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.
Inactivation of prions by physical and chemical means. Taylor DM(1). Author information: (1)Neuropathogenesis Unit, Institute for Animal Health, Edinburgh, UK. Prions are very resistant to inactivation, and accidental transmission has occurred through the use of inadequate decontamination procedures.Strong sodium hypochiorite solutions achieve inactivation but other chlorine-releasing compounds are less effective.2M sodium hydroxide leads to substantial but incomplete inactivation; other chemical procedures such as the use of proprietary phenolic disinfectants are much less less effective.trong sodium hypochiorite solutions achieve inactivation but other chlorine-releasing compounds are less effective. 2M sodium hydroxide leads to substantial but incomplete inactivation; other chemical procedures such as the use of proprietary phenolic disinfectants are much less less effective.