Based of the famous book Tabulae neurologicae by Antonio Scarpa, published Pavia, 1794 showing the nerves of the heart. Plants do not have a heart-like pump to move these vital energy sources. Instead, plants use a molecular pump. Twenty years ago, the Frommer identified one of the key components of this molecular pump, which actively loads a sugar called sucrose into the plant's veins, a tissue called phloem.