Abstract: A method for safely, reliably and continuously feeding a liquid specimen such as human blood in one container on a centrifugal rotor into another container on the same rotor without the need to touch the specimen as well as any part of the device while completely preventing contamination due to mixing of microorganisms. A liquid is injected into a pressurizing or a depressurizing container on a rotor from outside to pressurize or depressurize a first container on the rotor, thereby feeding under pressure a specimen in the first container into a second container on the same rotor, or sucking a specimen in the second container into the first container.

Abstract: A method and an apparatus for centrifugal separation of components of a solution in which a centrifugal rotor is employed so that different components are successively separated. The centrifugal rotor comprises a hollow body including at least one annular peripheral groove formed in the inside thereof and a series of depressions formed in the inside wall thereof, in which the annular groove and the depression at one end of the series are communicated with each other while the depressions at one end and the other end of the series are not communicated with each other and the adjacent depressions are communicated together through a communicating groove, whereby the solution injected into the annular groove is successively displaced and distributed through the respective depressions under the centrifugal effect while it is subjected to the centrifugal separation.