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Biomaterial nanotopography-mediated cell responses:experiment and modeling

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International Journal of Smart and Nano Materials 2014年第4期5卷 227-256页

作者： lei Yang Haipei Liu yuan Lin Institute of Orthopaedics and Department of Orthopaedic Surgery The First Affiliated HospitalSoochow UniversitySuzhou 215006PR China Department of Mechanical Engineering The University of Hong KongPokfulam RoadHong KongPR China

The rapid development of fabrication and processing technologies in the past two decades has enabled researchers to introduce nanoscale features into materials which,interestingly,have been shown to greatly regulate the behavior and fate of biological *** particular,important cell responses(such as adhesion,proliferation,differentiation,migration,and filopodial growth)have all been correlated with material *** its great potential,intensive efforts have been made,both experimentally and theoretically,to understand why and how cells respond to nanoscale surface features,and this article reviews recent progress in this ***,a brief overview on the fabrication and modification techniques to create nanotopography on different materials is given *** that,a summary of important experimental findings on the mediation of nanoscale surface topography on the behavior of various cells,as well as the underlying mechanism,is ***,both classical and recently developed approaches for modeling nanotopographymediated cell adhesion and filopodial growth are reviewed.

关键词： biomaterials topography cell-material interaction experiment modeling

Selective catalytic reduction of NO_x by hydrogen over modified Pd/TiO_2-Al_2O_3 catalyst under lean-burn conditions

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Chinese Science Bulletin 2014年第31期59卷 3973-3979页

作者： Kaijiao Duan Zhiming Liu lei yuan State Key Laboratory of Chemical Resource Engineering Beijing University of Chemical Technology

A series of Ni,Sn and Ca modified Pd/TiO2-Al2O3catalysts were prepared by the incipient wetness impregnation method and their catalytic performance for the selective catalytic reduction of NOxby H2was *** results showed that the NOxconversion and N2selectivity were improved over Pd-Sn/TiO2-Al2O3and Pd-Ni/TiO2-Al2O3catalysts above 200°*** importantly,the N2selectivity and high-temperature activity of Pd-Sn/TiO2-Al2O3catalyst was far superior to the single Pd/*** optimal Sn loading was 2 wt.%.X-ray diffraction(XRD)results showed that the interaction between Pd and Sn promotes the dispersion of Pd over ***-programmed reduction(H2-TPR)results demonstrated that the addition of Sn contributes to the formation of Pd0and improving the redox property of Pd/*** additives of Ni and Sn also facilitated the absorption of NOxand the oxidation of NO to NO2,which play important roles in the selective catalytic reduction of NOxby hydrogen.

关键词：选择性催化还原氧化铝催化剂 TiO2 NOx PdO 燃烧条件改性 Al2O3

Recent Advances in Flame Retardant Bio-Based Benzoxazine Resins

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Journal of Renewable Materials 2022年第4期10卷 871-895页

作者： Hongliang Ding Xin Wang lei Song yuan Hu State Key Laboratory of Fire Science University of Science and Technology of ChinaHefei230026China

Benzoxazines have attracted wide attention from academics all over the world because of their unique ***,most of the production and preparation of benzoxazine resins depends on petroleum resources now,especially bisphenol A-based ***,owing to the environmental impacts,the development of bio-based benzoxazines is gaining more and more interest to substitute petroleum-based *** to petroleum-based benzoxazines,most of bio-based benzoxazines suffer from ***,it is necessary to endow bio-based benzoxazines with outstanding flame *** purpose of this review is to summarize the latest advance in flame retardant bio-based ***,three methods of the synthesis of bio-based benzoxazines are introduced ***,the curing mechanism of benzoxazine and the effect of branched chains on the curing behavior are also discussed and ***,this review focuses on fully bio-based benzoxazines,partly bio-based benzoxazines,and bio-based benzoxazine composite materials in terms of flame retardancy as well as thermal stability and some other special ***,we give a brief comment on the challenges and prospects of the future development of flame retardant bio-based benzoxazines.

关键词： Bio-based benzoxazine curing mechanism thermal stability flame retardancy

Effect of Cavity Decay on Entanglement of Ladder-Type Three-Level Atoms and a Two-Mode Cavity Field

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Communications in Theoretical Physics 2008年第8期50卷 349-354页

作者： GAO Cheng-yuan LIU Jin-Ming MA lei Institute of Theoretical Physics and Key Laboratory of Optical and Magnetic Resonance Spectroscopy Department ofPhysics East China Normal University Shanghai 200062 China

Considering the adiabatical approximation and the large detuning condition, we give the effective Hamiltonian of a ladder-type three levels atom interacting with a bimodal cavity field. If two identical three-level atoms are sent through the cavity one by one, a two-atom entangled state can be generated. With the choice of the appropriate interaction time, a maximally entangled state of two atoms can be obtained if decoherence effect is ignored. Moreover, we discuss the effect of cavity decay on four physical quantities including atomic population probability, residual entanglement of the first atom and the cavity field, concurrence between the two atoms, and fidelity for generating atomic EPR state, all of which decrease with the increase of cavity decay when the other parameters are fixed.

