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.
Fish and other aerobic aquatic organisms require oxygen to live and reproduce. For those that cannot obtain oxygen directly from the atmosphere, the amount dissolved in the water is critical. On the molecular scale, DO molecules can be illustrated as fitting in the spaces between adjacent water molecules (Figure 1).