Proceedings of the 1995 Fourteenth Southern Biomedical Engineering Conference最新文献_第7页

Proceedings of the 1995 Fourteenth Southern Biomedical Engineering Conference Pub Date : 1995-04-07 DOI: 10.1109/SBEC.1995.514466

M. Marpet

引用次数: 2

A physical model of potential energy profiles of ions going through a biological membrane channel 离子通过生物膜通道的势能分布的物理模型

Proceedings of the 1995 Fourteenth Southern Biomedical Engineering Conference Pub Date : 1995-04-07 DOI: 10.1109/SBEC.1995.514421

C. Zou, K. Cheng

{"title":"A physical model of potential energy profiles of ions going through a biological membrane channel","authors":"C. Zou, K. Cheng","doi":"10.1109/SBEC.1995.514421","DOIUrl":"https://doi.org/10.1109/SBEC.1995.514421","url":null,"abstract":"To attempt to explain what determines a single particle (an ion or an ion group) penetration of a cell membrane channel, a physical model of potential energy profiles V/sub 2/(x) of a channel is proposed, based on the authors' previous study of one dimensional (1-D) steady state Schrodinger equation in a single particle system and in a time independent field. In this model, a V/sub 2/(x) is simplified as an effective constant height of potential energy barrier V/sub 2/ in a channel to obtain analytical solutions in mathematics. This model elucidates that: (1) Ion selectivity of a channel is determined by V/sub 2/. V/sub 2/ is divided into a V/sub 2c/ for a cation and V/sub 2a/ for an anion. V/sub 2c/ and V/sub 2a/ may be or may be not the same value depending on electrical characteristics of the particles and the channel. It is called a cation channel if a V/sub 2c/ is much lower than a V/sub 2a/ and vice versa. It is called a cation-anion cotransporter if a V/sub 2e/ and a V/sub 2a/ are equal or almost equal. (2) Whether a particle can penetrate through a channel is mostly determined by the repulsion energies (barriers) rather than the attraction energies (wells). (3) A channel's conformation can be changed when the channel is stimulated strongly enough. The variation of the conformation could influence V/sub 2/(x) and V/sub 2/, and eventually result in open or close of the channel.","PeriodicalId":332563,"journal":{"name":"Proceedings of the 1995 Fourteenth Southern Biomedical Engineering Conference","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1995-04-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131095561","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

DNA transformation using electrically charged tungsten microelectrodes 利用带电钨微电极进行DNA转化

Proceedings of the 1995 Fourteenth Southern Biomedical Engineering Conference Pub Date : 1995-04-07 DOI: 10.1109/SBEC.1995.514416

T. Harrington, E. Aamodt

引用次数: 1

North Louisiana experience with bone and soft tissue malignancies 在北路易斯安那州经历过骨和软组织恶性肿瘤

Proceedings of the 1995 Fourteenth Southern Biomedical Engineering Conference Pub Date : 1995-04-07 DOI: 10.1109/SBEC.1995.514480

J. J. Ward

引用次数: 0

Potential hazards associated with photocuring dentin bonding agents 光固化牙本质粘接剂的潜在危害

Proceedings of the 1995 Fourteenth Southern Biomedical Engineering Conference Pub Date : 1995-04-07 DOI: 10.1109/SBEC.1995.514445

N. Thompson, A. Puckett, S. Phillips, G. Reeves

{"title":"Potential hazards associated with photocuring dentin bonding agents","authors":"N. Thompson, A. Puckett, S. Phillips, G. Reeves","doi":"10.1109/SBEC.1995.514445","DOIUrl":"https://doi.org/10.1109/SBEC.1995.514445","url":null,"abstract":"Summary form only received as follows: Light sources used to cure dental restorative materials have improved greatly with many of them having intensities approaching 800 mW/cm/sup 2/. Because of the increased light intensity, the potential for exposing pulpal tissues to elevated temperatures is greater. The objective of this study was to measure the temperature rise associated with curing a dentin adhesive ProBond (Caulk Dentsply, Milford, DE) and a composite Z-100 (3M, St. Paul, MN) using an Optilux Model 401 light curing unit (Demetron Research Corp., Danbury, CT). The experimental set up consisted of a stainless steel mold having a diameter of 6 mm x 3 mm depth placed over a mylar strip and a type J thermocouple. The assembly was held at 37/spl deg/C. Three sets of measurements were taken in triplicate for the conditions: A) no material; B) bonding agent; C) bonding agent + 2 mm composite. Temperatures were recorded after exposure to the light for 10, 20, 30 and 40 seconds and are given in a table. The temperature increase was significant for each group. The largest temperature increase was 42.5/spl deg/C when no material was present. Placement of the bonding agent gave a maximum temperature increase of 31.6/spl deg/C while curing of the composite gave only a 9.5/spl deg/C increase due to its ability to act as an insulator. These results suggest that curing of bonding agents in deep restorations may expose the dentin surface to significant temperature increases even though the light source may be 3 mm from the exposed surface.","PeriodicalId":332563,"journal":{"name":"Proceedings of the 1995 Fourteenth Southern Biomedical Engineering Conference","volume":"66 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1995-04-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124247701","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Development of an athlete/shoe/surface-related injury prediction model for American football. 1. Systematic identification of qualitative and quantitative variables 橄榄球运动员/球鞋/表面损伤预测模型的建立。1. 系统地识别定性和定量变量