关键词： cavity decay population probability entangled state concurrence

Removal of rhodamine B from aqueous solution by BiP04 hierarchical architecture

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Frontiers of Environmental Science & Engineering 2013年第3期7卷 382-387页

作者： lei LI Jian XU Changsheng GUO yuan ZHANG State Key Laboratory of Environmental Criteria and Risk Assessment Chinese Research Academy of Environmental Sciences Beijing 100012 China Laboratory of Riverine Ecological Conservation and Technology Chinese Research Academy of Environmental Sciences Beijing 100012 China Jinan Environmental Protection Planning & Design Research Institute Jinan 250001 China

Hexahedron-like BiPO4 microcrystals were sucessfully synthesized via a template-free hydrothermal method. The resulting samples were characterized by X- ray diffraction （XRD）, field-emission scanning electron microscopy （FESEM）, transmission electron microscopy （TEM） and UV-vis spectroscopy. The BiPO4 samples were of pure monoclinic phase, and the initial amount of PO3- during synthesis did not show obvious effect on the phase properties of the materials. The hexahedron-like BiPO4 microcrystal had explicitly cut edges, and its thickness was about 1 gin. The photocatalytic performance of the BiPO4 catalysts was evaluated by photodegradation of RhB under UV light irradiation with commerial Degussa P25 TiO2 as reference. Compared with P25, the BiPO4 catalysts displayed higher photocatalytic activity, with 98.7% of RhB degraded during 60-min experiment. Cost evaluation analysis was adopted to describe the energy consumption of the degradation process, and the results suggested the potential application of this material in the field of dye-contaminated wastewater treatment or environmental matrices remediation.

关键词： BiPO4 photocatalysis Rhodamine B costevaluation

Fecal microbiota of three bactrian camels(Camelus ferus and Camelus bactrianus) in China by high throughput sequencing of the V3-V4 region of the 16S rRNA gene

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Journal of Arid Land 2017年第1期9卷 153-159页

作者： yuan lei QI Aladaer CHENG Yun SAGEN Guli QU yuan LIU Bin Xinjiang Lop Nor Wild Camel National Nature Reserve Urumqi 830011 China Animal Science Department Xinjiang Agricultural University Urumqi 830052 China Key Laboratory of Biogeography and Bioresources in Arid Land Xinjiang Institute of Ecology and Geography Chinese Academy of Sciences Urumqi 830011 China The People's Hospital of Xinjiang Uygur Autonomous Region Urumqi 830001 China

This study aimed to reveal the microbial diversity in the fecal samples of bactrian camels using the 16 S r RNA sequencing analysis on the Illumina Mi Seq platform. Three fecal samples were collected from two geographical regions in China. Operational taxonomic unit（OTU） clustering was performed by identifying an OTU at 97% sequence identity. The alpha and beta diversities were applied to estimate the differences in microbial diversity among the three fecal samples. Totally, 4409, 3151 and 4075 OTUs in the fecal samples were identified in the Lop Nor wild camel（Camelus ferus）, the domestic camel（C. bactrianus） and Dunhuang wild camel（C. ferus）, respectively. The majority of bactreria were affiliated with phylum Firmicutes and Bacteroidetes in the three samples. The wild camels had higher gastrointestinal tract microbial diversity than the domestic one, while the microbial composition of the Lop Nor wild camel shared higher similarity with domestic camel at the genus and family levels than that of the Dunhuang wild camel did. Our results may provide a theoretical basis for assessing their health conditions and may thus be useful for protecting the critically endangered species of C. ferus.

