发布求助
文献互助 智能选刊 最新文献

中国地球物理学会年刊最新文献

筛选
英文 中文
Identification of left ventricular volume regulation on the basis of the elastance concept 基于弹性概念识别左心室容积调节
中国地球物理学会年刊 Pub Date : 2002-12-01 DOI: 10.1109/IEMBS.2002.1106354
P. Kerkhof, J.K. Li
{"title":"Identification of left ventricular volume regulation on the basis of the elastance concept","authors":"P. Kerkhof, J.K. Li","doi":"10.1109/IEMBS.2002.1106354","DOIUrl":"https://doi.org/10.1109/IEMBS.2002.1106354","url":null,"abstract":"Left ventricular interaction with arterial load has been described in terms of the ratio (k) of effective arterial elastance (Ea) and maximal systolic elastance (Emax). Using the definition formulas for both elastances, a linear relationship between end-systolic volume (ESV) and end-diastolic volume (EDV) can be derived. The slope of this linearity equals k/(k+1), while the intercept can be identified as Vo/(k+1) where Vo is the extrapolated volume intercept of the linearized Emax-concept. Since the ESV vs EDV relationship refers to ventricular volume regulation, we have demonstrated that its characteristics can be exclusively expressed in terms of the coupling index k and the intercept Vo. We conclude that k and Vo are important determinants of the regulation of ventricular volume.","PeriodicalId":60385,"journal":{"name":"中国地球物理学会年刊","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2002-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89871072","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: 4
Nonlinear dielectric spectroscopy of living cell suspensions 活细胞悬浮液的非线性介电光谱
中国地球物理学会年刊 Pub Date : 2002-12-01 DOI: 10.1109/IEMBS.2002.1106594
J. R. Claycomb, C. Prodan, D. Nawarathna, J.H. Miller
{"title":"Nonlinear dielectric spectroscopy of living cell suspensions","authors":"J. R. Claycomb, C. Prodan, D. Nawarathna, J.H. Miller","doi":"10.1109/IEMBS.2002.1106594","DOIUrl":"https://doi.org/10.1109/IEMBS.2002.1106594","url":null,"abstract":"We report the results of nonlinear dielectric spectroscopy measurements of living cell suspensions. The experiments are carried out at low excitation frequency (kHz) and signal amplitude of several V/cm. Harmonics in the cell response are monitored after glucose is added.","PeriodicalId":60385,"journal":{"name":"中国地球物理学会年刊","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2002-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77852367","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: 3
Breaking the speed limit in magnetic resonance imaging: an introduction to parallel MRI 突破核磁共振成像的速度限制:平行核磁共振的介绍
中国地球物理学会年刊 Pub Date : 2002-12-01 DOI: 10.1109/IEMBS.2002.1106332
D. Sodickson
{"title":"Breaking the speed limit in magnetic resonance imaging: an introduction to parallel MRI","authors":"D. Sodickson","doi":"10.1109/IEMBS.2002.1106332","DOIUrl":"https://doi.org/10.1109/IEMBS.2002.1106332","url":null,"abstract":"Parallel magnetic resonance imaging techniques use spatial information from arrays of radiofrequency detector coils to accelerate imaging. A number of parallel MRI techniques have been described in recent years, and numerous clinical applications are currently being explored. The advent of practical parallel imaging presents various challenges for image reconstruction and RF system design.","PeriodicalId":60385,"journal":{"name":"中国地球物理学会年刊","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2002-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77994546","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
Body electrical impedance measurements: body fat or body fluid? 身体电阻抗测量:身体脂肪还是体液?
