检索结果-内蒙古大学图书馆

Pore structure analysis of swollen dextran-methacrylate hydrogels by SEM and mercury intrusion porosimetry

Journal of biomedical Materials Research Part B: Applied Biomaterials 2002年第3期53卷

作者： Sin–hee Kim Chih–Chang Chu Fiber and Polymer Science Program Department of Textiles & Apparel and Biomedical Engineering Program Cornell University Ithaca NY 14853

The objectives of this study were to visually examine the surface and interior morphology of a new class of biodegradable hydrogels based on dextran-methacrylate and to quantify the porous structure of these hydrogels in swollen state. Two techniques (scanning electron microscopy and mercury intrusion porosimetry) were used to analyze pore structure of dextran-methacrylate hydrogels as a function of the degree of methacrylate substitution. SEM was used to observe 3-dimensional network structure of cryofixed and fractured swollen dextran-methacrylate hydrogels. Image analysis of the SEM data revealed different pore shapes and sizes, depending on the degree of substitution and the location within the hydrogel. A higher methacrylate-substituted dextran hydrogel showed a compact and rigid pore structure, while a lower substituted hydrogel showed a delicate and fragile pore structure. Mercury intrusion porosimetry analysis of the pore structure of dextran-methacrylate hydrogels provided useful and more reliable quantitative data of pore characteristics, such as total pore area, average pore diameter, their distribution, and bulk density. The total pore area and average pore diameter of swollen dextran-methacrylate hydrogels decreased with an increase in degree of methacrylate substitution, while bulk density increased with an increase in degree of substitution. © 2000 John Wiley & Sons, Inc. J Biomed Mater Res (Appl Biomater) 53: 258–266, 2000

关键词： dextran-methacrylate hydrogel pore structure scanning electron microscopy mercury intrusion porosimetry morphology image analysis

来源：评论

学校读者我要写书评

暂无评论

Erratum to: Crank inertial load affects freely chosen pedal rate during cycling

引用

Journal of Biomechanics 2002年第11期35卷 1521-1521页

作者： Ernst Albin Hansen Lars Vincents Jørgensen Kurt Jensen Benjamin Jon Fregly Gisela Sjøgaard Institute of Sports Science and Clinical Biomechanics University of Southern Denmark Campusvej 55 5230 Odense Denmark Team Denmark Test Center University of Southern Denmark Odense Denmark Department of Aerospace Engineering Mechanics and Engineering Science and Biomedical Engineering Program University of Florida Gainesville FL USA National Institute of Occupational Health Copenhagen Denmark

来源：评论

学校读者我要写书评

暂无评论

High-speed photographic evaluation of retropulsion momentum induced by a laser calculi lithotriptor

High-speed photographic evaluation of retropulsion momentum ...

引用

2001 ASME International Mechanical engineering Congress and Exposition

作者： Lee, Ho Kim, Jeehyun Choi, Bernard Teichman, Joel M.H. Welch, A.J. Department of Mechanical Engineering University of Texas at Austin Austin TX United States Department of Electrical Engineering University of Texas at Austin Austin TX United States Biomedical Engineering Program University of Texas at Austin Austin TX United States Division of Urology University of Texas Health Science Center San Antonio TX United States

The retropulsive momentum induced by a laser calculi lithotriptor was evaluated by high-speed photography. Calculus phantoms made from plaster of paris were placed in a clear glass tube that served as in vitro model of the ureter. Movement of the calculus was monitored by a high-speed camera which had provided pictures in every 300μsecond. It was found that the recoil momentum proportionally increased with increasing laser energy and larger fiber diameter resulted in higher momentum.

