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The electromagnetically induced transparency in the Y-type four-level atom system at low light levels

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Science China(Physics,Mechanics & Astronomy) 2005年第5期48卷 593-599页

作者： ZHANG liying liu Zhengdong chen Jun Institute of Modern Physics Nanchang University Nanchang 330047 China Institute of Modern Physics Nanchang University Nanchang 330047 China Institute of Modern Physics Nanchang University Nanchang 330047 China

In this paper a Y-type four-level atom interacting with external fields system is investigated. It is shown that increasing the control field can reduce the probe absorption, the electromagnetically induced transparency (EIT) and gain can be obtained if the parameters are taken appropriately. An interesting phenomenon is found that the system appears to be probe gain in a large region if the external fields Rabi phases are taken appropriately, too.

关键词： quantum optics, the nonlinear effect at low light levels, EIT, spontaneous emission, quantum interference.

Transcriptome Analyses Implicate Endogenous Retroviruses Involved in the Host Antiviral Immune System through the Interferon Pathway

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Virologica Sinica 2021年第6期36卷 1315-1326页

作者： Miao Wang liying Wang Haizhou liu Jianjun chen Di liu CAS Key Laboratory of Special Pathogens and Biosafety Wuhan Institute of VirologyChinese Academy of SciencesWuhan 430071China Computational Virology Group Center for Bacteria and Viruses Resources and BioinformationWuhan Institute of VirologyChinese Academy of SciencesWuhan 430071China University of Chinese Academy of Sciences Beijing 100049China First Affiliated Hospital of Xinjiang Medical University Urumqi 830054China

Human endogenous retroviruses(HERVs) are the remains of ancient retroviruses that invaded our ancestors’ germline cell and were integrated into the genome. The expression of HERVs has always been a cause for concern because of its association with various cancers and diseases. However, few previous studies have focused on specific activation of HERVs by viral infections. Our previous study has shown that dengue virus type 2(DENV-2) infection induces the transcription of a large number of abnormal HERVs loci;therefore, the purpose of this study was to explore the relationship between exogenous viral infection and HERV activation further. In this study, we retrieved and reanalyzed published data on 21 transcriptomes of human cells infected with various viruses. We found that infection with different viruses could induce transcriptional activation of HERV loci. Through the comparative analysis of all viral datasets, we identified 43 key HERV loci that were up-regulated by DENV-2, influenza A virus, influenza B virus, Zika virus, measles virus, and West Nile virus infections. Furthermore, the neighboring genes of these HERVs were simultaneously up-regulated, and almost all such neighboring genes were interferon-stimulated genes(ISGs), which are enriched in the host’s antiviral immune response pathways. Our data supported the hypothesis that activation of HERVs, probably via an interferon-mediated mechanism, plays an important role in innate immunity against viral infections.

关键词： Human endogenous retrovirus(HERV) RNA-seq Virus infection Interferon-stimulated genes(ISGs)

Silver nanoparticles embedded temperature-sensitive nanofibrous membrane as a smart free-standing SERS substrate

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Chinese Chemical Letters 2019年第12期30卷 2021-2026页

作者： Xiaoyun liu liying Wang Siyuan chen liusheng Zha Research Center for Analysis and Measurement Donghua UniversityShanghai 201620China State Key Laboratory for Modification of Chemical Fibers and Polymer Materials&College of Materials Science and Engineering Donghua UniversityShanghai 201620China