中国地球物理学会年刊 Pub Date : 2002-12-01 DOI: 10.1109/IEMBS.2002.1106632
R. Patterson
{"title":"Body electrical impedance measurements: body fat or body fluid?","authors":"R. Patterson","doi":"10.1109/IEMBS.2002.1106632","DOIUrl":"https://doi.org/10.1109/IEMBS.2002.1106632","url":null,"abstract":"An electrical impedance measuring scale (Tanita Model TBF-551) was used to make repeated estimations of the body fat of an adult male subject undergoing dietary changes that resulted in a 4.7 kg weight increase. The results showed that the body fat decreased approximately 3 kg with the weight gain. Over a period of five days of normal diet and activity the body fat change returned to the control condition. It appeared the weight gain was caused mainly by fluid changes not a body fat increase. The results suggest serious errors can occur in body fat estimates based on body impedance measurements, but use as a fluid change indicator may be possible.","PeriodicalId":60385,"journal":{"name":"中国地球物理学会年刊","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2002-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78049571","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: 2
Metabolic profiling: definition and use in physiological state classification 代谢谱:定义及其在生理状态分类中的应用
中国地球物理学会年刊 Pub Date : 2002-12-01 DOI: 10.1109/IEMBS.2002.1053246
K. Lee, D. Hwang, M. Yarmush, G. Stephanopoulos
{"title":"Metabolic profiling: definition and use in physiological state classification","authors":"K. Lee, D. Hwang, M. Yarmush, G. Stephanopoulos","doi":"10.1109/IEMBS.2002.1053246","DOIUrl":"https://doi.org/10.1109/IEMBS.2002.1053246","url":null,"abstract":"Metabolic profiling analyses were performed on metabolite measurements and intracellular fluxes obtained in liver models of injury. Classification of physiological states by projection based discrimination improved with increasing metabolite measurement number and addition of fluxes.","PeriodicalId":60385,"journal":{"name":"中国地球物理学会年刊","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2002-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76256164","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: 2
In vitro dynamic strain analysis on porcine mitral valve 猪二尖瓣体外动态应变分析
中国地球物理学会年刊 Pub Date : 2002-12-01 DOI: 10.1109/IEMBS.2002.1106369
Z. He, L. Baijens, S. Wanant, P. Shah, S. He, B. Sugimoto, M. Sacks, A. Yoganathan
{"title":"In vitro dynamic strain analysis on porcine mitral valve","authors":"Z. He, L. Baijens, S. Wanant, P. Shah, S. He, B. Sugimoto, M. Sacks, A. Yoganathan","doi":"10.1109/IEMBS.2002.1106369","DOIUrl":"https://doi.org/10.1109/IEMBS.2002.1106369","url":null,"abstract":"Dual camera stereo photogrammetry was used to quantify the deformation of the central region of the anterior leaflet: of the mitral valve operating in a flow loop under physiological and pathological conditions. Stretches and strains were measured and analyzed. The principal stretches demonstrated a rapid rise early in leaflet closure, followed by a plateau, suggesting that the collagen fibers \"locked\" in place. There is a big difference between the major principal stretch and minor principal stretch. Similar to in-vitro tissue mechanics studies, the transmitral pressure-areal strain relationship during loading and unloading clearly demonstrated hysteresis. Further, this relationship demonstrated a dramatic stiffening attributed to collagen fiber locking. When the data of 3 papillary muscle positions were compared, the leaflet in the slack papillary position showed the highest areal strain rate. The valve exhibited a strongly anisotropic behavior. Papillary muscle position had a small effect on strain measured in the region.","PeriodicalId":60385,"journal":{"name":"中国地球物理学会年刊","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2002-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74171189","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
Dynamics of surface receptor interactions required for an immune response 免疫应答所需的表面受体相互作用动力学
中国地球物理学会年刊 Pub Date : 2002-12-01 DOI: 10.1109/IEMBS.2002.1134527
V. K. Thomas, Jianhua Wu, C. Zhu, Michael Loran Dustin
{"title":"Dynamics of surface receptor interactions required for an immune response","authors":"V. K. Thomas, Jianhua Wu, C. Zhu, Michael Loran Dustin","doi":"10.1109/IEMBS.2002.1134527","DOIUrl":"https://doi.org/10.1109/IEMBS.2002.1134527","url":null,"abstract":"We have applied a new method for measuring two dimensional kinetic rates to the study the interactions between receptor important for the regulation of the immune response. The interaction of Cluster of Differentiation (CD) 28 with CD80 stimulates T cell activation, while the interaction of Cytotoxic T Lymphocyte Antigen (CTLA)-4 with CD80 is an antagonist to T cell activation. The new analysis provides information about free ligand diffusion in the contact area, the fraction of interactions that are stable and the kinetic off-rate. Independent data from equilibrium measurements are used to calculate the on-rate. The values for CD28-CD80 interaction reveal a 10-fold reduction in free CD80 diffusion, a small stable fraction of 9.6% and a 2D k/sub r/ of 0.057 s/sup -1/. This compares to an off-rate of 1.6 s/sup -1/ in solution, a difference of 30-fold. The CTLA-4-CD28 system is under analysis, but appears to have slower kinetics, requiring very long recovery time courses for analysis.","PeriodicalId":60385,"journal":{"name":"中国地球物理学会年刊","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2002-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74493368","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
