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Carotenosis is a benign and reversible medical condition where an excess of dietary carotenoids results in orange discoloration of the outermost skin layer. The discoloration is most easily observed in light-skinned people and may be mistaken for jaundice .
Overconsumption of beta-carotene can only cause carotenosis, a harmless and reversible cosmetic condition in which the skin turns orange. Preformed vitamin A absorption and storage in the liver occur very efficiently until a pathologic condition develops. [21] When ingested, 70–90% of preformed vitamin A is absorbed and used. [21]
β-Carotene (beta-carotene) is an organic, strongly colored red-orange pigment abundant in fungi, [7] plants, and fruits. It is a member of the carotenes, which are terpenoids (isoprenoids), synthesized biochemically from eight isoprene units and thus having 40 carbons.
This glossary of biology terms is a list of definitions of fundamental terms and concepts used in biology, the study of life and of living organisms.It is intended as introductory material for novices; for more specific and technical definitions from sub-disciplines and related fields, see Glossary of cell biology, Glossary of genetics, Glossary of evolutionary biology, Glossary of ecology ...
A kenning (Old English kenning [cʰɛnːiŋɡ], Modern Icelandic [cʰɛnːiŋk]) is a circumlocution, an ambiguous or roundabout figure of speech, used instead of an ordinary noun in Old Norse, Old English, and later Icelandic poetry.
For example, pitting looks like depressions in the hard part of the nail. Pitting is to be associated with psoriasis , affecting 10% - 50% of patients with that disorder. [ 5 ] Pitting also may be caused by a variety of systemic diseases, including reactive arthritis and other connective tissue disorders , sarcoidosis , pemphigus , alopecia ...
Vitamin A is a fat-soluble vitamin that is an essential nutrient.The term "vitamin A" encompasses a group of chemically related organic compounds that includes retinol, retinyl esters, and several provitamin (precursor) carotenoids, most notably β-carotene (beta-carotene).
Thus in species that have other pigment cell-types, for example xanthophores, albinos are not entirely white, but instead display a pale yellow color. More common than a complete absence of pigment cells is localized or incomplete hypopigmentation , resulting in irregular patches of white on an animal that otherwise has normal coloring and ...