The green or gold leaf hostas including the variegated forms of these colored leaf perennials are a slugs idea of smorgasbord delights. The waxy coated leaves of this blue hosta are plants that slugs donât like to eat.
Skin pigmentation. Melanin, whose primary function is in pigmentation, has many more important functions to perform in the human body. Protection from UV radiation. Melanin functions as a sunscreen and as a broad spectrum sun radiation absorbent. The absorbed energy causes redox reactions, and both eumelanin and pheomelanin form free radical species. Eumelanin, being more photostable scavenges the originated oxidative species and neutralizes them.
Melanins have the power to absorb ultraviolet rays, and thus they protect the skin from attack by solar radiation. This is translated into a more or less intense tanning of the skin. A palette of colour. There are two types of melanin: pheomelanin which is yellow coloured, and eumelanin which is black. It is the proportion and size of these pigments, without forgetting the carotenoids and the blood micro-circulation which gives the wide range of skin colour.