Abstract: A prosthetic knee can include a variable-torque magnetorheological (MR) actuator assembly or braking system, a frame and an electronics assembly or system that also serves as a mount for the knee actuator and facilitates in monitoring and controlling the operation of the knee actuator. The prosthetic knee system advantageously provides resistive forces to substantially simulate the position and motion of a natural knee joint during ambulation and/or other locomotory activities performed by the amputee. The prosthetic knee can be enclosed in a waterproof compartment. An outer cover can be configured to fit around the waterproof cover of the prosthetic knee.

Abstract: A cell scraper device includes a pair of elongated handles, a blade and a pair of spaced apart pivotal joints. The handles enable a user to hold and to operate the device. Each handle has a pair of opposite ends and a longitudinal axis extending between the opposite ends. The handles are spaced apart from and disposed along one another and movable in opposite directions along their longitudinal axes. Each joint, such as a pivotal ball type or a living hinge type, pivotally joins the blade to one of a pair of adjacent ends of the handles such that the blade is pivotally movable between a closed position and an open position upon corresponding movement of the handles in the opposite directions along their longitudinal axes. The blade in the closed position is disposed at an acute angle relative to the longitudinal axis of each handle and on a side of the handle such that the blade and handles are positioned for insertion into and removal from a culture flask.

Abstract: A micro tube cap opening device includes a tubular holder, a lifting bar and a mounting sleeve. The holder has a well supported by a sidewall of the holder and open at a first end thereof for receiving therein a tube body of a micro tube. The mounting sleeve is attached on and along the sidewall of the holder. The lifting bar is slidably mounted by and through the mounting sleeve to undergo movement between a retracted position and an extended position. A first end of the lifting bar in the retracted position is disposed adjacent to the first end of the holder and adjacent to a cap of the micro tube in a closed position interference fitted into the tube body of the micro tube when the tube body of the micro tube is disposed within the well of the holder.

Abstract: A deep well rack assembly for pipette tips and the like includes an enclosure having a plurality of openings in a top wall thereof, a plurality of wells in the enclosure extending below the top wall and openings for receiving and retaining pipette tips, and a cover for overlying the top wall of the enclosure and the wells and pipette tips. The top wall of the enclosure either has a plurality of annular depressions formed therein and surrounding the openings or a plurality of raised annular rings formed thereon and surrounding the openings. The wells are disposed within an interior cavity of the enclosure. Each well has a continuous side wall attached at an open top end to the top wall and surrounding one of the openings therein. Each well is adapated to receive a pipette tip such that the pipette tip is disposable within the well and the respective annular depression or raised annular ring of the top wall of the enclosure.

Abstract: An improved cap structure for a centrifuge tube including a flat roughened texture surface on the top thereof especially adapted to permit writing thereon with a variety of standard writing instruments.