Which centrifuge has tubes fixed at 25-40 degrees during rotation for rapid centrifugation?

Which centrifuge has tubes fixed at 25-40 degrees during rotation for rapid centrifugation?

• A. Cytocentrifuge
• B. Fixed/Angle-head centrifuge
• C. Ultra centrifuge
• D. Horizontal head centrifuge/swinging bucket

Answer: (B)

A fixed-angle centrifuge keeps tubes at a constant tilt relative to the axis of rotation, typically about 25–40 degrees. That fixed angle makes the sediment move toward the bottom along the side of the tube, so particles are driven down more quickly and compactly. The angled orientation also reduces turbulence that can resuspend material, allowing higher speeds to produce rapid separation. Because of this direct, steady orientation during spin, it’s the setup described in the question. In contrast, swinging-bucket centrifuges rotate tubes to a horizontal position during spin, which changes how quickly and where pellets form; ultracentrifuges emphasize extremely high speeds rather than tube angle; cytocentrifuges are specialized for preparing samples on slides but still rely on how the tube is oriented during spin.

A fixed-angle centrifuge keeps tubes at a constant tilt relative to the axis of rotation, typically about 25–40 degrees. That fixed angle makes the sediment move toward the bottom along the side of the tube, so particles are driven down more quickly and compactly. The angled orientation also reduces turbulence that can resuspend material, allowing higher speeds to produce rapid separation. Because of this direct, steady orientation during spin, it’s the setup described in the question. In contrast, swinging-bucket centrifuges rotate tubes to a horizontal position during spin, which changes how quickly and where pellets form; ultracentrifuges emphasize extremely high speeds rather than tube angle; cytocentrifuges are specialized for preparing samples on slides but still rely on how the tube is oriented during spin.