Publications by authors named "J N Kenyon"
Introduction: The ActiGraph (AG) accelerometer is widely used to assess physical activity (PA) in heart failure (HF) patients. However, the validity of the AG in this population remains unexplored.
Objective: Therefore, this study examined the criterion validity of the AG-GT9X for measuring step counts (SC) and energy expenditure (EE) among HF patients.
Rationalizing the role of chemical interactions in the precursor solutions on the structure, morphology, and performance of thin-film CuZnSn(S,Se) (CZTSSe) is key for the development of bifacial and other photovoltaic (PV) device architectures designed by scalable solution-based methods. In this study, we uncover the impact of dimethylformamide (DMF) and isopropanol (IPA) solvent mixtures on cation complexation and rheology of the precursor solution, as well as the corresponding morphology, composition, and PV performance of CZTSSe thin-film grown on fluorine-doped tin oxide (FTO). We find that increasing the proportion of IPA leads to a nonlinear increase in dynamic viscosity due to the strong repulsion between DMF and IPA, which is characterized by an interaction cohesion parameter of 3.
View Article and Find Full Text PDFStructure of the K58 capsular polysaccharide produced by Acinetobacter baumannii isolate MRSN 31468 includes Pse5Ac7Ac that is 4-O-acetylated by a phage-encoded acetyltransferase.
Carbohydr Res
January 2025
Article Synopsis
- Capsular polysaccharide (CPS) from the bacterial pathogen Acinetobacter baumannii is a key factor in its virulence, specifically the KL58 variant produced by the strain MRSN 31468.
- The CPS structure is characterized as a branched tetrasaccharide containing various sugar units, including glucose, galactose, N-acetyl-galactosamine, and a unique acid, indicating complex biosynthesis processes.
- The study identified specific genes responsible for synthesizing components of CPS, noting that an acetyltransferase linked to a prophage may influence its structural modifications, while a related CPS variant contains a different epimer not present in MRSN 31468.
Article Synopsis
- - The study investigated the relationship between rest-activity rhythms (RAR) and frailty in older adults, analyzing data from 2,531 participants aged 60 and above, while also considering differences by sex.
- - Results indicated that frail and pre-frail individuals showed poorer RAR metrics, such as lower relative amplitude and higher variability, particularly highlighting a stronger association in females compared to males.
- - The findings suggest that diminished RAR strength is linked to increased frailty, especially in women, indicating that monitoring RAR could be useful for assessing frailty, but more research is needed to explore this connection over time.
Article Synopsis
- This study compares sleep-wake patterns in patients with primary brain tumors using a subjective measure (Consensus Sleep Diary) and an objective measure (ActiGraph actigraphy) over 14 nights among 30 participants.
- While some sleep-wake time parameters showed equivalency in results, many sleep disruptions and general sleep quality showed significant differences and low correlation between the two methods.
- The researchers concluded that using both subjective and objective sleep measures gives a more accurate picture of sleep health in these patients.