Digitalis purpurea range of colours from white through pink to purple, such as "Dalmatian Purple". Cultivated forms often show flowers completely surrounding the central spike, in contrast to the wild form, where the flowers only appear on one side. "D. purpurea" is easily grown from seed or purchased as potted plants in the spring. The following selections have gained the Royal Horticultural Society's Award of Garden Merit: "Digitalis purpurea" is hardy to zones 4-9. Digoxigenin (DIG) is a steroid found exclusively in the flowers and leaves of the plants "Digitalis purpurea" and "Digitalis lanata". It is used as a molecular probe to
Drug pollution Drug pollution Drug pollution or pharmaceutical pollution is pollution of the environment with pharmaceutical drugs and their metabolites, which reach the aquatic environment (groundwater, rivers, lakes, and oceans) through wastewater. Drug pollution is therefore mainly a form of water pollution. "Pharmaceutical pollution is now detected in waters throughout the world," said a scientist at the Cary Institute of Ecosystem Studies in Millbrook, New York. "Causes include aging infrastructure, sewage overflows and agricultural runoff. Even when wastewater makes it to sewage treatment facilities, they aren't equipped to remove pharmaceuticals." Most such pollution comes simply from the drugs having been cleared and