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In vitro and in vivo evaluation of micro-alloyed magnesium for potential application in alveolar bone fixation screws

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Journal of Materials Science & Technology 2023年第13期144卷 62-69页

作者： Hongyan Tang qing li Min li Xuenan Gu Chengkung Cheng Yubo Fan Key Laboratory of Biomechanics and Mechanobiology(Beihang University) Ministry of EducationBeijing Advanced Innovation Center for Biomedical EngineeringSchool of Biological Science and Medical EngineeringBeihang UniversityBeijing 100083China Center of Digital Dentistry Peking University School and Hospital of StomatologyBeijing 100081China National Engineering Research Center of Oral Biomaterials and Digital Medical Devices Beijing 100081China School of Biomedical Engineering Shanghai Jiao Tong UniversityShanghai 200030China

Alveolar bone augmentation with fixation screws has difficulties such as non-degradable materials that could lead to secondary surgery and insufficient osseointegration due to the subgingival environment in dental *** degradability and a high degree of osteogenesis,Mg alloy is a successful biodegrad-able material for orthopedic applications,and its application in dentistry has made certain ***-ever,considering the unique subgingival healing properties of oral implants,there is still a gap between the desired material properties for clinical applications and available ***,studies on the use of Mg-based fixation screws for dentistry applications are still *** this study,we reported a magnesium alloy with low combined addition of strontium and *** mechanical properties,degradation behavior,osteogenesis,and gingival compatibility were systematically investigated for assess-ing its potential application in alveolar bone fixation *** the alloying element content restricted to 0.3 wt.%,Mg-Sr-La alloy still exhibited good mechanical properties,with yield tensile and compressive strength twice higher than those of pure *** in vitro degradation rate of this alloy was 0.10 mm y-1,which was slightly slower than high-purity *** indirect and direct cell assay confirmed the elevated osteoblastic differentiation of MC3T3-E1 and migration of HGF-1 ***,Mg-Sr-La alloy demon-strated a relatively slow degradation in the maxillary bone of Beagles.A remarkable promotion of the bone-implant contacts and significantly decreased fibrous encapsulation was observed in the subgingival environment,implying superior osseointegration of the experimental alloy than the titanium *** empirical findings here reveal the great potential of Mg-Sr-La alloy for the application in alveolar bone fixation devices.

关键词： Magnesium alloys Alveolar ridge augmentation Fixation screws Osseointegration

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Resistance and biosorption mechanism of silver ions by Bacillus cereus biomass

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Journal of Environmental Sciences 2011年第1期23卷 108-111页

作者： li li qing Hu Jinghai Zeng Hongyan Qi Guoqiang Zhuang Research Center for Eco-Environmental Sciences Chinese Academy of Sciences Beijing 100085 China

Biosorption of silver ions onto Bacillus cereus biomass was investigated. Overall kinetic experiments were performed for the determination of the necessary contact time for the attainment of equilibrium. It was found that the overall biosorption process was best described by pseudo second-order kinetic model. The crystals detected by scanning electron microscope and X-ray photoelectron spectroscopy suggested the precipitation was a possible mechanism of biosorption. The molecular genetics of silver resistance of B. cereus biomass was also detected and illustrated by a whole cell sensor tool.

关键词： Bacillus cereus biosensor biosorption crystal isotherms kinetics silver

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Sr2+-doped rhombohedral liHf2(PO4)3 solid electrolyte for allsolid-state li-metal battery

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Rare Metals 2020年第9期39卷 1092-1098页

作者： qing-Hui li Chang Xu Bing Huang Xin Yin College of Electrical and Information Engineering Hunan UniversityChangsha 410082China State Key Laboratory of New Ceramics and Fine Processing School of Materials Science and EngineeringTsinghua UniversityBeijing 100084China School of Materials Science and Engineering Tianjin UniversityTianjin 300072China

