I am doing some SDS PAGE. Now, i am baffled by the fact that my gel bubbles at the bottom and there is a bell shape in the sample under separation, towards the bottom of the gel ( as shown by the pictures below:
Gel bubbles might be formed by the unclean plate or the interspace between the plate and the mould. You can wash your plate carefully. Before making the SDS-PAGE, you can infiltrate the bottom of the plate.