Figure 4.

Resuspension in small volumes requires a compact pellet if the rotor has a tapered interior (A) as the resuspension buffer will wet the area only near the equator. If a pellet has not fully compacted into the equator of the rotor, it will not be fully covered by resuspension buffer. In a rotor with flat side walls (B), the resuspension buffer will be spread over the entire interior surface, covering the entire surface area of the pellet.