Dr. Grace Dzido, MD is an internal medicine doctor who practices in Roanoke, VA. She is 54 years old and has been practicing for 19 years.
The Loading Dye * Loading dye is a colored buffer mixed with the DNA prior to loading onto the gel. The loading dye contains a relatively high concentration of either glycerol or sucrose. This makes the solution more dense than the surrounding running buffer so that when a sample is pipetted over top of a well it sinks down into the well.
Answer 2 : Yes. 1  If you would like to secure the adhesion of the powdery pastel pigments to the medium in spite of the future alterations that fixing may cause to the surface. 2  If you are willing to accept the changes in the pure pastel colors and textures caused by the fixative process itself.