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Alloying and magnetic disordering effects on phase stability of Co_(2)YGa(Y=Cr,V,and Ni)alloys:A first-principles study

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Chinese Physics B 2022年第5期31卷 513-526页

作者： chun-mei li Shun-Jie Yang Jin-Ping Zhou College of Physics Science and Technology Shenyang Normal UniversityShenyang 110034China

The alloying and magnetic disordering effects on site occupation,elastic property,and phase stability of Co_(2)Y Ga(Y=Cr,V,and Ni)shape memory alloys are systematically investigated using the first-principles exact muffin-tin orbitals *** is shown that with the increasing magnetic disordering degree y,their tetragonal shear elastic constant C′(i.e.,(C_(11)-C_(12))/2)of the L2_(1) phase decreases whereas the elastic anisotropy A increases,and upon tetragonal distortions the cubic phase gets more and more ***_(2)Cr Ga and Co_(2)VGa alloys with y≥0.2 thus can show the martensitic transformation(MT)from L2_(1)to D0_(22)as well as Co_(2)Ni *** off-stoichiometric alloys,the site preference is controlled by both the alloying and magnetic *** the ferromagnetism state,the excessive Ga atoms always tend to take the Y sublattices,whereas the excessive Co atom favor the Y sites when Y=Cr,and the excessive Y atoms prefer the Co sites when Y=*** Ga-deficient Y=V alloys can also occur the MT at the ferromagnetism state by means of Co or V doping,and the MT temperature TMshould increase with their *** the corresponding ferromagnetism Y=Cr alloys,nevertheless,with Co or Cr substituting for Ga,the reentrant MT(RMT)from D0_(22)to L2_(1)is promoted and then TMfor the RMT should *** alloying effect on the MT of these alloys is finally well explained by means of the Jahn-Teller effect at the paramagnetic *** the ferromagnetism state,it may originate from the competition between the austenite and martensite about their strength of the covalent banding between Co and Ga as well as Y and Ga.

关键词： first-principles martensitic transformation elastic modulus magnetic ordering shape memory alloys

An Efficient Catalyst for the Direct Synthesis of N-Phenylpyrrolidine

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Chinese Chemical Letters 2006年第12期17卷 1540-1542页

作者： chun mei li Zhi li MIAO Lei SHI Qi SUN Yu Hong HE Institute of Chemistry for Functionalized Materials Faculty of Chemistry and Chemical Engineering Liaoning Normal University Dalian 116029 liaoyuan Health School Liaoyuan 136200

N-Phenylpyrrolidine was efficiently synthesized over the mesoporous A1203 catalyst by the reaction of the aniline and 1,4-butylene-glycol at atmospheric pressure. The catalyst exhibited very high activity and selectivity. At the reaction temperature of 300~C, 1,4-butylene glycol conversion attained 100% and the selectivity of N-phenylpyrrolidine could exceed 98%.

关键词： Synthesis of N-phenylpyrrolidine mesoporous A1203 catalyst activity selectivity,aniline 1,4-butylene glycol.

Deep-cryogenic-treatment-induced phase transformation in the Al-Zn-Mg-Cu alloy

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International Journal of Minerals,Metallurgy and Materials 2015年第1期22卷 68-77页

作者： chun-mei li Nan-pu Cheng Zhi-qian Chen Ning Guo Su-min Zeng School of Materials Science and Engineering Central South University School of Materials Science and Engineering Southwest University

An aluminum alloy （Al-Zn-Mg-Cu） subjected to deep cryogenic treatment （DCT） was systematically investigated. The results show that a DCT-induced phase transformation varies the microstructures and affects the mechanical properties of the Al alloy. Both Guinier-Preston （GP） zones and a metastableη′phase were observed by high-resolution transmission electron microscopy. The phenomenon of the second precipitation of the GP zones in samples subjected to DCT after being aged was observed. The viability of this phase transfor-mation was also demonstrated by first-principles calculations.

