Biorheology. Supplement : the official journal of the International Society of Biorheology最新文献_第4页

The hematocrit-electrolyte-concentration-apparatus (HECA). 血细胞比容-电解质浓度仪(HECA)。

Biorheology. Supplement : the official journal of the International Society of Biorheology Pub Date : 1984-01-01 DOI: 10.3233/bir-1984-23s128

H Kiesewetter, C Mrowietz, H Lazar, F Jung

引用次数: 1

Some new developments in the rheology of bone. 骨流变学的一些新进展。

Biorheology. Supplement : the official journal of the International Society of Biorheology Pub Date : 1984-01-01 DOI: 10.3233/bir-1984-23s130

M Johnson, J L Katz

{"title":"Some new developments in the rheology of bone.","authors":"M Johnson, J L Katz","doi":"10.3233/bir-1984-23s130","DOIUrl":"https://doi.org/10.3233/bir-1984-23s130","url":null,"abstract":"Bone has been shown to be a viscoelastic material which is thermorheologically complex. This implies that multiple mechanisms determine the viscoelastic response of bone. New calculations of the contribution of fluid flow to the viscoelastic behavior of bone have been made. The calculation of the relaxation time was based on Biot's model for the relaxation of fluid flow in porous materials while the relaxation strength was estimated from simple composite models. These models together with recent measurements of the permeability of bone predict that part of the relaxation due to fluid flow will occur at fairly high frequencies, perhaps above 10 kHz for in vitro samples. Measurements of ultrasonic wave propagation and attenuation in wet bone have been performed from 0.5 MHz to 15 MHz and the mechanical damping was measured from 100 Hz to 1 kHz with fluid viscosities ranging from 10(-3) to 5 X 10(-2) (MKS). However, a complete understanding of the rheological properties of bone will require additional experiments to bridge the gap between the low frequency measurements and the ultrasonic measurements.","PeriodicalId":79205,"journal":{"name":"Biorheology. Supplement : the official journal of the International Society of Biorheology","volume":"1 ","pages":"169-74"},"PeriodicalIF":0.0,"publicationDate":"1984-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.3233/bir-1984-23s130","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"17647990","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: 10

Comparison of geometrical models for evaluating left ventricular wall motion from cineangiograms. 电影血管造影评价左室壁运动的几何模型比较。

Biorheology. Supplement : the official journal of the International Society of Biorheology Pub Date : 1984-01-01 DOI: 10.3233/bir-1984-23s131

P Lorente, I Azancot, C Masquet, J L Adda, R Saumont, R Slama

{"title":"Comparison of geometrical models for evaluating left ventricular wall motion from cineangiograms.","authors":"P Lorente, I Azancot, C Masquet, J L Adda, R Saumont, R Slama","doi":"10.3233/bir-1984-23s131","DOIUrl":"https://doi.org/10.3233/bir-1984-23s131","url":null,"abstract":"Regional wall motion of the left ventricle (LV) has been analyzed from contrast ventriculograms by using 4 methods based on different geometrical frameworks. Two of them utilize moving internal reference systems, the center of mass (CMM) and the long axis (LAM) methods; the two other ones use fixed external reference systems, the area-based (ABM) and the Palo Alto (PAM) methods. The techniques were applied on a set of 81 patients: 42 were normal and composed the group I; 22 had a single vessel obstruction greater than 75% of the left anterior descending coronary artery (group II) with old necrosis or active ischemia of the LV anterior wall; 17 had a single vessel obstruction greater than 75% of the right coronary artery (group III) with old necrosis or active ischemia of the LV inferior wall. ABM and PAM showed the highest specificities and sensitivities on the studied sample. Therefore, we believe these two methods, of the techniques tested, are the best to quantitate wall motion from cineangiograms.","PeriodicalId":79205,"journal":{"name":"Biorheology. Supplement : the official journal of the International Society of Biorheology","volume":"1 ","pages":"175-82"},"PeriodicalIF":0.0,"publicationDate":"1984-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.3233/bir-1984-23s131","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"17647991","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 technique for continuously measuring filtration resistance at constant pressure. 一种在恒压下连续测量过滤阻力的技术。

Biorheology. Supplement : the official journal of the International Society of Biorheology Pub Date : 1984-01-01

C Duvivier, J P Arnould, E Malher, C Fourneau, J F Stoltz

引用次数: 0

The OP-Rheometer system, a new device for analysis of viscosity and viscoelasticity of blood: description and clinical application. op -流变仪系统是一种用于血液粘度和粘弹性分析的新装置:描述及临床应用。

Biorheology. Supplement : the official journal of the International Society of Biorheology Pub Date : 1984-01-01 DOI: 10.3233/bir-1984-23s106

Y Isogai, T Yokose, T Maeda, M Akiyama, S Onogi, T Masuda, T Ohmachi, S Iwamoto

引用次数: 0

A new viscoelastometer for studying the rheological properties of bronchial mucus in clinical practice. 一种用于临床研究支气管黏液流变特性的新型粘弹性计。

Biorheology. Supplement : the official journal of the International Society of Biorheology Pub Date : 1984-01-01 DOI: 10.3233/bir-1984-23s121

