Results 81 to 90 of about 5,114 (205)
Journal of Threatened Taxa, 2020 This work provides three new photographic records and evidence of increase in distribution of Heloderma alvarezi based on different encounters between human activities and the displacement of this species along the central coast of Oaxaca, Mexico. Until
Jesús Garcia-Grajales +3 more
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Melanization and Tyrosinase Activity
Journal of Investigative Dermatology, 1971 Purified soluble tyrosinase isolated from the melanosomes of Harding-Passey mouse melanoma was incubated with L-dopa. The reaction velocity of the tyrosinase thus incubated decreased significantly. There was an inverse linear relationship between the concentration of dopa in the preincubation mixture and the reaction velocity of the tyrosinase which ...
Seiji, Makoto, Miyazaki, Kazuhiro
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International Journal of ZoologyColour pattern polymorphisms are widespread in reptiles and may have important ecological and evolutionary implications. This study confirms the presence of colour pattern polymorphisms in Testudo hermanni populations from Mallorca (Balearic Islands ...
Marta Salom-Oliver +2 more
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Rare colour morphs in the slow worm Anguis fragilis in Norway
Fauna NorvegicaThe frequency of melanism in Natrix natrix and Vipera berus is known to be high in the Nordic countries. However, melanism in the slow worm Anguis fragilis has previously never been documented in Norway.
Beate Strøm Johansen, Pål Sørensen
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Frontiers in Ecology and Evolution, 2020 Melanin pigments color the integument of vertebrates with shades of rufous, gray, and black. In numerous wild species, melanin-based coloration associates to different behavioral, physiological, and morphological traits, yet the proximate basis of such ...
Luis M. San-Jose, Alexandre Roulin
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Maintenance of polymorphism in the orb weaving spider species Agalenatea redii (Araneae, Araneidae) [PDF]
, 2012 The maintenance of polymorphism within populations may be the consequence of several elements of species life history such as use of space, activity rhythms, predation, parasitism and reproduction.
François, Olivier +3 more
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Atypical Fibroxanthoma/Pleomorphic Dermal Sarcoma With Osseous Metaplasia: A Series of Three Cases
Journal of Cutaneous Pathology, Volume 53, Issue 5, Page 407-413, May 2026.ABSTRACT Atypical fibroxanthoma (AFX) and pleomorphic dermal sarcoma (PDS) are rare mesenchymal tumors typically arising on sun‐damaged skin of the head and neck in elderly patients. PDS is a more aggressive tumor but with similar demographics, cellular morphology, immunohistochemical features, and genetic findings.
Taylor Novice +3 more
wiley +1 more source
Condition-dependence, pleiotropy and the handicap principle of sexual selection in melanin-based colouration. [PDF]
, 2015 The signalling function of melanin-based colouration is debated. Sexual selection theory states that ornaments should be costly to produce, maintain, wear or display to signal quality honestly to potential mates or competitors.
Roulin, A.
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, 1942 13. Melanitis leda (Linnaeus). Papílío leda Linnaeus, Syst. Nat. 1 (2): 773, 1767. M elanítís Ieda (Linnaeus) Walker, Ent. Soc. London, Trans., 449, 1895. Kershaw, Butterflies of Hong Kong, 24, pl. 3, figs. 2, 3; pl. 1 a, figs. 9, 10, 1907. Agana Swamp, May 4, Usinger; gully near Mt. Chachao, May 16, Swezey; Piti, Oct. 12, 29,
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International Journal of Cancer, Volume 158, Issue 6, Page 1517-1527, 15 March 2026.What's new? Oral cancer burden is high in India. Risk stratification for selection of high‐risk individuals could enable early detection through efficient screening programs. We conducted a cross‐sectional screening study in Northeast India to develop and validate an oral precancer/cancer risk prediction model.
Kunal Oswal +17 more
wiley +1 more source