1 “... long before the advent of quantum mechanics. The ball-and-stick models of molecules naturally exhibit...”

2 “... recently, trace metal analysis has in general achieved a new maturity with the advent of atomic absorption...”

3 “..., reactions and mobility have only recently become feasible with the advent of powerful spectroscopic...”

4 “...With the recent advent of nanotechnology, research and development in the area of nanostructured...”