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Two applications of photoacoustic spectroscopy to measurements in dermatology. 光声光谱在皮肤病学测量中的两个应用。
Journal of bioengineering Pub Date : 1977-08-01
S D Campbell, S S Yee, M A Afromowitz
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引用次数: 0
Diffusion of fluoride ions in dental enamel at pH 7: a theoretical model. pH值为7时氟离子在牙釉质中的扩散:一个理论模型。
Journal of bioengineering Pub Date : 1977-08-01
G J Flim, Z Kolar, J Arends
{"title":"Diffusion of fluoride ions in dental enamel at pH 7: a theoretical model.","authors":"G J Flim, Z Kolar, J Arends","doi":"","DOIUrl":"","url":null,"abstract":"","PeriodicalId":75990,"journal":{"name":"Journal of bioengineering","volume":"1 3","pages":"207-13"},"PeriodicalIF":0.0,"publicationDate":"1977-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"11251399","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
Use of enzymolysis techniques in studying the mechanical properties of connective tissue components. 利用酶解技术研究结缔组织组分的力学性能。
Journal of bioengineering Pub Date : 1977-08-01
Y F Missirlis
{"title":"Use of enzymolysis techniques in studying the mechanical properties of connective tissue components.","authors":"Y F Missirlis","doi":"","DOIUrl":"","url":null,"abstract":"<p><p>The optimum conditions for the selective removal of elastin from connective tissues are described. The process, elastolysis, consists of incubating small samples of connective tissue in buffered saline at ph=8.6 containing 300 microgram/me of a 50-50% mixture of elastase with trypsin inhibitor, for 5-6 hours at room temperature. This process, complimented with other processes for selective removal of lipids, or mucopolysaccharides, or collagen, enables one to examine the contribution of the various components of the connective tissue to its mechanical function. The elastolysis was tested with aortic, valvular and tendon tissues from human, bovine and canine species and it was found that in tensile stress experiments, collagen was unaffected while the low-stress contribution of elastin disappeared.</p>","PeriodicalId":75990,"journal":{"name":"Journal of bioengineering","volume":"1 3","pages":"215-22"},"PeriodicalIF":0.0,"publicationDate":"1977-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"11251400","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
The preferential adsorption of hemoglobin to polyethylene. 血红蛋白对聚乙烯的优先吸附。
Journal of bioengineering Pub Date : 1977-01-01
T A Horbett, P K Weathersby, A S Hoffman
{"title":"The preferential adsorption of hemoglobin to polyethylene.","authors":"T A Horbett,&nbsp;P K Weathersby,&nbsp;A S Hoffman","doi":"","DOIUrl":"","url":null,"abstract":"<p><p>Hemoglobin adsorption to foreign surfaces has not previously been considered in studies of blood-material interactions, despite the fact that hemoglobin is the most abundant protein present in blood. A hemoglobin-like protein was detected on a number of surfaces exposed to blood plasma, serum, and red cell suspensions. Hemoglobin adsorption to polyethylene from plasma was found to approximately equal the amount of adsorption of albumin and fibrinogen. The high relative affinity of hemoglobin for polyethylene was further confirmed by adsorption isotherm and direct competition experiments. The data from all four experimental methods support the following ranking of plasma protein affinity for polyethylene: Hemoglobin greater than fibrinogen greater than albumin congruent to gamma-globulin.</p>","PeriodicalId":75990,"journal":{"name":"Journal of bioengineering","volume":"1 2","pages":"61-77"},"PeriodicalIF":0.0,"publicationDate":"1977-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"11300512","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
A flow grafting apparatus for chemically modifying the luminal surface of polymeric tubing. 一种用于化学修饰聚合物管腔表面的流动接枝装置。
Journal of bioengineering Pub Date : 1977-01-01
B D Ratner, T Balisky, A S Hoffman
{"title":"A flow grafting apparatus for chemically modifying the luminal surface of polymeric tubing.","authors":"B D Ratner,&nbsp;T Balisky,&nbsp;A S Hoffman","doi":"","DOIUrl":"","url":null,"abstract":"","PeriodicalId":75990,"journal":{"name":"Journal of bioengineering","volume":"1 2","pages":"115-20"},"PeriodicalIF":0.0,"publicationDate":"1977-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"11818129","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
Cardiovascular system simulation requirements. 心血管系统仿真要求。
Journal of bioengineering Pub Date : 1977-01-01
W M Swanson, R E Clark
{"title":"Cardiovascular system simulation requirements.","authors":"W M Swanson,&nbsp;R E Clark","doi":"","DOIUrl":"","url":null,"abstract":"<p><p>Circulatory system characteristics are considered with respect to specifying model design parameters for simulators and pulse duplicators. The requirements are investigated to determine what characteristics and parameters are important in design and construction. The specific design depends on the functions of the device to be investigated. The single most important quantity is the modeled proximal capacitance or compliance of the large vessels. More detailed study specifications require more detailed models.</p>","PeriodicalId":75990,"journal":{"name":"Journal of bioengineering","volume":"1 2","pages":"121-33"},"PeriodicalIF":0.0,"publicationDate":"1977-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"11566054","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
A simple cardiovascular system simulator: design and performance. 一个简单的心血管系统模拟器:设计与性能。
