Manufacturers attribute the incidents to mechanical problems unrelated to the devices. Numerous safeguards are built-in, the manufacturers say. The devices won't shut down the engine while the vehicle is moving, and consumers can extend the car's operation in an emergency. Contracts spell out that the device is present on the vehicle.
an organism that lives and grows in the absence of molecular oxygen. facultative anaerobe. a microorganism that can grow with or without molecular oxygen. obligate anaerobe. an organism that can grow only in the complete absence of molecular oxygen.
obligate anaerobes - organisms that carry out ONLY fermentation or anaerobic respiration and can not survive in the presence of oxygen. facultative anaerobes - organisms that makes ATP by aerobic respiration if oxygen is present but that can switch to anaerobic respiration or fermentation if there is no oxygen.