Results 51 to 60 of about 30,033 (263)
PLoS ONE, 2019 Mutualistic interactions are powerful drivers of biodiversity on Earth that can be represented as complex interaction networks that vary in connection pattern and intensity.
Claudia I Rodríguez-Flores +3 more
doaj +1 more source
Harmonic hopping, and both punctuated and gradual evolution of acoustic characters in Selasphorus hummingbird tail-feathers. [PDF]
, 2014 Models of character evolution often assume a single mode of evolutionary change, such as continuous, or discrete. Here I provide an example in which a character exhibits both types of change.
Clark, Christopher James
core +2 more sources
Foraging ability of rufous hummingbirds on hummingbird flowers and hawkmoth flowers. [PDF]
Proceedings of the National Academy of Sciences, 1992 We examine the suitability of ornithophilous flowers and sphingophilous flowers in Ipompsis and Aquilegia for nectar foraging by the hummingbird Selasphorus rufus. In S. rufus, bill length averages 18.9 mm in females and 17.3 mm in males. Maximal tongue extension approximates bill length, suggesting that birds can feed from floral tubes up to 33.5 mm ...
Grant, V., Temeles, Ethan J.
openaire +3 more sources
Pediatric Complications of Automated Tympanostomy Tube Systems: MAUDE Analysis and Systematic Review
The Laryngoscope, EarlyView.Automated tympanostomy tube delivery systems (TDS) were developed to streamline in‐office procedures, but their effectiveness remains uncertain due to challenges with achieving adequate anesthesia and immobility in pediatric patients. While postprocedural complication rates were comparable to traditional tympanostomy tubes, concerns regarding ...
Emily A. Clementi +2 more
wiley +1 more source
Brazilian Journal of BiologyHummingbird communities tend to respond to variation in resources, having a positive relationship between abundance and diversity of food resources and the abundance and/or diversity of hummingbirds.
LC Rodrigues, M Rodrigues
doaj +1 more source
Quantifying the dynamic wing morphing of hovering hummingbird [PDF]
Royal Society Open Science, 2017 Animal wings are lightweight and flexible; hence, during flapping flight their shapes change. It has been known that such dynamic wing morphing reduces aerodynamic cost in insects, but the consequences in vertebrate flyers, particularly birds, are not ...
Masateru Maeda +4 more
doaj +1 more source
Urbanization, environmental stabilization and temporal persistence of bird species: A view from Latin America [PDF]
, 2018 Background. A scarcely studied consequence of urbanization is the effect of temporal stabilization of the environment on bird communities. This alteration is thought to dampen environmental variations between day and night, seasons and years, promoting a
Leveau, Lucas Matias
core +2 more sources
Bedside Assessment of Downgaze Limit by Amplitude
Movement Disorders Clinical Practice, EarlyView.Abstract Background Bedside assessment of downgaze palsy could be difficult, due to the lack of a marker to differentiate normal from palsy, which could delay the diagnosis of progressive supranuclear palsy (PSP). Amplitude based bedside assessment using the intercanthal line as a marker was reported to easily identify, quantify, and record downgaze ...
Tao Xie +6 more
wiley +1 more source
Hovering hummingbird wing aerodynamics during the annual cycle. I. Complete wing [PDF]
Royal Society Open Science, 2017 The diverse hummingbird family (Trochilidae) has unique adaptations for nectarivory, among which is the ability to sustain hover-feeding. As hummingbirds mainly feed while hovering, it is crucial to maintain this ability throughout the annual cycle ...
Yonathan Achache +2 more
doaj +1 more source
Pt Nanoparticle Disintegration at Oxide Interfaces Enhances CO Oxidation Catalysis
Small, EarlyView.Supported Pt nanoparticles on TiO2 dynamically disintegrate during CO oxidation into single atoms or clusters at CeOx‐TiO2 interfaces, tripling the specific mass activity at 150 °C. Pt‐CO interactions weaken Pt─Pt bonds, while electronic Pt‐Ce coupling stabilizes Pt‐CO* at interfaces. Oxygen vacancies trap Pt‐CO*, but O2 regenerates the vacancy, paving
Eunji Kang +13 more
wiley +1 more source