivery

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Chinese Chemical Letters 2020年第1期31卷 19-27页

作者： Caihong Xian Qijuan Yuan ziting Bao Guiting Liu Jun Wu Key Laboratory of Sensing Technology and Biomedical Instrument of Guangdong Province School of Biomedical EngineeringSun Yat-sen UniversityGuangzhou 510006China Research Institute of Sun Yat-Sen University in Shenzhen Shenzhen 518057China

Although intelligent hydrogels have shown bright potential application in biomedical fields,they were prepared by conventional methods and still face many serious challenges,such as uncontrollable stimulus-response and low response ***,RAFT polymerization provides a versatile strategy for the fabrication of intelligent hydrogels with improved stimulus-response properties,owing to the ability to efficiently construct hydrogel precursors with well-defined structure,such as block copolymer,graft copolymer,star *** this review,we summarized the recent progress on intelligent hydrogels based on RAFT polymerization with emphasis on their fabrication strategies and applications for controlled drug delivery.

关键词： timulus-responsive Hydrogel RAFT polymerization Drug controlled release Rapid response

Spatial light modulation for femtosecond laser manufacturing:Current developments and challenges

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Science China(Technological Sciences) 2024年第1期67卷 60-72页

作者： ZANG Xue LIU ziting XU YiShi WANG Yi WANG Qing LI ZhenZe WANG Lei State Key Laboratory of Integrated Optoelectronics College of Electronic Science and EngineeringJilin UniversityChangchun 130012China State Key Laboratory of Precision Measurement and Instruments Department of Precision InstrumentTsinghua UniversityBeijing 100084China

Since the invention of lasers,spatial-light-modulated laser processing has become a powerful tool for various *** enables multidimensional and dynamic modulation of the laser beam,which significantly improves the processing efficiency,accuracy,and flexibility,and presents wider prospects over traditional mechanical technologies for machining three-dimensional,hard,brittle,or transparent *** this review,we introduce:(1)The role of spatial light modulation technology in the development of femtosecond laser manufacturing;(2)the structured light generated by spatial light modulation and its generation methods;and(3)representative applications of spatial-light-modulated femtosecond laser manufacturing,including aberration correction,parallel processing,focal field engineering,and polarization ***,we summarize the present challenges in the field and possible future research.

关键词： femtosecond laser manufacturing spatial light modulation structured light aberration correction parallel processing focal field engineering polarization control