Solid-state electrolytes in rechargeable all-solidstate li-metal batteries,which have better safety and higher specific capacity than conventional rechargeable liion batteries with liquid electrolytes,are limited by the low li-ion conductivity of the solid electrolyte and the large electrolyte/electrode interfacial ***,we report a new rhombohedral NAS ICON structure li1.4Sr0.2Hf1.8(PO4)3 with a high li-ion conductivity of 1.62×10-5 S·cm-1 at 25℃,and its conductivity can be improved to 3.4×10-5 S·cm-1 after the densification of the pellet by hot ***1.4Sr0.2Hf1.8(PO4)3 coated by a thin layer of polymer electrolyte showed a stable lowimpedance dendrite-free plating/stripping process in a symmetric li/li cell for 100 h;moreover,the li1.4Sr0.2Hf1.8(PO4)3 electrolyte had a small interfacial resistance in all-solid-state li/liFePO4 cell,which allows a high Coulombic efficiency and good cycling of the cell.

关键词： Solid-state electrolyte NASICON Rhombohedral phase Interfacial resistance All-solid-state battery

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Relationship Between Differential Interference Angle and Parameter of Experiment in Molecular Beam

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Communications in Theoretical Physics 2006年第2X期46卷 294-296页

作者： li Yong-qing li Jian MA Feng-Cai Department of Physics Liaoning University Shenyang 110036 China

Collisional quantum interference （CQI） was observed in the intramolecular rotational energy transfer in the experiment of the static cell, and the integral interference angles were measured. To observe more precise information, the experiment in the molecular beam should be taken,from which the relationship between the differential interference angle and the scattering angle can be obtained. In this paper, the theoretical model of CQI is described in an atom-diatom system in the condition of the molecular beam, based on the first-Born approximation of time-dependent perturbation theory, taking into accounts the long-range interaction potential. The method of observing and measuring correctly the differential interference angle is presented. The changing tendency of the differential interference angle with the impact parameter and relative velocity is discussed. The changing tendencies of the differential interference angle with the parameter of experiment in the molecular beam, including the impact parameter and the velocity are discussed. This theoretical model is important to understand or perform the experiment in the molecular beam.

关键词： differential interference angle quantum interference rotational energy transfer

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Electrochemical properties of Ca-Pb electrode for calcium-based liquid metal batteries

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International Journal of Minerals,Metallurgy and Materials 2020年第12期27卷 1723-1729页

作者： Xiao-hui Ning Chen-zheng liao Guo-qing li Center for Advancing Materials Performance from the Nanoscale(CAMP-Nano) State Key Laboratory for Mechanical Behavior of MaterialsXi'an Jiaotong UniversityXi'an 710049China

The Ca-Pb electrode couple is considered to be one of the least expensive(~36$/(k W·h))among various optional materials for liquid-metal batteries(LMBs).The electrochemical properties of Ca-Pb alloy in a Ca|li Cl-Na Cl-Ca Cl_(2)|Pb cell were investigated in this *** electrode potential maintained a linear relationship in the current density range of 50-200 m A·cm^-2,which indicates that the alloying and dealloying processes of Ca with Pb attained rapid charge transfer and mass transport in the interface between the liquid electrode and *** Ca-Pb electrode exhibited remarkable properties with a high discharge voltage of 0.6 V,a small self-discharge current density(98.84%).The postmortem analysis showed that intermetallics Ca Pb3 and Ca Pb were uniformly distributed in the electrode with different molar fractions of Ca,which indicates that the nucleation of solid intermetallics did not hinder the diffusion of Ca in the *** investigation on Ca-Pb electrode sheds light on the further research and the design of electrodes for Ca-based LMBs.

