Abstract
The orientation of normal erythrocytes in a uniform static magnetic field (8 T maximum) has been investigated microscopically and photometrically. 1. (1) The intact erythrocytes were oriented with their disk planes parallel to the magnetic field because of the diamagnetism of the cell membrane components, particularly the transmembrane proteins (e.g., Band III, glycopholin) and the lipid bilayer. 2. (2) In contrast, the glutaraldehyde-fixed erythrocytes were oriented perpendicular to the field, perhaps because of the paramagnetism of the membrane-bound methemoglobin. 3. (3) The orientation was established within 5 s in a dilute suspension (5 × 10 3cells μl −1) as estimated from the change in light scattering after exposure to the magnetic field.
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