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The viscosity of blood at high rates of shear is unusually low compared to other suspensions of similar concentration. The underlying mechanisms were studied by rotational viscometry, red cell filtration, viscometry of packed cells and direct microscopic observation of red cells under flow in a transparent cone plate viscometer. Deformability of red cells(More)
• Blood has been recognized as a non-Newtonian fluid for many years. Only recently' have the rheological properties of blood been studied under shear rates near zero flow. These studies have suggested that the viscosity of blood increases indefinitely as the shear rate approaches zero. The problem of blood rheology under very low shear rates seemed to us(More)
Der Anstieg der Viscosität des Blutes im Bereich sehr niedriger Schergrade beruht auf dem Aufbau einer dreidimensionalen Zellstruktur, die sich aus Erythrocyten-Rouleaux zusammensetzt. Nach osmotischer Stechapfelbildung wird die Rouleaux-Bildung und die sekundäre Ausbildung größerer Erythrocytenaggregate gestört. Als Folge dessen wird bei Suspensionen von(More)
A significant increase in the plasma concentration of norepinephrine on tilting 19 normal st:bjects from the horizontal to 600 upright is described. Evidence that this represents an increased neuj-oadrenergic activity to maintain cerebral circulation despite the periph-e-pooling of blood has previously been reported. When 9 subjects with severe essen-LI il(More)