Abstract: A rotor and specimen holder assembly for producing a relatively low power, low audible level, cool running centrifuge. The centrifuge rotor assembly is designed to enable a specimen holder to retract into the body of the rotor during centrifugation to produce aerodynamic features.

Abstract: A horizontal centrifuge rotor for use in existing and new centrifuges. The horizontal centrifuge rotor includes a rotor bottom with an outer rib encircling the rotor bottom. The outer rib extends upward from the rotor bottom to form an exterior wall about the rotor. There is at least one clearance slot for accepting a specimen holder with a collar. A support surface along each side of the clearance slot supports the specimen holder by the collar and allows rotation of the specimen holder about the collar from a vertical position to a horizontal position. There is a rotor hub in a center of the rotor bottom to allow mounting of the rotor to a motor drive shaft.

Abstract: A horizontal centrifuge rotor for use in existing and new centrifuges. The horizontal centrifuge rotor includes a rotor bottom with an outer rib encircling the rotor bottom. The outer rib extends upward from the rotor bottom to form an exterior wall about the rotor. There is at least one clearance slot to accept a specimen holder with a collar. A support surface is along each side of each of the at least one clearance slots to support the specimen holder by the collar and to allow rotation of the specimen holder about the collar from a vertical position to a horizontal position. There is a rotor hub in a center of the rotor bottom to allow mounting of the rotor to a motor drive shaft.