| abstract |
A biological cell preservation or culturing arrangement ( 20 ) comprises a chamber defining a fluid retaining space ( 30 ) for retaining in use a body of fluid ( 34 ) and a deformable membrane ( 36 ) in communication with the fluid retaining space, and being manipulable by an electroactive polymer actuator arrangement ( 38 ) to undergo a defined topology change to induce in the fluid a pattern of fluid flow by which fluid is exchanged between a sub-region ( 46 ) immediately proximal the deformable membrane and a sub-region ( 48 ) removed from the deformable membrane. |