Methods for cell lysis and purification of biological materials, involving subjecting a sample to high pressure. A broadcast frame is spread using a second PN spreader. The blade assembly not only cuts the cornstalk from its root but also chops the stalk into stover. This communication permits flow of information and actions between the expert system and the clinical systems and allows maintenance of audit logs in both systems. Thus, the decision to turn off the drive control unit is made at the secondary side so that non-load conduction loss can be minimized. The back side of the bearing hub is positively sealed with a protected O-ring and dust cap combination.