To develop a smart free-standing surface enhanced Raman scattering(SERS) substrate,silver nanoparticles(AgNPs) embedded temperature-sensitive nanofibrous membrane was fabricated by electrospinning their aqueous solution containing the copolymer poly(N-isopropylacrylamide-co-Nhydroxymethylacrylamide),followed by heat treatment to form crosslinking structure within its constituent *** avoid negative effect of the additive like stabilizer and the reactant like reductant on their SERS efficiency,the AgNPs were in-situ synthesized through reducing Ag^+ions dissolved in the polymer solution by ultraviolet *** prepared hybrid nanofibrous membrane with high stability in aqueous medium can reach its swelling or deswelling equilibrium state within 15 seconds with the medium temperature changing between 25℃and 50℃*** it was used as a free-standing SERS substrate,10^-12 mol/L of 4-nitrothiophenol in aqueous solution can be detected at room temperature,and elevating detection temperature can further lower its low detection *** its generated SERS signal has desirable reproducibility,it can be used as SERS substrate for quantitative ***,the hybrid membrane as SERS substrate is capable of real-time monitoring the reduction of 4-nitrothiophenol into 4-aminothiophenol catalyzed by its embedded AgNPs,and the detected intermediate indicates that the reaction proceeds via a condensation route.

关键词： Nanofibrous membrane Silver nanoparticles Electrospinning Temperature-sensitiveness SERS substrate

Ion-induced white-light-emitting polymeric hydrogels with high mechanical strength and reversible stimuli-responsive properties

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Chinese Chemical Letters 2021年第10期32卷 3133-3136页

作者： Shanshan chen liying Yin Lin liu Ning Zhang Dewen Dong CAS Key Laboratory of High-Performance Synthetic Rubber and its Composite Materials Changchun Institute of Applied ChemistryChinese Academy of SciencesChangchun 130022China University of Science and Technology of China Hefei 230026China Department of Chemistry Northeast Normal UniversityChangchun 130024China

We have developed a facile strategy to fabricate model multicolor hydrogels via a straightforward mixing process of poly acrylonitrile-grafted methacrylamide(PANMAM),polymethacrylic acid(PMAA)and doped lanthanide(Eu/Tb)and zinc ions to form the interpenetrating dual-polymer gel *** hydrogels exhibit excellent tunability of multi-spectrum emission colors(including white light)by simply varying the stoichiometry of metal ***,taking the advantage of different metal ion response mechanisms,we have demonstrated the reversible acidity/alkalinity stimuli-responsive behaviors of white-light-emitting hydrogel(WLE gel).Meanwhile,the unique cross-linked network formed through hydrogen-bonding,metal-ligand coordination and ionic interaction is introduced to achieve favorable mechanical strength of *** properties enable the possibility in obtaining fluorescent patterns on hydrogels,which are promising candidate for encrypted information with improved security.

关键词： Polymeric hydrogel Tunable fluorescence White-light-emitting Metal-coordination Pattern

Integration of LNG Regasification Process in Natural Gas-Fired Power System with Oxy-Fuel Combustion

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Journal of Thermal Science 2022年第5期31卷 1351-1366页

作者： liu Rong XIONG Yongqiang KE liying LIANG Jiacheng chen Dengjie ZHAO Zhongxing LI Yajun College of Chemistry and Materials Science Ji’nan UniversityGuangzhou510632China Guangxi Key Laboratory of Petrochemical Resource Processing and Process Intensification Technology Guangxi UniversityNanning530004China Key Lab of Heat Transfer Enhancement and Energy Conservation of the Ministry of Education South China University of TechnologyGuangzhou510640China

Oxy-fuel combustion power systems can utilize the cold energy released during the liquefied natural gas(LNG)regasification to reduce the power consumption of CO_(2) capture,but the specific LNG cold energy consumption of CO_(2) capture is still too *** recover more CO_(2) with the limited LNG cold energy at a low energy cost,a novel natural gas-fired oxy-fuel power system with the cascade utilization of LNG cold energy is proposed in this work,where the LNG cold energy could be sequentially utilized in the air separation unit and the CO_(2) recovery *** new system is evaluated with the Aspen Plus *** results show that the net electrical efficiency and the specific primary energy consumption for CO_(2) avoided(SPECCA)of the new system are comparable to those of the chemical looping combustion cycle,and superior to those of the conventional O_(2)/CO_(2) ***,the specific LNG needed for CO_(2) avoided(SLNCC)of the new system is more than 67.2%lower than the existing oxy-fuel power systems utilizing the LNG cold ***,it is found that the O_(2) purity of 97.0 mol.%and the CO_(2) capture ratio of 97.0%are optimal conditions,because the SPECCA,the specific exergy consumption for CO_(2) avoided(SECCA)and the SLNCC are at the minimum of 1.87 GJLHV⋅t_(CO_(2))^(−1),2.60GJ⋅t_(CO_(2))^(−1) and 1.88tLNG⋅t_(CO_(2))^(−1),***,the net electrical efficiency and the exergy efficiency of the new system reach 51.51%and 49.23%,respectively.

