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.
Autoregulation is a process within many biological systems, resulting from an internal adaptive mechanism that works to adjust (or mitigate) that system's response to stimuli.While most systems of the body show some degree of autoregulation, it is most clearly observed in the kidney, the heart, and the brain.his is so-called steady-state system. An example is a system in which a protein P that is a product of gene G positively regulates its own production by binding to a regulatory element of the gene coding for it, and the protein gets used or lost at a rate that increases as its concentration increases.