Abstract: A blast nozzle formed of a non-conductive material includes electrically conductive paths embedded therein to keep the build up of static electricity below an undesirable level. Stainless steel rods extend the length of the blast nozzle, providing a continuous electrical path.

Abstract: A blast nozzle formed of a non-conductive material includes electrically conductive paths embedded therein to keep the build up of static electricity below an undesirable level. Stainless steel rods extend the length of the blast nozzle, providing a continuous electrical path.

Abstract: Isolated peptides and polypeptides exhibiting the antigenicity of the 70 kD mitochondrial autoantigen of primary biliary cirrhosis are provided. The peptides, polypeptides and antigenic fragments thereof are useful in the diagnosis and treatment of primary biliary cirrhosis.

Abstract: An ultralight helicopter has a pair of counter-rotating rotor assemblies which in combination yield zero net angular momentum when rotating at equal speeds. A single motor drives both rotors through a counter-rotating bevel gear set coupled to a pair of concentrically nested output shafts. In an alternative embodiment, the motor is coupled to the rotors through a hydraulic drive system which includes a hydraulic pump and at least one hydraulic motor driving each of the rotor assemblies. The pilot is advantageously suspended in a "hang-glider" type harness from a single hang point positioned proximate the center of lift of the helicopter. A control bar is fixedly mounted to the frame and is grasped by the pilot suspended in the harness. The pilot maneuvers the helicopter in both the pitch and roll directions by manipulating the control bar. The pilot shifts his own center of gravity relative to the center of gravity of the helicopter while grasping the control bar to thereby maneuver the helicopter.