in epidemiology a group of individuals who share a characteristic acquired at the same time. The term usually refers to a birth cohort, which contains animals born in a specified time period. cohort studies. a prospective or follow-up, analytical, epidemiological study.n epidemiology a group of individuals who share a characteristic acquired at the same time. The term usually refers to a birth cohort, which contains animals born in a specified time period. cohort studies. a prospective or follow-up, analytical, epidemiological study.
From Wikipedia, the free encyclopedia. Hydrofluoric acid is a solution of hydrogen fluoride (HF) in water. It is a precursor to almost all fluorine compounds, including pharmaceuticals such as fluoxetine (Prozac), diverse materials such as PTFE (Teflon), and elemental fluorine itself.
Potassium Fluoride is a good example for a typical alkali metal halide. The chemical formula for potassium fluoride is KF. In chemical synthesis and manufacture, the need for fluoride ion is satiated primarily by hydrogen fluoride; the second place always goes to potassium fluoride. Potassium fluoride can be refined from âCarobbiiteâ, a form which occurs very rarely in nature.