Membrane potential function as a battery, providing power to operate a variety of "molecular devices" embedded in the membrane. Second, in electrically excitable cells such as neurons and muscle cells, it is used for transmitting signals between different parts of a cell. Signals are generated by opening or closing of ion channels at one point in the membrane, producing a local change in the membrane potential. This change in the electric field can be quickly affected by either adjacent or more distant ion channels in the membrane. Those ion channels can then open or close as a result of the potential change,
Common Source Data Base Common Source Data Base Technical documentation is used in many areas of the everyday life. Nearly everything has to be provided with at minimum a drawing including a few locators. The product liability and many other issues regarding consumer protection have to be covered inside technical documentation. A special form of technical documentation is electronic technical documentation, a further subform is interactive electronic technical documentation (IETD). The complexity of IETD especially regarding the huge mass of data elements, their linkage and the version management issuing and release process must be controlled via a special document management system. To handle these