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E122Q rhodopsin: pigment microspectrophotometry, photoreceptor light responses, and bleaching adaptationNARA Subscribed
When the rhodopsin visual pigment of vertebrate rods absorbs light, photoisomerization of its 11- cis retinal chromophore to all-trans retinal triggers a conformational change, ultimately leading to the formation of metarhodopsin II (meta II), the active signalling state. Meta II initiates the phototransduction cascade, culminating in membrane hyperpolarization. To investigate how meta II lifetime shapes the rod photoresponse,...
The aetiology of frailty remains unknown. It has been hypothesised that individual differences in epigenetic mechanisms, particularly DNA methylation (DNAm), may help to explain why some individuals become frail while others do not. Relating epigenetic measures to transitions in age-related frailty in individual patients requires longitudinal studies over many years. To overcome this barrier, we study associations between DNAm...
Rationale The impact of cannabis use patterns on pain perception during abstinence remains unclear. Objectives This study examined whether cannabis use frequency and weekly delta-9-tetrahydrocannabinol (THC) exposure are associated with pain perception and circulating cannabinoid levels during biochemically verified brief abstinence. Methods Healthy adults ( N = 75; 29 females, 46 males; ages 21–55) reporting past-month cannab...
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...
Logging intensity alters tree species composition and wood density, but not tree diversity, in lowland forests in VietnamNARA Subscribed
Tropical forests host considerable biodiversity but face degradation from timber extraction (“logging”). We examined how logging intensity affected tree diversity, species composition, community wood density and availability of timber species in a lowland forest in north-central Vietnam. We measured and identified trees in 18 quarter-hectare plots that vary in historical logging intensity. Tree diversity showed no significant...
Patient Advocate–Trainee Engagement in Oncology Education: Insights from a Short Pilot SurveyNARA Subscribed
Patient advocates represent the voice of the patient community and bring a unique perspective to research. We hypothesized that including patient advocates in research training would increase trainees ability to communicate their science, understand the impact of their work and increase their empathy for patients. An IRB-approved survey was administered to assess the impact of patient advocate feedback on trainees who presente...
Soil property controls on plasticiser, antioxidant and UV absorber additive degradation across a global soil gradientNARA Subscribed
Additives in agricultural plastics can leach into the surrounding soil during use or improper disposal. Their subsequent degradation rates directly regulate whether they persist and accumulate to levels with ecotoxicological effects or are rendered benign. However, which soil properties primarily regulate the degradation of additives remains unclear (e.g. soil carbon, pH, available nutrients, microbial biomass and community st...
Barth syndrome (BTHS) is an X-linked recessive disorder characterized by cardiomyopathy, skeletal muscle myopathy and fatigue, growth restriction, and neutropenia. Neutropenia increases the risk of life-threatening bacterial infections, a major cause of death in individuals with BTHS. Currently, there is no curative treatment for BTHS or associated neutropenia. The development of therapeutic strategies to correct BTHS-associat...