Mitochondrial disease is a group of disorders caused by dysfunctional mitochondria, the organelles that generate energy for the cell.itochondrial diseases are sometimes (about 15% of the time) caused by mutations in the mitochondrial DNA that affect mitochondrial function.
1 Surface-mounted light â the finished housing is exposed, not flush with surface. 2  Chandelier. 3  Pendant light â suspended from the ceiling with a chain or pipe.  Sconce â provide up or down lights; can be used to illuminate artwork, architectural details; commonly used in hallways or as an alternative to overhead lighting.
(PHOTOS) When it comes to picking out lighting fixtures for your home, consider the pendant light, which hangs on a cord or a chain from the ceiling. The pendant has become a popular choice among homeowners since it's not as bulky and expensive as chandeliers and it makes for great task lighting in workspaces like the kitchen.