Proceedings of the 1995 Fourteenth Southern Biomedical Engineering Conference Pub Date : 1995-04-07 DOI: 10.1109/SBEC.1995.514464

A. Fendley

引用次数: 2

A hydroxyapatite ceramic matrix device for continuous delivery of coumadin 香豆素连续输送用羟基磷灰石陶瓷基质装置

Proceedings of the 1995 Fourteenth Southern Biomedical Engineering Conference Pub Date : 1995-04-07 DOI: 10.1109/SBEC.1995.514452

K. Leuenberger, I. Mileti, R. Singh, P. K. Bajpai

{"title":"A hydroxyapatite ceramic matrix device for continuous delivery of coumadin","authors":"K. Leuenberger, I. Mileti, R. Singh, P. K. Bajpai","doi":"10.1109/SBEC.1995.514452","DOIUrl":"https://doi.org/10.1109/SBEC.1995.514452","url":null,"abstract":"Coumadin is one of the most widely used oral anticoagulants for preventing several types of thromboembolic complications. However, coumadin, when given in dosages which maintain the plasma levels slightly above the effective threshold, has been associated with severe side effects such as excessive hemorrhaging and necrosis. Development of an implantable, biodegradable hydroxyapatite ceramic device for continuous delivery of effective amounts of coumadin should alleviate these side effects. The ceramic devices used in this experiment consisted of 400 mg HA and 100 mg coumadin compressed at loads of 3000, 6000, and 9000 lbs. in a hydraulic press. The ceramic devices released their entire anticoagulant content within 12 hours, with a linear release for the first four hours. Ceramics compressed at different loads released significantly different amounts of coumadin for the first four hours of the experiment. Since the amounts of drug released in one day in vitro are released for almost 10 to 15 days in vivo, the data obtained in this study suggest that hydroxyapatite ceramic matrix implants containing 100 mg coumadin should release the anticoagulant continuously for a minimum of 10 days in vivo.","PeriodicalId":332563,"journal":{"name":"Proceedings of the 1995 Fourteenth Southern Biomedical Engineering Conference","volume":"30 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1995-04-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120918596","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Tissue engineering with the use of polymers 使用聚合物的组织工程

Proceedings of the 1995 Fourteenth Southern Biomedical Engineering Conference Pub Date : 1995-04-07 DOI: 10.1109/SBEC.1995.514461

Y. Ikada

{"title":"Tissue engineering with the use of polymers","authors":"Y. Ikada","doi":"10.1109/SBEC.1995.514461","DOIUrl":"https://doi.org/10.1109/SBEC.1995.514461","url":null,"abstract":"Summary form only received. The author presents some results by obtained by collaborative work with medical people on tissue engineering using resorbable polymers such as polylactides and collagen. The tissues studied for regeneration include bones, skin, ligaments, and fibrous cartilage. The fixation of fractured bones in joints, jaw, and the face was performed using screws, pins, and mini-plates prepared from a high-strength poly(L-lactide). Regeneration of lost mandibula with the help of a poly(L-lactide) tray containing the patient's cancellous bone is currently undergoing clinical trials. A bilayered artificial skin was fabricated from a thin silicone sheet and a thick porous collagen sheet without glycosaminoglycans. The artificial skin functioned very effectively as the scaffold for the regeneration of the dermis tissue of full skin-deficient patients. The epidermis graft of patient origin was covered on the regenerated dermis to enable regeneration of the whole skin. Regeneration of broken anterior cruciate ligaments was attempted with the use of poly(L-lactide) fibers. The results with goats and sheep were as good as those of a non-resorbable ligament assist device. The periodontic ligament also could be regenerated with the use of a glycolide-lactide copolymer membrane.","PeriodicalId":332563,"journal":{"name":"Proceedings of the 1995 Fourteenth Southern Biomedical Engineering Conference","volume":"32 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1995-04-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122813330","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Evaluation of unalloyed titanium implant surfaces 非合金钛种植体表面的评价

Proceedings of the 1995 Fourteenth Southern Biomedical Engineering Conference Pub Date : 1995-04-07 DOI: 10.1109/SBEC.1995.514434

D. Kilpadi, G. N. Raikar, R. Connatser, J. Liu, J. Lemons, J. Gregory, Y. Vohra

引用次数: 1

Textile composite wound dressing 纺织复合敷料

Proceedings of the 1995 Fourteenth Southern Biomedical Engineering Conference Pub Date : 1995-04-07 DOI: 10.1109/SBEC.1995.514414

A. London, A. Tonelli, S. Hudson, B. Gupta, K.B. Wylie, G. Spodnick, B. Sheldon

引用次数: 4