Results 21 to 30 of about 609 (106)
Teaching Neuro Images : “Penguin” or “hummingbird” sign and midbrain atrophy in progressive supranuclear palsy [PDF]
Neurology, 2009 An 82-year-old man presented to us with a 2-year history of progressive difficulty walking. On examination, he had bradykinesia, bradyphrenia, …
Jerome J, Graber, Robert, Staudinger
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Bio‐inspired nanophotonics: Structural color, chirality, and resonance metasurfaces
InfoMat, EarlyView.A butterfly‐wing‐inspired anisotropic plasmonic flatband resonant metasurface. Insets, photo of the butterfly, Sasakia charonda, and the SEM image of its wing scale (above); the SEM image of the metasurface (below). Abstract The dazzling colors of butterfly wings and hummingbird feathers are not painted with pigments, but crafted by nature's invisible ...
Weihan Liu, Yao Liang, Din Ping Tsai
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FXTAS and the Spectrum of FMR1 Premutation‐Associated Phenotypes in Latin America: A Scoping Review
Movement Disorders Clinical Practice, EarlyView.Abstract Background Fragile X–associated tremor/ataxia syndrome (FXTAS) is a late‐onset neurodegenerative disorder caused by FMR1 premutation expansions (55–200 CGG repeats). Although well described in populations of predominantly European ancestry, FXTAS remains poorly characterized in Latin America due to limited awareness, restricted access to ...
Amy Schmidmajer +6 more
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Improving spine‐based age estimation in centrarchid fishes using otolith‐derived training sets
Journal of Fish Biology, EarlyView.Abstract Nonlethal age determination is a priority in fish biology contexts where sacrifice is restricted, but estimates derived from nonlethally attainable structures tend to suffer from poor precision and accuracy relative to necessarily lethal, otolith‐derived estimates.
Matthew P. Woo +4 more
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Ecology and Evolution, Volume 16, Issue 7, July 2026.We evaluated nectar robbery by native and invasive bumblebees in the hummingbird‐pollinated shrub Desfontainia fulgens in southern Chile. Nectar robbery strongly reduced nectar standing crop and altered floral visitation patterns, but these proximate effects did not translate into reduced seed production under natural pollination conditions.
Carlos E. Valdivia, José I. Orellana
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Biological Reviews, Volume 101, Issue 3, Page 1406-1462, June 2026.ABSTRACT Oropharyngeal food processing exhibits a remarkable diversity among vertebrates, reflecting the evolution of specialised ‘processing centres’ associated with the mandibular, hyoid, and branchial arches. Although studies have detailed various food‐processing strategies and mechanisms across vertebrates, a coherent and comprehensive terminology ...
Daniel Schwarz +6 more
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Journal of the Royal Anthropological Institute, Volume 32, Issue 2, Page 365-383, June 2026.Anthropologists, in common with social theorists more generally, have often understood social life as an emergent phenomenon grounded in practices of creativity and improvisation. Where stasis and continuity feature, these are often presented as illusory manifestations of underlying processes of ‘invention’, or as external impositions upon otherwise ...
Paolo Heywood, Thomas Yarrow
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Molecular Ecology, Volume 35, Issue 11, June 2026.ABSTRACT Epigenetic modifications to DNA are proposed to underpin plastic responses to environmental change, and the manner in which DNA methylation contributes to plasticity likely differs among tissues. However, few studies have investigated tissue‐specific DNA methylation responses to ecologically relevant environmental stressors in natural settings.
Qiting Cai +4 more
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A Visual Rating Scale for the Hummingbird Sign with Adjustable Diagnostic Validity
Journal of Parkinson’s DiseaseBackground: Although the hummingbird sign (HBS) is a distinctive feature of progressive supranuclear palsy (PSP) VS. idiopathic Parkinson’s disease (IPD) and other parkinsonian disorders, there are no consensus criteria for its identification. Objective:
Young Eun Kim +4 more
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Ecological change may be a common initiator of evolutionary pollinator shifts
New Phytologist, Volume 250, Issue 6, Page 3572-3583, June 2026.Summary Although evolutionary pollinator shifts are accepted as major sources of floral and species diversity in angiosperms, the mechanisms triggering pollinator shifts remain largely unexplored. In 1970, Stebbins proposed that ecological change may be a common initiator of evolutionary pollinator shifts, but empirical tests of Stebbins' hypothesis ...
Agnes S. Dellinger
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