She was among those who discussed a hypothetical planet perturbing Uranus. Now, introduce a time-dependent perturbing Hamiltonian . Analysis has shown that solar-radiation pressure is perturbing its motion perceptibly. The tendency of a perturbing signal to grow makes modulation instability a form of amplification. Other tools for perturbing their genetic makeup are chicken embryonic stem cells and viral vectors. Here he introduced his analysis of perturbing accelerations on the Moon in the Sun-Earth-Moon system. Each of these attempted to include intrinsic correction(s) for one or more perturbing factors. Next, the system is encouraged to remain on that orbit by perturbing the appropriate parameter. Initial condition uncertainty is represented by perturbing the starting conditions between the different ensemble members. Later analytic methods often included thousands of perturbing corrections for each particular object. Ongoing research in interoception has shown the importance of perturbing interoceptive systems. These are called "perturbing forces". Perturbing forces cause orbits to become perturbed from a perfect Keplerian orbit.