关键词： aluminum alloys cryogenic treatment phase transformation microstructure

Proteomic analysis of seed germination under salt stress in soybeans

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Journal of Zhejiang University-Science B(Biomedicine & Biotechnology) 2011年第7期12卷 507-517页

作者： Xiao-yan XU Rui FAN Rui ZHENG chun-mei li De-yue YU National Center for Soybean Improvement National Key Laboratory of Crop Genetics and Germplasm Enhancement Nanjing Agricultural University Nanjing 210095 China) Foundation Department Jiangsu Polytechnic College of Agriculture and Forestry Jurong 212400 China) College of life Sciences Ningxia University Yinchuan 750021 China)

Soybean (Glycine max (L.) Merrill) is a salt-sensitive crop,and its production is severely affected by saline ***,the response of soybean seeds to salt stress during germination was investigated at both physiological and proteomic *** salt-tolerant cultivar Lee68 and salt-sensitive cultivar N2899 were exposed to 100 mmol/L NaCl until radicle protrusion from the seed *** both cultivars,the final germination percentage was not affected by salt,but the mean germination times of Lee68 and N2899 were delayed by 0.3 and 1.0 d,respectively,compared with *** response to salt stress,the abscisic acid content increased,and gibberellic acid (GA1+3) and isopentenyladenosine ***-3-acetic acid increased in Lee68,but remained unchanged in *** proteins extracted from germinated seeds were separated using two-dimensional gel electrophoresis (2-DE),followed by Coomassie brilliant blue G-250 *** 350 protein spots from 2-DE gels of pH range 3 to 10 and 650 spots from gels of pH range 4 to 7 were reproducibly resolved,of which 18 protein spots showed changes in abundance as a result of salt stress in both *** matrix-assisted laser desorption ionization-time of flight-mass spectroscopy (MALDI-TOF-MS) analysis of the differentially expressed proteins,the peptide mass fingerprint was searched against the soybean UniGene database and nine proteins were successfully *** and 20S proteasome subunit β-6 were up-regulated in both *** 3-phosphate dehydrogenase,glutathione S-transferase (GST) 9,GST 10,and seed maturation protein PM36 were down-regulated in Lee68 by salt,but still remained at a certain ***,these proteins were present in lower levels in control N2899 and were up-regulated under salt *** results indicate that these proteins might have important roles in defense mechanisms against salt stress during soybean seed germination.

关键词： Proteomics Salt stress Seed germination Soybean

AuNPs/graphene Hybrids-Based Enzyme-Free Plasmonic Immunoassay for Respiratory Syncytial Virus Detection

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Journal of Analysis and Testing 2021年第3期5卷 203-209页

作者： Lei Zhan chun-mei li Peng-Fei Gao Cheng-Zhi Huang Key Laboratory of Luminescence Analysis and Molecular Sensing(Southwest University) Ministry of EducationCollege of Pharmaceutical SciencesSouthwest UniversityChongqing 400715China

Accurate diagnosis of early infections caused by the viral pathogen is a major challenge because patients usually have nonspecific *** development of sensitive,reliable,robust,and rapid laboratory tools is still in high ***,we developed an extremely sensitive and affordable plasmonic immunoassay for respiratory syncytial virus(RSV)detection with the naked eye based on gold nanoparticles(AuNPs)/graphene hybrids combined with metal enhancement *** limit of detection was found to be 1.7 fg/mL,which was 100 times higher than that of the AuNPs-based *** ultrahigh sensitivity could be attributed to the large number of well-dispersed AuNPs deposited on the graphene surface,which had an extremely high relative surface *** signal amplification was achieved by catalytic enlargement of AuNPs with HAuCl_(4)-NH_(2)OH redox ***,the plasmonic immunoassay was successfully used to detect RSV in artificial serum samples,showing great potential in practical applications.

