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How to select the quantitative magnetic resonance technique for subjects with fatty liver:A systematic review

World Journal of Clinical Cases 2022年第25期10卷 8906-8921页

作者： You-Wei Li Yang Jiao Na chen Qiang Gao yu-kun chen yuan-Fang Zhang Qi-Ping Wen Zong-Ming Zhang Department of Radiology Beijing Rehabilitation HospitalCapital Medical UniversityBeijing 100144China Department of Rehabilitation Psychology Beijing Rehabilitation HospitalCapital Medical UniversityBeijing 100144China Department of Otorhinolaryngology Beijing Rehabilitation HospitalCapital Medical UniversityBeijing 100144China Department of Gastroenterology and Hepatology Beijing Rehabilitation HospitalCapital Medical UniversityBeijing 100144China Department of General Surgery Beijing Electric Power HospitalState Grid Corporation of ChinaCapital Medical UniversityBeijing 100073China

BACKGROUND Early quantitative assessment of liver fat content is essential for patients with fatty liver *** evidence has shown that magnetic resonance(MR)technique has high accuracy in the quantitative analysis of fatty liver,and is suitable for monitoring the therapeutic effect on fatty ***,many packaging methods and postprocessing functions have puzzled radiologists in clinical ***,selecting a quantitative MR imaging technique for patients with fatty liver disease remains *** To provide information for the proper selection of commonly used quantitative MR techniques to quantify fatty *** We completed a systematic literature review of quantitative MR techniques for detecting fatty liver,following the Preferred Reporting Items for Systematic Reviews and Meta-Analyses *** were retrieved from PubMed,Embase,and Cochrane Library databases,and their quality was assessed using the Quality Assessment of Diagnostic Studies *** Reference Citation Analysis database(https://***)was used to analyze citation of articles which were included in this *** Forty studies were included for spectroscopy,two-point Dixon imaging,and multiple-point Dixon imaging comparing liver biopsy to other imaging *** advantages and disadvantages of each of the three techniques and their clinical diagnostic performances were *** The proton density fat fraction derived from multiple-point Dixon imaging is a noninvasive method for accurate quantitative measurement of hepatic fat content in the diagnosis and monitoring of fatty liver progression.

关键词： Fatty liver Hepatic fat content ~1H-magnetic resonance spectroscopy Multiple-point Dixon imaging Two-point Dixon imaging

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Fully bio-based,highly toughened and heat-resistant poly(L-lactide) ternary blends via dynamic vulcanization with poly(D-lactide) and unsaturated bioelastomer

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Science China Materials 2017年第10期60卷 1008-1022页

作者： Wan-Jie Si Xu-Pei An Jian-Bing Zeng yu-kun chen yu-Zhong Wang School of Chemistry and Chemical Engineering Southwest University Chongqing 400715 China Key Laboratory of Polymer Processing Engineering Ministry of Education South China University of Technology Guangzhou 510641 China Center for Degradable and Flame-Retardant Polymeric Materials College of Chemistry State Key Laboratory of Polymer Materials Engineering National Engineering Laboratory of Eco-Friendly Polymeric Materials （Sichuan） Sichuan University Chengdu 610064 China

Inherent brittleness and low heat resistance are the two major obstacles that hinder the wide applications of poly（L-lactide）（PLLA）. In this study,we report a fully biobased,highly toughened and heat-resistant PLLA ternary blend,which was prepared by dynamic vulcanization of PLLA with poly（D-lactide）（PDLA） and an unsaturated bioelastomer（UBE）. The results indicated that during dynamic vulcanization PDLA cocrystallized with PLLA to form stereocomplex（SC） crystallites,which not only enhanced the molecular entanglement but also accelerated the crystallization rate of PLLA matrix. With increase in the content of PDLA,the matrix molecular entanglement increased while phase-separation was enhanced,which enabled the impact strength to increase first and then decrease. The ternary blends containing 10 wt.% PDLA showed the highest impact strength. The presence of SC crystallites makes it possible to achieve a fully sustainable PLLA/VUB/PDLA ternary blend with highly crystalline matrix under conventional injection molding,due to the high nucleation efficiency of SC towards crystallization of PLLA. The highly crystalline ternary blend showed excellent heat resistance and better impact toughness than high impact polystyrene.

