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Preparation and application of a novel orotic acid chelating resin for removal of Cu(Ⅱ) in aqueous solutions

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Chinese Chemical Letters 2013年第8期24卷 747-750页

作者： Yue Sun zhi-chao li Yan Xu School of Civil Engineering Southeast University

A novel chelating resin OABA,capable of removing Cu（Ⅱ） from aqueous solution,was synthesized via the reaction of macroporous chloromethylated PS-DVB copolymer beads with orotic *** elemental analysis（EA）,Fourier transform infrared spectroscopy（FT-IR）,and scanning electron microscopy microscope-energy dispersive X-ray spectroscopy（SEM-EDS） were used in the characterization of the synthesized chelating ***,static batch adsorption experiments were conducted at different initial concentrations and *** showed good adsorption capacity for Cu（Ⅱ） and the equilibrium data could be well matched with the Freundlich isotherm *** sodium chloride and calcium chloride in solutions favored the Cu（Ⅱ） ***,the desorption process of Cu（Ⅱ） was tested and over 90%regeneration efficiency for the spent OABA was achieved at ammonia concentrations ranging from 1.0%to 2.0%.The results suggested that OABA would be a potential alternative adsorbent for Cu（Ⅱ）,even with other heavy metal ion treatments of wastewater.

关键词： Orotic acid Chelating resin Cu(Ⅱ) Adsorption

Phase equilibria of low-Ni side in Nb-Ni-Ti system at 1100℃

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Rare Metals 2020年第8期39卷 936-941页

作者： Hong-Xiao li zhi-chao li Yu-Ping Ren Min Jiang Gao-Wu Qin Key Laboratory for Anisotropy and Texture of Materials Ministry of EducationNortheastern UniversityShenyang 110819China

The phase equilibria related to liquid phase in low-Ni side of Nb-Ni-Ti system at 1100℃were investigated through scanning electron microscope(SEM),electron probe micro-analyzer(EPMA),X-ray diffraction(XRD)and differential scanning calorimetry(DSC).The results show that there exists liquid phase in equilibrium with continuous solid solution(Nb,βTi)and compound TiNi in low-Ni side of Nb-Ni-Ti system at 1100℃.The liquid phase region originates from low-Ni side of binary TiNi system and extends to 9.4 at%Nb in isothermal section of Nb-Ni-Ti phase *** solid solubility of Nb in binary compound TiNi is about 10.6 at%.At 1100℃,there exist two three-phase regions consisting of liquid+(Nb,βTi)+TiNi and(Nb,βTi)+TiNi+X_B in Nb-Ni-Ti system,where X_B is the compound with hexagonal structure and composition of 32.8 Nb-44.5 Ni-22.7 *** wide two-phase region(Nb,βTi)+TiNi exists between these two three-phase *** this two-phase region,Ti content in continuous solid solution(Nb,βTi)varies from6.6 at%to 25.7 at%,but Ni content is almost the same,which is about 4.0 at%.The eutectic transformation L■(Nb,βTi)+TiNi takes place at about 1138℃in Nb-Ni-Ti ternary system.

关键词： Nb-Ni-Ti system Phase equilibrium liquid phase Solid solubility

OsPDR20 is an ABCG metal transporter regulating cadmium accumulation in rice

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Journal of Environmental Sciences 2024年第2期136卷 21-34页

作者： He li chao li Di Sun zhi Min Yang Department of Biochemistry and Molecular Biology College of Life SciencesNanjing Agricultural UniversityNanjing 210095China

