Cardiovascular risk burden, dementia risk and brain structural imaging markers:a study from UK Biobank

Background:Cardiovascular risk burden is associated with dementia risk and neurodegeneration-related brain structure, while the role of genetics and incident cardiovascular disease (CVD) remains unclear. Aims:To examine the association of overall cardiovascular risk burden with the risk of major dementia subtypes and volumes of related brain regions in a large sample, and to explore the role of genetics and CVD onset. Methods:A prospective study among 354 654 participants free of CVD and dementia (2006–2010, mean age 56.4 years) was conducted within the UK Biobank, with brain magnetic resonance imaging (MRI) measurement available for 15 104 participants since 2014. CVD risk burden was evaluated by the Framingham General Cardiovascular Risk Score (FGCRS). Dementia diagnosis was ascertained from inpatient and death register data. Results:Over a median 12.0-year follow-up, 3998 all-cause dementia cases were identified. Higher FGCRS was associated with increased all-cause dementia risk after adjusting for demographic, major lifestyle, clinical factors and the polygenic risk score (PRS) of Alzheimer’s disease. Comparing the high versus low tertile of FGCRS, the odds ratios (ORs) and 95% confidence intervals (CIs) were 1.26 (1.12 to 1.41) for all-cause dementia, 1.67 (1.33 to 2.09) for Alzheimer’s disease and 1.53 (1.07 to 2.16) for vascular dementia (all ptrend&lt;0.05). Incident stroke and coronary heart disease accounted for 14% (95% CI: 9% to 21%) of the association between FGCRS and all-cause dementia. Interactions were not detected for FGCRS and PRS on the risk of any dementia subtype. We observed an 83% (95% CI: 47% to 128%) higher all-cause dementia risk comparing the high–high versus low–low FGCRS–PRS category. For brain volumes, higher FGCRS was associated with greater log-transformed white matter hyperintensities, smaller cortical volume and smaller grey matter volume. Conclusions:Our findings suggest that the positive association of cardiovascular risk burden with dementia risk also applies to major dementia subtypes. The association of cardiovascular risk burden with all-cause dementia is largely independent of CVD onset and genetic predisposition to dementia.</p

Preparation and properties of Sr(CrMnFeCoNi)(3)O-4 and Sr (MgAlTiCrFe)(12)O-19 high entropy strontium ferrite systems and valance state analysis

Two high-entropy ferrite ceramic systems, Sr(CrMnFeCoNi)(12)O-19 and Sr(MgAlTiCrFe)(12)O-19, were designed according to AB(12)O(19) composition and synthesised using elevated-temperature solid phase reaction. The B-site was loaded with five atoms in equal proportions. We focused on preparing high-entropy hexagonal magnetoplumbite strontium ferrites. However, spinel structure significantly formed in the Sr(CrMnFeCoNi)(12)O-19 system. The extruded strontium outside the lattice pulled out a part of chromium, causing phase separation and element segregation. The strontium extrusion outside the lattice and non-formation of hexagonal ferrite, which was reported for the first time, could be attributed to the electrovalence change in the elements. First-principles calculation of the (CrMnFeCoNi)(3)O-4 spinel system was used to analyse the band structure and density state. After entropy engineering design, it was mutated into a wide direct band gap (2.3 eV at 0 K). Although the nonmagnetic elements reduced the magnetic performance, they significantly improved the mechanical performance with a flexural strength of 208.7 +/- 0.9 MPa. These results may contribute to the element selection and preparation of high-entropy strontium ferrites

Preparation and properties of Sr(CrMnFeCoNi)(3)O-4 and Sr (MgAlTiCrFe)(12)O-19 high entropy strontium ferrite systems and valance state analysis

Two high-entropy ferrite ceramic systems, Sr(CrMnFeCoNi)(12)O-19 and Sr(MgAlTiCrFe)(12)O-19, were designed according to AB(12)O(19) composition and synthesised using elevated-temperature solid phase reaction. The B-site was loaded with five atoms in equal proportions. We focused on preparing high-entropy hexagonal magnetoplumbite strontium ferrites. However, spinel structure significantly formed in the Sr(CrMnFeCoNi)(12)O-19 system. The extruded strontium outside the lattice pulled out a part of chromium, causing phase separation and element segregation. The strontium extrusion outside the lattice and non-formation of hexagonal ferrite, which was reported for the first time, could be attributed to the electrovalence change in the elements. First-principles calculation of the (CrMnFeCoNi)(3)O-4 spinel system was used to analyse the band structure and density state. After entropy engineering design, it was mutated into a wide direct band gap (2.3 eV at 0 K). Although the nonmagnetic elements reduced the magnetic performance, they significantly improved the mechanical performance with a flexural strength of 208.7 +/- 0.9 MPa. These results may contribute to the element selection and preparation of high-entropy strontium ferrites