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.
Pressure autoregulation maintains CBF at a constant level in normal brain in the face of the usual fluctuations in blood pressure. It is a poorly understood local vascular mechanism. Normally autoregulation maintains a constant blood flow between MAP 50 mmHg and 150 mmHg.ressure autoregulation maintains CBF at a constant level in normal brain in the face of the usual fluctuations in blood pressure. It is a poorly understood local vascular mechanism. Normally autoregulation maintains a constant blood flow between MAP 50 mmHg and 150 mmHg.