The use of acidic MPAs (pH 2–4) is the default in pharmaceutical testing because they suppress silanol ionization (from Si-OH to Si-O -) and improve peak shape for basic drugs. However, highly ...

The ray florets do the opening and closing, covering the inner disc florets when closed. On cloudy cool days the daisies might not open at all. The movement of the petals is likely to be as a result ...