Angle of incidence measurements along an axis of ion implantation are obtained by employing positive and negative slot structures. In another aspect, the invention is directed to a method of maintaining or augmenting fat volume at one or more sites in an individual in need thereof comprising introducing an effective amount one or more epineural sheaths comprising adipose tissue to the one or more sites in the individual. The monitoring circuit also includes a driver configured to transmit a sensor signal to the reference resistor and the load, a primary converter coupled to the reference resistor and the load and configured to detect a primary converted signal as a function of the sensor signal passing through the reference resistor and the load. The invention also relates to certain novel compounds of formula. A first die is mounted on the first surface of the interposer. The mollusc repellent is environmentally friendly, being both non-phytotoxic and harmless to non-target animals, and is therefore suitable for use in sustainable agriculture, where the use of toxic chemicals is unacceptable.