Lactarius repraesentaneus namely repraesentins B and C. These compounds were shown to promote the radicle elongation of lettuce seedlings by 136%, 118% and 184% at 67 ppm, respectively. Other compounds reported in 2006 are repraesentins D, E, and F. Repraesentin E showed the strongest growth promotion activity, 164% at 3.6 µm, of the three compounds toward the radicle elongation of lettuce seedlings. Lactarius repraesentaneus Lactarius repraesentaneus, commonly known as the northern bearded milkcap, the northern milkcap, or the purple-staining milkcap, is a species of fungus in the Russulaceae family. It has a northerly distribution, and is found in temperate regions of North
Drill bit shank One particular type of reduced-shank drill bits are Silver & Deming (S&D) bits, whose sets run from to drill body diameter with a standard reduced shank for all. This allows drill presses with chucks to run the larger drills. S&D bits are long with a flute length. The name comes from a company in Salem, Ohio that broke up into other companies circa 1890; bits of this design were popularized by that company. The flats of a hex shank can either be machined on a round shank, as in the photograph, or be the natural flats of hex bar stock.