Girasol definition, an opal that reflects light in a bright luminous glow. See more.
Pheophytin or phaeophytin (abbreviated Pheo) is a chemical compound that serves as the first electron carrier intermediate in the electron transfer pathway of Photosystem II (PS II) in plants, and the photosynthetic reaction center (RC P870) found in purple bacteria.
physostigmine. A reversible anticholinesterase drug used as a parasympathomimetic which, when used in the eye constricts the pupil. It may be used in solution of 0.25-1% or ointment 0.25-0.50% in the treatment of glaucoma, but because of its side-effects its usage is rare nowadays.hyÂ·soÂ·stigÂ·mine. An alkaloid of physostigma; it is a reversible inhibitor of the cholinesterases and prevents destruction of acetylcholine; used as a cholinergic agent, and experimentally to enhance the action of acetylcholine at any of its sites of liberation. Synonym(s): eserine.