Matthew Johnson results 343
· Newest (Page 1/14, per page 25)
Author: Matthew Johnson ×Clear All Filters
Search Results
Parasites play a critical yet understudied role in Arctic ecosystems, particularly within key subsistence species such as Arctic char ( Salvelinus alpinus ). As the Arctic undergoes rapid climate-driven change, establishing baseline parasite biodiversity is essential for monitoring ecological shifts and anticipating emerging health and conservation concerns. This study provides the most comprehensive assessment to date of Arct...
Probing the influence of PsbS on thylakoid lipid fluidityNARA Subscribed
Due to fluctuations in sunlight intensity, balancing light-harvesting efficiency and photoprotection is critical for plant fitness. To achieve this balance, plants have evolved a highly regulated mechanism, non-photochemical quenching (NPQ), which is activated under excess light to dissipate absorbed energy and deactivated under low light to preserve photosynthetic efficiency. A key component that allows NPQ to respond rapidly...
Optimizing a Hematology/Oncology Curriculum for Internal Medicine Residents: A Two-Institution Modified Delphi StudyNARA Subscribed
Purpose. Although hematology/oncology (H/O) topics are essential for clinicians, many internal medicine (IM) residents perceive inadequate H/O education. This perception may be due to the lack of a standardized H/O curriculum. To address this gap, we aimed to achieve consensus about the most important H/O topics for IM residents to learn. Methods. In 2023, we conducted a 2-round modified Delphi study of IM generalists and H/O...
Taking Genomics Outdoors: Linking Local Adaptation, Trait Variation and Gene Expression in Grass Ecotypes Across a Rainfall GradientNARA Subscribed
With increasing droughts, understanding local adaptation and drought tolerance in ecologically dominant species is crucial for enhancing ecosystem resilience. We leveraged a long‐term reciprocal garden to assess local adaptation and drought responses in Andropogon gerardi , a foundation grassland species in the US Great Plains. Our objectives were to identify adaptive traits, explore gene expression responses across a rainfall...
Ecosystem metabolism (e.g., gross primary production [GPP], respiration [R], and net ecosystem production) integrates the activity of aerobic organisms and is an indicator of environmental change. Microplastics (i.e., particles 1–5 mm) are widespread in freshwater ecosystems and are colonized by biofilms and other organisms. However, microplastics' effects on ecosystem‐level processes including metabolism or other gas fluxes i...
Diversity and functional group composition drive biogeographic patterns in marine biogenic structural complexityNARA Subscribed
Biogenic structural complexity is a key driver of biodiversity and ecosystem functioning, yet its ecological and environmental determinants remain poorly understood across broad biogeographic scales. Here, we conducted standardized 90‐day field experiments at 16 coastal sites, spanning a 41‐degree latitudinal gradient, using naturally assembled marine fouling communities on settlement panels. We measured rugosity as our metric...
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...