A power factor correcting boost converter is to convert an input to an intermediate DC signal. After an engine cold start, the engine is operated to raise exhaust manifold temperature to a first predetermined value by operating the engine with a lean air-fuel ratio and retarded ignition timing. The compounds described herein are thought to act by inhibiting retroviral maturation, including maturation of encapsulated retroviruses viruses, such as the HIV viruses, HIV-1 and HIV-2. The memory cell of the first plurality of memory cells is configured to receive data on the first local data line.