THESE ARE A FEW ANIMATIONS FOR THE PRESENTATIONS IN SECOND LIFE

This is an in vivo image of an embryo at the stage called "primitive streak" The embryo is approximately flat, and has a key hole shape (oriented horizontally, the key hole shape is not that obvious...) The scale is approximately 2.5 millimeters full scale. The primitive streak is the furrow along which the cell makes a U-turn vertically (so called involution or epiboly).
This is an in vivo movie of the first 40 minutes of descent of "Hensen's node", and below, the cell tracking at this time. It shows the onset of the dipolar flow. In this picture cranial is to the left, caudal to the right. (For the sake of optimizing download speed, the file is reduced to 33% of the original size).
PIV tracking of the movement, please notice the vortex. This is magnified as compared to the previous film. The green tracks start on a blue cross, and correspond to the positions of the cross at 1minute interval.
This is an in vivo movie of the next 20 minutes of descent of "Hensen's node", and below, the cell tracking at this time. It shows the migration and establishment of the dipolar flow.
PIV tracking of the movement, please notice that the vortex has moved caudally. It is "advected" caudally by the shear of the median axis.
This is an in vivo movie of the next 20 minutes of descent of "Hensen's node", and below, the cell tracking at this time. It shows a well established vortex.
PIV tracking of the movement, please notice that the vortex has moved even more caudally. But notice that the vortex is elongated and has an oblate, "rugby ball" shape.
Animations continue. See more images and animations Go to mathematical formulas Mathematics of vortex flows

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La citation de la page : "Gare à la flatterie, ma fille : trop de sucre gâte les dents"; Mme de Sévigné