关键词： liquid-metal battery molten salt electrolyte Ca-Pb alloys electrochemical properties

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The holographic fermions dual to massive gravity

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Science China(Physics,Mechanics & Astronomy) 2016年第10期59卷 49-57页

作者： li-qing Fang[[ Xiao-Mei Kuang Jian-Pin Wu School of Physics and Electronic Information Shangrao Normal UniversityShangrao 334000China Department of Physics and Astronomy Shanghai Jiao Tong UniversityShanghai 200240China Shanghai Key Laboratory of High Temperature Superconductors Shanghai 200444China Instituto de Fisica Pontificia Universidad Catolica de ValparaisoCasilla 4059ValparaisoChile Institute of Gravitation and Cosmology Department of PhysicsSchool of Mathematics and PhysicsBohai UniversityJinzhou 121013China

We investigate the properties of the spectral function of the fermionic operator in the field theory which is dual to a 4-dimensional massive gravity. We first study the Fermi surface and the dispersion relation in the dual boundary theory. We find that as the massive parameters is decreased, the Fermi momentum becomes lower and the low energy excitation near Fermi surface behaves more like non-Fermi liquid. Then, we introduce a dipole coupling in the bulk theory and explore the emergence of a gap in the fermionic spectral function. It is found that larger critical dipole coupling is needed to open the gap than that in Einstein gravity. Accordingly,in the field theory dual to massive gravity, it requires stronger negative dipole coupling to generate the marginal Fermi liquid.

关键词： holography duality AdS/CFT correspondence holographic fermions

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Diagnosing Helicobacter pylori infection in vivo by novel endoscopic techniques

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World Journal of Gastroenterology 2014年第28期20卷 9314-9320页

作者： Rui Ji Yan-qing li Department of Gastroenterology Shandong University Qilu Hospital

Infection with Helicobacter pylori(***)is a worldwide *** observation of *** infection in vivo would be helpful to obtain an immediate *** aim of this review is to describe recent advances in endoscopic technology and to review the available literature pertaining to its clinical application in *** *** visualization of *** infection is not always feasible using conventional ***,advanced endoscopic techniques have been developed with the aim of providing a precise and‘‘real-time’’endoscopic ***,new endoscopic techniques such as magnifying endoscopy,narrow band imaging,I-Scan,endocytoscopy and endomicroscopy help focus examination of the stomach to diagnose disease in a time-efficient manner,and the analysis of mucosal surface details is beginning to resemble histologic *** new detailed images have enabled endoscopists to observe microscopic structures,such as gastric pit patterns,microvessels and cell ***,endoscopic prediction of *** infection is possible by analysis of surface architecture of the mucosa,which influences the clinical *** endoscopic techniques might lead us to easier diagnosis and treatment of *** diseases.

关键词： Helicobacter pylori Diagnosis Gastrointestinal endoscopy

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Purification and Trypsin Inhibitor Activity of a Sporamin B from Sweet Potato (Ipomoea batatas Lam. 55-2)

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Agricultural Sciences in China 2009年第7期8卷 808-820页

作者： SUN Yan-li SUN Jun-mao li qing-peng Institute of Agro-Food Science ＆ Technology Chinese Academy of Agricultural Sciences/Key Laboratory of Agricultural Product Processing and Quality Control Ministry of Agriculture Beijing 100193 P.R.China Agricultural Information Institute Chinese Academy of Agricultural Sciences Beijing 100081 P.R.China

