A heater assembly includes a housing structure, a support structure, an insulator structure, and a heating structure. One embodiment of the present invention comprises a single chamber configurable to deposit different materials on a substrate spooled between two reels. In addition, a plurality of coupling features are utilized to facilitate attachment of the hinge cover with the mobile computing device. Deacetylation of AceCS2 by SIRT3 activates the acetyl-CoA synthetase activity of AceCS2.