检索结果-南通市图书馆

Comparison of cytotoxicity and wound healing effect of carboxymethylcellulose and hyaluronic acid on human corneal epithelial cells

引用

International Journal of Ophthalmology(English edition) 2015年第2期8卷 215-221页

作者： jong Soo lee Seung Uk lee Cheng-Ye Che Ji-Eun lee Department of Ophthalmology School of MedicinePusan National University Biomedical Research Institute Pusan National University Hospital Department of Ophthalmology School of Medicine Kosin University Department of Ophthalmology the Affiliated Hospital of Medical College Qingdao University Research Institute for Convergence of Biomedical Science and Technology Pusan National University Yangsan Hospital

AIM: To investigate the cytotoxic effect on human corneal epithelial cells(HCECs) and the ability to faciliate corneal epithelial wound healing of carboxymethylcellulose(CMC) and hyaluronic acid(HA).METHODS: HCECs were exposed to 0.5% CMC(Refresh plus, Allergan, Irvine, California, USA) and 0.1% and 0.3%HA(Kynex , Alcon, Seoul, Korea, and Hyalein mini,Santen, Osaka, Japan) for the period of 30 min, and 4, 12,and 24 h. Methyl thiazolyl tetrazoiun(MTT)-based calorimetric assay was performed to assess the metabolic activity of cellular proliferation and lactate dehydrogenase(LDH) leakage assay to assess the cytotoxicity. apoptotic response was evaluated with flow cytometric analysis and fluorescence staining with Annexin V and propiodium iodide. Cellular morphology was evaluated by inverted phase-contrast light microscopy and electron microscopy. The wound widths were measured 24 h after confluent HCECs were scratch ***: The inhibitory effect of human corneal epithelial proliferation and cytotoxicity showed the time-dependent response but no significant effect. Apoptosis developed in flow cytometry and apoptotic cells weredemonstrated in fluorescent micrograph. The damaged HCECs were detached from the bottom of the dish and showed the well-developed vacuole formations. Both CMC and HA stimulated reepithehlialization of HCECs scratched, which were more observed in ***: CMC and HA, used in artificial tear formulation, could be utilized without any significant toxic effect on HCECs. Both significantly stimulated HCEC reepithelialization of corneal wounds.

关键词： carboxymethylcellulose corneal wound healing human corneal epithelial cells hyaluronic acid cytotoxicity

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Study on the removal of NO_x from simulated flue gas using acidic NaClO_2 solution

引用

Journal of Environmental Sciences 2008年第1期20卷 33-38页

作者： Bal Rai Deshwal Si Hyun lee jong Hyeon Jung Byung Hyun Shon Hyung Keun lee Department of Chemistry A.I.J.H.M College Rohtak 124001 (Haryana) India. Korea Institute of Energy Research Daejeon-305 343 Korea Department of Environmental Engineering Sorabol College Kyungbuk 780711 Korea Department of Environmental Engineering Hanseo University Chungnam 356820 Korea

The study on the removal of NOx from simulated flue gas has been carded out in a lab-scale bubbling reactor using acidic solutions of sodium chlorite. Experiments were performed at various pH values and inlet NO concentrations in the absence or presence of SO2 gas at 45℃. The effect of SO2 on NO oxidation and NO2 absorption was critically examined. The oxidative ability of sodium chlorite was investigated at different pH values and it was found to be a better oxidant at a pH less than 4. In acidic medium, sodium chlorite decomposed into C102 gas, which is believed to participate in NO oxidation as well as in NO2 absorption. A plausible NOx removal mechanism using acidic sodium chlorite solution has been postulated. A maximum NOx removal efficiency of about 81% has been achieved.

