Results 121 to 130 of about 64,126 (157)
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Polymorphs and Colors of Polydiacetylenes: A First Principles Study
Journal of the American Chemical Society, 2009Polydiacetylenes (PDAs) are exceptional polymeric materials with pi-conjugated backbones. Several of them can undergo chromogenic transitions under a wide range of external stimuli. Herein we investigate the electronic structure and the resulting properties of model and experimental PDAs, by means of first principles condensed matter calculations.
Filhol, Jean-Sébastien +6 more
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Correlates of color polymorphism in coconut crabs Birgus latro
Zoology, 2018Color polymorphisms are widespread in nature and can be maintained by several evolutionary processes. We used the coconut crab (Birgus latro) red/blue color polymorphism as a test case to explore the functional significance of intraspecific variation in crab coloration. Across our study sites on Pemba and Chumbe Islands, Tanzania, and Christmas Island,
Tim, Caro, Victoria M, Morgan
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Polymorphism of Cone Pigments among Color Normals: Evidence from Color Matching
1989Two different experiments reveal a discrete variation in color matching among individuals having normal color vision. (1) We have examined a large sample of color-normal observers using an adaptation of the Rayleigh color match. The color matches made by males fell into two distributions. The matches made by females were trimodally distributed.
Jay Neitz, Gerald H. Jacobs
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Polymorphic Color Vision in Primates: Evolutionary Considerations
2011Color provides a reliable cue for object detection and identification during various behaviors such as foraging, mate choice, predator avoidance, and navigation. The total number of colors that a visual system can discriminate is largely dependent on the number of different spectral types of cone opsins present in the retina and the spectral ...
Shoji Kawamura +5 more
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Entomology, Ornithology & Herpetology: Current Research, 2019
Maintenance of intraspecific polymorphisms is important for biodiversity. The aphid Macrosiphoniella yomogicola has two color morphs (green and red) in Hokkaido. Their primary attending ants (Lasius japonicus) can manipulate the frequency of the green morph to match that of the red morph to maintain the polymorphism in an aphid colony.
Eisuke Hasegawa +3 more
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Maintenance of intraspecific polymorphisms is important for biodiversity. The aphid Macrosiphoniella yomogicola has two color morphs (green and red) in Hokkaido. Their primary attending ants (Lasius japonicus) can manipulate the frequency of the green morph to match that of the red morph to maintain the polymorphism in an aphid colony.
Eisuke Hasegawa +3 more
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Can a flower color ancestral polymorphism transcend speciation?
2023AbstractPolymorphisms are common in nature, but they are rarely shared among closely related species. They could originate through convergence, ancestral polymorphism, or introgression. Although shared neutral genomic variation is commonplace, very few examples of shared functional traits exist.
Mercedes Sánchez-Cabrera +7 more
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Color Polymorphism and Predation in a Lake Victoria Cichlid Fish
Copeia, 2008Haplochromine cichlid fish have radiated into hundreds of species in East-African lakes, possibly driven by divergent sexual selection on body coloration. We studied the color polymorphic Lake Victoria cichlid Neochromis omnicaeruleus, in which a presumably ancestral phenotype with blue males and brown females co-occurs with two distinct classes of ...
Maan, Martine E. +5 more
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Nature of Color Diversity in Phenylenevinylene-Based Polymorphs
Crystal Growth & Design, 2019In this work we present a joint experimental and theoretical study of the light emitting properties of (E,E)-2,5-dimethoxy-1,4-bis[2-(4-carboxylatestyryl)]benzene, a phenylenevinylene (PV, from now...
Juan C. Cárdenas +9 more
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Color vision polymorphism and red-green learning
Optical Society of America Annual Meeting, 1991Our version of the idea that the red-green distinction is associatively learned by experience was spawned by the notion that neural connections in the retina and LGN may be blind to their originating cone types [middle-wavelength-sensitive (M) or long-wavelength-sensitive (L)].
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Weather-Related Color Polymorphism of Rothschildia lebeau (Saturniidae)
Bulletin of the Entomological Society of America, 1984In 1868, Guerin-Meneville described an orange-colored male saturniid moth from the vicinity of Caracas, Venezuela, as Rothschildia lebeau . In 1905, Schaus described a rusty brown male Honduran Rothschildia as R. aroma and in 1921 he described a pinkish male from Guatemala as R. morana .
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