The present invention includes methods, devices and systems for isolating a nucleic acid from a fluid comprising cells. A plurality of modules executing on the virtual machine images is selected by a user to comprise a plurality of configurations. In the presence of an interference amplitude, a stochastic shift of the chronologically equidistant sampling points in time, which are determined by the sampling frequency f, is carried out within a range \u2212\u0394t; +\u0394t around the equidistant sampling points in time, \u0394t being the maximum shift. Virtual representations of one or more resources available to a virtual world client are fetched. The interpolator circuit receives the output clock, and generates the feedback clock by introducing a variable time delay in the output clock in accordance with the interpolator control word.