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.
Antimony pentafluoride, also known as antimony(V) fluoride, is a chemical compound.Its chemical formula is SbF 5. It has five antimony-fluorine bonds. The antimony is in its +5 oxidation state.ntimony pentafluoride, also known as antimony(V) fluoride, is a chemical compound. Its chemical formula is SbF 5. It has five antimony-fluorine bonds.