A centrifuge tube assembly which allows for a single centrifuge cycle and which permits the aspiration of fluids from multiple levels with the centrifuge tube assembly. The centrifuge tube assembly includes a vertically disposed outer containment tube having a closed lower end and an open upper end with the open upper end being closed by a cap. An elongated inner tube extends downwardly through the cap and into the interior of the outer containment tube. A generally cone-shaped disk assembly is slidably mounted on the inner tube to create a chamber above the disk assembly. An O-ring is mounted on the lower end of the disk assembly which is in yieldable engagement with the inner tube. A flapper valve is positioned in the upper end of the disk assembly. The flapper valve has a plurality of slits formed therein.

A centrifuge layering insert configured for insertion into a centrifuge tube includes a tube having a first open end and a second open end. The centrifuge layering insert also includes a casing having an outer wall, an inner wall, a first open end, and a second substantially closed end. The casing forms an annular space around the tube between the tube first end and the tube second end. The tube has at least a portion of the length extending beyond the first open end of the casing in a direction opposite the second open end of the tube.

Provided is an impedance measuring device for biological samples including one or a plurality of biological sample holding units configured to hold a biological sample, an applying unit configured to apply an AC voltage to a pair of electrodes in contact with the biological sample held by the biological sample holding unit, a measuring unit configured to measure an impedance of the biological sample obtained by an AC voltage being applied to the biological sample by the applying unit, and a measurement condition control unit configured to control a measuring time and/or a measuring frequency in the measuring unit.

A centrifuge tube assembly which allows for a single centrifuge cycle and which permits the aspiration of fluids from multiple levels with the centrifuge tube assembly. A modified centrifuge assembly is described wherein the inner tube has an externally threaded portion at its upper end. The method of using the centrifuge tube assembly is also described wherein the centrifuge tube assembly may be used for the aspiration, separation, isolation and extracting of discrete layer in a liquid suspension.

A fluidic centripetal apparatus for testing components of a biological material in a fluid is presented. A bottom-fillable chamber is coupled to an entry channel for receiving the fluid, the chamber inlet being provided at an outer side of the bottom-fillable chamber. A container is wholly provided in a retention chamber and contains a liquid diluent, until it releases it upon application of an external force, restoring the fluidic connection between the liquid diluent and the fluid in the retention chamber. The retention chamber can have a flow decoupling receptacle for receiving the fluid, located at the outer side of the retention chamber and interrupting a fluidic connection between the entry and exit of the retention chamber. A test apparatus and a testing method using a fluidic centripetal device for testing components of a biological material in a fluid are also provided.

A measurement accuracy of a particle size distribution measuring device that performs a particle size distribution measurement in a line start mode is improved by a measurement cell used in a line start mode of a centrifugal sedimentation type particle size distribution measuring device that includes a cell main body and a cell cap. The cell main body has an opening provided on one end and stores therein a density gradient liquid WDGS. The cell cap closes the opening of the cell main body and has an internal passage R provided therein for holding a sample liquid WSS. When an application of a centrifugal force is received, the sample liquid WSS is introduced from the internal passage R into the density gradient liquid WDGS.

A measurement accuracy of a particle size distribution measuring device that performs a particle size distribution measurement in a line start mode is improved by a measurement cell used in a line start mode of a centrifugal sedimentation type particle size distribution measuring device that includes a cell main body and a cell cap. The cell main body has an opening provided on one end and stores therein a density gradient liquid WDGS. The cell cap closes the opening of the cell main body and has an internal passage R provided therein for holding a sample liquid WSS. When an application of a centrifugal force is received, the sample liquid WSS is introduced from the internal passage R into the density gradient liquid WDGS.

A system performs a non-destructive measurement of a density gradient to automatically replicate and dispense the density gradient. The system obtains measurements at points along a length of the density gradient and generates a profile of the density gradient based on the measurements. The system uses the profile to replicate the density gradient of components in a second container. The system inserts a distal end of a probe into the second container, and pumps separate components into a manifold and mixing chamber connected to a proximal end of the probe to automatically dispense the density gradient in the second container.

A system performs a non-destructive measurement of a density gradient to automatically replicate and dispense the density gradient. The system obtains measurements at points along a length of the density gradient and generates a profile of the density gradient based on the measurements. The system uses the profile to replicate the density gradient of components in a second container. The system inserts a distal end of a probe into the second container, and pumps separate components into a manifold and mixing chamber connected to a proximal end of the probe to automatically dispense the density gradient in the second container.