关键词： AuNPs/graphene hybrids Plasmonic immunoassay Signal amplification Respiratory syncytial virus

Preparation and characterization of supramolecular gel suitable for fractured formations

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Petroleum Science 2023年第4期20卷 2324-2342页

作者： Jing-Bin Yang Jin-Sheng Sun Ying-Rui Bai Kai-He Lv Jian li mei-chun li Yue-Cheng Zhu School of Petroleum Engineering China University of Petroleum(East China)Qingdao266580ShandongPR China CNPC Engineering Technology R&D Company limited Beijing102206PR China

The excellent mechanical properties of supramolecular gel could adapt to the complex reservoir environment and had broad application prospects in the field of oil and gas drilling and production *** this paper,a supramolecular gel based on hydrophobic association and hydrogen bonding was prepared by micellar copolymerization,which could be used to plug fractures and pores in *** gel was a gel network system with high performance characteristics formed by self-assembly of non-covalent bond *** rheological properties,mechanical mechanics,temperature resistance and swelling ability of supramolecular gel were *** results showed that the supramolecular gel had a dense three-dimensional network structure with open and interconnected pore structures,which could exhibit good rheological properties and strong viscoelastic recovery *** mechanical properties of the supramolecular gel were excellent,it had a tensile stress of 0.703 MPa and an elongation at break of 1803%.When the compressive strain was 96%,the compressive stress could reach 14.5 *** gel also showed good temperature resistance and swelling *** the aging temperature of 135℃,supramolecular gels still maintained good gel strength,and it only took 12 h to reach the equilibrium swelling ratio of 35.87 in 1%NaCl *** was also found that supramolecular gel in low concentration saline(1%NaCl solution)showed relatively faster swelling than high concentration saline(25%NaCl solution).The swelling process of the supramolecular gel was non-Fick diffusion(typeⅡ).This indicated that the organic/inorganic permeability network was well ***,the diffusion rate of small molecules could be guaranteed to be equal to the relaxation rate of large molecules before and after the phase transition *** addition to the diffusion of water molecules,the swelling process of the supramolecular gel was also affected by the relaxat

关键词： Supramolecular gel Non-covalent interaction Rheological mechanics properties Swelling kinetics Plugging ability

Effect of pressure on the elastic properties and optoelectronic behavior of Zn_4B_6O_(13): First-principles investigation

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Chinese Physics B 2018年第5期27卷 430-439页

作者： Pei-Da Wang Zhen-Yuan Jia Yu-Han Zhong Hua-Yue mei chun-mei li Nan-Pu Cheng Faculty of Materials and Energy Southwest University Chongqing 400715 China

The hydrostatic-pressure-dependent mechanical stability and optoelectronic behavior of Zn_4B_6O_（13）（ZBO） are calculated using the exchange-correlation functional Perdew–Burke–Ernzerhof generalized gradient approximation and the hybrid functional PBE0 based on density functional theory. The calculated and experimental unit cell volumes and Vickers hardness of ZBO at zero pressure agree well. ZBO is mechanically stable under the critical pressure of 52.98 GPa according to the generalized stability criteria. Furthermore, Young＇s modulus and Vickers hardness decrease with increasing hydrostatic pressure. The strength and type of ZBO bonds are investigated by population and electron density difference. The electronic structure at zero pressure reveals that ZBO is an indirect band gap semiconductor, and the calculated 5.62-e V bandgap coincides well with the 5.73-e V experimental value, highlighting the success of the hybrid functional PBE0 calculations of electronic properties. The band gap almost increases as a second-order polynomial of pressure, and the indirect nature does not change with the applied external pressure. The optical reflectivity and absorption coefficient show that ZBO is an excellent ultraviolet photodetector. Our calculation results suggest that the elastic and optical properties of ZBO are highly stable over a wide pressure range.

关键词： Zn4B6O13 crystal density functional theory elastic properties optical properties

Anti-hepatoma Effect of DC2.4 Cells Transfected with Tumor-Associated Antigen Cdc25C In Vitro

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Current Medical Science 2022年第3期42卷 491-497页

作者： chun-mei li Yan-fei li lin TIAN Qi-hui ZHANG Fang-yuan ZHENG Fa-rong MO School of Basic Medical Science Guangxi Medical UniversityNanning 530021China Laboratory of Hepatobiliary and Pancreatic Surgery Affiliated Hospital of Guilin Medical UniversityGuilin 541001China Guangxi Colleges and Universities Key Laboratory of Human Development and Disease Research Guangxi Medical UniversityNanning 530021China