关键词： bubbling reactor acidic sodium chlorite flue gas NOx removal

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Dynamic recrystallization behavior and microstructural evolution of Mg alloy AZ31 through high-speed rolling

引用

Journal of Materials Science & Technology 2018年第10期34卷 1747-1755页

作者： Jeong Hun lee jong Un lee Sang-Hoon Kim Seok Weon Song Chong Soo lee Sung Hyuk Park Ulsan Regional Division Korea Institute of Industrial Technology School of Materials Science and Engineering Kyungpook National University Technical Research Laboratories POSCO Graduate Institute of Ferrous Technology Pohang University of Science and Technology

High-speed rolling （HSR） is known to improve the workability of Mg alloys significantly, which makes it possible to impose a large reduction in a single pass without fracture. In the present study, dynamic recrystallization （DRX） behavior and microstructural and textural variations of Mg alloy AZ31 dur-ing a HSR process were investigated by conducting rolling with different imposed reductions in the range of 20%-80% at a high rolling speed of 470 m/min and 400℃. High-strain-rate deformation during HSR suppresses dislocation slips but promotes twinning, which results in the formation of numer-ous twins of several types, i.e., {10-12} extension twins, {10-11} and {10-13} contraction twins, and {10-11}-{10-12} double twins. After twinning, high strain energy is accumulated in twin bands because their crystallographic orientations are favorable for basal slips, leading to subsequent DRX at the twin bands. Accordingly, twinning activation and twinning-induced DRX behavior play crucial roles in accommodating plastic deformation during HSR and in varying microstructure and texture of the high- speed-rolled （HSRed） sheets. Area fraction of fine DRXed grains formed at the twin bands increases with increasing rolling reduction, which is attributed to the combined effects of increased strain, strain rate, and deformation temperature and a decreased critical strain for DRX. Size, internal strain, and texture intensity of the DRXed grains are smaller than those of unDRXed grains. Therefore, as rolling reduction increases, average grain size, stored internal energy, microstructural inhomogeneity, and basal texture intensity of the HSRed sheets gradually decrease owing to an increase in the area fraction of the DRXed grains.

关键词： Magnesium alloy High-speed rolling Twinning Dynamic recrystallization Microstructure

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

A case of colohepatic penetration by a swallowed toothbrush

引用

World Journal of Gastroenterology 2006年第15期12卷 2464-2465页

作者： Min Ro lee Yong hwang jong Hun Kim Department of Surgery Chonbuk National University Medical School San 2-20 Geumam-dongDeokjin-guJeonjuJeonbuk 561-180South Korea Research Institute of Clinical MedicineChonbuk National University Medical SchoolSan 2-20 Geumam-dongDeokjin-guJeonjuJeonbuk 561-180South Korea Department of Surgery Chonbuk National University Medical School San 2-20 Geumam-dongDeokjin-guJeonjuJeonbuk 561-180South Korea

Although foreign body ingestion is relatively common,toothbrush swallowing is rare. We report a case of a swallowed toothbrush which passed through the ileocecal valve and perforated the proximal transverse colon,then... 详细信息

关键词： Toothbrush Colohepatic penetration

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Fungal inoculation induces agarwood in young Aquilaria malaccensis trees in the nursery

引用

Journal of Forestry Research 2014年第1期25卷 201-204页

作者： Rozi MOHAMED Phai lee jong Abd Kudus KAMZIAH Forest Biotechnology Laboratory Department of Forest ManagementFaculty of ForestryUniversiti Putra Malaysia Department of Forest Management Faculty of ForestryUniversiti Putra Malaysia

Fungi are often used to induce agarwood inAquilariatrees. This study was conducted to evaluate the effect of several fungi on agarwood formation over time in youngAquilaria malaccensis （Lam.） trees. Typical changes in the length and light intensity of the resulting discoloration were observed after three and six month periods following inoculation. Wood samples were observed microscopically and classified into several light intensity groups. The discoloration length was meas-ured longitudinally. The duration after inoculation affected the mean of discoloration length： the 6-month old sample （1.70 cm） had a wider discoloration zone when compared to the 3-month old sample （1.17 cm）. When measuring the discoloration intensity, a positive relationship with time was perceived. Digital images, captured using a camera-equipped microscope, revealed that wood samples collected after six months appeared to be 1.8-times darker than after three months. We concluded that time, not the species of any of the tested fungi, had significant effect on discoloration length and intensity. Gas chromatography/mass spec-trometry （GCMS） analysis of the 6-month old sample yielded some important agarwood compounds such as benzylacetone, anisylacetone, guaiene and palustrol. This demonstrates that the tested fungi have the ability to induce agarwood formation in nurseryA. malaccensis trees.