关键词： Laser tissue interaction

来源：评论

学校读者我要写书评

暂无评论

Abstract

引用

Canadian Journal of Anesthesia 2003年第1期50卷 A69-A183页

作者： Nivez F. Rasic Robert M. Friesen Bruce Anderson Shirley A. Hoban Nancy Olson Jacob Kress Simon Lévesque Martin R. Lessard Pierre Nicole Stéphan Langevin Jacques Langevin François LeBlanc Jacques Brochu Alexis Turgeon Pierre C. Nicole Claude A. Trépanier Sylvie Marcoux Vynka C. Lash Keith Anderson J. Francisco Asenjo Francesco Carli Dale A. Engen Gordon H. Morewood Nancy Ghazar Ted Ashbury Elizabeth G. VanDenKerkhof Louie Wang Katherine R. Blight C. David Mazer Gregory M. T. Hare Zhilan Wang Carla Coackley Rong Qu Malcolm Robb Duncan J. Stewart Thomas Schricker Sarkis Meterissian Ralph Lattermann Franco Carli Jean-Yves Dupuis Feng Wang Howard Nathan Kathryn Williams James A. Robblee Howard J. Nathan Raynauld Ko Marelise Kruger Karen McRae Gail Darling Thomas Waddell David Morrice Desmond McGlade Ken Cheung Joel Katz Peter Slinger Andrew J. Baker Kathryn M. Hum Steve Y. Kim Aiala Barr Zeev Friedman David T. Wong Frances Chung David H. Goldstein William C. Blaine Michael J. Rimmer Jacelyn M. Kolman Orlando R. Hung Ian G. Beauprie Robert Vandorpe Chandran J. Baker William Rennie Robert Brown Susan Kenny Damon Kamming Brid McGrath Bruna Curti Shirley King Brenda W. Lau Craig R. Ries Josie Schmid Richard N. Kraima Toshimi Arai Masao Yamashita William Splinter Uma R. Parekh Teresa Valois-Gomez John G. Muir Andrew G. Usher Ramona A. Kearney Ban C. H. Tsui D. Shende V. Darlong N. Asit Justin Richards John Van Aerde Alese Wagner Dominic Cave Ramona Kearney Leeanne Philips Kathy Reid Khalid Chowdary Peter Brooks Ron Ree Mark Ansermino David Rosen Pirjo H. Manninen Ghazali Ghazaime Soad Louissi Bisi Odukoya Rosendo A. Rodriguez Luciana Parlea Fraser D. Rubens Paul Hendry Il-Ok Lee In Ho Lee Paul Audu Peter H. K. Mak Pirijo H. Manninen Shanti Sundar Stephan K. W. Schwarz Ernest Puil Steven E. Hybarger Tod B. Sloan Richard Brull Colin J. L. McCartney Regan Rawson Sherif Abbas Vincent W. S. Chan D. Ong D. Ha H. Ha W. P. S. McKay Myung-Hoon Kong Mi-Kyung Lee Sang-Ho Lim Young-Seok Choi Nan-Sook Kim P. H. Lennox H. S. Umedaly C. Department of Anesthesia St. Boniface General Hospital Winnipeg Department of Anesthesia (critical care division) Laval University and CHA Hopital Enfant-Jésus Quebec City Departments of Anesthesiology and Social and Preventive Medicine Laval University and CHA Hôpital de l’Enfant-Jésus Quebec City Department of Anesthesia Montreal General Hospital Site McGill University Health Centre Montreal Department of Anesthesiology Queen’s University Kingston Department of Anesthesia and Division of Cardiology University of Toronto St. Michael’s Hospital Toronto Department of Anesthesia McGill University Royal Victoria Hospital Montreal Canada Epidemiology Unit H University of Ottawa Heart Institute Ottawa Cardiac Division of Anesthesia University of Ottawa Heart Institute Ottawa University of Ottawa Heart Institute Ottawa Department of Anesthesia and Pain Management Toronto General Hospital University Health Network University of Toronto Toronto Department of Surgery Division of Thoracic Surgery Toronto General Hospital University of Toronto Toronto Department of Anaesthesia University of Toronto St. Michael?s Hospital Toronto Department of Anesthesia Toronto Western Hospital University Health Network and Faculty of Nursing University of Toronto Toronto Dept of Anesthesiology Queen’s University Kingston Depts. of Anesthesia and Radiology QEII Health Science Centre Halifax Department of Anesthesia and Department of Surgery Health Sciences Center Winnipeg Department of Anesthesia University of Toronto Toronto Western Hospital Toronto Department of Anesthesia The University of British Columbia Vancouver Department of Anesthesia Prince George Regional Hospital Prince George Department of Anesthesiology Ibaraki Children’s Hospital Ibaraki Japan Department of Anesthesiology Children’s Hospital of Eastern Ontario Ottawa Department of Paediatric Anaesthesia IWK Health Centre Halifax Department of Anesthesiology and Pain Medicine University of Alberta Hospital Edmonton

来源：评论

学校读者我要写书评

暂无评论

Left ventricular geometry immediately following defibrillation-strength shocks

Left ventricular geometry immediately following defibrillati...

引用

Computers in Cardiology (CinC)

作者： V. Ramanathan B. Hoffmeister A. de Jongh Joint Graduate Program in Biomedical Engineering University of Tennessee Health Science Center USA Department of Physics Rhodes College Memphis USA

A previous 2D ultrasound study (R.A. Malkin et al., 2001) suggested that there is relaxation of the myocardium after defibrillation. However, that 2D study could not measure activity occurring within the first 33 ms following the shock. Thus, the objective of our study is to determine the left ventricular (LV) geometry during this period. Biphasic defibrillation shocks were delivered to seven dogs. 1D short-axis ultrasound images of the LV cavity were acquired, the boundary of the anterior and posterior endocardial walls was extracted and the distance between them computed from 32 ms before to 32 ms after the shock. The normalized mean pre- and post-shock slopes were 0.2 /spl plusmn/ 2.2 and 3.3 /spl plusmn/ 7.9 %/10 ms, respectively. The post-shock LV diameter slope is positive in the first 32 ms following both successful and unsuccessful defibrillation shocks (p<0.05). Therefore, our results confirm that the bulk of the myocardium is relaxing immediately after a defibrillation shock.

