Abstract: This invention relates to semiconductor devices and to printed circuit boards (PCB) or circuit assemblies used to electrically connect components. Delay devices are associated with the conductive traces or with integrated circuits. Delay is used to offset then realign the wave edges of propagating signals so as to minimize electric field effects on nearby signals. Impedance controlling devices are used to minimize reflections. The effects of split planes may be minimized or negated.

Abstract: An apparatus and method are disclosed to wash blood cells in a discrete manner that is compatible with automated sample preparation systems. The test tube containing the cells to be washed is mounted on a rotatable spindle. The spindle includes central passageways for the introduction of wash fluid and air into the test tube, and radial exit passageways at the bottom of the spindle. The test tube is first spun about its vertical axis to centrifuge cells against the inner wall of the test tube. A vacuum is then applied to the exit passageways so cell supernatant is aspirated out through the exit passageways. Wash fluid is then introduced into the test tube, and aspirated out through the exit passageways, thereby washing the cells. Rotational acceleration and deceleration of the test tube then resuspends the cells in wash fluid.