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Fig. 6. A series of pictures of four (labelled 14 in frame 0) membrane
vesicles derived from the contractile vacuole complex of a P.
multimicronucleatum cell, showing shrinkage and subsequent fusion when
exposed to an increased external osmolarity produced by adding 0.5 mol
l1 sorbitol solution. Numbers on frames correspond to the
time (s) when the picture was taken after the start of the increase in
external osmolarity. p, a micropipette for application of the sorbitol
solution. Scale bar, 10 µm.