Results 41 to 50 of about 47,397 (267)

Taxonomic reassessment of fossil Sequoia and Protosequoia from the Upper Miocene of Central Honshu, Japan, with implications for leaf morphological variation in extant S. sempervirens

American Journal of Botany, EarlyView.
Abstract Premise Since its emergence in the Mesozoic, Sequoia (Cupressaceae) has been considered to possess conserved leaf morphology. However, recent studies have shown that the leaves of extant S. sempervirens become smaller, with a scale form, with increasing tree height.
Shun Ikeda, Arata Momohara
wiley   +1 more source

New records of extinct Icacinaceae from Paleocene rainforests of northwestern South America

American Journal of Botany, EarlyView.
Abstract Premise This study describes three new records of Icacinaceae—Punctiuga bachue gen. et sp. nov., Palaeophytocrene paramoae sp. nov., and Goweria bacatana sp. nov. from the Paleocene (Selandian–Thanetian) Bogotá Formation in Colombia—improving understanding of the distribution and evolution of this family in the Neotropics.
Laura M. Puente‐Santos, Mónica R. Carvalho, Ethan Shirley, Fabiany Herrera   +3 more
wiley   +1 more source

Sensitivity of the ITCZ Location to Ocean Forcing Via Q‐Flux Green's Function Experiments

Geophysical Research Letters, 2018
The sensitivity of the intertropical convergence zone (ITCZ) position to forcing patterns is important for understanding changes in tropical rainfall.
Bryce E. Harrop, Jian Lu, Fukai Liu, Oluwayemi A. Garuba, L. Ruby Leung   +4 more
doaj   +1 more source

The oldest mysticete in the Northern Hemisphere

Current Biology
Extant baleen whales (Mysticeti) uniquely use keratinous baleen for filter-feeding and lack dentition, but the fossil record clearly shows that "toothed" baleen whales first appeared in the Late Eocene.1 Globally, only two Eocene mysticetes have been found, and both are from the Southern Hemisphere: Mystacodon selenensis from Peru, 36.4 mega-annum (Ma)
Cheng-Hsiu Tsai, James L. Goedert, Robert W. Boessenecker   +2 more
openaire   +2 more sources

Speech Biomarkers for Quantifying Effects of Subthalamic Deep Brain Stimulation in Parkinson's Disease

Annals of Neurology, EarlyView.
Objective Dysarthria is one of the most common and disabling side effects of subthalamic nucleus deep brain stimulation (STN‐DBS) in Parkinson's disease (PD). Stimulation often exacerbates speech dysfunction beyond the effects of PD progression, likely because of current spread to structures surrounding the STN.
Petr Krýže, Mário Sousa, Vojtěch Illner, Adriana Jorge, Matilde Castelli, Ines Debove, Andreia D. Magalhães, Julia Waskönig, Lenard Lachenmayer, Joan Philipp Michelis, Gerd Tinkhauser, Deborah Amstutz, Marie Elise Maradan‐Gachet, Katrin Petermann, Claudio Pollo, Tobias Nef, Paul Krack, Jan Rusz   +17 more
wiley   +1 more source

Monitoring Antiseizure Medication Change Using Ultra Long‐Term Electroencephalogram: A Multicenter Study

Annals of Neurology, EarlyView.
Objective Medication dose adjustments are common in treatment‐resistant epilepsy, but lack robust evidence, and patient‐reported seizure diaries have known limitations. We assessed whether ultra long‐term subcutaneous electroencephalogram (sqEEG) improves detection of seizure frequency changes after antiseizure medication adjustments.
Pedro F. Viana, Matthew McWilliam, Johannes Koren, Christina Duarte, Tamara Lisy, Christoph Baumgartner, Karl Rössler, Matthias Tomschik, Adriana Celdrán de Castro, Rodrigo Rocamora, Laura Vilella, Guido Rubboli, Sigge Weisdorf, Cecilia Friedrichs‐Maeder, Troels W. Kjaer, Sanchita Bhatia, Dympna McAleer, Khalid Hamandi, Deborah Spencer, Rajiv Mohanraj, Mark P. Richardson   +20 more
wiley   +1 more source

A detailed redescription of a skeletally immature ‘Redondasaurus’ suggests ontogenetic transformations in the taxon mirror phytosaurian morphological evolution

The Anatomical Record, EarlyView.
Abstract The study of morphological evolution is fundamentally tied to ontogeny, yet studies of these heterochronic processes in the fossil record are rare. Fossils belonging to an ontogenetic series are difficult to assign to an ontogenetic stage due to inconsistent proxies for skeletal ages, challenging to taxonomically assign due to morphological ...
Erika R. Goldsmith, Michelle R. Stocker
wiley   +1 more source

Endothermy, neuron counts, and other issues: Further remarks on neurocognitive evolution in fossil vertebrates

The Anatomical Record, EarlyView.
Abstract Last year, we challenged the view that large‐bodied theropod dinosaurs such as Tyrannosaurus rex resembled primates in cognition and behavior, a proposition made by Herculano‐Houzel in 2023. More recently, Jensen et al. have criticized our work on this topic, raising methodological and conceptual issues.
Kai R. Caspar, Cristián Gutiérrez‐Ibáñez, Hady George, Thomas R. Holtz Jr., Darren Naish, Grant R. Hurlburt   +5 more
wiley   +1 more source

Interannual Modulation of Northern Hemisphere Winter Storm Tracks by the QBO

Geophysical Research Letters, 2018
Storm tracks, defined as the preferred regions of extratropical synoptic‐scale disturbances, have remarkable impacts on global weather and climate systems.
Jiabao Wang, Hye‐Mi Kim, Edmund K. M. Chang   +2 more
doaj   +1 more source

Comparative cranial biomechanics reveal macroevolutionary trends in theropod dinosaurs, with emphasis on Tyrannosauroidea

The Anatomical Record, EarlyView.
Abstract Tyrannosaurus is viewed as a model organism in vertebrate paleontology, with numerous studies analyzing its feeding biomechanics. Nonetheless, the evolution of this feeding performance has been under‐addressed in Tyrannosauroidea, especially in basal tyrannosauroids. Here we used muscle‐force reconstruction and finite element analysis (FEA) to
Evan Johnson‐Ransom, Paul Gignac, Daniel E. Barta, Ryan N. Felice, Eric Snively   +4 more
wiley   +1 more source