关键词： bactrian camels Camelus ferus fecal microbiota 16S rRNA high-throughput sequencing

Node and Edge Joint Embedding for Heterogeneous Information Network

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BIG DATA MINING AND ANALYTICS 2024年第3期7卷 730-752页

作者： Chen, lei Li, yuan Liu, Hualiang Guo, Haomiao Hunan Univ Sci & Technol Sch Informat & Elect Engn Xiangtan 411201 Peoples R China Changde Water Meter Manufacture Co Ltd Changde 415000 Peoples R China

Due to the heterogeneity of nodes and edges, heterogeneous network embedding is a very challenging task to embed highly coupled networks into a set of low-dimensional vectors. Existing models either only learn embedding vectors for nodes or only for edges. These two methods of embedding learning are rarely performed in the same model, and they both overlook the internal correlation between nodes and edges. To solve these problems, a node and edge joint embedding model is proposed for Heterogeneous Information Networks (HINs), called NEJE. The NEJE model can better capture the latent structural and semantic information from an HIN through two joint learning strategies: type-level joint learning and element-level joint learning. Firstly, node-type-aware structure learning and edge-type-aware semantic learning are sequentially performed on the original network and its line graph to get the initial embedding of nodes and the embedding of edges. Then, to optimize performance, type-level joint learning is performed through the alternating training of node embedding on the original network and edge embedding on the line graph. Finally, a new homogeneous network is constructed from the original heterogeneous network, and the graph attention model is further used on the new network to perform element-level joint learning. Experiments on three tasks and five public datasets show that our NEJE model performance improves by about 2.83% over other models, and even improves by 6.42% on average for the node clustering task on Digital Bibliography & Library Project (DBLP) dataset.

关键词： node embedding edge embedding joint embedding Heterogeneous Information Network (HIN) node embedding edge embedding joint embedding Heterogeneous Information Network (HIN)

Co-templating Ionothermal Synthesis and Crystal Structure of a New Layered Aluminophosphate from a Protic Deep Eutectic Solvent

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Chinese Journal of Chemistry 2016年第4期34卷 419-424页

作者： yuan Li Xiangdong Gong lei Liu Jinxiang Dong Research Institute of Special Chemicals Taiyuan University of Technology Taiyuan Shanxi 030024 China

Protic deep eutectic mixtures are usually composed of organic amine hydrochloride salts and hydrogen bond donors in a specific molar ratio. Ionothermal synthesis of aluminophosphate as an example, herein, was reported for the first time from an urea-based protic eutectic mixture, consisting of diethylammonium chloride （DEACI） and 1,3-dimethyl urea （DMU）. As a result, a new two dimensional aluminophosphate with 4.8-network, [CH3NH3]2[（C2H5）2NH2]Al3（PO4）4, has been successfully synthesized by co-templating the DEA and methylamine in situ generated from the decomposition of DMU in the absence of HF. Compared to alkyl quaternary ammonium salts with more alkyl-group connected with N atom, this kind of organic amine salts are more likely as the struc- ture-directing agents to synthesize aluminophosphates in urea-based deep eutectic mixtures. It was also found that HF is crucial to the phase selectivity, a known compound with chain-like structure was obtained with the single methylamine as a structure-directing agent in the presence of HF. These materials were characterized by powder XRD, SEM, TG-DSC, 13C CP-MAS NMR and CHN analyses.

关键词： structure-directing agent ionothermal synthesis deep eutectic solvent crystal structure

Promotion of microvasculature formation in alginate composite hydrogels by an immobilized peptide GYIGSRG

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Science China Chemistry 2012年第9期55卷 1781-1787页

作者： GUO lei WANG Wei CHEN ZhiPing ZHOU Rong LIU yuan yuan Zhi Key Laboratory of Functional Polymer Materials Ministry of EducatioInstitute of Polymer ChemistryNankai UniversityTianjin 300071China

The ability to create artificial thick tissues is a major tissue engineering problem, requiring the formation of a suitable vascular supply. In this work we examined the ability of inducing angiogenesis in a bioactive hydrogel. GYIGSRG （NH2-Gly-Tyr-Ile- Gly-Ser-Arg-Gly-COOH, GG） has been conjugated to sodium alginate （ALG） to synthesize a biological active biomaterial ALG-GG. The product was characterized by IH NMR, FT-IR and elemental analysis. A series of CaCO3/ALG-GG composite hydrogels were prepared by crosslinking ALG-GG with D-glucono-8-1actone/calcium carbonate （GDL/CaCO3） in different molar ratios. The mechanical strength and swelling ratio of the composite hydrogels were studied. The results revealed that both of them can be regulated under different preparation conditions. Then, CaCO3/ALG-GG composite hydrogel was im- planted in vivo to study the ability to induce angiogenesis. The results demonstrated that ALG-GG composited hydrogel can induce angiogenesis significantly compared with non-modified ALG group, and it may be valuable in the development of thick tissue engineering scaffold.

关键词： GYIGSRG alginate composite hydrogel angiogenesis tissue engineering