title: Circannual rhythm of the melanin content in frog liver (Rana esculenta L.).
abstract: The melanin content of Rana esculenta L. liver varies according to a circannual statistically significant rhythm, as shown by variance and single cosinor analysis. The maximum is found in autumn-winter, the minimum in spring-summer. The linear regression analysis shown a negative correlation between the amount of melanin and the environmental temperature.
authors.affiliation: Istituto di Biologia Generale dell' Universitá, Catania, Italia.
authors.forename: C
authors.initials: C
authors.lastname: Corsaro
authors.forename: M
authors.initials: M
authors.lastname: Scalia
authors.forename: F
authors.initials: F
authors.lastname: Sinatra
authors.forename: G
authors.initials: G
authors.lastname: Sichel
mesh_terms: D000704:Analysis of Variance; D000818:Animals; D001683:Biological Clocks / Q000502:physiology; D008099:Liver / Q000032:analysis / Q000378:metabolism* / Q000502:physiology; D008543:Melanins / Q000032:analysis / Q000378:metabolism*; D011893:Rana esculenta / Q000378:metabolism* / Q000502:physiology; D012044:Regression Analysis; D012621:Seasons
chemical_list: D008543:Melanins