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A THEORETIC METHOD TO PREDICT POLYMER SOLUBILITY PARAMETERS

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Chinese Journal of Polymer Science 2007年第2期25卷 203-206页

作者： Qing Ji Bao-fu qiao De-lu zhao State Key Laboratoryof Polymer Physics and Chemistry Institute of Chemistry Chinese Academy of Sciences Beijing 100080 China

A partition function and a complete thermodynamic description for pure polymer fluids have been investigated based on a self-avoid-walk lattice model. Caused by the introduction of Gibbs distribution into the Flory-Huggins theory, the partition function and the thermodynamic description depicted their dependence on temperature well. In the present study, we applied the theory to calculate polymer solubility parameters. The polymer solubility parameters predicted by our theory are well consistent with the experiment values.

关键词： Polymer Solubility parameters Gibbs distribution.

Glycoside-specific metabolomics combined with precursor isotopic labeling for characterizing plant glycosyltransferases

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Molecular Plant 2022年第10期15卷 1517-1532页

作者： Jie Wu Wentao Zhu Xiaotong Shan Jinyue Liu Lingling zhao qiao zhao Shenzhen Key Laboratory of Synthetic Genomics Guangdong Provincial Key Laboratory of Synthetic GenomicsCAS Key Laboratory of Quantitative Engineering BiologyShenzhen Institute of Synthetic BiologyShenzhen Institutes of Advanced TechnologyChinese Academy of SciencesShenzhen 518055China Innovation Center of Pesticide Research Department of Applied ChemistryCollege of ScienceChina Agricultural UniversityBeijing 100193China Center for Plant Biology School of Life SciencesTsinghua UniversityBeijing 100084China

Glycosylation by uridine diphosphate-dependent glycosyltransferases(UGTs)in plants contributes to the complexity and diversity of secondary *** are generally promiscuous in their use of acceptors,making it challenging to reveal the function of UGTs in ***,we described an approach that combined glycoside-specific metabolomics and precursor isotopic labeling analysis to characterize UGTs in *** revisited the UGT72E cluster,which has been reported to catalyze the glycosylation of ***-specific metabolomics analysis reduced the number of differentially accumulated metabolites in the ugt72e1e2e3 mutant by at least 90%compared with that from traditional untargeted metabolomics *** addition to the two previously reported monolignol glycosides,a total of 62 glycosides showed reduced accumulation in the ugt72e1e2e3 mutant,22 of which were phenylalanine-derived glycosides,including 5-OH coniferyl alcohol-derived and lignan-derived glycosides,as confirmed by isotopic tracing of[^(13)C_(6)]-phenylalanine *** method revealed that UGT72Es could use coumarins as substrates,and genetic evidence showed that UGT72Es endowed plants with enhanced tolerance to low iron availability under alkaline *** the newly developed method,the function of UGT78D2 was also *** case studies suggest that this method can substantially contribute to the characterization of UGTs and efficiently investigate glycosylation processes,the complexity of which have been highly underestimated.

关键词： glycosyltransferases glycosides-specific metabolomics precursor isotopic labeling glucoside Arabidopsis thaliana phenylpropanoid coumarins

The research on floe ice force acting on the"Xue Long"icebreaker based on synthetic ice test and virtual mass numerical method

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Journal of Hydrodynamics 2021年第2期33卷 271-281页

作者： Wei Guo qiao-sheng zhao Yu-kui Tian Wan-chao Zhang State Key Laboratory of Hydrodynamics China Ship Scientific Research CenterWuxi 214082China School of Naval Architecture and Ocean Engineering Jiangsu University of Science and TechnologyZhenjiang 212003China

When the ice-going ships advance in the polar region,the navigation in the floe ice region is often encountered,the hull will suffer the high-frequency contact force produced by the floe ice,which will affect the navigation performance of the ***,it is necessary to predict the water and ice force acting on the hull *** this paper,the numerical simulation and experimental verification will be conducted for the polar scientific research ship-"Xue Long".Based on the computational fluid dynamics(CFD)and DEM theory,a virtual mass method is proposed to realize the predicting of the water and ice force and the simulation of the interaction phenomenon between the ice and hull,the numerical method is built to calculate the force acting on the *** the same time,the synthetic ice is used to carry out the experimental research on the advancing straight with different speeds and the oblique navigation with different drift *** optimal virtual mass coefficient is determined through the comparison and analysis of the numerical simulation and test results under typical *** to the optimal virtual mass coefficient,the numerical simulation is carried out with different speeds and drift angles,which is compared with the experiment more *** is found that the virtual mass method based on the combination of CFD and DEM can simulate the overturning and the sliding along the hull of the floe ice vividly,the relative error of the total resistance between model test and numerical method in advancing straight is almost within 10%,while the relative error of the total longitudinal force in oblique navigation is almost within 15%.

