赤血球の流動透光性 : 生物のレオロジー
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概要
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When one makes erythrocyte counts in blood, one may observe irregular darkbright stripes like a gossamer-"Schlieren-effect"-in a mixer. This peculiar phenomenon led us to make experiments to ascertain whether light transparency will change or not according to the state of the erythrocyte suspensions being resting or flowing when light is projected on them. We have found that the transmitted light is more intensive in the flowing state than in the resting state, and one of us (Kuroda) has called this phenomenon "streaming transparency." The apparatus for measuring the streaming transparency consists of a Beckman photoelectric spectrophotometer of direct reading type and a chamber with a rotating vessel attached to it, as shown in Fig.1. The rotating vessel is made of glass and is cylindracal, 8 cm in diameter and 1 cm in height, as shown in Fig.2. In the center of the vessel is a glass rod with a small propeller, which is connected with an electric motor with a belt. the erythrocyte suspension is placed in the rotating vessel, and the attenuance (optical density) of the suspension is read at rest and inflow. The term "degree of streaming transparency", which is introduced to express the streaming transparency quantitatively, is given by the difference between the attenuace of the resting erythrocyte suspension (A) and that of the flowing erythrocyte suspension (A'). Degree of streaming transparency=A-A'. The degree of the streaming transparency of the erythrocyte suspension approaches zero when this erythrocyte is completely spherical, while the degree of the streaming transparency becomes larger when the shape of the erythrocyte deviates from the sphere (Tab. 1). As shown in Fig.5, the degree of the streaming transparency is remarkably increased with the increasing concentration of erythrocytes. However, at higher concentrations of erythrocytes, the degree of the streaming transparency decreases and becomes negative. This phenomenon, which shows that the light intensity transmitted through the erythrocyte suspensions is smaller in flow than at rest, is termed the "negative streaming transparency.",
- 社団法人日本材料学会の論文
- 1964-05-15
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