Effect of Ambient Humidity on UV/Visible Photodegradation of Melanin Thin Films

Sharma, Anup

doi:10.1111/j.1751-1097.2010.00753.x

Cited by 7 publications

(3 citation statements)

References 27 publications

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“…Recently, it has been shown that the increase in ambient humidity accelerates melanin photodegradation 47 . This provides a plausible explanation for our finding that birds confined to a humid environment produce more melanin, as this may be to counteract melanin degradation in humid regions.…”

Section: Discussionmentioning

confidence: 99%

Plastic plumage colouration in response to experimental humidity supports Gloger’s rule

López‐Rull

Salaberría

Fargallo

2023

Sci Rep

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Knowing how animals adapt their phenotype to local temperature and humidity is key to understanding not only ecogeographical rules, but also how species will manage climate change, as current models predict changes in global patterns of temperature and precipitation. In endotherms, colour adaptations in response to climate have been under investigated, and their acclimatization-the individual capacity to reversibly adjust phenotype in response to different environments-is unknown. Geographic trends can provide clues about abiotic variables involved in colouration, as postulated by Gloger’s rule, which predicts darker individuals in warm and humid regions. We tested whether house sparrows (Passer domesticus) can adjust colouration when faced with varying humidity conditions. We exposed birds to either a dry (humidity 45%) or a wet environment (70%) six months before their moult, and measured colouration in newly developed feathers in five parts of the body (bib, crown, crown stripe, belly and rump). As predicted by Gloger’s rule, birds in wet conditions developed darker (bib and belly) and larger (bib) melanised plumage patches, than birds in dry conditions. Our result provides the first unequivocal evidence that the ability of individual birds to adjust their colouration may be a potential adaptation to climatic changes in endotherms.

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Section: Discussionmentioning

confidence: 99%

Plastic plumage colouration in response to experimental humidity supports Gloger’s rule

López‐Rull

Salaberría

Fargallo

2023

Sci Rep

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“…By contrast, pheomelanin cannot undergo comproportionation reaction, and therefore, the generated radicals cannot decay within the pheomelanin molecule, which instead behaves as a photosensitizer that induces greater harm to cells than the eumelanin . Furthermore, melanin experiences photodegradations which can be facilitated by an enhanced ambient humidity . Melanin also shows enhanced UV light (below 600 nm) absorption after UV exposure …”

Section: Fundamentals Of the Interactions Of Melanin With Electromagn...mentioning

confidence: 99%

“…191 Furthermore, melanin experiences photodegradations which can be facilitated by an enhanced ambient humidity. 218 Melanin also shows enhanced UV light (below 600 nm) absorption after UV exposure. 219 Recently, Ilina et al employed multispectroscopic approaches, including transition absorption, fluorescence, and stimulated Raman spectroscopies, to elucidate the photodynamics of eumelanin.…”

Section: Fundamentals Of the Interactions Of Melanin With Electromagn...mentioning

confidence: 99%

Interactions of Melanin with Electromagnetic Radiation: From Fundamentals to Applications

Xie,

Dhinojwala,

Gianneschi

et al. 2024

Chem. Rev.

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Melanin, especially integumentary melanin, interacts in numerous ways with electromagnetic radiation, leading to a set of critical functions, including radiation protection, UV-protection, pigmentary and structural color productions, and thermoregulation. By harnessing these functions, melanin and melanin-like materials can be widely applied to diverse applications with extraordinary performance. Here we provide a unified overview of the melanin family (all melanin and melanin-like materials) and their interactions with the complete electromagnetic radiation spectrum (X-ray, Gamma-ray, UV, visible, near-infrared), which until now has been absent from the literature and is needed to establish a solid fundamental base to facilitate their future investigation and development. We begin by discussing the chemistries and morphologies of both natural and artificial melanin, then the fundamentals of melanin−radiation interactions, and finally the exciting new developments in high-performance melanin-based functional materials that exploit these interactions. This Review provides both a comprehensive overview and a discussion of future perspectives for each subfield of melanin that will help direct the future development of melanin from both fundamental and applied perspectives.

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Physiological and Pathological Functions of Melanosomes

Borovanský¹,

Riley²

2011

Melanins and Melanosomes

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Effect of Ambient Humidity on UV/Visible Photodegradation of Melanin Thin Films

Cited by 7 publications

References 27 publications

Plastic plumage colouration in response to experimental humidity supports Gloger’s rule

Plastic plumage colouration in response to experimental humidity supports Gloger’s rule

Interactions of Melanin with Electromagnetic Radiation: From Fundamentals to Applications

Physiological and Pathological Functions of Melanosomes

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