Journal of bioengineering Pub Date : 1977-01-01
W M Swanson, R E Clark
{"title":"A simple cardiovascular system simulator: design and performance.","authors":"W M Swanson,&nbsp;R E Clark","doi":"","DOIUrl":"","url":null,"abstract":"<p><p>A simple simulator has been constructed, evaluated and used for performance studies of prosthetic aortic valves, balloon assist devices and Koroktof sounds and ausculatory cuff blood pressure measurements. A direct drive piston pump is used. Elastic soft rubber tubes with distributed resistances allow modeling of normal and diseased pressure pulse waves. Pressure pulse amplitude amplification is modeled with tube segments of decreasing diameters. Satisfactory proximal pressure pulse shapes are obtained with a soft rubber tube of uniform diameter.</p>","PeriodicalId":75990,"journal":{"name":"Journal of bioengineering","volume":"1 2","pages":"135-45"},"PeriodicalIF":0.0,"publicationDate":"1977-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"11819061","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
Effect of load, speed, and activity history on the EMG signals from the intact human muscle. 负荷、速度和活动历史对完整人体肌肉肌电图信号的影响。
Journal of bioengineering Pub Date : 1977-01-01
N Miller, A Seireg
{"title":"Effect of load, speed, and activity history on the EMG signals from the intact human muscle.","authors":"N Miller,&nbsp;A Seireg","doi":"","DOIUrl":"","url":null,"abstract":"<p><p>A specially instrumented bicycle ergometer is utilized in this investigation to induce reproducable loading conditions on the muscles of the lower extremity at different speeds. Various tehcniques for evaluating the electromyographic signals from the vastas medialis muscle are investigated for different load and speed conditions and shown to be essentially equivalent. The RMS signal power computed by means of a real time spectral analyzer is shown to be a convenient means of quantification of the dynamic EMG signals. The electromyographic signals are shown to be stable under repeated static or dynamic conditions but not under sustained isometric static loading.</p>","PeriodicalId":75990,"journal":{"name":"Journal of bioengineering","volume":"1 2","pages":"147-55"},"PeriodicalIF":0.0,"publicationDate":"1977-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"11819062","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
Chemical composition, particle form and annealing temperature of amalgam alloy versus creep of the resulting amalgam. 银汞合金的化学成分、颗粒形式和退火温度对所得银汞合金蠕变的影响。
Journal of bioengineering Pub Date : 1977-01-01
M M Vrijoef, S J Jensen
{"title":"Chemical composition, particle form and annealing temperature of amalgam alloy versus creep of the resulting amalgam.","authors":"M M Vrijoef,&nbsp;S J Jensen","doi":"","DOIUrl":"","url":null,"abstract":"<p><p>The influence of the chemical composition, particle form and annealing temperature of the amalgam alloy upon the creep of the resulting amalgam was investigated by means of a multiple regression model. Because no, or only little, information was available about the heat treatments of the different commercial alloys, the alloys were subjected to additional heat treatments at four different temperatures. The influence upon the creep of the amalgam of the Zn content, particle form and annealing temperature was found to be very significant. A higher Zn content as well as a spherical alloy resulted in less creep of the corresponding amalgam. The dependence of the creep upon the annealing temperature showed a minimum: more creep was obtained for amalgams prepared from the alloys heat treated at 150 degrees C and 435 degrees C than those from the alloys annealed at 315 degrees C and 319 degrees C, respectively.</p>","PeriodicalId":75990,"journal":{"name":"Journal of bioengineering","volume":"1 2","pages":"105-12"},"PeriodicalIF":0.0,"publicationDate":"1977-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"11818127","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
The microstructure of isotropic vapor-deposited carbon films. 各向同性气相沉积碳膜的微观结构。
Journal of bioengineering Pub Date : 1977-01-01
H S Shim, C H Meyer
{"title":"The microstructure of isotropic vapor-deposited carbon films.","authors":"H S Shim,&nbsp;C H Meyer","doi":"","DOIUrl":"","url":null,"abstract":"<p><p>The structure of thin, vapor-deposited carbon films was characterized by transmission electron microscopy and electron diffraction. Selected area electron diffraction showed very weak and broad peaks, indicating that these carbons contain extremely small crystallites whose dimension in the crystallographic c-direction is about 8 to 10 a. The observed diffraction bands are (h, k, 1 = 0) type reflections, which suggests that individual crystallites consist of graphitic layer planes stacked in parallel groups but with no order between atoms in adjacent planes (turbostratic). The carbon films exhibit no preferred orientation, indicating that the small crystallites are randomly oriented in the film and that the films are therefore isotropic. The measured density (1.8 g/cm3) and the structure of the vapor-deposited carbons are accordingly similar to those of low-temperature isotropic (LTI) pyrolytic carbons.</p>","PeriodicalId":75990,"journal":{"name":"Journal of bioengineering","volume":"1 2","pages":"99-103"},"PeriodicalIF":0.0,"publicationDate":"1977-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"11819063","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
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