Biorheology - Volume 12, issue 6

Authors: Bauckhage, K.

Article Type: Research Article

DOI: 10.3233/BIR-1975-12601

Citation: Biorheology, vol. 12, no. 6, pp. 329-334, 1975

Authors: Healy, J.C. | Joly, M.

Article Type: Research Article

DOI: 10.3233/BIR-1975-12602

Citation: Biorheology, vol. 12, no. 6, pp. 335-340, 1975

Authors: Chien, S. | King, R.G. | Skalak, R. | Usami, S. | Copley, A.L.

Article Type: Research Article

DOI: 10.3233/BIR-1975-12603

Citation: Biorheology, vol. 12, no. 6, pp. 341-346, 1975

Authors: Flaud, P. | Geiger, D. | Odou, C. | Quemada, D.

Article Type: Research Article

DOI: 10.3233/BIR-1975-12604

Citation: Biorheology, vol. 12, no. 6, pp. 347-354, 1975

Authors: King, R.G. | Copley, A.L.

Article Type: Research Article

DOI: 10.3233/BIR-1975-12605

Citation: Biorheology, vol. 12, no. 6, pp. 355-360, 1975

Authors: Victor, S.A. | Shah, V.L.

Article Type: Research Article

DOI: 10.3233/BIR-1975-12606

Citation: Biorheology, vol. 12, no. 6, pp. 361-368, 1975

Authors: Macagno, Enzo | Melville, Joel | Christensen, James

Article Type: Research Article

Abstract: Longitudinal motility of the small intestine is an instance of smooth muscle activity. Its correlation with the characteristics of the electrical slow wave of the intestine is of fundamental importance in understanding the behavior of the intestine and its functions. From a fluid-mechanical point of view, the small intestine is an organ which acts on the chyme in its interior to generate several flow processes which are deterministically related to the wall motion. In this paper, a simple model for the longitudinal motion of the intestinal wall is formulated and applied to predict the behavior of the intestine in a …particular experimental situation. Theoretical results and data from in vitro experiments in which purely longitudinal motility was obtained show a satisfactory agreement. Show more

DOI: 10.3233/BIR-1975-12607

Citation: Biorheology, vol. 12, no. 6, pp. 369-376, 1975

Authors: Greene, Howard L. | Madan, Shree R.

Article Type: Research Article

Abstract: The effects of drag reducing polymers on blood hemolysis during extracorporeal circulation with a prototype roller pump reveal several polymers of both the modified polysaccharide and cellulose types to be capable of effecting significant decreases in red cell breakage at concentrations between 200–500 ppm. First normal stress measurements on dilute solutions of these polymers suggest that the phenomenon may correlate with level of fluid viscoelasticity.

DOI: 10.3233/BIR-1975-12608

Citation: Biorheology, vol. 12, no. 6, pp. 377-382, 1975

Authors: Phillips, W.M. | Deutsch, S.

Article Type: Research Article

Abstract: A non-linear viscoelastic constitutive equation is proposed as a model for blood. The model allows normal stress effects which are observed to occur in viscoelastic fluids but not included in most rheological models for blood. The shear thinning nature of the model is illustrated by its application in circular Couette flow. A two-dimensional channel flow problem is included to show that a blunted profile can be predicted. Finally, application to the Couette flow viscometer problem shows that a stress overshoot is predicted by the viscoelastic model proposed without the need for a postulate of a cell-free layer.

DOI: 10.3233/BIR-1975-12609

Citation: Biorheology, vol. 12, no. 6, pp. 383-389, 1975

Authors: Marriott, Christopher | Kellaway, Ian W.

Article Type: Research Article

Abstract: Non destructive creep compliance tests have been used to investigate the effects of tetracycline antibiotics on the physical properties of human bronchial mucus in vitro . Oxytetracycline, tetracycline, chlortetracycline and demethylchlortetracycline resulted in an increase in consistency of the mucus which was produced by homogenisation of the gel phase. In contrast pyrrolidinomethyltetracycline reduced the residual shear viscosity (η 0 ) and increased the instantaneous shear compliance (J 0 ). Neither the hydrogen ion concentration of the antibiotic solutions nor the chelation of calcium within the gel could be shown to account for the observed results. It is concluded that tetracycline-glycoprotein …interactions may provide a possible explanation of the reported changes. Show more

DOI: 10.3233/BIR-1975-12610

Citation: Biorheology, vol. 12, no. 6, pp. 391-395, 1975

Authors: Fitzgerald, Edwin R.

Article Type: Research Article

Abstract: Changes in the mechanical properties of animal tissues with time after death have been frequently observed, and descriptions of rigor mortis for example are numerous. Most previous accounts of mechanical changes in tissues during the life-to-death transition, however, are qualitative. Measurements of dynamic shear compliance vs dead time at room temperatures are reported here for cow gluteal muscle, several samples of rabbit and human cancellous bone, and dog intervertebral disks. In all cases an abrupt second-order transition is observed in one or both components of the audiofrequency complex shear compliance, J ∗ = J ′ …− i J ″ at 5–6 hr after death; this is considered to be an indication of the life-to-death transition in animal tissues. Show more

DOI: 10.3233/BIR-1975-12611

Citation: Biorheology, vol. 12, no. 6, pp. 397-408, 1975