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Structural Feature and Internal Motion of Hyperbranching Cluster System with Low Polydispersity and Featured Pattern in Dilute Solutions

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Chinese Journal of Polymer Science 2022年第12期40卷 1515-1521,I0006页

作者： Si-Qi Huang Mo Zhu jin-xian Yang Lian-Wei Li College of Chemistry and Environmental Engineering Shenzhen UniversityShenzhen 518060China Department of Chemical Physics University of Science and Technology of ChinaHefei 230026China

This work reports the structural feature and internal motion of one novel hyperbranching cluster system in dilution *** cluster system is composed of HB-PS_(300)-g-Pt BA_(45) hypergraft copolymer chains with uniform subchain,high molar mass and low polydispersity(M_(w)=1.73×106 g/mol and≈1.07),where HB-PS and Pt BA represent hyperbranched polystyrene core and poly(tert-butyl polyacrylate)graft,*** the selective solvent of PS blocks(cyclohexane,T_(θ)=34.5℃),the aggregation kinetics and structural feature are found to be precisely tunable for assembled clusters by the aggregation temperature(11℃

关键词： Hyperbranching cluster Structural feature Internal motion

Regioselective enzymatic acylation of troxerutin in nonaqueous medium

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Chinese Chemical Letters 2010年第1期21卷 59-62页

作者： Xiao, Yong Mei Mao, pu Zhao, Zhen Yang, Liang Ru Lin, xian Fu Henan Univ Technol Coll Chem & Chem Engn Zhengzhou 450001 Peoples R China Zhejiang Univ Dept Chem Hangzhou 310027 Peoples R China

A series of monosubstituted troxerutin esters have been synthesized by enzyme-catalyzed regioselective acylation of troxerutin in nonaqueous *** divinyl dicarboxylates(CH_2=CH-OOC-(CH_2)_n-COO-CH=CH_2,n = 2,3,4,7,8,11) featuring different chain length as acyl donors and alkaline protease from Bacillus subtilis as catalyst,troxerutin was regioselective acylated at B ethoxyl *** results indicated that the regioselectivity of the enzyme-catalyzed acylation was not affected by the chain length o...

关键词： Troxerutin Acylation Enzymatic synthesis Regioselectivity

Homopolymerization of N-pyrimidinyl acrylamide

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Chinese Chemical Letters 2007年第9期18卷 1141-1144页

作者： De Cheng Wan Hong Ting pu Gen jin Yang Institute of Functional Polymers School of Materials Science&EngineeringTongji UniversityShanghai 200092China School of Pharmacy The Second Military Medical UniversityShanghai 200433China

Homopolymerization of N-pyrimidinyl acrylamide (NPA) was reported for the first time. The polymer (polyNPA) was soluble only in acidic media and fluoroalcohols, and only in fluoroalcohol was homogeneous polymerization of NPA feasible. 1H NMR analysis proved that a 1:1 H-bonding complex could be formed between NPA and α,α-bis(trifluoromethyl)phenyl propan-2-ol (BTMP). Cumyl dithiobenzoate mediated reversible addition-fragmentation chain transfer (RAFT) polymerization of NPA in BTMP was carried out. 1H NMR analyses proved that the molecular weight increased linearly with the monomer conversion. The polymer prepared in conventional solvents was atactic while in protic media the syndiotacticity was slightly enhanced.

关键词： N-pyrimidinyl acrylamide H-Bonding Fluoroalcohol Homopolymerization RAFT

Synthesis and characterization of biodegradable amphiphilic PEG-grafted poly(DTC-co-CL)

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Chinese Chemical Letters 2010年第10期21卷 1255-1258页

作者： Qiu jin Zhang Wei pu Zhu Zhi Quan Shen MOE Key Laboratory of Macromolecule Synthesis and Functionalization Department of Polymer Science and Engineering Zhejiang University Hangzhou 310027 China

A novel biodegradable copolymer, poly（5,5-dibromomethyltrimethylene carbonate-co-ε-caprolactone）（poly（DBTC-co-CL）） with pendant bromine groups, was synthesized via ring-opening polymerization （ROP） of ε-caprolactone （CL） and 5,5- dibromomethyltrimethylene carbonate （DBTC） using stannous octoate （Sn（Oct）2） as catalyst. Then the pendant bromine groups were completely converted into azide form, which permitted ＂click＂ reaction with alkyne-terminated polyethylene （A-PEG） by Huisgen 1,3-dipolar cycloadditions preparing biodegradable amphiphilic poly（DTC-co-CL）-g-PEG graft copolymer. The graft copolymer was characterized by nuclear magnetic resonance （NMR） and size-exclusion chromatography （SEC）.

关键词： Polycarbonate "Click" reaction Graft copolymer Ring-opening polymerization

Changes in neurotransmitter levels,brain structural characteristics,and their correlation with PANSS scores in patients with firstepisode schizophrenia

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World Journal of Clinical Cases 2023年第22期11卷 5215-5223页

作者： xian-Jia Xu Tang-Long Liu Liang He Ben pu The Fifth Ward Ningbo Psychiatric HospitalNingbo 315000Zhejiang ProvinceChina Department of Science and Education Ningbo Psychiatric HospitalNingbo 315000Zhejiang ProvinceChina The Sixteenth Ward Ningbo Psychiatric HospitalNingbo 315000Zhejiang ProvinceChina The Twelfth Ward Ningbo Psychiatric HospitalNingbo 315000Zhejiang ProvinceChina