关键词： Artificial inoculation discoloration zone fungi guaiene palustrol

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Diagnostic value of maximal-outer-diameter and maximal-mural-thickness in use of ultrasound for acute appendicitis in children

引用

World Journal of Gastroenterology 2009年第23期15卷 2900-2903页

作者： Bo-Kyung Je Sung-Bum Kim Seung hwa lee Ki Yeol lee Sang Hoon Cha Department of Radiology College of Medicine Korea University #516 Gojan1-Dong Danwon-Gu Ansan-City Gyeonggi-Do 425-707 South Korea Department of Internal Medicine Dongshin Hospital #430 Hongeundong Seodaemungu Seoul 120-100 South Korea

MM： To evaluate the maximal-outer-diameter （MOD） and the maximal-mural-thickness （MMT） of the appendix in children with acute appendicitis and to determine their optimal cut-off values to diagnose acute appendicitis.METHODS： In total, 164 appendixes from 160 children between 1 and 17 years old （84 males, 76 females; mean age, 7.38 years） were examined by high-resolution abdominal ultrasound for acute abdominal pain and the suspicion of acute appendicitis. We measured the MOD and the MMT at the thickest point of the appendix. Patients were categorized into two groups according to their medical records： patients who had surgery （surgical appendix group） and patients who did not have surgery （non-surgical appendix group）. Data were analyzed by MedCalc v.9.3. The rank sum test （Mann-Whitney test） was used to evaluate the difference in the MOD and the MMT between the two groups. ROC curve analysis was used to determine the optimal cut-off value of the MOD and the MMT on diagnosis of acute appendicitis.RESULTS： There were 121 appendixes （73.8%） in the non-surgical appendix group and 43 appendixes （26.2%） in the surgical appendix group. The median MOD differed significantly between the two groups （0.37 cm vs 0.76 cm, P〈 0.0001）, and the median MMT also differed （0.15 cm vs 0.33 cm, P 〈 0.0001）. The optimal cut-off value of the MOD and the MMT for diagnosis of acute appendicitis in children was 〉 0.57 cm （sensitivity 95.4%, specificity 93.4%） and 〉 0.22 cm （sensitivity 90.7%, specificity 79.3%）, respectively.CONCLUSION： The MOD and the MMT are reliable criteria to diagnose acute appendicitis in children. An MOD 〉 0.57 cm and an MMT 〉 0.22 cm are the optimal criteria.

关键词： Appendicitis Ultrasonography Pediatrics Diagnosis ROC curve

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Modeling and cyclic behavior of segmental bridge column connected with shape memory alloy bars

引用

Earthquake Engineering and Engineering Vibration 2012年第3期11卷 375-389页

作者： hwasung Roh Andrei M.Reinhorn jong Seh lee Dept.of Civil and Environmental Engineering Hanyang University Dept.of Civil Structural and Environmental EngineeringUniversity at Buffalo The State University of New York

This paper examines the quasi-static cyclic behavior, lateral strength and equivalent damping capacities of a system of post-tensioned segmental bridge columns tied with large diameter martensitic Shape Memory Alloy （SMA） link-bars. Moment-curvature constitutive relationships are formulated and analysis tools are developed for the PT column, including a modified four-spring model prepared for the SMA bars. The suggested system is exemplified using a column with an aspect ratio of 7.5 and twelve 36.5 mm diameter NiTi martensitic SMA bars. A post-tensioning force of 40% to 60% of the tendon yield strength is applied in order to obtain a self re-centering system, considering the residual stress of the martensitie SMA bars. The cyclic response results show that the lateral strength remains consistently around 10% of the total vertical load and the equivalent viscous damping ratios reach 10%-12% of critical. When large diameter NiTi superelastic SMA bars are incorporated into the column system, the cyclic response varies substantially. The creep behavior of the superelastic SMA bar is accounted for since it affects the re-centering capability of the column. Two examples are presented to emphasize the modeling sensitivities for these special bars and quantify their cyclic behavior effects within the column assembly.

