By Giorgio Federici ... [et al.].
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Lid-locking devices are fitted to most modern machines to prevent the lid being opened when the rotor is spi nning, but some older low-speed machines do not have this device and the lid can be opened before the rotor stops. Never do this, and never try to increase the braking of the roto r by applying manual pressure. This is exceedingly dangerous and, also, the sudden change in deceleration rate will create a vortex in the centrifugation medium, upsetting th e pellet or bands of material present.
The core (F) and wall (H+G) ports on tile vane assembly (F) terminate in a cenrral channel (C) ami an anrlll/us (D) respectively, wllicll continue upw(mi5 through the lower rowling part of file fluid seal (b). The IIpper (static) part of tile fluid seal (a) cOlllains tile same central channel and annulus. m. in the open cetUrifuge clramber, a fray fitted imo the lOp of the "wmber mechanically restrains the sllltic parI (a) from rotating and also applies pressure at the polis/led apposed faces of the two pans of tJU!
12). In ultracentrifuges this requires a more complex fluid seal to be in place during the entire operation within the evacuated centrifuge chamber. It is less of a problem for high-speed centrifuges. In ultracentrifuges, continuous-flow zonal rotors are used principally for the harvesting of virus from very large volumes (10-20 I) of culture fluid, while those for high-speed rotors can be used for similar volumes of bacterial cultures. For more information on their mode of use and specific proto· cols, see Craham (1992).