Cadmium(Cd)is a non-essential toxic heavy metal,seriously posing high environmental risks to human *** genetic resources relevant to functional genes is important for understanding the metal absorption and accumulation in crops and bioremediation of Cd-polluted *** study investigated a functionally uncharacterized ATP binding cassette transporter G family(ABCG)gene encoding a Pleiotropic Drug Resistance 20(PDR20)type metal transporter which is localized to the plasma membrane of ***20 was transcriptionally expressed in almost all tissues and organs in lifespan and was strongly induced in roots and shoots of young rice under Cd *** expression of OsPDR20 in a yeast mutant ycf1 sensitive to Cd conferred cellular tolerance with less Cd *** of OsPDR20 by RNA interference(RNAi)moderately attenuated root/shoot elongation and biomass,with reduced chlorophylls in rice grown under hydroponic medium with 2 and 10μmol/L Cd,but led to more Cd accumulation.A field trial of rice grown in a realistic Cd-contaminated soil(0.40 mg/kg)showed that RNAi plants growth and development were also compromised compared to wild-type(WT),with smaller panicles and lower spikelet fertility but little effect on yield of ***,OsPDR20 suppression resulted in unexpectedly higher levels of Cd accumulation in rice straw including lower leaves and culm and *** results suggest that OsPDR20 is actively involved in Cd accumulation and homeostasis in rice *** increased Cd accumulation in the RNAi plants has the potential application in phytoremediation of Cd-polluted wetland soils.

关键词： Rice ABCG transporter Cadmium accumulation Phytoremediation

Therapeutic effect of secretome from TNF-αstimulated mesenchymal stem cells in an experimental model of corneal limbal stem cell deficiency

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International Journal of Ophthalmology(English edition) 2021年第2期14卷 179-185页

作者： Guo-Hu Di Xia Qi Jing Xu chao-Qun Yu Qi-Long Cao zhi-Jun Xing zhi-chao li School of Basic Medicine Qingdao UniversityQingdao266071Shandong ProvinceChina Shandong Eye Institute Qingdao266071Shandong ProvinceChina Qingdao Haier Biotech Co.Ltd. Qingdao266071Shandong ProvinceChina Qingdao Hospital of Traditional Chinese Medicine(Qingdao Hiser Hospital) Qingdao266033Shandong ProvinceChina Department of Gynecology and Obstetrics Qingdao Municipal HospitalQingdao UniversityQingdao266033Shandong ProvinceChina

AIM:To explore the secretome efficacy in tumor necrosis factor(TNF)-αstimulated mouse mesenchymal stem cells(MSCs)in a murine model of corneal limbal alkali ***:Corneal limbal stem cell deficiency(LSCD)was created in the eyes of male C57 *** conditioned medium from TNF-αstimulated MSCs(MSC-CMT)was applied topically for 4 wk,with basal medium and conditioned medium from MSCs as *** opacification,corneal inflammatory response,and corneal neovascularization(NV)were *** epithelial cell apoptosis,corneal conjunctivation,and inflammatory cell infiltration were assessed with TUNEL staining,CK3 and Muc-5 AC immunostaining,and CD11 b immunofluorescence staining,*** effect of TSG-6 was further evaluated by knockdown with short hairpin RNA(sh RNA).RESULTS:Compared to the controls,topical administration of MSC-CMT significantly ameliorated the clinical symptoms of alkali-induced LSCD,with restrained corneal NV,reduced corneal epithelial cell apoptosis,and inhibition of corneal *** addition,MSC-CMT treatment significantly reduced CD11 b+inflammatory cell infiltration,and inhibited the expression of pro-inflammatory cytokines(IL-1β,TNF-αand IL-6).Furthermore,the promotion of corneal epithelial reconstruction by MSC-CMT was largely abolished by TSG-6 ***:Our study provides evidence that MSCCMT enhances the alleviation of corneal alkali injuries,partially through TSG-6-mediated anti-inflammatory protective ***-CMT may serve as a potential strategy for treating corneal disorders.