关键词： poly(L-lactide) poly(D-lactide) dynamic vulcanization toughness heat resistance

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耐摩擦型全氟聚醚硅氧烷的制备与性能

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精细化工 2017年第7期34卷 730-734页

作者：冯裕智陈坤唐旭东天津科技大学化工与材料学院天津300457

以K型全氟聚醚醇、K型三羟基全氟聚醚、双端Z型全氟聚醚醇、烯丙基氯和三甲氧基硅烷为原料,氯铂酸为催化剂,通过硅氢加成制备了三类全氟聚醚硅氧烷。用FTIR、~1HNMR对K型全氟聚醚硅氧烷的结构进行了表征,并利用接触角和耐摩擦实验对全... 详细信息

以K型全氟聚醚醇、K型三羟基全氟聚醚、双端Z型全氟聚醚醇、烯丙基氯和三甲氧基硅烷为原料,氯铂酸为催化剂,通过硅氢加成制备了三类全氟聚醚硅氧烷。用FTIR、~1HNMR对K型全氟聚醚硅氧烷的结构进行了表征,并利用接触角和耐摩擦实验对全氟聚醚硅氧烷的耐摩擦性能进行了测试,考察了全氟硅氧烷链结构、含量、相对分子质量和硅氧烷水解促进剂对涂层耐摩擦性能的影响。结果表明:质量分数为0.1%的三类全氟聚醚硅氧烷涂层对水和正十六烷的接触角均分别高于113.1°和65.2°,具有良好的疏水疏油性能。双端Z型全氟聚醚硅氧烷(Mn=2 500)的耐摩擦性能最好,在负载质量为1 035 g时,经钢丝绒循环摩擦2 500次后,水接触角仍可保持100°以上。在K型全氟聚醚三硅氧烷(Mn=2 800)喷涂液中,添加质量浓度为0.5 mg/L的乙酸和质量分数为0.5%的异丙醇混合硅氧烷水解促进剂,可将涂层的耐摩擦性能从1 000次提升到1 100次。

关键词：全氟聚醚硅氧烷接触角耐摩擦性能功能材料

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Modular assembly of Co4-thiacalix[4]arene units and Keggin-type SiW12O40 for visible-light photothermal conversion

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Tungsten 2025年第1期7卷 112-119页

作者： Jia-Hui Li Qing Zhao Dong-Ao Mao kun Zhou Bao-Kuan chen Yan-Feng Bi School of Petrochemical Engineering Liaoning Petrochemical University

The construction of metal-organic coordination clusters（MCCs） using modular secondary building units is an important method for preparing functional *** this study,two new MCCs modularly assembled from Keggin-type {SiW12O40}H4TC4A=p-tert-Butylthiacalix[4]arene(SiW12) units and thiacalixarene-supported Co4-thiacalix[4]arene(Co4-TC4A polynuclear second-building units（PSBUs,H4TC4A=p-tert-Butylthiacalix[4]arene） are *** two MCCs,abbreviated as Co4-SiW12and Co8-SiW12,were structurally characterized by single-crystal X-ray *** Co4-SiW12is a supramolecular structure involving cation-anion interactions between Co4-TC4A PSBUs and ***8-SiW12features "barbell-like" shapes with two Co4-TC4A coordinatively linked to a Keggin-type SiW12unit on opposite via W-O_t-Co *** coordination of Co4-TC4A to SiW12in Co8-SiW12resulted in significantly improved photothermal conversion performances compared with Co4-SiW12and pure SiW12or ***-gap determination and photophysical analysis combined with density functional theory calculations indicated the binding mode between Co4-TC4A PSBUs and SiW12,which considerably influences the way of electron transport and the conversion ability of visible light to heat.

