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Evaluation of periodontal healing in class II furcation defects following guided tissue regeneration with two different types of poly lactic acid membranes

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Chinese Medical Journal 2004年第2期17卷 270-274页

作者： Deniz Cetiner Berrinnsal Ates Parlar ElifGültekin BülentKurtis Department of Periodontology Faculty of Dentistry Gazi University Ankara TurkeyDepartment of Periodontology Faculty of Dentistry Gazi University Ankara TurkeyDepartment of Periodontology Faculty of Dentistry Gazi University Ankara TurkeyDepartment of Pathology Faculty of Dentistry Gazi University Ankara TurkeyDepartment of Periodontology Faculty of Dentistry Gazi University Ankara Turkey

Background Guided tissue regeneration procedures provide predictable reconstruction of periodontal tissues in the treatment of furcation involvements in animals and huamns. This study was to compare long-term effectiveness of two different types of polylactic acid (PLA) membranes on periodontal regeneration in surgically created class II furcation defects in dogs.Methods Full thickness mucoperiosteal flap was raised on the buccal aspects of the experimental teeth and class II furcation defects having 5 mm vertical dimensions were created on mandibular premolar III and IV on each quadrant. The exposed root surfaces were thoroughly planed and PLA membranes were placed over the experimental defects on both sites. One site received liquid polymer membrane (LPM), and resorbable periodontal mesh (RPM) membranes were applied to the other site. The animals were sacrificed at 7 months after surgery and the specimens were processed for histological evaluation.Results The average length of new attachment formed on the treated roots in both groups ranged from 3. 02 mm to 4. 5 mm. Complete bone filling was observed at the furcation sites. No statistically significant differences were found between two membranes in any of the parameters (P>0. 05).Conclusion This study demonstrates favorable regenerative outcomes by the use of two different types of PLA membranes that could be used as alternatives for guided tissue regeneration (GTR).

关键词： guided tissue regeneration polyfactic acid membranes furcation/surgery experimental studies

Electrochemical studies of Meldola blue-modified bilayer lipid membranes

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Chinese Science Bulletin 1997年第3期42卷 203-207页

作者： Ding, L Wang, EK CHINESE ACAD SCI CHANGCHUN INST APPL CHEMELECTROANALYT CHEM LABCHANGCHUN 130022PEOPLES R CHINA

BILAYER lipid membranes (BLM) have been extensively regarded as a basic structure that forms the matrix of biological membranes. The properties of BLM may be altered by incorporation and modification and can be employed to study many membrane processes. Especially biosensors and bi-molecular electronic devices made by BLM have a wide application. Many kinds of organic dyes are known as biological stains and often used in biology, physiology, pharmacology and medicine. In general, coloring and staining processes involve adsorp-

关键词： Meldola blue bilayer lipid membranes (BLM) electrochemistry.

Relationship Between Electron Transport or Proton Transduction and ATP Synthesis in Fusion membranes in Light

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Science China Chemistry 1993年第12期36卷 1490-1500页

作者：李淑俊王健徐亚南邵菁彭建新 Shanghai Institute of Plant Physiology Academia Sinica Shanghai 200032 PRC

The phosphorylation coupling factors of the chloroplast thylakoid membranes were plucked off to form deficient membranes which were combined with crista membranes to form a fusion system. This membranes reconstituted ATP synthesis activity in light. However, the △pH in the reaction medium was not *** paper is a report on some of the results obtained recently in connection with the problem. Various examinations and measurements were used and this phenomenon was repeated. Through the reconstituted system, (thylakoid membranes combined with crista membranes) the kinetic proton changes were studied. It proved that the photophosphorylation activity of this system increased with the increase of the quantity of the combined crista membranes to which, however, the △pH in medium, the effects of 9-AA fluorescence quenching, and the absorption change of neutral red in the membrane pockets were inversely proportional. For this phenomenon, analyses and discussions on the relationship between electron

关键词： thylakoid membranes deficient membranes crista membranes fusion membranes proton transduction with ATP synthesis.

Preparation　of　YSZ　Microporous　membranes　on　Porous　α-Alumina　with　Metal　chlorides　as　Precursor

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Chemical Research in Chinese Universities 1997年第3期13卷 268-275页

作者： Peng, DK Liu, T Yang, PH Xia, CR Meng, GY UNIV SCI & TECHNOL CHINA DEPT MAT SCI & ENGNHEFEI 230026PEOPLES R CHINA

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关键词： YSZ Preparation Alumina membranes Metal Microporous Porous Precursor

Large-scale and high-quality III-nitride membranes through microcavity-assisted crack propagation by engineering tensile-stressed Ni layers

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Opto-Electronic Science 2022年第10期1卷 51-61,42-50页

作者： Jung-Hong Min Kwangjae Lee Tae-Hoon Chung Jung-Wook Min Kuang-Hui Li Chun Hong Kang Hoe-Min Kwak Tae-Hyeon Kim Youyou Yuan Kyoung-Kook Kim Dong-Seon Lee Tien Khee Ng Boon S.Ooi Photonics Laboratory ComputerElectrical and Mathematical Sciences and Engineering Division(CEMSE)King Abdullah University of Science and Technology(KAUST)Thuwal 23955-6900Saudi Arabia Department of Electrical Engineering Stanford UniversityStanfordCA 94305USA Light Source Research Division Korea Photonics Technology Institute(KOPTI)Gwangju 61007Republic of Korea School of Electrical Engineering and Computer Science Gwangju Institute of Science and TechnologyGwangju 61005Republic of Korea Department of Advanced Convergence Technology Research Institute of Advanced Convergence TechnologyKorea Polytechnic University237 Sangidaehak-roSiheung-si 15073Republic of Korea King Abdullah University of Science and Technology(KAUST) Thuwal 23955-6900Saudi Arabia