Effects of tissue stretching or cell shrinkage on penetration depth of macromolecules in a rat fibrosarcoma 大鼠纤维肉瘤组织拉伸或细胞收缩对大分子穿透深度的影响
中国地球物理学会年刊 Pub Date : 2002-12-01 DOI: 10.1109/IEMBS.2002.1136925
S. Mcguire, F. Yuan
{"title":"Effects of tissue stretching or cell shrinkage on penetration depth of macromolecules in a rat fibrosarcoma","authors":"S. Mcguire, F. Yuan","doi":"10.1109/IEMBS.2002.1136925","DOIUrl":"https://doi.org/10.1109/IEMBS.2002.1136925","url":null,"abstract":"Interstitial penetration is critical for drug delivery in tumor tissues. To experimentally determine the penetration depth of macromolecules at the steady state, rat fibrosarcoma tissues were sectioned into 600 /spl mu/m slices and incubated in solutions of dextrans with molecular weights of 10 kDa, 70 kDa, and 2000 kDa, respectively. After incubation, 10 /spl mu/m cross-sections were taken and imaged to determine normalized steady-state concentration profiles as a function of molecular size. 10 kDa dextran had a relatively uniform concentration distribution. However, the concentration profile was nonuniform for 70 kDa dextran and the least uniform for 2000 kDa dextran. Stretching or incubation of tissues in 1 M mannitol solution improved the penetration of macromolecules in tissues. These results indicate that creating more interstitial space by either stretching or reducing cell size improves macromolecule distribution in tissues.","PeriodicalId":60385,"journal":{"name":"中国地球物理学会年刊","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2002-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74656965","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
Neural excitation patterns of four cochlear implant electrode array configurations 四种人工耳蜗电极阵列配置的神经兴奋模式
中国地球物理学会年刊 Pub Date : 2002-12-01 DOI: 10.1109/IEMBS.2002.1134487
C. Choi, Y.P. Chen
{"title":"Neural excitation patterns of four cochlear implant electrode array configurations","authors":"C. Choi, Y.P. Chen","doi":"10.1109/IEMBS.2002.1134487","DOIUrl":"https://doi.org/10.1109/IEMBS.2002.1134487","url":null,"abstract":"Although there are a lot of studies of the cochlear implant, there is no study directly compare the current focus performance and the neural excitation patterns of different cochlear implant electrode design. Volume conduction analyses using 3D finite element method and nerve fiber model were used to evaluate the neural excitation patterns of the ball electrodes, banded electrodes, half banded electrodes, and planar electrodes for the first half turn of a human cochlea model for monopolar, common mode, bipolar, and tripolar stimulating modes.","PeriodicalId":60385,"journal":{"name":"中国地球物理学会年刊","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2002-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80855386","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: 3
Fiber-based phase-sensitive optical low coherence reflectometer for birefringence imaging of nerves 用于神经双折射成像的光纤相敏光学低相干反射计
中国地球物理学会年刊 Pub Date : 2002-12-01 DOI: 10.1109/IEMBS.2002.1053292
T. Akkin, H. Rylander, D. Dave, T. Milner
{"title":"Fiber-based phase-sensitive optical low coherence reflectometer for birefringence imaging of nerves","authors":"T. Akkin, H. Rylander, D. Dave, T. Milner","doi":"10.1109/IEMBS.2002.1053292","DOIUrl":"https://doi.org/10.1109/IEMBS.2002.1053292","url":null,"abstract":"A fiber based dual channel phase-sensitive optical low coherence tomography system is proposed for birefringence imaging neural tissues. The system measures relative optical path length differences between the orthogonal modes of the polarization-maintaining fiber in highly scattering media with high lateral and longitudinal spatial resolution. Because of the ability of detecting ultra-small changes in refractive index, system has uses in many bio-medical optical imaging applications such as monitoring cell and tissue dynamics, imaging of phase objects, and functional studies.","PeriodicalId":60385,"journal":{"name":"中国地球物理学会年刊","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2002-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74545435","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
首页 上一页 下一页 尾页
0
×
引用
GB/T 7714-2015
复制
MLA
复制
APA
复制
导出至
BibTeX EndNote RefMan NoteFirst NoteExpress
×
提示
您的信息不完整，为了账户安全，请先补充。
现在去补充
×
提示
您因"违规操作"
具体请查看互助需知
我知道了
×
提示
现在去查看 取消
×
提示
确定
请完成安全验证×
相关产品
×
本文献相关产品
联系我们：info@booksci.cn Book学术提供免费学术资源搜索服务，方便国内外学者检索中英文文献。致力于提供最便捷和优质的服务体验。 Copyright © 2023 布克学术 All rights reserved.
京ICP备2023020795号-1
ghs 京公网安备 11010802042870号
Book学术文献互助
Book学术文献互助群
群 号：481959085
Book学术官方微信