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.
The print image must be inscribed on the drum first in order to transfer it to paper, and the drum's coating makes it receptive to light. Most laser printer drums are coated with selenium. Selenium is a nonmetallic element with photovoltaic and photo-conductive properties that make it ideal for this use.