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Hierarchically porous N-doped carbon derived from biomass as oxygen reduction electrocatalyst for high-performance Al–air battery

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Journal of Energy Chemistry 2020年第6期29卷 119-125,I0005页

作者： Yanqiu wang Jiayu Hao Jiawen Yu Hongjian Yu keke wang Xuetao Yang Jie Li Wenzhang Li School of Chemistry and Chemical Engineering Central South UniversityChangsha 410083HunanChina Hunan Provincial Key Laboratory of Efficient and Clean Utilization of Manganese Resources Central South UniversityChangsha 410083HunanChina

Developing large-scale and highly efficient oxygen reduction reaction(ORR)catalysts acts a vital role in realizing wide application of metal–air ***,we propose a gas-foaming strategy to fabricate sustainable and 3D hierarchically porous N-doped carbon with high specific surface area and abundant defects sites derived from *** obtained catalyst exhibits prominent ORR property with higher half-wave potential(0.861 V)and slightly lower kinetic current density(32.44 m A cm^-2),compared to Pt/C(0.856 V and 43.61 m A cm^-1).Furthermore,employing it as catalyst of air cathode,the Al–air battery delivers remarkable discharge performance with excellent power density of 401 m W cm^-2,distinguished energy density of 2453.4 Wh kg^-1 and extremely high open-circuit voltage of 1.85 V among the reported metal–air batteries in the *** gas-foaming strategy for full utilization of biomass affords a chance to explore scalable advanced catalysts in metal–air battery.

关键词： Gas-foaming strategy Biomass Hierarchically porous structure Oxygen reduction reaction Al–air battery

Injectable silk/hydroxyapatite nanocomposite hydrogels with vascularization capacity for bone regeneration

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Journal of Materials Science & Technology 2021年第4期63卷 172-181页

作者： keke wang Weinan Cheng Zhaozhao Ding Gang Xu Xin Zheng Meirong Li Guozhong Lu Qiang Lu College of Chemistry Chemical Engineering and Materials Science&Collaborative Innovation Center of Suzhou Nano Science and TechnologySoochow UniversitySuzhou 215123China Department of Burns and Plastic Surgery The Affiliated Hospital of Jiangnan UniversityWuxi 214041China Department of Orthopedics The First Affiliated Hospital of Xiamen UniversityXiamen 361000China Department of Orthopedics The Second Affiliated Hospital of Soochow UniversitySuzhou 215000China Institute of Basic Medical Science Wound Healing and Cell Biology LaboratoryChinese PLA General HospitalBeijing 100853China

Localized and sustained osteogenic-angiogenic stimulation to bone defects is critical for effective bone ***,desferrioxamine(DFO)was loaded on silk fibroin nanofibers and blended with hydroxyapatite nanorods(HA),forming injectable DFO-loaded silk fibroin-HA nanocomposite *** composite hydrogels remained homogeneous distribution of HA with high ratio(60%)and also higher stiffness than that of pure silk fibroin nanofiber hydrogels,which provided stable osteogenic stimulation niches for tissue *** the scarify of injectability,the hydrogels achieved slow delivery of DFO for above 60 days,resulting in suitable angiogenesis in vitro and in vivo and better osteogenesis than DFO-free *** to previous injectable silk fibroin-HA hydrogels,the introduction of vascularization capacity further stimulated the osteogenic differentiation of stem cells and accelerated new bone *** and better bone healing were detected at defect sites after the injection of DFO-loaded nanocomposite hydrogels,indicating the effective synergistic effect of osteogenic and angiogenic *** work provides a simple and effective strategy of introducing angiogenic cues to bone *** believe that the injectable nanocomposite hydrogels are suitable for the regeneration of bone tissues.

关键词： hydrogel loaded synergistic

Ontology-Driven Discovering Model for Geographical Information Services

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Geo-Spatial Information Science 2010年第1期13卷 24-31页

作者： ZHANG Lichao wang keke PAN Zhen wang Qingshan ZHENG Haiying Institute of Surveying and Mapping Information Engineering University 66 Longhai Road Zhengzhou 450052 China First the Management Committee ttigh & New Technology Industrial Development Zone of Zhengzhou 6 Guohuai Road Zhengzhou 450001 China

This paper proposes an ontology-driven discovering model for the geographical information services to improve their recall ratio and precision ratio. This model uses the geographical information service ontology. In this paper, first we study the multilevel matching arithmetic of geographical information services. This arithmetic is used for filtering and matching the services in the service register center according to the similarity between services selected and services requested from the definition of the function similarity and credit standing similarity. The matching arithmetic, geographical information service ontology and semantic description constitute the discovering model. Finally, we test and analyze the model from the recall ratio, precision ratio, responsivity and load balance. The result indicates that the ontology-driven discovering model is excellent in recall ratio and precision ratio, and can maintain the dynamic load balance of service copy.

