combustion engines are gasoline (or petrol), diesel, and kerosene. Many people claimed the invention of the internal combustion engine in the 1860's, but only one has the patent on the four stroke operating sequence. In 1867, Nikolaus August Otto, a German engineer, developed the four-stroke Otto cycle, which is widely used in transportation even today. Otto developed the four-stroke internal combustion engine when he was 34 years old.
Arc system. The Arc system stands for Anoxic Respiratory Control system. It is an example of a two-component system, in that it has a sensor molecule and a response regulator. The Regulation of Various Genes
An electric arc is a device in which an electric current (a flow of electrons) is caused to flow between two points separated by a gas. The two points are called electrodes. The one from which the current originates is the cathode. The electrode toward which electrons flow is the anode.