Abstract: The invention relates to a method for obtaining recombinant HbsAg. According to said method, recombinant methylotrophic yeast cells that are capable of expressing HbsAg are broken down using a high-pressure homogenizer and the HBsAg is extracted from the resulting cell debris. The inventive method is characterised by a high product yield per g cell dry weight and is therefore a considerable improvement on known methods for obtaining HBsAg from micro-organisms.

Abstract: Proposed is a device for moving a robot or vehicle on surfaces, particula of a glass construction, which has a support frame provided with wheels, which forms a component part of the robot or vehicle, at least one wheel being in the form of a raisable drive wheel. The drive wheel is made of a material with a high coefficient of friction in the direction of travel, while the other wheels are made of a material with a low coefficient of friction. Furthermore, at least two rope drums, spaced apart, accommodating retaining ropes, and with a drum drive, are provided to hold the support frame. Attached on the support frame are a device for determining the lateral deviation and rotation of the support frame with respect to the linear forward movement and an device for correcting the rotation. A control device controls or regulates the correction device, in dependence on the magnitude of the lateral deviation and rotation. The invention further relates to a robot with the drive device.