Sporamin is a soluble protein in sweet potato, and falls into two distinct homology groups, subfamilies A and B. In this research, a sporamin B was purified and its amino acid sequences, trypsin inhibitor activity （Ti activity） were analyzed. This sporamin B was isolated from sweet potato tubers [Ipomoea batatas （L.） Lam cv. 55-2] through extraction of the water-soluble fraction, dialysis, ultrafiltration and ion-exchange chromatography. Homology determined by polyacrylamide gel electrophoresis showed that mainly one bond appeared in gel after being reduced by SDS （sodium dodecyl sulfate）, or by SDS and 2-mercaptoethanol, or in native situation. By comparing the data of the polypeptide mass Matrix-assisted laser desorption/ionization time-of-flight （MALDI-TOF） mass spectrometry with those of the mass of the theoretical amino acid sequences from NCBI protein database, it was revealed that it was Q40091｜Q40091_IPOBA, sweet potato sporamin B - Ipomoea Batatas （sweet potato）（Batate）. The sequence coverage was 70.6%. N-terminal sequence was SETPV （Ser-Glu-Thr-Pro-Val）. There is a linear relationship between trypsin inhibitor activity （Ti activity） and amounts of this sporamin B （3-18 μg mL-1）. The equation of linear regression was y = 2.5809x ＋ 17.049 （r2 = 0.9966）. There was a curvilinear relationship between Ti activity and amounts of this sporamin B （21-150 μg mL-1）. The equation of curvilinear regression is y = 14.417ln（x）＋ 23.26 （r2 = 0.9924）. The concentration of sporamin B with Ti activity after heating at 40°C may induce part denature of this sporamin B, and there was no statistic difference after heating at 40, 50, 60°C for 20 min. Heat treatment at more than 90°C leads to a dramatic decrease of trypsin inhibitor efficiency. The results suggested that Q40091｜Q40091_IPOBA was the major sporamin B in sweet potato tubers [Ipomoea Batatas （L.） Lam cv. 55-2], which had strong Ti activity, and was stable to both thermal and DTT （DL-dithiothreitol） relatively.

关键词： sweet potato sporamin B identification trypsin inhibitor activity

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Coexistence of tuberculosis and squamous cell carcinoma in the right main bronchus:A case report

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World Journal of Clinical Cases 2021年第25期9卷 7520-7526页

作者： Hui Jiang Ya-qing li Department of Internal Medicine Zhejiang Provincial People’s HospitalPeople’s Hospital of Hangzhou Medical CollegeHangzhou 310014Zhejiang ProvinceChina Department of Internal Medicine Cancer Hospital of the University of Chinese Academy of Sciences(Zhejiang Cancer Hospital)Hangzhou 310014Zhejiang ProvinceChina

BACKGROUND Lung cancer with pulmonary tuberculosis(TB)refers to the occurrence of lesions simultaneously or sequentially in the lung(s)of the same patient,and the pathological examination and sputum TB examination diagnose them as lung cancer and TB,*** occurrence of endobronchial TB(EBTB)with endobronchial tumor sequentially in the same bronchus lesion of the same patient is relatively *** SUMMARY A 62-year-old female patient was admitted to a local hospital on June 18,2019 after a 3-mo history of *** was a farmer and had no history of smoking and alcohol *** patient had neither family nor work contact indicating exposure to *** chest computed tomography(CT)examination showed that the right main bronchus was occupied and malignant tumor was *** examination of a bronchial biopsy showed granulomatous inflammation with caseification and the presence of acid fast bacilli(AFB).However,after 6 mo of antitubercular treatment,repeat bronchoscopy and biopsy histological examination showed squamous cell *** patient has started on systemic chemotherapy with *** another two cycles of therapy,chest CT showed complete resolution of the *** lavage and bronchial aspirate were negative for AFB and cancer *** It is not only more likely that a patient presenting with what appears to be TB will concurrently have a pulmonary malignancy than someone who does not have a TB infection,but also that it is of greater urgency to make an expedited diagnosis of the malignancy.

关键词： Tumorous endobronchial tuberculosis Bronchial squamous cell cancer Diagnosis Treatment Case report

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On the rate of convergence for multi-category classification based on convex losses

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Science China Mathematics 2007年第11期50卷 1529-1536页

作者： Hong CHEN Luo-qing li Faculty of Mathematics and Computer Science Hubei UniversityWuhan 430062China Faculty of Mathematics and Computer ScienceHubei UniversityWuhan 430062China

The multi-category classification algorithms play an important role in both theory and practice of machine *** this paper,we consider an approach to the multi-category classification based on minimizing a convex surrogate of the nonstandard misclassification *** bound the excess misclassification error by the excess convex *** construct an adaptive procedure to search the classifier and furthermore obtain its convergence rate to the Bayes rule.

关键词： misclassiflcation error consistency convergence rate

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