关键词： MSC-CMT limbal stem cell deficiency TSG-6

Dual mechanisms of Bcl-2 regulation in IP_(3)-receptor-mediated Ca^(2+)release:A computational study

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Chinese Physics B 2021年第10期30卷 689-697页

作者： Hong Qi zhi-Qiang Shi zhi-chao li Chang-Jun Sun Shi-Miao Wang Xiang li Jian-Wei Shuai Complex Systems Research Center Shanxi UniversityTaiyuan 030006China Shanxi Key Laboratory of Mathematical Techniques and Big Data Analysis on Disease Control and Prevention Shanxi UniversityTaiyuan 030006China School of Mathematical Sciences Shanxi UniversityTaiyuan 030006China Department of Physics and Fujian Provincial Key Laboratory for Soft Functional Materials Research Xiamen UniversityXiamen 361005China State Key Laboratory of Cellular Stress Biology Innovation Center for Cell Signaling Networkand National Institute for Data Science in Health and MedicineXiamen UniversityXiamen 361005China

Inositol 1,4,5-trisphosphate receptors(IP_(3)R)-mediated calcium ion(Ca^(2+))release plays a central role in the regulation of cell survival and ***-2 limits the Ca^(2+)release function of the IP3R through a direct or indirect ***,the two mechanisms are overwhelmingly complex and not completely ***,we convert the mechanisms into a set of ordinary differential *** firstly simulate the time evolution of Ca^(2+)concentration under two different levels of Bcl-2 for the direct and indirect mechanism models and compare them with experimental results available in the ***,we employ one-and two-parameter bifurcation analysis to demonstrate that Bcl-2 can suppress Ca^(2+)signal from a global point of view both in the direct and indirect mechanism *** then use mathematical analysis to clarify that the indirect mechanism is more efficient than the direct mechanism in repressing Ca^(2+)***,we predict that the two mechanisms restrict Ca^(2+)signal ***,our study provides theoretical insights into Bcl-2 regulation in IP_(3)R-mediated Ca^(2+)release,which may be instrumental for the successful development of therapies to target Bcl-2 for cancer treatment.

关键词： Ca^(2+) Bcl-2 bifurcation analysis oscillations

An Immune-Inspired Approach with Interval Allocation in Solving Multimodal Multi-Objective Optimization Problems with Local Pareto Sets

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Computers, Materials & Continua 2024年第6期79卷 4237-4257页

作者： Weiwei Zhang Jiaqiang li chao Wang Meng li zhi Rao College of Computer Science and Technology Zhengzhou University of Light IndustryZhengzhou450001China Technology Research and Development Center Jilin Tobacco Industry Company LimitedChangchun130031China College of Tobacco Science and Engineering Zhengzhou University of Light IndustryZhengzhou450001China Raw Material Department Hongyun Honghe Tobacco(Group)CompanyKunming650202China

In practical engineering,multi-objective optimization often encounters situations where multiple Pareto sets(PS)in the decision space correspond to the same Pareto front(PF)in the objective space,known as Multi-Modal Multi-Objective Optimization Problems(MMOP).Locating multiple equivalent global PSs poses a significant challenge in real-world applications,especially considering the existence of local *** identifying and locating both global and local PSs is a major *** tackle this issue,we introduce an immune-inspired reproduction strategy designed to produce more offspring in less crowded,promising regions and regulate the number of offspring in areas that have been thoroughly *** approach achieves a balanced trade-off between exploration and ***,we present an interval allocation strategy that adaptively assigns fitness levels to each *** strategy ensures a broader survival margin for solutions in their initial stages and progressively amplifies the differences in individual fitness values as the population matures,thus fostering better population ***,we incorporate a multi-population mechanism that precisely manages each subpopulation through the interval allocation strategy,ensuring the preservation of both global and local *** results on 21 test problems,encompassing both global and local PSs,are compared with eight state-of-the-art multimodal multi-objective optimization *** results demonstrate the effectiveness of our proposed algorithm in simultaneously identifying global Pareto sets and locally high-quality PSs.