C Duvivier, J Didelon, J P Arnould, J M Zahm, E Puchelle, C Kopp, B Obrecht

{"title":"A new viscoelastometer for studying the rheological properties of bronchial mucus in clinical practice.","authors":"C Duvivier, J Didelon, J P Arnould, J M Zahm, E Puchelle, C Kopp, B Obrecht","doi":"10.3233/bir-1984-23s121","DOIUrl":"https://doi.org/10.3233/bir-1984-23s121","url":null,"abstract":"In clinical practice, a wide variety of drugs are given to modify the rheological properties of bronchial mucus but they are frequently not correctly chosen because there is not a simple apparatus available for the routine measurement of the mucus viscoelasticity. We designed a new viscoelastometer which is easy to operate and permit accurate measurement of the viscoelastic properties of mucus. The system has a Couette geometry and requires a sample of 1 ml. The outer cylinder is thermostated and rotates at a constant rate. The resulting torque is measured on the inner cylinder using a microdisplacement transducer. The inner cylinder is suspended by a special wire system which maintains a constant 0.75 mm gap between the two cylinders. The apparent viscosity is calculated up to 100 Pa.s. at a low shear rate (0.4 s-1) and the elasticity is analyzed by a stress relaxation method. The characteristics of the apparatus and the typical viscoelasticity behaviour of several sputum samples are reported.","PeriodicalId":79205,"journal":{"name":"Biorheology. Supplement : the official journal of the International Society of Biorheology","volume":"1 ","pages":"119-22"},"PeriodicalIF":0.0,"publicationDate":"1984-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.3233/bir-1984-23s121","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"17648311","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: 16

Dependency of red blood cell passage time on pore geometry in the single-pore erythrocyte rigidometer (SER). 单孔红细胞硬度计(SER)中红细胞通过时间与孔几何的关系。

Biorheology. Supplement : the official journal of the International Society of Biorheology Pub Date : 1984-01-01 DOI: 10.3233/bir-1984-23s142

D Seiffge

引用次数: 3

Viscometric methods for assessing red cell deformability and fragmentation. 评价红细胞可变形性和破碎性的粘度法。

Biorheology. Supplement : the official journal of the International Society of Biorheology Pub Date : 1984-01-01 DOI: 10.3233/bir-1984-23s153

L Berga, J Dolz, J L Vives-Corrons, E Feliu, C Rozman

{"title":"Viscometric methods for assessing red cell deformability and fragmentation.","authors":"L Berga, J Dolz, J L Vives-Corrons, E Feliu, C Rozman","doi":"10.3233/bir-1984-23s153","DOIUrl":"https://doi.org/10.3233/bir-1984-23s153","url":null,"abstract":"Erythrocyte deformability is an important determinant of red cell life span and depends on at least three key factors: shape, internal viscosity and membrane mechanical properties. In this paper we describe three viscometric methods for assessing red cell deformability and fragmentation: 1) Plasma and whole blood are sheared with a coneplate viscometer at high shear rates. A mathematical model for liquid behaviour is applied to the results from plasma and whole blood viscosity, and a rheological parameter called internal viscosity is obtained. 2) Shearing packed red cells (Haematocrit greater than or equal to 95%) at high shear rates, a mechanical fragmentation curve is obtained, and a new rheological parameter called rupture stress is determined. 3) Shearing whole blood at 230 Sec-1 and increasing continuously the temperature from 37 degrees C to 57 degrees C, a thermic curve is obtained. A viscosity increase is observed at about 48 degrees C and thermic curve changes are related to effects of heat on the red cell membrane. Internal viscosity, mechanical fragmentation curve and thermic curve assess red cell deformability and fragmentation and can be used as diagnostic tools in diseases with red cell abnormalities.","PeriodicalId":79205,"journal":{"name":"Biorheology. Supplement : the official journal of the International Society of Biorheology","volume":"1 ","pages":"297-301"},"PeriodicalIF":0.0,"publicationDate":"1984-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.3233/bir-1984-23s153","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"17647767","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

Investigation of human blood platelets with fluorescence spectroscopy. 荧光光谱法测定人血小板。

Biorheology. Supplement : the official journal of the International Society of Biorheology Pub Date : 1984-01-01 DOI: 10.3233/bir-1984-23s158

M L Viriot, T Collin, S Gaillard, J F Stoltz, J C Andre

引用次数: 0

Harmonic and impulse rheological tests of biomaterials. 生物材料的谐波和脉冲流变试验。

Biorheology. Supplement : the official journal of the International Society of Biorheology Pub Date : 1984-01-01 DOI: 10.3233/bir-1984-23s133

D Geiger, D Trevisan, M Bercovy, C Oddou

{"title":"Harmonic and impulse rheological tests of biomaterials.","authors":"D Geiger, D Trevisan, M Bercovy, C Oddou","doi":"10.3233/bir-1984-23s133","DOIUrl":"https://doi.org/10.3233/bir-1984-23s133","url":null,"abstract":"Up to now, not so much attention has been paid concerning the dynamic rheological behaviour of soft tissues although non linear viscoelastic effects have often been reported when mechanical properties of biomaterials are concerned. In order to characterize such properties different rheological tests have been proposed, the two principal being the study of the sample stresses responses to applied strains which are either harmonic with time or of step function type. Two different apparatus have been designed in our laboratory which allow specific rheological tests on biological materials under controlled environmental conditions. With one of them, harmonic uniaxial extension tests are performed in a large domain of frequencies (.001 Hz to 100 Hz) and forces (up to 20 daN); with the other, the samples are submitted to relaxation tests in uniaxial elongation up to 5 cm deformation within time duration of the order of 20 ms. The principal characteristics, limitations and performances of such apparatus are presented and few examples of data thus obtained are given. On the basis of quasi linear viscoelasticity models, it can be shown that both two types of tests with their proper limitations are leading to the same rheological parameters.","PeriodicalId":79205,"journal":{"name":"Biorheology. Supplement : the official journal of the International Society of Biorheology","volume":"1 ","pages":"193-200"},"PeriodicalIF":0.0,"publicationDate":"1984-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.3233/bir-1984-23s133","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"17647856","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