We report on the theoretical determination of low-lying shape resonances in a selected set of seven molecules. The finite element discrete model method is used and the absolute differences between calculated and experimental values, where known, are ≲0.15 eV for the resonances lowest in energy. Difficulties expected with the higher calculated values are discussed. This article reports results for ortho-benzyne, benzene, naphthalene, anthracene, styrene, formamide, and acetamide. Comparisons are made with a few other calculations, again where available.
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http://dx.doi.org/10.1063/1.4819972 | DOI Listing |
Alzheimers Dement
December 2024
The Fourth People's Hospital of Chengdu, Chengdu, Sichuan, China.
Background: Apolipoproteins and cortical morphology are closely associated with memory complaints, and both may contribute to the development of Alzheimer's disease.
Method: A total of 97 patients from the University of Electronic Science and Technology (UESTC) (n=42) and the Fourth People's Hospital of Chengdu (FPHC) (n=55) were grouped based on recruitment location, and underwent neuropsychological tests. ApoB, ApoA1, ApoB/ApoA1, plasma Alzheimer's biomarker, apolipoprotein E (ApoE) genotyping, 3T magnetic resonance imaging.
Alzheimers Dement
December 2024
German Center for Neurodegenerative Diseases (DZNE), Magdeburg, Germany.
Background: Differences in task-fMRI activation have recently been found to be related to neuropathological hallmarks of AD. However, the evolution of fMRI-based activation throughout AD disease progression and its relationship with other biomarkers remains elusive. Applying a disease progression model (DPM) to a multicentric cohort with up to four annual task-fMRI visits, we hope to provide a deeper insight into these relationships.
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December 2024
Universidad de La Laguna, Santa Cruz de Tenerife, Spain.
Background: The brain undergoes structural changes during aging, such as gray matter loss, enlarged ventricles, and sulcal widening. However, previous studies have primarily investigated these changes in isolation, without describing the complex spatial relationships between overall brain shape and regions. Here, we tested how gradients of expansion and compression of the global shape of the brain as well as between homologous brain regions across hemispheres are affected by age, and whether these changes further contribute to clinical impairment and cognitive deficits in older adults.
View Article and Find Full Text PDFAlzheimers Dement
December 2024
Barcelonaβeta Brain Research Center (BBRC), Pasqual Maragall Foundation, Barcelona, Spain.
Background: The driving mechanisms of structural brain alterations in the earliest stages of Alzheimer's disease (AD) are not well understood. Previous heterogeneous findings in preclinical AD, including subtle atrophy and also increased grey matter (GM) volume, underscore the need for further exploration. This study uses an extensive fluid biomarkers panel to identify pathological drivers behind longitudinal GM changes in cognitively unimpaired (CU) adults.
View Article and Find Full Text PDFBackground: White Matter Hyperintensities (WMH) appear on T2-weighted Fluid-Attenuated Inversion Recovery (FLAIR) Magnetic Resonance Imaging (MRI) and are an important biomarker of cerebral small vessel disease (CSVD), cognitive decline, and stroke. However, manual delineation is laborious and bias-prone, while automated segmentation has proven challenging. With the recent conclusion of the MICCAI-Society WMH segmentation challenge, and our large clinical trials, "Risk Reduction for Alzheimer's Disease" (rrAD) and "Hypertension, Intracranial Pulsatility and Brain Amyloid-beta Clearance in older adults" (HIPAC), we investigated the differences in the total WMH volume segmented by various algorithms to ensure the extraction of accurate and meaningful image-derived phenotypes.
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