The invention provides new methods for separating nitrogen from a mixture. Also provided is a method for preventing andor treating interstitial cystitis by administering an effective amount of a vitamin D compound. The first input means is coupled to the indexing means, and the second input means is coupled to the motor. The processor receives vehicle location signals from the GPS receiver, files from the memory and signals from the radio and providing signals for transmission to the radio. In response to receiving a propagated update to a replica at a node, the replica for the file at the node is updated. The method includes adjusting timing of a signal to switch between the valve conditions based on an oil degradation condition from an oil sensor, wherein the combustion modes include spark ignition and homogenous charge compression ignition.