Results 91 to 100 of about 100,617 (294)

The morphosedimentary record of glacial to postglacial environmental changes in West Wiyâshâkimî impact crater lake and adjacent areas, northern Québec, Canada

open access: yesBoreas, EarlyView.
Crater lakes in core regions of former ice sheets have the potential to preserve long‐term sedimentary archives that are otherwise rare in glaciated landscapes due to pervasive glacial erosion. Lake Wiyâshâkimî, an impact crater lake located in the inner core of the Québec‐Labrador Dome of the Laurentide Ice Sheet, provides a rare example of such a ...
Etienne Brouard, Patrick Lajeunesse
wiley   +1 more source

The Ability of Non-Music Majors to Self-Evaluate at the End of a Music Course

open access: yesJournal of Educators Online, 2016
The researchers of this study investigated the participants’ (N = 177) use of a self-evaluation tool employed at the end of an online undergraduate music course that fulfilled the Texas general education requirement for the creative arts.
Dan Keast, Larke Tapper
doaj  

Shifts in hexapod diversification and what Haldane could have said [PDF]

open access: yes, 2002
Data on species richness and taxon age are assembled for the extant hexapod orders (insects and their six-legged relatives). Coupled with estimates of phylogenetic relatedness, and simple statistical null models, these data are used to locate where, on ...
Davies D. A. L.   +2 more
core   +3 more sources

Evolutionary implications of a deep‐time perspective on insect pollination

open access: yesBiological Reviews, EarlyView.
ABSTRACT Plant pollination by insects represents one of the most transformative and iconic ecological relationships in the natural world. Despite tens of thousands of papers, as well as numerous books, on pollination biology published over the past 200 years, most studies focused on the fossil record of pollinating insects have only been published in ...
David Peris   +10 more
wiley   +1 more source

Colorectal cancer presenting as tuboovarian abscess in a 40 year old patient with previous tubal occlusion

open access: yesCase Reports in Women's Health, 2016
Background: Although pelvic inflammatory disease can be seen after tubal occlusion, tuboovarian abscess is rare, with only 38 cases reported since 1975 [1].
Joy Anderson, Clyde Ellis, Jonathan Lugo
doaj   +1 more source

Separate Determination of Strontium and Barium Mass Fractions in Calcite and Dolomite in Carbonate Rocks by a Multi‐step Sequential Leaching Procedure

open access: yesGeostandards and Geoanalytical Research, EarlyView.
Key Points A ten‐step sequential leaching procedure was applied to dissolve carbonate samples, with 10% of the sample mass dissolved in each step. Calcite dissolves preferentially compared with dolomite. Strontium and barium concentrations released in each step are proportional to the dissolved calcite‐to‐dolomite ratio.
Kaiyu Wu   +3 more
wiley   +1 more source

Coccidioidomycosis in pregnancy: Case report and literature review of associated placental lesions

open access: yesCase Reports in Women's Health, 2016
Background: Coccidioidomycosis is an endemic fungal infection found most commonly in the Southwestern United States, Northwestern Mexico, and parts of Central and South America. Although infection is relatively uncommon during pregnancy, it is imperative
Heloise Labuschagne   +9 more
doaj  

The radiation of cynodonts and the ground plan of mammalian morphological diversity [PDF]

open access: yes, 2013
Cynodont therapsids diversified extensively after the Permo-Triassic mass extinction event, and gave rise to mammals in the Jurassic. We use an enlarged and revised dataset of discrete skeletal characters to build a new phylogeny for all main cynodont ...
Anderson MJ   +17 more
core   +1 more source

Lungfish‐like antero‐labial tooth addition and amphibian‐like enameloid‐enamel transition in the coronoid of a Devonian stem actinopterygian

open access: yesJournal of Anatomy, EarlyView.
The tooth patterning logic, which cannot be inferred from surface morphology, is revealed by visualizing buried tooth remnants in 3D. The primary teeth are added labially, initially organized in radial rows, which transition into linear rows where the coronoid becomes slender.
Donglei Chen
wiley   +1 more source

Gut microbiota as a trigger of accelerated directional adaptive evolution. Acquisition of herbivory in the context of extracellular vesicles, microRNAs and inter-kingdom crosstalk [PDF]

open access: yes, 2017
According to a traditional view, the specific diet in vertebrates is one of the key factors structuring the composition of the gut microbiota. In this interpretation, the microbiota assumes a subordinate position, where the larger host shapes, through ...
Romano, Marco
core   +1 more source

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