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Scleroglossum stellatum and S. thailandicum (Polypodiaceae), Two New Grammitid Ferns From AsiaNARA Subscribed
Based on morphological and phylogenetic evidence, two new grammitid fern species (Polypodiaceae), Scleroglossum stellatum T.C. Hsu & Z.X. Chang and S. thailandicum T.C. Hsu & P. Limpanasittichai, are described. Scleroglossum stellatum was previously misidentified as S. sulcatum but can be distinguished by the presence of branched laminar hairs with 1–10 setiferous branches. Materials of S. thailandicum were previously misident...
A New Species of Arthropteris From SamoaNARA Subscribed
A new species, Arthropteris samoensis (Arthropteridaceae), recorded from the Samoan islands of Upolu and Savai‘i, is described and illustrated. In Samoa, the new species is distinguished from Arthropteris palisotii s.l. by its smaller stature and more delicate texture (laminae mostly 4 cm wide); fronds monomorphic with all pinnae distinctly lobed (vs. weakly dimorphic, sterile pinnae with subentire margins and fertile pinnae a...
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...
Alzheimer’s disease (AD) is the most common neurodegenerative disorder of the central nervous system, characterized by memory loss and cognitive decline. The two main hypotheses regarding AD involve the accumulation of amyloid-β (Aβ) forming plaques and the intracellular hyperphosphorylation of tau protein, leading to the formation of neurofibrillary tangles (NFT). These processes are accompanied by neuroinflammation and oxida...