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.
Melanocyte-stimulating hormone is a collective name for a group of peptide hormones produced by the skin, pituitary gland and hypothalamus in response to ultraviolet (UV) radiation. It plays a key role in producing coloured pigmentation found in the skin, hair and eyes.n Addisonâs disease, the adrenal glands do not produce enough hormones (including cortisol). This leads to a positive feedback loop where the hypothalamus stimulates the pituitary gland to release more adrenocorticotropic hormone to try and stimulate the adrenal glands to produce more cortisol.