This invention describes genes, metabolic pathways, microbial strains and methods to produce methyl butanol and other compounds of interest from renewable feedstocks. A processing unit processes the sensed signals and controls the stimulation delivery via the first electrode and the second electrode, determining whether a predetermined rhythm is detected in the first chamber, and delivering high-frequency burst pacing to the first chamber in response to a predetermined rate being sensed in the second chamber during the predetermined rhythm. The trigger assembly and the latchrelease assembly\u2014can be attached on either side of the bar such that the bow is configured for left or right hand shooting. A first region of a first carrier concentration is formed in the semiconductor layer. The device comprises a support for holding a plate made of the thermal protection material for testing so that its faces a face of a block of solid propellant, the space between the plate and the face of the propellant block defining a combustion chamber of substantially rectangular shape, said chamber extending along said plate and opening out into a nozzle. The combustor also offers the possibility of avoiding the use of selected catalytic reaction units for removal of oxides of nitrogen from combustion gases exiting a gas turbine.