The transmitted light intensity (
I) through a erythrocyte suspension in plasma was measured at various stirring rates. The suspension was subjected to the strong stirring of 1000 rpm for 60 sec to disperse homogeneously the erythrocytes. Immediately after the stirring rate was varied from 1000 rpm to 750, 500, 300, 100 and 0 rpm,
I was recorded every 10 msec. Below 500 rpm, the mean value of
I increased exponentially with time due to erythrocyte aggregation, and the change of
I became significant when decreasing the stirring rate. However, when the stirring was completely stopped, i.e., for 0 rpm, the value of
I increased monotonically with time, and the change of
I was smaller than that of 100 rpm. These results were numerically analyzed by the least square method with an empirical formula.
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