关键词： oxy-fuel combustion CO_(2)capture LNG cold energy efficiency

Site-specific protein modification by genetic encoded disulfide compatible thiols

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Chinese Chemical Letters 2020年第1期31卷 163-166页

作者： Xinyu Ling Heqi chen Wei Zheng liying Chang Yong Wang Tao liu State Key Laboratory of Natural and Biomimetic Drugs School of Pharmaceutical SciencesPeking University

Cysteine chemistry provides a low cost and convenient way for site-specific protein ***,recombinant expression of disulfide bonding containing protein with unpaired cysteine is technically challenging and the resulting protein often suffers from significantly reduced yield and *** we used genetic code expansion technique to introduce a surface exposed self-paired dithiol functional group into proteins,which can be selectively reduced to afford active *** compounds containing self-paired disulfides were synthesized,and their genetic incorporations were validated using green fluorescent proteins(GFP).The compatibility of these self-paired di-thiols with natural disulfide bond was demonstrated using antibody fragment to afford site-specifically labeled *** work provides another valuable building block into the chemical tool-box for site-specific labeling of proteins containing internal disulfides.

关键词： Cysteine chemistry Genetic code expansion Protein modification Biorthogonal chemistry Disulfide bond

UiO-66 type metal-organic framework as a multifunctional additive to enhance the interfacial stability of Ni-rich layered cathode material

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Journal of Energy Chemistry 2020年第11期29卷 378-386页

作者： Ruixue Xue Na liu liying Bao Lai chen Yuefeng Su Yun Lu Jinyang Dong Shi chen Feng Wu Beijing Key Laboratory of Environmental Science and Engineering School of Materials Science and EngineeringBeijing Institute of TechnologyBeijing 100081China Beijing Institute of Technology Chongqing Innovation Center Chongqing 401120China

To effectively alleviate the surface structure degradation caused by electrolyte corrosion and transition metal(TM) dissolution for Ni-rich(Ni content > 0.6) cathode materials, porous Zirconium based metalorganic frameworks(Zr-MOFs, UiO-66) material is utilized herein as a positive electrode additive. UiO-66 owns tunable attachment sites and strong binding affinity, making itself an efficient defluorination agent to suppress the undesirable reactions caused by fluorine species. Besides, it can also relieve TMs dissolution and block the migration of TMs toward anode side since it’s a multifarious metal ions adsorbent,realizing both cathode and anode interface protection. Benefiting from these advantages, the UiO-66 assistant Ni-rich cathode achieves superior cycling stability. Particularly in full cell, the positive effects of this multifunctional additive are more pronounced than in the half-cell, that is after 400 cycles at 2 C,the capacity retention has doubled with the addition of UiO-66. More broadly, this unique application of functional additive provides new insight into the degradation mechanism of layered cathode materials and offers a new avenue to develop high-energy density batteries.

