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Devices designed to operate as the rotary component of a centrifuge. Rotors typically consist of solid, usually metal (e.g., titanium), devices containing two, four, or more wells within which containers (typically centrifuge tubes) may be placed. A variety of centrifuge rotors are available according to the size and type of centrifuge in which they are used. The most common types of centrifuge rotors are (1) swinging bucket rotors, in which the sample tubes are located in individual buckets that hang vertically while the rotor is at rest; the buckets swing out to a horizontal position during rotation and are used mainly to separate samples according to their density gradient; (2) fixed-angle rotors, in which the sample tubes are fixed at the angle of the rotor cavity, used mainly to separate samples according to their size (e.g., bacteria, yeast, cells) and/or density (e.g., DNA, RNA); and (3) vertical rotors, in which on the sample tubes are fixed in a vertical position during rotation, used mainly for DNA, RNA, and lipoprotein isolation. Most centrifuge rotors are intended for use with a specific model and type of centrifuge.
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