Abstract: A method of in-situ groundwater nitrification, by: extracting groundwater from the ground; adding oxygen to the extracted groundwater; adding nutrients to the extracted groundwater; and injecting the groundwater back into the ground, wherein the oxygen reacts with in-situ nitrifying bacteria to oxidize ammonia to nitrate, and wherein the nutrients encourage the nitrifying bacteria to grow and reproduce. A method of in-situ groundwater de-nitrification, by: extracting the groundwater from the ground; adding carbon to the extracted groundwater; adding nutrients to the extracted groundwater; and injecting the groundwater back into the ground, wherein the carbon reacts with in-situ de-nitrifying bacteria to reduce nitrate to nitrogen gas, and wherein the nutrients encourage the de-nitrifying bacteria to grow and reproduce.

Abstract: Method and arrangement for the wireless control of a device, in particular in the field of medicine. The present invention is directed to a solution for the operation of devices to be controlled, wherein signals required for controlling and monitoring are transmitted wirelessly. In the arrangement for the wireless control of a device, the control is carried out by a separate operating unit. The operating unit and the device to be controlled each have their own transmitting unit and receiving units. Signals are sent from the transmitting unit of the device to be controlled at a high repeat rate. The operating unit is activated by means of these signals and generates its power supply therefrom. Coded signals are generated by the operating unit for the different operating commands and sent to the device to be controlled. The solution that was developed for medical instruments can also be applied to many other technical fields.