Biorheology - Volume 13, issue 2

Authors: Dumitresco, B. | Constantinesco, A. | Chambron, J.

Article Type: Research Article

DOI: 10.3233/BIR-1976-13201

Citation: Biorheology, vol. 13, no. 2, pp. 87-95, 1976

Authors: Lemmingson, W.

Article Type: Research Article

DOI: 10.3233/BIR-1976-13202

Citation: Biorheology, vol. 13, no. 2, pp. 97-99, 1976

Authors: Rampling, M.W. | Sirs, J.A.

Article Type: Research Article

Abstract: An investigation has been made of the variation of erythrocyte flexibility within a large healthy population. It was found that the mean values of the erythrocyte flexibility of males and females were not significantly different, but the female values were more variable than the males. A small (ca . 3%) group of subjects was found to be very significantly different from the population at large. Evidence is presented to suggest that this difference is due to a membrane abnormality.

DOI: 10.3233/BIR-1976-13203

Citation: Biorheology, vol. 13, no. 2, pp. 101-105, 1976

Authors: Litt, M. | Khan, M.A. | Chakrin, L.W. | Sosnowski, G. | Wardell Jr., J.R.

Article Type: Research Article

Abstract: The viscoelastic properties of tracheal mucus obtained from dogs equipped with a chronic tracheal pouch preparation were found to vary significantly during periods of exposure to sulfur dioxide inhalation. A biphasic response which apparently is due to variations in the ratio of high molecular weight glycoproteins to smaller serum-like proteins was observed. The response of the pouch mucosa to inhaled sulfur dioxide indicates that a neural or circulatory mechanism is probably involved, since the pouch is never directly exposed to the gas.

DOI: 10.3233/BIR-1976-13204

Citation: Biorheology, vol. 13, no. 2, pp. 107-114, 1976

Authors: Whitmore, R.L. | Stalker, A.L.

Article Type: Research Article

Abstract: The size and shape of red cells in the blood vessels of hamster cheek pouches have been studied by analysing electron micrographs of sections through the pouches. A mathematical analysis of the shapes obtained by randomly sectioning relaxed red cells led to a simple counting technique by which the size and shape of the cells could be quantitatively assessed. In the venules their mean size was: diameter 6.05 μ m, maximum thickness 2.15 μ m, minimum thickness 0.55 μ m. In the microcirculation the relaxed cells were highly deformed, probably into cups.

DOI: 10.3233/BIR-1976-13205

Citation: Biorheology, vol. 13, no. 2, pp. 115-125, 1976

Authors: Oiknine, C. | Mandret, G. | Goldmann, M.

Article Type: Research Article

Abstract: Nous avons utilisé un viscosimètre Rheomat 30, du type Couette, pour mesurer la viscosité de suspension de globules rouges pour de faibles valeurs de la vitesse de déformation. Nous montrons, qu’à condition de tenir compte des effets d’extrémités et de dépouiller soigneusement les résultats bruts, ce viscosimètre est tout à fait adapté à genre de recherches. Nos résultats sont comparés à ceut d’autres auteurs.

DOI: 10.3233/BIR-1976-13206

Citation: Biorheology, vol. 13, no. 2, pp. 127-132, 1976

Authors: Chaturani, P.

Article Type: Research Article

Abstract: Recently Valanis and Sun, Biorheology 6 , (1969), 85 have studied the Poiseuille flow with couple stress. While obtaining velocity profiles for various values of non-dimensional couple stress parameters α ¯ and η ¯ , they somehow find that for η ¯ = 0.5 the critical value of α ¯ , for which flow velocity is identically zero, is 0.45. Our numerical computations show that the flow velocity is not identically zero for these values of α ¯ …and η ¯ . Figures 4 and 7 of (Valanis, K.C. and Sun, C.T. Biorheology 6 , (1969), 85) clearly indicate that the critical value of α ¯ depends on η ¯ . In the present note, it is analytically shown that the critical value of α ¯ is zero and it is independent of η ¯ . Due to this almost all the figures of (Valanis, K.C. and Sun, C.T. Biorheology 6 , (1969), 85) will change; the corresponding correct figures are given and the conclusions are accordingly modified. Show more

DOI: 10.3233/BIR-1976-13207

Citation: Biorheology, vol. 13, no. 2, pp. 133-136, 1976

Authors: Mostardi, Richard A. | Greene, Howard L. | Nokes, Richard F. | Thomas, Lindon C. | Lue, Tammy

Article Type: Research Article

Abstract: Surgical procedures developed on a series of mongrel dogs. wherehy a hot film anemometer probe was inserted in the left renal artery nearly flush with the wall of the descending aorta, have allowed measurements of aortic wall flow disturbance distal to an artificially created partial occlusion. Results show that the presence of a soluble drag reducing polymer (Separan AP-30) in the blood causes an increase in disturbance periodicity (or decrease in frequency) averaging 60% with polymer concentrations of ca. 62 ppm. This result is in substantial agreement with current theoretical developments which predict that drag reducing flow behavior may …hinder, and in some cases prevent, the traumatic process of flow separation and reattachment. Application to current hemodynamic theories of atherogenesis suggests that reductions in local arterial wall disturbance levels may lead to a retardation in the development of atheroma. Show more

DOI: 10.3233/BIR-1976-13208

Citation: Biorheology, vol. 13, no. 2, pp. 137-141, 1976

Authors: Reis, A. | Kirmaier, N.

Article Type: Research Article

Abstract: There are several types of illness leading to changes in the viscosity of blood, plasma or serum. Determination of the viscosity alone, therefore, will not make possible an unambiguous diagnosis of any particular complaint. However, determination of the viscosity–temperature correlation in blood serum, in addition to conventional diagnostic means, can lead to more accurate diagnostic information. This is explained by the dependence of viscosity on certain physio-chemical factors.

DOI: 10.3233/BIR-1976-13209

Citation: Biorheology, vol. 13, no. 2, pp. 143-148, 1976

Authors: Fukada, Eiichi

Article Type: Other

DOI: 10.3233/BIR-1976-13210

Citation: Biorheology, vol. 13, no. 2, pp. 149-150, 1976