关键词： ontology-driven service discovering function similarity credit similarity recall ratio precision load balance

Strain‑Induced Surface Interface Dual Polarization Constructs PML‑Cu/Bi_(12)O_(17)Br_(2) High‑Density Active Sites for CO_(2) Photoreduction

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Nano-Micro Letters 2024年第5期16卷 169-183页

作者： Yi Zhang Fangyu Guo Jun Di keke wang Molly Meng‑Jung Li Jiayu Dai Yuanbin She Jiexiang Xia Huaming Li School of Chemistry and Chemical Engineering Institute for Energy ResearchSchool of the Environment and Safety EngineeringJiangsu UniversityZhenjiang 212013People’s Republic of China State Key Laboratory Breeding Base of Green Chemistry‑Synthesis Technology College of Chemical EngineeringZhejiang University of TechnologyHangzhou 310014People’s Republic of China College of Science and Hunan Key Laboratory of Extreme Matter and ApplicationsNational University of Defense TechnologyChangsha 410073People’s Republic of China Department of Applied Physics The Hong Kong Polytechnic UniversityHung HomHong KongPeople’s Republic of China School of Chemistry and Chemical Engineering National Special Superfine Powder Engineering Research CenterNanjing University of Science and TechnologyNanjing 210094People’s Republic of China Key Laboratory of the Ministry of Education for Advanced Catalysis Materials Zhejiang Normal UniversityJinhua 321004People’s Republic of China

The insufficient active sites and slow interfacial charge trans-fer of photocatalysts restrict the efficiency of CO_(2) *** synchronized modulation of the above key issues is demanding and ***,strain-induced strategy is developed to construct the Bi–O-bonded interface in Cu porphyrin-based monoatomic layer(PML-Cu)and Bi_(12)O_(17)Br_(2)(BOB),which triggers the surface interface dual polarization of PML-Cu/BOB(PBOB).In this multi-step polarization,the built-in electric field formed between the interfaces induces the electron transfer from con-duction band(CB)of BOB to CB of PML-Cu and suppresses its reverse ***,the surface polarization of PML-Cu further promotes the electron converge in Cu *** introduction of PML-Cu endows a high density of dispersed Cu active sites on the surface of PBOB,significantly promoting the adsorption and activation of CO_(2) and CO *** conversion rate of CO_(2) photoreduction to CO for PBOB can reach 584.3μmol g-1,which is 7.83 times higher than BOB and 20.01 times than *** work offers valuable insights into multi-step polarization regulation and active site design for catalysts.

关键词： Bi_(12)O_(17)Br_(2) Porphyrin CO_(2)photoreduction Polarization Active sites

Platelet-derived microparticles and their cargos: The past, present and future

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Asian Journal of Pharmaceutical Sciences 2024年第2期19卷 72-88页

作者： Jingwen Guo Bufeng Cui Jie Zheng Chang Yu Xuran Zheng Lixin Yi Simeng Zhang keke wang Department of Pharmacy The First Hospital of China Medical UniversityShenyang 110001 China School of Pharmacy China Medical UniversityShenyang 110122China Key Laboratory of Medical Cell Biology of Ministry of Education Key Laboratory of Major Chronic Diseases of Nervous System of Liaoning ProvinceHealth Sciences Institute of China Medical UniversityShenyang 110122China Department of Pharmacy The Fourth Affiliated Hospital of China Medical UniversityShenyang 110032China Department of Medical Oncology the First Hospital of China Medical UniversityShenyang 110001China

All eukaryotic cells can secrete extracellular vesicles, which have a double-membrane structure and are important players in the intercellular communication involved in a variety of important biological processes. Platelets form platelet-derived microparticles (PMPs) in response to activation, injury, or apoptosis. This review introduces the origin, pathway, and biological functions of PMPs and their importance in physiological and pathological processes. In addition, we review the potential applications of PMPs in cancer, vascular homeostasis, thrombosis, inflammation, neural regeneration, biomarkers, and drug carriers to achieve targeted drug delivery. In addition, we comprehensively report on the origin, biological functions, and applications of PMPs. The clinical transformation, high heterogeneity, future development direction, and limitations of the current research on PMPs are also discussed in depth. Evidence has revealed that PMPs play an important role in cell-cell communication, providing clues for the development of PMPs as carriers for relevant cell-targeted drugs. The development history and prospects of PMPs and their cargos are explored in this guidebook.

关键词： Platelet-derived particles Application Heter ogeneity Potential and limitations

Hypoxia-stressed cardiomyocytes promote early cardiac differentiation of cardiac stem cells through HIF-1α/Jagged1/Notch1 signaling

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Acta Pharmaceutica Sinica B 2018年第5期8卷 795-804页

作者： keke wang Ranran Ding Yanping Ha Yanan Jia Xiaomin Liao Sisi wang Rujia Li Zhihua Shen Hui Xiong Junli Guo Wei Jie Department of Pathology Guangdong Medical University Department of Pathology Union Hospital Tongji Medical College Huazhong University of Science and Technology Cardiovascular Institute of First Affiliated Hospital Hainan Medical University

