Sumanas is a provider of animations of science and statistics concepts. Their public gallery of animations is divided into ten categories dealing with various topics in biology, chemistry, Earth science, and statistics. Many of the animations are narrated, but even those that aren’t are very clear none-the-less. The largest selections of animations are found in the biology categories. Pictured below is a screen capture from the animation of heat changing a protein.

Applications for Education
The animations provided by Sumanas in their public gallery could be good supplements to your course notes. Some of the animations include quizzes at the end that students can use to self-assess their understanding of a concept.

Here are some related items that may be of interest to you:
10 Sources of Educational Science Games
A Large Collection of Cell Biology Videos
The Interactive Periodic Table