关键词： "Xue Long"ship synthetic ice model test computational fluid dynamics(CFD) DEM virtual mass method drift angle

Hydrodynamic Analysis and Power Conversion for Point Absorber WEC with Two Degrees of Freedom Using CFD

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China Ocean Engineering 2018年第6期32卷 718-729页

作者： GUO Wei ZHOU Ya-hui ZHANG Wan-chao zhao qiao-sheng State Key Laboratory of Hydrodynamics China Ship Scientific Research Center School of Naval Architecture and Ocean Engineering Jiangsu University of Science and Technology

Point absorber wave energy device with multiple degrees of freedom(DOF) is assumed to have a better absorption ability of mechanical energy from ocean waves. In this paper, a coaxial symmetric articulated point absorber wave energy converter with two degrees of freedom is presented. The mechanical equations of the oscillation buoy with power take-off mechanism(PTO) in regular waves are established. The three-dimensional numerical wave tank is built in consideration of the buoy motion based upon the CFD method. The appropriate simulation elements are selected for the buoy and wave parameters. The feasibility of the CFD method is verified through the contrast between the numerical simulation results of typical wave conditions and test results. In such case, the buoy with single DOF of heave, pitch and their coupling motion considering free(no PTO damping) and damped oscillations in regular waves are simulated by using the verified CFD method respectively. The hydrodynamic and wave energy conversion characteristics with typical wave conditions are analyzed. The numerical results show that the heave and pitch can affect each other in the buoy coupling motion, hydrodynamic loads, wave energy absorption and flow *** total capture width ratio with two coupled DOF motion is higher than that with a single DOF motion. The wave energy conversion of a certain DOF motion may be higher than that of the single certain DOF motion even though the wave is at the resonance period. When the wave periods are high enough, the interaction between the coupled DOF motions can be neglected.

关键词： CFD simulation wave energy conversion numerical tank coupling motion capture width ratio

Making small molecules in plants:A chassis for synthetic biology-based production of plant natural products

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Journal of Integrative Plant Biology 2023年第2期65卷 417-443页

作者： Xinyu Liu Peijun Zhang qiao zhao Ancheng C.Huang Key Laboratory of Molecular Design for Plant Cell Factory of Guangdong Higher Education Institutes Department of BiologySchool of Life SciencesSUSTech-PKU Institute of Plant and Food ScienceSouthern University of Science and TechnologyShenzhen 518055China Shenzhen Institutes of Advanced Technology(SIAT) the Chinese Academy of SciencesShenzhen 518055China

Plant natural products have been extensively exploited in food,medicine,flavor,cosmetic,renewable fuel,and other industrial *** biology has recently emerged as a promising means for the cost-effective and sustainable production of natural *** with engineering microbes for the production of plant natural products,the potential of plants as chassis for producing these compounds is underestimated,largely due to challenges encountered in engineering *** in plant engineering is instrumental for enabling the effective and efficient production of valuable phytochemicals in plants,and also paves the way for a more sustainable future *** this manuscript,we briefly recap the biosynthesis of plant natural products,focusing primarily on industrially important terpenoids,alkaloids,and *** further summarize the plant hosts and strategies that have been used to engineer the production of natural *** challenges and opportunities of using plant synthetic biology to achieve rapid and scalable production of high-value plant natural products are also discussed.

关键词： biosynthesis natural products plant engineering synthetic biology

Pd(OAc)_(2)/PPh_(3)-Catalyzed Desulfonylative Homocoupling of Arylsulfonyl Chlorides

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Chinese Journal of Chemistry 2015年第5期33卷 535-538页

作者： qiao zhao Liangshun Chen Hongyue Lang Shengying Wu Limin Wang Shanghai Key Laboratory of Functional Materials Chemistry East China University of Science and TechnologyShanghai 200237China Key Laboratory of Organofluorine Chemistry Shanghai Institute of Organic ChemistryChinese Academy of SciencesShanghai 200032China

The Pd-catalyzed homodimerization with respect to arylsulfonyl chlorides as an efficient method for the synthesisof biaryls has been developed. This desulfonylative reaction which was performed at reflux in 1,4-dioxan... 详细信息

关键词： biaryls arylsulfonyl chlorides desulfonylative palladium-catalyzed

Size dependence of carbon-encapsulated iron-based nanocatalysts for Fischer–Trposch synthesis

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Nano Research 2023年第5期16卷 6270-6277页

