The fundamental frequency is the reciprocal of the period of the periodic phenomenon. The constant also appears naturally in Fourier series of periodic functions. There are no specific recommendations for periodic ophthalmological monitoring. This often involves payment of a periodic renewal fee. They returned to their peacetime routine of training and maneuvers and periodic maintenance. Effectiveness is monitored through periodic blood tests. Trigonometric functions also prove to be useful in the study of general periodic functions. Silver forms alloys with most other elements on the periodic table. She then entered drydock for periodic maintenance. This behavior is responsible for the structure of the periodic table. Nitrate formation with elements of the periodic table. Ionization energy becomes greater up and to the right of the periodic table. These include waivers of oil sanctions implemented in January 2012, which require periodic re-certification. The trajectory may be periodic or chaotic. It is a rare transition metal belonging to the platinum group of the periodic table.