关键词： Geometry Electric shock Defibrillation Ultrasonic imaging Pulse measurements Myocardium Ultrasonic variables measurement biomedical measurements Dogs Sampling methods

来源：评论

学校读者我要写书评

暂无评论

Computational Model of Interacting Brain Networks

引用

Journal of Investigative Medicine 2001年第1_SUPPL_PART_3期52卷 155页

作者： M.C. Ripplinger C.J. Wilson J.G. King J. Frye R. Drewes F.C. Harris P.H. Goodman Departments of Internal Medicine and Computer Science and Program in Biomedical Engineering University of Nevada Reno NV.

来源：评论

学校读者我要写书评

暂无评论

Inducibility of Ventricular Arrhythmias in a Rat Model of Cardiac Fibrosis

引用

Journal of Investigative Medicine 2001年第1_SUPPL_PART_3期52卷 259页

作者： S. C. Marak A. L. de Jongh Curry T. A. Williams R. A. Malkin Y. Sun Joint Graduate Program in Biomedical Engineering University of Memphis and University of Tennessee Health Science Center Memphis TN

来源：评论

学校读者我要写书评

暂无评论

Optimization of DNA microsensor arrays for biological detection

Optimization of DNA microsensor arrays for biological detect...

引用

ASME 2000 International Mechanical engineering Congress and Exposition, IMECE 2000

作者： Gau, Jen-Jr Lan, Esther H. Dunn, Bruce Ho, Chih-Ming Biomedical Engineering Interdepartmental Graduate Degree Program University of California Los Angeles United States Department of Materials Science and Engineering University of California Los Angeles United States Department of Mechanical and Aerospace Engineering University of California Los Angeles United States

ISBN: (纸本)9780791819005

This paper describes the characterization and optimization of a reusable DNA microsensor array for rapid biological agent detection developed in previous publications. (Fig.l) [1-3] This MEMS based DNA sensor utilizes a standard three-electrode electrochemical cell configuration with novel micro fabricated structure design to minimize non-specific binding. The sensor module is easily to be adapted to various protocols and can be used for rapid detection of macromolecules (DNA, RNA) from targets such as uropathogenic Escherichia coli (E. coli) in urine and microorganisms causing otitis media (middle ear infection). Less than 105 E. coli cells can be detected from the urine sample of a patient with urine tract infection. The sensitivity is enhanced by appropriate sensor characterization and surface modification. The total detection time including sample preparation can be reduced to 25 minutes by using a POD conjugated oligonucleotide. Copyright © 2000 by ASME

关键词： DNA

来源：评论

学校读者我要写书评

暂无评论

The Significance of Computational Modelling in Murine Cardiac Ventricular Cells

引用

Applied Bionics and Biomechanics 2000年第2期1卷 107-114页

作者： Semahat S. Demir Joint Graduate Program in Biomedical Engineering The University of Memphis and The University of Tennessee Health Science Center Memphis TN USA Adjunct Faculty of Graduate School of Science and Engineering Işık University Maslak Istanbul Turkey

Five decades of histological, electrophysiological, pharmacological and biochemical investigations exist, but relatively little is known regarding the ionic mechanisms underlying the action potential variations in the ventricle associated with healthy and disease conditions. The computational modelling in murine ventricular myocytes can complement our knowledge of the experimental data and provide us with more quantitative descriptions in understanding different conditions related to normal and disease conditions. This paper initially reviews the theoretical modelling for cardiac ventricular action potentials of various species and the related experimental work. It then focuses on the progress of computational modelling of cardiac ventricular cells for normal, diabetic and spontaneously hypertensive rats. Also presented is the recent modelling efforts of the action potential in mouse ventricular cells. The computational insights gained into the ionic mechanisms in rodents will enhance our understanding of the heart and provide us with new knowledge for future studies to treat cardiac diseases in children and adults.

关键词： mathematical modelling ventricular myocytes cell membrane simulations model development

来源：评论

学校读者我要写书评

暂无评论

Undergraduate and graduate design projects [in bioengineering]

Undergraduate and graduate design projects [in bioengineerin...

引用

Annual International Conference of the IEEE engineering in Medicine and Biology Society (EMBC)

作者： G.B. Devey Biomedical Engineering and Research to Aid Persons with Disabilities Program Bioengineering and Environmental Systems Division Directorate for Engineering National Science Foundation Arlington VA USA

ISBN: (纸本)0780364651

NST support is provided principally in the form of grants awarded on a competitive basis under a rigorous peer review process; NSF does not conduct research itself. In 1992, NSF defined a project eligible for support as bioengineering research as one "...with diagnosis or treatment-related goals, that applies engineering principles to problems in biology and medicine while advancing engineering knowledge is eligible for support. Bioengineering research to aid persons with disabilities is also eligible". Bioengineering at NSF has two defined programs: 1. "Biochemical engineering", and 2. a two-component activity "biomedical engineering" (BME) and "Research to Aid Persons with Disabilities" (RAPD). The material that follows describes the Undergraduate and Graduate Design Projects, which is part of the RAPD component of the bioengineering program.

关键词： biomedical engineering engineering in medicine and biology Design engineering Knowledge engineering Proposals engineering students Medical diagnostic imaging Guidelines US Government Systems engineering education

来源：评论

学校读者我要写书评

暂无评论

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

请选择保存的检索档案：

请选择收藏分类：

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

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

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：