Epitaxially grown III-nitride alloys are tightly bonded materials with mixed covalent-ionic *** tight bonding presents tremendous challenges in developing III-nitride membranes,even though semiconductor membranes can provide numerous advantages by removing thick,inflexible,and costly ***,cavities with various sizes were introduced by overgrowing target layers,such as undoped GaN and green LEDs,on nanoporous templates prepared by electrochemical etching of n-type *** large primary interfacial toughness was effectively reduced according to the design of the cavity density,and the overgrown target layers were then conveniently exfoliated by engineering tensile-stressed Ni *** resulting III-nitride membranes maintained high crystal quality even after exfoliation due to the use of GaN-based nanoporous templates with the same lattice *** microcavity-assisted crack propagation process developed for the current III-nitride membranes forms a universal process for developing various kinds of large-scale and high-quality semiconductor membranes.

关键词： III-nitride alloys membranes nanoporous Ni stressor light-emitting diodes ultraviolet photodetectors

Design of metal-organic framework membranes towards ultimate gas separation

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Green Chemical Engineering 2021年第1期2卷 14-16页

作者： Yanwei Sun Yi Liu State Key Laboratory of Fine Chemicals School of Chemical EngineeringDalian University of TechnologyDalian116024China

Metal-organic framework(MOF)membranes have shown unprecedented opportunities for energy efficient separation of diverse industrially important gas pairs(e.g.H_(2)/CO_(2),CO_(2)/N_(2),CO_(2)/CH_(4),and C3H6/C3H8).Among the various factors,microstructure manipulation(including thickness,orientation,and grain boundary structure)and framework tuning(including pore size,framework rigidity/flexibility,and stimuli responsiveness)of MOF membranes have been found playing dominant roles in their separation *** this perspective,we highlighted some recent progress in polycrystalline MOF membranes with emphasis on the elucidation of the structure-performance relationship at different scales.

关键词： Metal organic frameworks Gas separation membranes Microstructure Orientation

Cake models applied to evaluate the fouling mechanism in separation of anionic polyacrylamide using modified PVDF ultrafiltration membranes

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Journal of Harbin Institute of Technology(New Series) 2012年第1期19卷 125-128页

作者：衣雪松时文歆于水利孙楠王硕孙力平 State Key Laboratory of Urban Water Resource and Environment Harbin Institute of Technology State Key Laboratory of Pollution Control and Resources Reuse Tongji University Tianjin Key Laboratory of Aquatic Science and Technology Tianjin Institute of Urban Construction

In the present study,nano-sized TiO2 /Al2O3 modified PVDF membranes (MM) were fabricated and utilized for anionic polyacrylamide ( APAM) separation. The results showed that,compared with PVDF membrane (OM) ,the contact angle of MM decreases from 83. 64° to 67. 42°,which indicates the increase of the hydrophilicity of MM. The relative flux (RF) decline curve of this ultrafiltration of APAM in water with time shows an obvious two stage properties. The cake filtration models were used to predict the performance of different time over the complete range of filtration times. All the four cake models could simulate this UF process to a certain extent,and the suitability of the two kinds of membranes was: cake filtration > intermediate pore blocking > standard pore blocking > complete pore blocking models. However,they became more and more unsuited to this process with time extending. Surface and cross-sectional morphology of membrane was investigated by SEM to make an advanced certificate of this UF mechanism.

关键词： cake models APAM nano-particles Al2O3 /TiO2 PVDF ultrafiltration membranes fouling mechanism

STUDY ON THE CONTROLLED MASS TRANSPORT THROUGH POROUS membranes

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化工学报 2000年第S1期51卷 15-19页

作者： Xu Xia and Cui Z. F (Department of Engineering Scinece, University of Oxford,OXI 3PJ, UK)

Cryopreservation of cells and tissues (natural or engineered) usually involves complicated protocols for addition and later removal of cryoprotecting agents to avoid osmotic shock and toxicity to cells. The rate of CPA addition and removal is essential to cell survival. In this study, the feasibility of using porous membrane to control the rate of CPA transfer to cell environment is studied, A purpose designed diffusion chamber was fabricated. The effects of membrane characteristics (porosity and effective thickness), temperature, and initial concentration were experimentally studied. A simplified mathematical model was developed, which provides the basis to desire the membrane parameters based on tile experimental measurements.

关键词： mass transport membranes diffusion rate control cryopreservation

Studies on Pervaporation Separation of Ethanol/Water Mixtures with membranes of Polypropylene Sulfonate Salts

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Chemical Research in Chinese Universities 1990年第4期6卷 386-390页

作者： Lin Shaokun, Xu Yingbin and Lin Shangan (Institute of Polymer Science, Zhongshan University, Guangzhou, 510275)

Sulfonated polypropylene membranes loaded with different kinds of counter-ions were prepared by heterogeneous chiorosulfonation reaction of polypropylene membrane followed by hydrolysis and ion-exchange reaction. The membranes obtained were used for selective separation of ethanol/water mixtures by pervaporation. The effects of counter-ion species, ion-exchange capacity, solution composition, thickness of membrane and temperature on the separation behavior of the membranes were investigated. Microstructure and morphology of the membranes were examined by X-ray and SEM as well.

关键词： Pervaporation separation membranes Polypropylene sulfonate