Fissure filling is a treatment that improves the apparent clarity of a gemstone by removing air and replacing it with a substance that has a refractive index similar to the host material. Many different substances may be used to fill fissures: oils, resins, waxes, glass, and various polymers, to name a few.
Cerebral autoregulation is a process in mammals, which aims to maintain adequate and stable cerebral blood flow.hile most systems of the body show some degree of autoregulation, the brain is very sensitive to over-and underperfusion. Cerebral autoregulation plays an important role in maintaining an appropriate blood flow to that region.
but it also may be due to autoregulatory dysfunction with. 1  Excessive cerebral blood flow (e.g.: â reperfusion injury) â. 2  Hemorrhagic transformation 3  â. Cold exposure 4  â. Rupture of an aneurysm or arteriovenous malformation (AVM) â. 5  Arteriopathy (e.g. cerebral amyloid angiopathy, moyamoya) â.