关键词： Modular construction Photothermal conversion Polyoxometalate Thiacalixarene

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Analysis of Micromechanical Properties at the Interface of Pre-wet SBS Modified Asphalt Mixture Based on Molecular Simulation Technology

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Journal of Wuhan University of Technology(Materials Science) 2025年第1期40卷 103-113页

作者： chen Wuxing chen Shuang yu Yan ZHANG Jiangyi XU Haiyang GUO Wei School of Mines China University of Mining and TechnologyXuzhou 221000China College of Construction Engineering Jilin Uni-versityChangchun 130026China

The pre-wetting of aggregate surface is a means to improve the interface performance of SBS modified asphalt and *** effect of pre-wetting technology on the interaction between SBS modified asphalt and aggregate was analyzed by molecular dynamics *** diffusion coefficient and concentration distribution of SBS modified asphalt on aggregate surface are *** simulation results show that the diffusion coefficient of the aggregate surface of SBS modified asphalt is increased by 47.6%and 70.5%respectively after 110#asphalt and 130#asphalt are *** concentration distribution of SBS modified asphalt on the aggregate surface after pre-wetting is more *** to the results of interface energy calculation,the interface energy of SBS modified bitumen and aggregate can be increased by about 5%after *** to the results of molecular dynamics simulation,the pre-wetting technology can effectively improve the interface workability of SBS modified bitumen and aggregate,so as to improve the interface performance.

关键词： pre-wet oil-stone interface interface interaction interface mechanics molecular dynamics simulation

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Mechanistic insight into the synergy between nickel single atoms and nanoparticles on N-doped carbon for electroreduction of CO2

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Journal of Energy Chemistry 2025年第1期100卷 327-336页

作者： Mingdong Sun Wenwen Guan Cailing chen Chao Wu Xiaoling Liu Biao Meng Tao chen yu Han Jun Wang Shibo Xi yu Zhou State Key Laboratory of Materials-Oriented Chemical Engineering College of Chemical Engineering Nanjing Tech University Advanced Membranes and Porous Materials Center Physical Sciences and Engineering Division King Abdullah University of Science and Technology Institute of Sustainability for Chemicals Energy and Environment A*STAR (Agency for Science Technology and Research) College of Materials Science and Engineering Sichuan University

The synergy of single atoms （SAs） and nanoparticles （NPs） has demonstrated great potential in promoting the electrocatalytic carbon dioxide reduction reaction （CO2RR）;however,the rationalization of the SAs/NPs proportion remains one challenge for the catalyst ***,a Ni2+-loaded porous poly（ionic liquids）(PIL) precursor synthesized through the free radical self-polymerization of the ionic liquid monomer,1-allyl-3-vinylimidazolium chloride,was pyrolyzed to prepare the Ni,N co-doped carbon materials,in which the proportion of Ni SAs and NPs could be facilely modulated by controlling the annealing *** catalyst Ni-NC-1000 with a moderate proportion of Ni SAs and NPs exhibited high efficiency in the electrocatalytic conversion of CO2into *** Ni K-edge X-ray absorption near-edge structure （XANES） spectra and theoretical calculations were conducted to gain insight into the synergy of Ni SAs and *** charge transfer from Ni NPs to the surrounding carbon layer and then to the Ni SAs resulted in the electron-enriched Ni SAs active *** the electroreduction of CO2,the coexistence of Ni SAs and NPs strengthened the CO2activation and the affinity towards the key intermediate of*COOH,lowering the free energy for the potential-determining*CO2→*COOH step,and therefore promoted the catalysis efficiency.

关键词： Activation energy

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New glucocerebrosidase antibodies can advance research in the field of neurodegenerative disorders

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Neural Regeneration Research 2025年第4期20卷 1085-1086页

作者： Charis Ma Krystyna Rytel yu chen Ellen Sidransky Medical Genetics Branch National Human Genome Research InstituteNational Institutes of HealthBethesdaMDUSA

In medical research,there are times when the introduction of a new tool can launch scientific discovery in new *** antibody development may be considered mundane,in the field of glucocerebrosidase(GCase)research,the dearth of validated antibodies for different applications has impeded progress in studies of disease pathogenesis and therapeutic *** recent introduction of new,rigorously evaluated antibodies can now propel research into the link between glucocerebrosidase and Parkinson’s disease(PD)as well as aspects of the pathobiology of Gaucher disease(Jong et al.,2024).