关键词： Multimodal multi-objective optimization problem local PSs immune-inspired reproduction

Research progress on micro-force measurement of a hydrate particle system

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Petroleum Science 2024年第4期21卷 2169-2183页

作者： Qiang Luo Wei li zhi-Hui liu Feng Wang zhi-chao liu Fu-Long Ning Faculty of Engineering China University of Geosciences (Wuhan) Suzhou Laboratory

It remains a great challenge to understand the hydrates involved in phenomena in practical oil and gas systems. The adhesion forces between hydrate particles, between hydrate particles and pipe walls, and between hydrate particles and reservoir particles are essential factors that control the behaviors of clathrate hydrates in different applications. In this review, we summarize the typical micro-force measurement apparatus and methods utilized to study hydrate particle systems. In addition, the adhesion test results, the related understandings, and the applied numerical calculation models are systematically discussed.

关键词： Clathrate hydrates Hydrate particle Micro-force measurements Adhesion Interactions

Microstructure and dry sliding wear behavior of as-cast TiCp/Ti-1100-0.5Nb titanium matrix composite at elevated temperatures

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China Foundry 2020年第6期17卷 455-463页

作者： chao-zhi li Bin-guo Fu Tian-shun Dong Jin-hai liu Ying-jun Song Xue-bo Zhao Guo-lu li School of Materials Science and Engineering Hebei University of TechnologyTianjin 300130China Tianjin Astronautics Hydraulic Equipment Co. Ltd.Tianjin 300462China

The microstructure and dry sliding wear performance of as-cast TiCp/Ti-1100-0.5Nb composite at 25℃,500℃ and 600℃ were systematically *** show that the solidification matrix microstructure is the typical Widmanst?tten *** eutectic TiC particles are uniformly distributed in the matrix in the form of feathery,long rod and strip-like ***,the interface between TiC and titanium matrix is clear and without any *** wear rate of TiCp/Ti-1100-0.5Nb at 600℃ and 500℃ is reduced by 95.8%and 79.9%,respectively,compared with that of the value of 51.8×10^-6 mm^3·mm^-1 at 25℃.The friction coefficient of the steady-state period at 25℃,500℃,600℃ is 0.48,0.8,1.2,respectively,and the variation extent of the friction coefficient at elevated temperatures is greater than at 25℃.The wear mechanism is changed from the mixture of adhesive wear and abrasive wear to mild oxidation wear with rising *** can also be concluded that the composite possesses excellent high temperature wear *** high-wear resistance of the composite is attributed to the Fe2O3 and *** presence of Fe2O3 and TiO2 reduces the wear rate,increases the friction coefficient,and also improves the range-ability of the friction coefficient.

关键词： titanium matrix composite as-cast microstructure wear behavior wear mechanism

Synergistic effect of Zr and Mo on precipitation and high-temperature properties of Al-Si-Cu-Mg alloys

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China Foundry 2024年第1期21卷 71-81页

作者： chao Gao Bing-rong Zhang Yin-ming li zhi-ming Wang Xiang-bin Meng Faculty of Mechanical Engineering Qilu University of Technology(Shandong Academy of Sciences)Jinan 250353China Hebei Ounai Machinery Mould Co.Ltd. Xingtai 054500HebeiChina

This study focuses on finding a solution to the sharp decline in mechanical properties of Al-Si-Cu-Mg alloys due to rapid coarsening of traditional intermediate phases at high temperature.A new type of modified al oy,to be used in automobile engines at high temperatures,was prepared by adding Zr and Mo into Al-Si-Cu-Mg *** synergistic effects of Zr and Mo on the microstructure evolution and high-temperature mechanical properties were *** show that the addition of Zr and Mo generates a series of intermetallic phases dispersed in the *** can improve the strength of the alloy by hindering dislocation movement and crack *** addition,some nano-strengthened phases show coherent interfaces with the matrix and improve grain *** addition of Mo greatly improves the heat resistance of the *** extremely low diffusivity of Mo enables it to improve the thermal stability of the intermetallic phases,inhibit precipitation during aging,reduce the size of the precipitates,and improve the heat resistance of the alloy.

关键词： Al-Si-Cu-Mg alloy high-temperature properties Zr-Mo-rich intermetallics nano-strengthening phases