关键词： Ni-rich layered cathode Metal-organic framework additive Electrolyte corrosion Transition metal dissolution Interfacial stability

Liquid Metal Transformable Machines

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Accounts of Materials Research 2021年第12期2卷 1227-1238页

作者： hongzhang Wang Sen chen Bo Yuan Jing liu Xuyang Sun Department of Biomedical Engineering School of MedicineTsinghua UniversityBeijing 100084China Beijing Key Lab of Cryobiomedical Engineering and Key Lab of Cryogenics Technical Institute of Physics and ChemistryChinese Academy of SciencesBeijing 100190China School of Medical Science and Engineering Beihang UniversityBeijing 100191China

CONSPECTUS:Conventional robots can accomplish defined tasks but often encounter troubles when handling irregular objects under unstructured *** robots,with supercompliance,large transformation,and high environmental adaptability,hold big promise for delicate manipulations such as grasping soft objects or delivering precious biomedical *** a step further,if soft robots are endowed with the extraordinary behaviors to freely transform among different morphologies and constructions just like those already existing in literature and science fiction films,more fantastic challenges can be *** one of the most potential robotic soft materials,liquid metals have been given sufficient expectations on realizing the transformable machines that might fundamentally reform modern daily ***,inspiring discoveries on controllable transformations of the liquid metal have been obtained surprisingly and tremendous efforts have been made over the past decade,indicating a significant step toward such a formidable *** is clear that the discovery of liquid metal-based largescaled transformation with several hundred-fold fast change on the surface area opens a brand new direction of manufacturing future transformable *** unusual findings on a self-fueled liquid metal with biological life-like behavior to freely explore the unknown space that solves the energy supply issue also came into being,holding big promise for making bionic transformable *** Account aims to systematically sort out the developmental history of liquid metal transformable machines with special focus on the fundamental scientific discoveries,the underlying mechanisms,and the potential applied scenarios based on liquid metal enabled solid−liquid *** fantastic properties and unique transformation capabilities of liquid metals have built the basis for a new era of designing soft robotics and we believe that liquid metal transformable machines a

关键词： transformation machines Liquid

Effect of acupuncture treatment on nonketotic hyperglycemic hemichorea-hemiballismus:a case report

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Journal of Traditional Chinese Medicine 2023年第4期43卷 829-833页

作者： chen Ying SUN Jingqing LYU Tianli HONG Jiahui liu Yuhan ZHU liying LI Bin liu Lu Department of Acupuncture and Moxibustion Beijing Hospital of Traditional Chinese MedicineCapital Medical UniversityBeijing 100010China

Nonketotic hyperglycemic hemichorea-hemiballismus is a rare syndrome in the clinic,and treatment is often *** therapy is the most widely used and effective treatment,but some patients experience a slower *** symptomatic treatment medicines have some degree of side *** treatment is beneficial for hemichoreahemiballismus.A male patient,aged 59 years,first visited our hospital outpatient department due to motor agitation with involuntary movements of the right *** had a history of type 2 diabetes mellitus and poor blood glucose *** serum glucose was 26.5 mmol/L(normal:4.4-6.1 mmol/L),and magnetic resonance imaging demonstrated an irregular area of high signal intensity in T1-weighted imaging,low signal intensity on T2-weighted imaging,and high signal intensity in the left corpus striatum in T2-FLAIR *** was recommended for the *** ruling out other possibilities,he was eventually diagnosed with nonketotic hyperglycemic *** glycemic control was immediately started with subcutaneous injection and acupuncture treatment at“governor vessel 13 acupoints”,and the involuntary movements completely disappeared on the ninth day of *** pathophysiology of nonketotic hyperglycemic hemichorea-hemiballismus is *** patient histories lead to different brain tissue conditions,and relapses and uncontrolled blood glucose add difficulties to *** to Traditional Chinese Medicine theory,insufficient kidney essence leads to brain dystrophy and causes the symptoms of *** evidence has shown that acupuncture at"governor vessel 13 acupoints"has a beneficial treatment effect on nonketotic hyperglycemic hemichorea-hemiballismus.

关键词： nonketotic hyperglycemic hemichorea-hemiballismus governor vessel acupuncture therapy case reports