关键词： antibodies cerebro

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STUDIES ON PAPAIN Ⅲ.ESSENTIAL HISTIDINE AND TRYPTOPHAN GROUPS

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Science in China,Ser.A 1963年第6期 879-884页

作者：孙玉琨邹承鲁 Institute of Biochemistry Academia Sinica Shanghai

Photooxidation of papain led to loss in activity and destruction of histidine and *** these reactions were found to be first order,and the rate constant for the loss inactivity equalled exactly the sum of the rate constants for the destruction of histidine and tryp-tophan *** reaction of papain at pH5.0 with N-bromosuccinimide has also been *** such conditions the reagent selectively oxidized the tryptophan residues of papain withoutsignificant cleavage of the peptide *** decrease in activity corresponded exactly to thedestruction of tryptophan *** above results show the essentiality of one histidine andone tryptophan residue for the activity of papain.

关键词： show STUDIES ON PAPAIN ESSENTIAL HISTIDINE AND TRYPTOPHAN GROUPS

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STUDIES ON PAPAIN Ⅰ.HYDROLYTIC AND ACYL TRANSFER REACTIONS

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Science in China,Ser.A 1963年第2期 201-212页

作者：孙玉昆邹承鲁 Institute of Biochemistry Academia Sinica Shanghai

The effect of pH on the papain catalyzed hydrolysis of several synthetic substrates has beenfound to be of the noncompetitive type,i.e.,the maximal reaction velocities（V）change with pHwhereas the Michaelis constants are not *** appears to show that,for papain,theMichaelis constants（KM）are identical with the dissociation constants of the enzyme-substratecomplexes（Ks）.The papain catalyzed acyl-transfer reactions have been measured directly by the decrease inα-amino groups of the acceptor *** 50% aqueous methanol,pH7.4,papain catalyzedthe acyl-transfer reactions between Cbz-Gly-NH2,Cbz-Leu-NH2,or Cbz-Ser-NH2 as acyl donors andGly-OEt as acyl acceptors;under these conditions,the hydrolysis of the donor molecule did nottake *** substrate specificities of the acyl-transfer and hydrolytic reactions have been *** the conditions mentioned above,Cbz-Gly-NH2 Cbz-Ser-NH2,and Cbz-Leu-NH2 but notBz-Arg-NH2 nor Cbz-Glu-（NH2）2 served as donors for the acyl-transfer *** estersand amides of a number of amino acids and peptides could serve as acyl *** theamino acid esters tested,tyrosine ester did not take part in acyl-transfer reactions.A study of the effect of substrate concentrations on the rate of the acyl-transfer reaction withCbz-Gly-NH2 as donor and Gly-OEt as acceptor showed that the acceptor was more tightly boundto the enzyme than the donor.

关键词： Gly HYDROLYTIC AND ACYL TRANSFER REACTIONS STUDIES ON PAPAIN NH

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Precise gradient separation of nanoparticles using reduced graphene oxide-polyoxomolybdate membranes

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Science China Chemistry 2025年第1期68卷 209-216页

作者： Yixin Yang Wanlei Zhao Ruoxuan Zheng Hongqiang Li Wei chen yu-Fei Song State Key Laboratory of Chemical Resource Engineering Beijing University of Chemical Technology Quzhou Institute for Innovation in Resource Chemical Engineering

The purification and size sieving of nanoparticles （NPs） represents a significant scientific ***,the r GO-polyoxometalates (POMs=PMo12,Mo132and Mo368) membranes were fabricated successfully via a simple and scalable POMsassisted in-situ photoreduction *** the mass ratio of r GO to PMo12was 1:30,the resultant r GO-PMo12membranes with highly ordered and uniform nanochannels of 1.0 nm can be obtained,which showed an accurate carbon quantum dots（CQDs） separation with a cut-off size approximately 1.0 *** increase of the size of the interlayered POMs from PMo12（1.0 nm）,{Mo132}（2.9 nm） to{Mo368}（3.8 nm）,the resultant r GO-PMo12,r GO-Mo132and r GO-Mo368exhibited precise gradient separation of CQDs and Au nanoparticles by size exclusion *** results pave a promising way to construct new twodimensional （2D） membranes for highly efficient size-selective separation.

关键词： reduced graphene oxide polyoxometalates membranes gradient separation nanoparticles

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