Abstract
Here, after a few general remarks about vacuum fluctuations and "spacetime foam" in quantum gravity, we shall set out the general features of the dipolar fluctuations (Section 1) and give some explicit order of magnitude calculations (Section 2). Then we shall show that a Lambda-term cuts, to some extent, the dipolar fluctuations (Section 3); this can lead in certain cases to an anomalous coupling to matter (Section 4). In conclusion, we shall discuss a number of new topics not addressed in Ref.s [3, 4].