MRI of a knee. MRIs employ powerful magnets which produce a strong magnetic field that forces protons in the body to align with that field. When a radiofrequency current is then pulsed through the patient, the protons are stimulated, and spin out of equilibrium, straining against the pull of the magnetic field.
Noun. 1. aestivation - (zoology) cessation or slowing of activity during the summer; especially slowing of metabolism in some animals during a hot or dry period. estivation. zoological science, zoology-the branch of biology that studies animals.
Examples. 1  This is a state called estivation; its like hibernation, but its triggered by dry and hot conditions instead of cold. 2  In my estivation, I conclude that Mother Nature is pissed about getting deep drilled and this heat is just a reminder of who is in charge.