originally I decided to delete my last foto-series of Micrasterias denticulata, because the alga didn't cooperate very much. It didn't show enough flatness and tried to run away during the photo-shooting.
But a few weks later I thougt, what about the velocity of that thing? Between the first and the last photo of that session the Micrasterieas moved 60 µm. Together with the time stamp from the corresponding jpegs results a velocity of ~ 0,5 µm/s. This is in good accordance with the data given here: http://www.biologie.uni-erlangen.de/bot ... b.6.3.html
The picture shows the overlay of the first and the last picture.
Remark: Some folks in the German forum mentioned, that µm/s must be the new dimension for the working-velocity of German executives.
However I do find the results of those who are very adept at such things to be interesting. The overlay gives an excellent impression of the span of movement. um/s, I like that. I know some Americans who work at the same speed where I am employed.