Use of the DFE reflects the higher bioavailability of synthetic folic acid found in supplements and fortified food compared to that of naturally occurring food folates (18). 1  1 microgram (Î¼g) of food folate provides 1 Î¼g of DFEs. 2  1 Î¼g of folic acid taken with meals or as fortified food provides 1.7 Î¼g of DFEs.
The Four Seasons (Complete)Vivaldi cast The Four Seasons in the form of four concertos for solo violin and string orchestra. Concertos are designed to feature an instrument which not only enjoys an especially prominent role but plays technically brilliant, or virtuosic, passages.
The violin, viola, cello, and double bass make up the family of  bowed string instruments. The bow is usually made of horse tail  hair stretched over a wood frame, and rosin (a solid resin  extracted from pine trees) is applied to the hair so that it has  sufficient friction to vibrate the strings. Like the guitar and  harpsichord, the strings on bowed instruments can also be plucked.