Publications by authors named "K Hayden"
Article Synopsis
- Dry deposition plays a significant role in removing reactive organic carbon from the atmosphere, impacting airborne chemical reactions and transferring this carbon to other environmental systems.
- Using aircraft measurements, researchers found that oil operations can lead to high deposition rates of organic carbon, reaching up to 100 tons per hour, with rapid lifetimes of about 4 hours that can compete with oxidation processes.
- Traditional models for gas-phase deposition may not capture all deposited organic carbon, indicating a need to consider these deposition processes in assessing the effects on freshwater ecosystems, as they contribute significantly to the overall carbon balance compared to terrestrial sources.
Background: Prior longitudinal studies among older adults have documented associations between hearing loss and changes in brain morphology. Whether interventions involving hearing aids can reduce age-related atrophy is unknown. A substudy within the Aging and Cognitive Health Evaluation in Elders (ACHIEVE, Clinicaltrials.
View Article and Find Full Text PDFImportance: Metals are established neurotoxicants, but evidence of their association with cognitive performance at low chronic exposure levels is limited.
Objective: To investigate the association of urinary metal levels, individually and as a mixture, with cognitive tests and dementia diagnosis, including effect modification by apolipoprotein ε4 allele (APOE4).
Design, Setting, And Participants: The multicenter prospective cohort Multi-Ethnic Study of Atherosclerosis (MESA) was started from July 2000 to August 2002, with follow-up through 2018.
Introduction: Growing interest centers on the association between circulating ketone bodies (KB) and cognitive function, notably in aging and neurodegenerative diseases.
Methods: Associations of plasma KB with incident dementia and cognitive performances were examined among Multi-Ethnic Study of Atherosclerosis (MESA) participants. KB were measured using plasma samples collected following an overnight fasting at Exam 1 (2000-02) and detailed cognitive testing at Exam 5 (2010-2012, = 4392), Exam 6 (2016-2018, = 1838), and in MESA-MIND (2019-2021, = 2060).
Importance: Health-related quality of life is a critical health outcome and a clinically important patient-reported outcome in clinical trials. Hearing loss is associated with poorer health-related quality-of-life in older adults.
Objective: To investigate the 3-year outcomes of hearing intervention vs health education control on health-related quality of life.