BACKGROUND In patients with schizophrenia,the brain structure and neurotransmitter levels change,which may be related to the occurrence and progression of this *** To explore the relationships between changes in neurotransmitters,brain structural characteristics,and the scores of the Positive and Negative Symptom Scale(PANSS)in patients with first-episode *** The case group comprised 97 patients with schizophrenia,who were evaluated using the Canadian Neurological Scale and confirmed by laboratory tests at Ningbo Mental Hospital from January 2020 to July *** control group comprised 100 healthy *** all participants,brain structural characteristics were explored by measuring brain dopamine(DA),glutamic acid(Glu),and gamma-aminobutyric acid(GABA)levels,with magnetic resonance *** case group was divided into negative and positive symptom subgroups using PANSS scores for hierarchical *** correlation analysis was used to analyze the correlations between neurotransmitters,brain structural character istics,and PANSS *** Patients in the case group had higher levels of DA and lower levels of Glu and GABA,greater vertical and horizontal distances between the corpus callosum and the inferior part of the fornix and larger ventricle area than patients in the control group(Ppus callosum and the infrafornix,and ventricular area,and was significantly negatively correlated with Glu and GABA(Ppus callosum and the infrafornix,horizontal distance between the corpus cal

关键词： Brain structural characteristics Negative symptoms Neurotransmitters positive symptoms Schizophrenia

Study on Water-Soluble Organic Reducing Substances. I. Determination of Organic Reducing Substances by Differential pulse Voltammetry

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Pedosphere 1991年第2期1卷 157-167页

作者： WUYOU－xian DINGCHANG－pu InstituteofSoilScience AcademiaSinica.P.O.Box821Nanjing210008（China） InstituteofSoilScience Academia

A new method was proposed for study of organic reducing substances in soils. According to the theoretical relationship between the voltammetric behaviors and reduction-oxidation reaction of reducing substances, the working conditions of differential pulse voltammetry (d.p. v.) for determining the organic reducing substances produced during the processes of the anaerobic decomposition of plant materials were established with a glass carbon electrode as working electrode, 1 M Ag-AgCl electrode with large area as reference electrode, 0.2 M NH4AC as supporting electrolyte and pH buffer solution, pulse amplitude (AE) of 25 mV, scan rate at 2 mV·S-1and scan potential ranging from -0.5 to +1.2 voltage(vs. M Ag-AgCl). The peak current proportional to the concentration of reducing substances, and the characteristic peak potential of each organic reducing substance were regarded as the quantitative and qualitative base, respectively. These results obtained under the conditions mentioned above directly reflect both the reducing intensity and capacity of the organic reducing system in soils.

关键词： differential pulse voltammetry organic reducing substances peak current peak potential

Stability Analysis of Discrete-time Systems with Additive Time-varying Delays

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International Journal of Automation and computing 2010年第2期7卷 219-223页

作者： xian-Ming Tang jin-Shou Yu Research Institute of Automation East China University of Science and Technology Shanghai 200237 PRC

In this paper, the problem of stability analysis of discrete-time delay systems with two additive time-varying delays is considered. A new stability result is derived for a general class of delay systems which has practical application background in networked control systems . The stability criterion is expressed in the form of linear matrix inequalities （LMIs）, which can be readily solved by using standard numerical software. An illustrative example is provided to show the advantage of the proposed stability condition.

关键词： Additive delays discrete time-delay system delay-dependence linear matrix inequality (LMI) networked control system

Study on Water-Soluble Organic Reducing Substances: II. Organic Reducing Substances Produced from Anaerobic Decomposition of Milk Vetch (Astragalus sinicus L.)

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Pedosphere 1992年第4期2卷 355-362页

作者： WUYOU－xian DINGCHANG－pu InstituteofSoilScience AcademiaSinicaP.O.Box821Nanjing210008（China） InstituteofSoilScience Academia

The characteristics of electric charge and molecular weight distribution,oxidation-reduction regimes,*** and amounts of organic reducing substances produced by milk vetch during anaerobic decomposition process,were studied by using electrochemical *** between soils and organic reducing substances was also *** results indicate that the organic reducing substances were mainly the organic compounds with negative and amphoteric charges,which were distributed in two groups at anodic peak potentials of 0.25 and 0.69 volt in differential pulse voltammograms,*** apparent molecular weights are all less than 700 daltons,in which those active in oxidation-reducion reaction were distributed in the fraction with apparent molecular weight less than 200 *** organic reduction substances can be oxidized by manganese oxides in their interaction with soils.

关键词： electric charge milk vetch molecular weight organic reducing substances oxidation-reduction regime

Monoclonal Gammopathy of Renal Significance(MGRS): Prospects for Treatment in Integrated Chinese and Western Medicine

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Chinese Journal of Integrative Medicine 2021年第9期27卷 643-648页

作者： LI jin-pu DU Ya-ting LI Shen RAO xiang-rong Department of Nephrology Guang'anmen HospitalChina Academy of Chinese Medical SciencesBeijing(100053)China

Monoclonal gammopathy of renal significance(MGRS)is a pathological state which presents with a spectrum of renal *** is characterized by pathogenic monoclonal immunoglobulins or light chains produced by a premalignant plasma cell or B cell *** view of inadequate understanding in the past,the low detection rate of MGRS often results in poor outcomes and reduces quality of life of ***,MGRS stands for a group of clinical refractory renal *** date,no standard treatment strategy for MGRS is *** consensus suggests a clone-directed approach that aims to eradicate the offending clone,but its long-term prognosis is not *** this article,we discuss the diagnostic methods,highlight treatment advances,and introduce integrated Chinese and Western medicine in the management of MGRS.

关键词： monoclonal gammopathy of renal significance Chinese medicine integrative medicine