Eppendorf Ag

Eppendorf-netheler-hinz Gmbh

Bernd Jagdhuber

Peter Molitor

Herbert Belgardt

Wolfgang Kroger

Hans-Joachim Ricklefs

Pipette having an axially relocatable control button, a pressure sensor, which is integrated into the control button, a lifting rod, coupled with the control button and having a stopping bead, a hollow driving spindle, accommodating the lifting rod and being axially relocatable, a twisting lock, preventing the driving spindle from being twisted, a turnable driving nut having screw thread engagement with the driving spindle, an axial support of the driving nut, an electric driving motor with a motor shaft, a gear between the motor shaft and the driving nut, an electric power supply, an electric control system, connected to the pressure sensor, the electric driving motor and the electric power supply, which provides an electric voltage to the electric driving motor upon a push on the control button which is indicated by the pressure sensor, so that the motor relocates the driving spindle via the gear in the direction of a relocation of the control button by the push, the driving spindle taking the lifting rod along with it on its stopping bead, a plunger, coaxially displaceable with respect to the lifting rod, a cylinder, connected to an opening which leads outward and in which the plunger is sealingly guided, and a plunger spring loading the plunger in the direction of an end of the lifting rod.

Pipette

A proportioning device, comprising a manually operable actuating device, a sensor associated with the actuating device for detecting a force manually exerted on the actuating device, an electric driving motor, an electric control connected to the sensor and electric driving motor for controlling the driving motor during the detection by the sensor of a force exerted on the actuating device, an electric voltage supply connected to the sensor, electric driving motor, and electronic control, and a displacement device coupled to the actuating device and electric driving motor for proportioning a liquid.

Proportioning device

A method for the electropermeation of living cells between at least two electrodes over a predetermined interval with an electrical potential or a current, characterised by the following features:

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Uetersen, Germany

Bernd Jagdhuber