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Brown-Vialetto-Van-Laere syndrome (BVVL), is a rare, progressive, inherited neurodegenerative disorder that most often manifests in infancy or early childhood. Since 2010, mutations in the SLC52A1, SLC52A2, or SLC52A3 genes, which encode riboflavin transporters, have been identified as the cause of BVVL.
Manganese violet is the inorganic compound with the formula NH 4 MnP 2 O 7. [1] As implied by its name and composition, it is a purple, inorganic pigment . [ 2 ] Because it is often impure, the pigment's hue is varied. [ 3 ]
Pigment Violet 29 (C.I. 71129) is an organic compound that is used as a pigment [1] and vat dye. Its colour is dark red purple, or bordeaux. [1] [2] Structurally, it is a derivative of perylene, although it is produced from acenaphthene. It is a less common dye compared to related derivatives such as pigment red 190 (Vat Red 29). [3] [4]
It is known in medicine as Gentian violet (or crystal violet or pyoctanin(e) [1]) and is the active ingredient in a Gram stain, used to classify bacteria. It is used as a pH indicator, with a range between 0 and 1.6. The protonated form (found in acidic conditions) is yellow, turning blue-violet above pH levels of 1.6. [4]
Beckman DU640 UV-Vis spectrophotometer. Ultraviolet–visible spectrophotometry (UV–Vis or UV-VIS) [1] [2] [3] refers to absorption spectroscopy or reflectance spectroscopy in part of the ultraviolet and the full, adjacent visible regions of the electromagnetic spectrum. [2]
Violet Paget was born in France on 14 October [1] 1856, at Château St Leonard, Boulogne, to British expatriate parents, Henry Ferguson Paget and Matilda Lee-Hamilton (née Adams). Violet Paget was the half-sister of Eugene Jacob Lee-Hamilton (1845–1907) [ 2 ] by her mother's first marriage, and from whose surname she adapted her own pseudonym .