link to a video of sea urchin cleavage, web site of Rachel Fink of Mt. Holyoke College
neurulation in a chick embryo
(serial sections spliced together to simulate sequential development)
This was shown in class without the narration. Please watch the whole thing again with the sound.
time-lapse video of Liesegang reaction
Heavy bands of precipitated silver bichromate forming over about one hour
several additional clips of Liesegang bands forming
A piece of thread was soaked in silver nitrate and laid across the gelatin containing the bichromate
4-fold rotational symmetry
(this is the one shown in class)
more about how these programs work
The four simulations above are video recordings of runs of a Java program, created by
a former student, that used to be accessible on this web site. Unfortunately the
program no longer works because of security issues with recent computers.
We would be most grateful for someone who could help us get around this problem.
back to syllabus