Objective Cell division cyclin 25 homolog C(Cdc25C)is a tumor-associated antigen candidate gene,and this may be used as an effective target in cancer *** present study aims to evaluate the lysis effect of cytotoxic T lymphocytes(CTLs)induced by dendritic cell line DC2.4 overexpressing Cdc25C,and the feasibility of Cdc25C as a component in hepatoma *** The mouse Cdc25C gene was ligated into a lentiviral vector,and transfected into DC2.4 *** DC2.4 cell phenotype and cytokine secretion were determined by flow cytometry and EliSA,***8^(+)T cells were sorted from the spleens of C57BL/6 mice using a magnetic bead sorting kit obtained from Miltenyi Biotech,Germany,and co-cultured with DC2.4 cells for one week as effector ***,IL-2,granzyme B and perforin were detected in the CTL culture medium by ***,time-resolved fluorescence immunoassay was used to detect the immune killing effect of Cdc25C-specific CTLs on target ***,the effect of blocking MHC-I sites on target cells with a monoclonal anti-MHC-I antibody was *** The results revealed that Cdc25C could be stably overexpressed in DC2.4 cells by LV-Cdc25C ***2.4 cells transfected with LV-Cdc25C secreted more IL-6,IL-12,TNF-αand IFN-γ,and had higher expression levels of CD40,CD86,CCR7 and MHC-II than unaltered DC2.4 *** elevated Cdc25C in dendritic cells also further increased the secretion of IL-2,granzyme B and perforin to elicit Cdc25C-specific CTLs,and induced the higher cytotoxicity in Hepa1-6 cell lines(P<0.05),but this had no effect on the target cells when MHC-I monoclonal antibodies were *** DC2.4 cells transfected with LV-Cdc25C can induce specific CTLs,and result in a strong cellular immune *** dendritic cells that overexpress Cdc25C may be useful for hepatoma immunotherapy.

关键词： dendritic cells cell division cyclin 25 homolog C cytotoxic T lymphocytes hepatocellular carcinoma anti-hepatoma

Magnetic Bead‑Based Sandwich Immunoassay for Viral Pathogen Detection by Employing Gold Nanoparticle as Carrier

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Journal of Analysis and Testing 2017年第4期1卷 298-305页

作者： Lei Zhan Wen Bi Wu chun mei li Cheng Zhi Huang Key Laboratory on Luminescence and Real‑Time Analytical Chemistry(Ministry of Education) College of Pharmaceutical ScienceSouthwest UniversityChongqing 400716China Chongqing Key Laboratory of Biomedical Analysis(Chongqing Science&Technology Commission) College of Chemistry and Chemical EngineeringSouthwest UniversityChongqing 400715China

Enzyme-linked immunosorbent assay(EliSA)provides a convenient way for the detection of viral ***,conventional EliSA performed on mirowell plates suffers from poor sensitivity,laborious coating and complicated blocking ***,we designed a sensitive colorimetric immunoassay by taking advantages of the enrichment and isolation ability of magnetic beads(MBs)and the high loading capacity of gold nanoparticles(AuNPs)for detecting respiratory syncytial virus(RSV)as a pathogen *** was selectively captured and preconcentrated from samples with antibodies functionalized MBs,followed by binding with antibodies labeled AuNPs,which carrying a large amount of alkaline phosphatase(ALP)molecules for colorimetric signal amplification by catalyzing the dephosphorylation of non-colored pNPP to generate colored product *** optimizing the experimental conditions based on the principle of low nonspecific signal,low cost,and high sensitivity,the analytical sensitivity of the developed immunoassay can be improved to 0.27 pg/mL,which is over sevenfold higher than that of commercially available RSV EliSA kits(2 pg/mL).In addition,the total assay time was less than 2.5 h without any pretreatment,which is much more rapid than other reported ***,the proposed immunoassay holds great promise for the fabrication of rapid,sensitive,and economic method for the viral pathogen detection.

关键词： Magnetic bead Gold nanoparticles Enzyme immunoassay Signal amplification Respiratory syncytial virus