Abstract: A propulsion assembly including a propulsion system, electric motors and a transmission system that is configured to couple the electric motors to the propulsion system, at least one of the electric motors including an output shaft located at a face facing away from the transmission system. Additionally, the propulsion assembly includes at least one coupling shaft connecting the output shaft of the electric motor to the transmission system, a first coupling system, which is able to switch over to the uncoupled state in the event of an incident at the electric motor and is configured to rotationally couple the first end of the coupling shaft to the output shaft of the electric motor, and a second coupling system, which is configured to rotationally couple the second end of the coupling shaft to the transmission system.

Abstract: Molecular conjugates which facilitate the attachment of macromolecular drugs onto cellular surfaces and their entry into cells are described. The molecular conjugates comprise a macromolecular drug linked to an "inactivated" membrane blending agent which inserts into the cellular plasma membrane. The membrane blending agent is inactivated by cleavable linkage to a blocking agent which, until released from the conjugate under appropriate conditions, blocks and ability of the membrane blending agent to insert into the cellular membrane. Upon release of the blocking agent, the membrane blending agent is "activated" and the conjugate can be inserted into a cellular plasma membrane. The membrane blending agents can be peptides such as fusogenic or ion channel forming peptides or long chain fatty acids. The blocking agents can be bulky or charged moieties which mask and prevent insertion of the membrane blending agent.