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North American bird declines are greatest where species are most abundant

3 months ago
Science, Volume 388, Issue 6746, Page 532-537, May 2025.
Alison Johnston, Amanda D. Rodewald, Matt Strimas-Mackey, Tom Auer, Wesley M. Hochachka, Andrew N. Stillman, Courtney L. Davis, Viviana Ruiz-Gutierrez, Adriaan M. Dokter, Eliot T. Miller, Orin Robinson, Shawn Ligocki, Lauren Oldham Jaromczyk, Cynthia…

Divergent actions of physiological and pathological amyloid-β on synapses in live human brain slice cultures

3 months ago
In Alzheimer's disease, amyloid beta (Aβ) and tau pathology are thought to drive synapse loss. However, there is limited information on how endogenous levels of tau, Aβ and other biomarkers relate to patient characteristics, or how manipulating physiological levels of Aβ impacts synapses in living adult human brain. Using live human brain slice cultures, we report that Aβ(1-40) and tau release levels vary with donor age and brain region, respectively. Release of other biomarkers such as KLK-6,...
Robert I McGeachan

Ethnicity and frailty: A systematic review of association with prevalence, incidence, trajectories and risks

3 months ago
CONCLUSION: Ethnic disparities in frailty prevalence persist across community-based settings in different countries and are not fully explained by known inequalities. Addressing these disparities will likely require careful frailty measurement and assessment; confronting structural inequalities; and tailoring interventions to the needs of minoritised populations.
Maryam Khan

High-entropy sulfoselenide as negative electrodes with fast kinetics and high stability for sodium-ion batteries

3 months ago
Conversion electrodes offer higher reversible capacity and lower cost than conventional intercalation chemistry electrodes, but suffer from kinetic limitation and large volume expansion. Despite significant efforts, developing conversion electrodes with fast charging capability and extended lifespan remains challenging. Here, by leveraging the advantages of high-entropy doping and morphology tailoring, we develop a high-entropy hierarchical micro/nanostructured sulfoselenide...
Shengfeng Zhang

KLRG1 identifies regulatory T cells with mitochondrial alterations that accumulate with aging

3 months ago
Recent studies using single-cell RNA sequencing technology have uncovered several subpopulations of CD4^(+) T cells that accumulate with aging. These age-associated T cells are emerging as relevant players in the onset of inflammaging and tissue senescence. Here, based on information provided by single-cell RNA sequencing data, we present a flow cytometry panel that allows the identification of age-associated T cell subsets in systematic larger analysis in mice. We use this panel to evaluate at...
Gonzalo Soto-Heredero

The distribution of subsurface microplastics in the ocean

3 months ago
Marine plastic pollution is a global issue, with microplastics (1 µm-5 mm) dominating the measured plastic count^(1,2). Although microplastics can be found throughout the oceanic water column^(3,4), most studies collect microplastics from surface waters (less than about 50-cm depth) using net tows⁵. Consequently, our understanding of the microplastics distribution across ocean depths is more limited. Here we synthesize depth-profile data from 1,885 stations collected between 2014 and 2024 to...
Shiye Zhao