关键词： segmental rocking columns shape memory alloy bars cyclic response energy dissipation damping recentering

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Unsteady Shock-Flow Characteristics in an Over-Expanded Rocket Nozzle

引用

Journal of Thermal Science 2010年第4期19卷 332-336页

作者： jong Sung lee Huey Dong Kim Toshiaki Setoguchi Shigeru Matsuo School of Mechanical Engineering Andong National UniversityAndong760-749Korea Department of Mechanical Engineering Saga University1HonjoSagaJapan

A numerical investigation of transient side-loads in an axisymmetric over-expanded thrust optimized contour nozzle is *** nozzles experience side-loads during start-up and shut-down operations,because of the flow separation at nozzle *** types of flow separations such as FSS and RSS shock structure occur.A two-dimension numerical simulation has been carried out over an axisymmetric TOC nozzle to validate present results and investigate oscillatory flow characteristics for start-up *** Averaged Navier-Stokes equations are numerically solved using a fully implicit finite volume *** equations are solved by coupled implicit *** Stress turbulence model is *** computed pressure at the nozzle wall closely matched with experiment data.A hysteresis phenomenon has been observed between these two shock *** transition from FSS to RSS pattern during start-up process has shown maximum nozzle wall *** wall pressure and shear stress values have shown fluctuations during the FSS to RSS transition. The oscillatory pressure has been observed on the nozzle wall for high pressure *** results have shown that magnitude of the nozzle wall pressure variation is high for the oscillatory phenomenon.

关键词： Free shock separation Over-expansion flow Restricted shock separation Side-loads Supersonic nozzle

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

SnO2@Co3O4 hollow nano-spheres for a Li-ion battery anode with extraordinary performance

引用

Nano Research 2014年第8期7卷 1128-1136页

作者： Won-Sik Kim Yoon hwa Hong-Chan Kim jong-Hyun Choi Hun-Joon Sohn Seong-Hyeon Hong Department of Materials Science and Engineering and Research Institute of Advanced Materials Seoul National University Seoul151-744 Republic of Korea

SnO2@Co3O4 hollow nano-spheres have been prepared using the template-based sol-gel coating technique and their electrochemical performance as an anode for lithium-ion battery （LIB） was investigated. The size of synthesized hollow spheres was about 50 nm with the shell thickness of 7-8 nm. The fabricated SnO2@Co3O4 hollow nano-sphere electrode exhibited an extraordinary reversible capacity （962 mAh-g-1 after 100 cycles at 100 mA-g-1）, good cyclability, and high rate capability, which was attributed to the Co-enhanced reversibility of the Li20 reduction reaction during cycling.

关键词： hollow sphere lithium-ion battery anode SnO2 Co3O4

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Effect of temperature switchover on the degradation of antibiotic chloramphenicol by biocathode bioelectrochemical system

引用

Journal of Environmental Sciences 2014年第8期26卷 1689-1697页

作者： Deyong Kong Bin Liang Duu-jong lee Aijie Wang Nanqi Ren State Key Laboratory of Urban Water Resource and Environment School of Municipal and Environmental EngineeringHarbin Institute of Technology Key laboratory of Environmental Biotechnology Research Center for Eco-Environmental SciencesChinese Academy of Sciences

Exposure to chloramphenicol（CAP）,a chlorinated nitroaromatic antibiotic,can induce CAP-resistant bacteria/genes in diverse environments. A biocathode bioelectrochemical system（BES） was applied to reduce CAP under switched operational *** switching from 25 to 10°C,the CAP reduction rate（kCAP） and the maximum amount of the dechlorinated reduced amine product（AMCl,with no antibacterial activity） by the biocathode communities were both markedly decreased. The acetate and ethanol yield from cathodophilic microbial glucose fermentation（with release of electrons） was also reduced. Formation of the product AMCl was enhanced by the biocathode dechloridation reaction compared with that produced from pure electrochemical or microbial dechloridation processes. The electrochemical and morphological analyses of cathode biofilms demonstrated that some cathodophilic microbes could adapt to low temperature and play a key role in CAP degradation. The resilient biocathode BES has a potential for the treatment of CAP-containing wastewater in temperature fluctuating environments.

关键词： Chloramphenicol degradation Biocathode Dechloridation Temperature switchover

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：