Hypoxia is beneficial for the differentiation of stem cells transplanted for myocardial injury,but mechanisms underlying this benefit remain unsolved. Here, we report the impact of hypoxia-induced Jagged1 expression in cardiomyocytes(CMs) for driving the differentiation of cardiac stem cells(CSCs).Forced hypoxia-inducible factor 1α(HIF-1α) expression and physical hypoxia(5% O_2) treatment could induce Jagged1 expression in neonatal rat CMs. Pharmacological inhibition of HIF-1α by YC-1 attenuated hypoxia-promoted Jagged1 expression in CMs. An ERK inhibitor(PD98059), but not inhibitors of JNK(SP600125), Notch(DAPT), NF-κB(PTDC), JAK(AG490), or STAT3(Stattic) suppressed hypoxiainduced Jagged1 protein expression in CMs. c-Kit^+ CSCs isolated from neonatal rat hearts using a magnetic-activated cell sorting method expressed GATA4, SM22α or vWF, but not Nkx2.5 and ***, 87.3% of freshly isolated CSCs displayed Notch1 receptor expression. Direct co-culture of CMs with BrdU-labeled CSCs enhanced CSCs differentiation, as evidenced by an increased number of BrdU^+/Nkx2.5^+ cells, while intermittent hypoxia for 21 days promoted co-culture-triggered differentiation of CSCs into CM-like cells. Notably, YC-1 and DAPT attenuated hypoxia-induced *** results suggest that hypoxia induces Jagged1 expression in CMs primarily through ERK signaling,and facilitates early cardiac lineage differentiation of CSCs in CM/CSC co-cultures via HIF-1α/Jagged1/Notch signaling.

关键词： Cardiac stem cell Cardiomyocyte,Co-culture Hypoxia Notch1 signaling Cell differentiation

A thiophene-containing covalent triazine-based framework with ultramicropore for CO2 capture

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Journal of Energy Chemistry 2017年第5期26卷 902-908页

作者： keke wang Yuanzhe Tang Qin Jiang Youshi Lan Hongliang Huang Dahuan Liu Chongli Zhong State Key Laboratory of Organic-Inorganic Composites Beijing University of Chemical TechnologyBeijing 100029China State Key Laboratory of Separation Membranes and Membrane Processes Tianjin Polytechnic UniversityTianjin 300387China Beijing Advanced Innovation Center for Soft Matter Science and Engineering Beijing University of Chemical TechnologyBeijing 100029China

In this work, a 2D covalent triazine-based framework was prepared by using 1,3-dicyanobenzo[c]thiophene（DCBT） as monomer to effectively capture CO. The resulting CTF-DCBT was characterized by FT-IR, XPS, PXRD, elemental analysis, SEM, TEM, and *** results indicate that CTF-DCBT is partially crystalline and has ultramicropore（6.5 A?） as well as high heteroatom contents（11.24 wt% and 12.61 wt% for N and S, respectively）. In addition, the BET surface area and total pore volume of CTF-DCBT are 500 m/g and 0.26 cm/g, respectively. CTF-DCBT possesses excellent thermal stability（450 °C） and chemical stability towards boiling water, 4 M HCl, and 1 M Na *** COadsorption capacity of CTF-DCBT is 37.8 cm/g at 1 bar and 25 °C. After six adsorption-desorption cycles, there is no obvious loss of COuptake observed. Due to the ultramicropore and high heteroatom contents, CTF-DCBT has high isosteric heats of adsorption for COand high selectivities of COover Nand CH. At 25 °C, the CO/Nand CO/CHselectivities are 112.5 and 10.3, respectively, which are higher than those of most POFs. Breakthrough curves indicate that CTF-DCBT could effectively separate CO/Nand CO/CHmixtures.

关键词： Covalent triazine-based framework Ultramicropore Adsorption Carbon dioxide

The activity and kinetic properties of cellulases in substrates containing metal ions and acid radicals

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Advances in Biological Chemistry 2012年第4期2卷 390-395页

作者： Ge wang Xiaowen Zhang Li wang keke wang Fanglin Peng Linsong wang College of Life Science Henan Normal University Xinxiang China

The effects of various metal ions (Na+, K+, Ca2+, Mg2+, Al3+, Co2+) and anions (Cl–, SO2-4 and CH3COO–) on two cellulases were investigated. Fitting of the data to Michaelis-Menten kinetics showed that Al3+ noncom-petitively inhibited cellulase (Km = 22.68 g/L;Vmax = 0.269 mg/min at 5.0 mmol/L AlCl3) and Mg2+ competitively inhibited cellulase (Km = 50.0 g/L;Vmax = 0.434 mg/min at 10.0 mmol/L MgCl2) Different metal ions increased or decreased inhibition of cellulase activity slightly below 1 mmol/L and strongly over 10 mmol/L. The results indicated that filter paper activeity (FPA) was suitable for analysis of enzymatic saccharification with various lignocellulosic substrates whereas crude cellulase was suitable for applications in the biomass industry. Some metal ions were proved to inhibit cellulase reversibly.

关键词： Cellulase Enzyme Activity Enzyme Deactivation Kinetics Parameters Metal Ions Anions

Suspension Friction Mechanism Study and Friction Optimization

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Suspension Friction Mechanism Study and Friction Optimizatio...