作者： Xiaoxue Han Jing Lv Shouying Huang qiao zhao Yue Wang Zhenhua Li Xinbin Ma Key Laboratory for Green Chemical Technology of Ministry of Education School of Chemical Engineering and TechnologyTianjin UniversityTianjin 300072China Zhejiang Institute of Tianjin University Ningbo 315201China Haihe Laboratory of Sustainable Chemical Transformations Tianjin 300192China

The conversion from syngas derived from non-petroleum recourses to liquid fuels and chemicals via Fischer–Tropsch synthesis(FTS)is regarded as an alternative and potential *** catalyst with controllable particle size and clarifying size effect are of significance to promote the ***,we engineered carbon-encapsulation structure to restrict particle growth but avoid strong metal–support *** prepared carbon-encapsulated nanoparticles(Fe@C)showed a superior catalytic activity compared with conventional carbon-supported nanoparticles(Fe/C).By tuning particle size from 3.0 to 9.1 nm,a volcano-like trend of iron time yield(FTY)peaked at 2659μmol·gFe^(−1)·s^(−1)is obtained with an optimum particle size of 5.3 *** to temperature-programmed reduction and desorption results,a linear relationship between apparent turnover frequency and CO dissociation capacity was *** enhanced CO dissociative adsorption along with weakened H_(2)activation on larger nanoparticles resulted in higher C_(5+)*** study provides a strategy to synthesize carbon supported metal catalysts with controllable particle size and insight into size effect on Fe-based catalytic FTS.

关键词： Fischer–Tropsch synthesis iron-based catalyst carbon-encapsulation size effect

Hemoglobin within normal range is negatively related to hemoglobin A1c in a nondiabetic American population aged 16 years and older

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World Journal of Diabetes 2022年第3期13卷 251-259页

作者： Xiao-Fang Bai Huan Wang qiao-Ling zhao Department of Ultrasound Medicine The First Affiliated HospitalXi'an Jiaotong UniversityXi'an 710061Shannxi ProvinceChina Department of Pain Medicine The First Affiliated HospitalXi'an Jiao tong UniversityXi'an 710061Shannxi ProvinceChina

BACKGROUND Protein glycosylated hemoglobin,hemoglobin A1c(HbA1c)binds hemoglobin(Hb)in red blood cells to blood ***,the relationship between Hb and HbA1c remains *** To elucidate their relationship in a nondiabetic population aged≥16 years in the United States,using data from the 1999-2018 National Health and Nutrition Examination *** This study was based on data from 44560 adults aged≥16 years,excluding those with *** relationship was estimated using a multivariate *** also used piecewise linear regression for subgroup analysis based on age and sex stratification and analysis of the threshold effects of Hb on *** Hb and HbA1c levels were negatively correlated in the unadjusted model(β=-0.01;95%CI:-0.01,-0.01).The correlation was significantly negative when the regression model was minimally regulated and stratified by age and sex,and remained negative when the model was further regulated(more than 10%)to identify covariates with the HbA1c level influence *** subgroup analyses based on age and sex stratification,the association remained negative when the covariates were controlled.A nonlinear relationship was observed between them when the Hb levels reached the tipping point(13.2 g/dL)(adjusted odds ratio,-0.04;95%CI:-0.05,-0.03)and when the Hb levels exceeded 13.2 g/dL(adjusted odds ratio,-0.10;95%CI:-0.10,-0.09).CONCLUSION Our study shows that normal Hb levels are negatively correlated with HbA1c in nondiabetic Americans aged≥16 years.

关键词： Haemoglobin Glycosylated haemoglobin Diabetes National Health and Nutrition Examination Survey

Crystal structure and some dynamic performances of Ti_(0.25)V_(0.34)Dy_(0.01)Cr_(0.1)Ni_(0.3) hydrogen storage electrode

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Chinese Chemical Letters 2011年第1期22卷 93-96页

作者： Yu Qing qiao Min Shou zhao Qiu Ming Zhang Jing Zhai College of Environmental and Chemical Engineering Yanshan University Qinhuangdao 066004 China

Crystal structure and some dynamic performances of Zi0.25V0.34Dy0.01Cr0.1Ni0.3 hydrogen storage electrode alloy have been investigated by XRD, FESEM-EDS, TEM and EIS measurements. The result shows that the alloy is mainly composed of V-based solid solution phase with body-centered-cubic structure and mono-crystal Ni3Ti phase with hexagonal structure （Space grope： P63/ mmc）, and it was first observed as TiNi-based secondary phase. The higher charge transfer resistance, higher apparent activation energy and lower hydrogen diffusion coefficient are reasons for the poor electrochemical activity of the dehydriding kinetics of Ti- V-Cr-Ni hydride alloy.

关键词： Hydrogen storage electrode alloy Ni-MH battery V-Based solid solution