David Wright results 241
· Newest (Page 1/10, per page 25)
Author: David Wright ×Clear All Filters
Search Results
Comparing phosphatised galleried stereom of Ordovician Cincinnaticrinus to modern Endoxocrinus illustrates preservation by micromoldingNARA Subscribed
Fossil echinoderm ossicles are often occluded by syntaxial overgrowths which obscure stereom. Phosphatized ossicles from insoluble residues show fine microstructure. We investigated phosphatized stereom in Cincinnaticrinus columnals in insoluble residues from the Ordovician around Cincinnati, Ohio USA. Microstructures appeared to be stereom micromolds. We tested this hypothesis by examining residue and thin sections of undisso...
Speciation of European bullheads ( Cottus spp.): The next problem for taxonomy of northern freshwater fishesNARA Subscribed
High morphological and ecological diversity displayed by European bullheads led Freyhof et al. (2005) to describe 15 nominal species. However, the basis for declaring these nominal species is contentious due to a lack of rigorous statistical analysis of morphological variations among populations, limitations in the inferences made from previous generations of molecular studies, a dearth of next‐generation sequencing tools for...
Daytime sleep following observational practice does not enhance a visual-spatial and a motor representationNARA Subscribed
The present study examined if a daytime nap of 90 min can further improve skill memory afforded by observation and physical practice. Moreover, we determined if a ‘nap’ benefit was restricted to a particular representational form (spatial or motor) that can be used to govern performance. Participants were assigned to one of four experimental conditions: physical practice with no nap, physical practice with a nap, observation w...
Fine‐Scale Ecological Biomonitoring in a Large, Complex Agriculturally Impacted Watershed via eDNA MetabarcodingNARA Subscribed
DNA‐based approaches utilizing high‐throughput sequencing (HTS) (e.g., DNA metabarcoding) have revolutionized ecological biomonitoring by providing higher sample throughput, greater reproducibility, and better cost‐benefits compared to traditional morphology‐based bioassessment studies. Here, we utilized DNA metabarcoding in a watershed in Ontario (Canada) dominated by agricultural land uses. Our aim is to understand patterns...
Interpretable deep learning reveals spatiotemporal MRI features of brain aging that align with neurodegenerationNARA Subscribed
Cortical thinning and atrophy are hallmarks of brain aging that have been characterized using magnetic resonance imaging (MRI). Brain aging involves many neuroanatomic features whose effects on brain structure remain unexplored. To address this challenge, we trained interpretable deep neural networks (DNNs) to estimate brain age (BA) from T 1 -weighted ( T 1 w) MRI. By identifying MRI features unapparent to humans, DNNs can fi...
Alzheimer’s disease (AD) disproportionately affects women and carriers of the apolipoprotein E ε4 allele (APOE4), yet little is known about how sex and APOE interact to influence white matter (WM) integrity during disease progression. We integrated diffusion MRI and matched blood transcriptomic data to investigate these interactions and their underlying biological mechanisms. WM microstructure was quantified using diffusion te...
Your brain doesn’t look a day past 70! Cross-sectional associations with brain-predicted age in the cognitively-intact oldest-oldNARA Subscribed
The cognitively-intact oldest-old (85 +) may be the most-resilient members of their birth cohort; due to survivorship effects (e.g., depletion of susceptibles), risk factors associated with brain aging biomarkers in younger samples may not generalize to the cognitively-intact oldest-old. We evaluated associations between established aging-related risk factors and brain-predicted age difference (brainPAD) in a cross-sectional c...
Hydrogeology, European colonialism, local communities and First Peoples: moving beyond business as usualNARA Subscribed
European colonialism altered the connections between First Peoples, local communities, and groundwater systems across the world. In many countries, the practice of hydrogeology remains intertwined with the economic agendas of colonial settler communities, making colonialism a useful lens through which to consider our work. This paper briefly summarizes connections between First Peoples, local communities and groundwater, as we...
Mapping Plant Functional Traits Using Gap‐Filled Datasets to Inform Management and ModellingNARA Subscribed
Aim Plant traits are used to describe the functional properties of vegetation that are critical to terrestrial ecosystem services. Functional trait metrics for plant communities can be valuable for modelling important ecosystem properties such as fuel loads and nutrient cycling, future plant diversity and responses to global change. However, the vast scale of plant diversity means collecting trait and distribution data for all...