A fascinating pattern in nature is the uneven distribution of biodiversity among clades, some with low species richness and phenotypic variation in contrast to others with remarkable species richness and phenotypic diversity. In animals, communication signals are crucial for intra- and interspecific interactions, and are likely an important factor in speciation. However, evidence for the association between the evolution of such signals and speciation is mixed. In hummingbirds, plumage coloration is an important communication signal,...
Plasmodium infection induces cross-reactive antibodies to carbohydrate epitopes on the SARS-CoV-2 Spike proteinSarah Lapidus, Feimei Liu, Arnau Casanovas-Massana, Yile Dai, John D. Huck, Carolina Lucas, Jon Klein, Renata B. Filler, Madison S. Strine, Mouhamad Sy, Awa B. Deme, Aida S. Badiane, Baba Dieye, Ibrahima Mbaye Ndiaye, Younous Diedhiou, Amadou Moctar Mbaye, Cheikh Tidiane Diagne, Inés Vigan-Womas, Alassane Mbengue, Bacary D. Sadio, Moussa M. Diagne, Adam J. Moore, Khadidiatou Mangou, Fatoumata Diallo, Seynabou D. Sene … & Amy K. Bei
Individuals with acute malaria infection generated high levels of antibodies that cross-react with the SARS-CoV-2 Spike protein. Cross-reactive antibodies specifically recognized the sialic acid moiety on N-linked glycans of the Spike protein and do not neutralize in vitro SARS-CoV-2. Sero-surveillance is critical for monitoring and projecting disease burden and risk during the pandemic; however, routine use of Spike protein-based assays may overestimate SARS-CoV-2 exposure and population-level immunity in malaria-endemic countries.
Genetic data and niche differences suggest that disjunct populations of Diglossa brunneiventris are not sister lineagesJuan Luis Parra, Ana Maria Gutiérrez-Zuluaga, Catalina González-Quevedo, Jessica A. Oswald, Ryan S. Terrill & Jorge L. Pérez-Emán
Disjunct distributions within a species are of great interest in systematics and biogeography. This separation can function as a barrier to gene flow when the distance among populations exceeds the dispersal capacity of individuals, and depending on the duration of the barrier, it may eventually lead to speciation. Here we describe patterns of geographic differentiation of two disjunct populations of Diglossa brunneiventris separated by approximately 1000 km along the Andes. Diglossa brunneiventris vuilleumieri is isolated...
Feather iridescence of Coeligena hummingbird species varies due to differently organized barbs and barbulesMarco Giraldo, Juliana Sosa & Doekele Stavenga
Hummingbirds are perhaps the most exquisite bird species because of their prominent iridescence, created by stacks of melanosomes in the feather barbules. The feather colours crucially depend on the nanoscopic dimensions of the melanosome, and the displayed iridescence can distinctly vary, dependent on the spatial organization of the barbs and barbules. We have taken the genus Coeligena as a model group, with species having feathers that strongly vary in their spatial reflection properties. We studied...
A Computational Analysis of Different Geometric Ratios at the Input of a Secondary Fluid that Affects the Efficiency of a Subsonic Air-Air EjectorJhon Fredy HINCAPIE-MONTOYA, Jorge Andres SIERRA-DEL-RIO, Edwar Andres TORRES-LOPEZ & Diego Andres HINCAPIE-ZULUAGA
For this study, the computational fluid dynamics (CFD) technique was used to investigate the combined effects of different geometric parameter relationships; inclination angle variation of the secondary fluid inlet, different lengths of the mixing chamber, and different separation values between the nozzle outlet and the input of the mixing chamber, in an air-air ejector used in a subsonic regime. As a working fluid, the air was used as an ideal gas and its viscosity was...
University of Antioquia5
Serimmune (United States)1
Noguchi Memorial Institute for Medical Research1
Natural History Museum of Los Angeles County1
Pascual Bravo Institution University1
University of Groningen1
University of Nevada Reno1