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- Jonsson, Sara, et al.
(författare)
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Time to childbirth and assisted reproductive treatment in women with congenital heart disease
- 2024
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Ingår i: OPEN HEART. - : BMJ Publishing Group Ltd. - 2053-3624 .- 2398-595X. ; 11:1
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Tidskriftsartikel (refereegranskat)abstract
- Objective To investigate the time to first childbirth and to compare the prevalence of assisted reproductive treatment (ART) in women with congenital heart disease (CHD) compared with women without CHD. Methods All women in the national register for CHD who had a registered first childbirth in the Swedish Pregnancy Register between 2014 and 2019 were identified. These individuals (cases) were matched by birth year and municipality to women without CHD (controls) in a 1:5 ratio. The time from the 18th birthday to the first childbirth and the prevalence of ART was compared between cases and controls. Results 830 first childbirths in cases were identified and compared with 4137 controls. Cases were slightly older at the time for first childbirth (28.9 vs 28.5 years, p=0.04) and ART was more common (6.1% vs 4.0%, p<0.01) compared with controls. There were no differences in ART when stratifying for the complexity of CHD. For all women, higher age was associated with ART treatment (OR 1.24, 95% CI 1.20 to 1.28). Conclusions Women with and without CHD who gave birth to a first child did so at similar ages. ART was more common in women with CHD, but disease severity did not influence the need for ART. Age was an important risk factor for ART also in women with CHD and should be considered in consultations with these patients.
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- Pazniak, Hanna, et al.
(författare)
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Phase Stability of Nanolaminated Epitaxial (Cr1-xFex)(2)AlC MAX Phase Thin Films on MgO(111) and Al2O3 (0001) for Use as Conductive Coatings
- 2021
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Ingår i: ACS Applied Nano Materials. - : AMER CHEMICAL SOC. - 2574-0970. ; 4:12, s. 13761-13770
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Tidskriftsartikel (refereegranskat)abstract
- In this study, we model the chemical stability in the (Cr1-xFex)(2)AlC MAX phase system using density functional theory, predicting its phase stability for 0 < x < 0.2. Following the calculations, we have successfully synthesized nanolaminated (Cr1-xFex)(2)AlC MAX phase thin films with target Fe contents of x = 0.1 and x = 0.2 by pulsed laser deposition using elemental targets on MgO(111) and Al2O3 (0001) substrates at 600 degrees C. Structural investigations by X-ray diffraction and transmission electron microscopy reveal MAX phase epitaxial Iilms on both substrates with a coexisting (Fe,Cr)(5)Al-8 intermetallic secondary phase. Experiments suggest an actual maximum Fe solubility of 3.4 at %, corresponding to (Cr0.932Fe0.068)(2)AlC, which is the highest Fe doping level achieved so far in volume materials and thin films. Residual Fe is continuously distributed in the (Fe,Cr)(5)Al-8 intermetallic secondary phase. The incorporation of Fe results in the slight reduction of the c lattice parameter, while the a lattice parameter remains unchanged. The nanolaminated (Cr0.932Fe0.068)(2)AlC thin films show a metallic behavior and can serve as promising candidates for highly conductive coatings.
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- Tao, Quanzheng, et al.
(författare)
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Synthesis, Characterization, and Modeling of a Chemically Ordered Quaternary Boride, Mo4MnSiB2
- 2023
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Ingår i: Crystal Growth & Design. - : AMER CHEMICAL SOC. - 1528-7483 .- 1528-7505. ; 23:5, s. 3258-3263
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Tidskriftsartikel (refereegranskat)abstract
- The recent discovery of chemical ordering in quaternary borides offers new ways of exploring properties and functionalities of these laminated phases. Here, we have synthesized and investigated chemical ordering of the laminated Mo4MnSiB2 (T2) phase, thereby introducing a magnetic element into the family of materials coined o-MAB phases. By X-ray diffraction and scanning transmission electron microscopy, we provide evidence for out-of-plane chemical ordering of Mo and Mn, with Mo occupying the 16l site and Mn preferentially residing in the 4c site. Mn and B constitute quasi-two-dimensional layers in the laminated material. We have therefore also studied the magnetic properties by magnetometry, and no sign of long-range magnetic order is observed. An initial assessment of the magnetic ordering has been further studied by density functional theory (DFT) calculations, and while we find an antiferromagnetic configuration to be the most stable one, ferromagnetic ordering is very close in energy.
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