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A novel quasi-one-dimensional topological insulator in bismuth iodide β-Bi<sub>4</sub>I<sub>4</sub>
Autè,s, Gabriel,Isaeva, Anna,Moreschini, Luca,Johannsen, Jens C.,Pisoni, Andrea,Mori, Ryo,Zhang, Wentao,Filatova, Taisia G.,Kuznetsov, Alexey N.,Forró,, Lá,szló,Van den Broek, Nature Publishing Group, a division of Macmillan P 2016 NATURE MATERIALS Vol.15 No.2
Recent progress in the field of topological states of matter has largely been initiated by the discovery of bismuth and antimony chalcogenide bulk topological insulators (TIs; refs ,,,), followed by closely related ternary compounds and predictions of several weak TIs (refs ,,). However, both the conceptual richness of Z<SUB>2</SUB> classification of TIs as well as their structural and compositional diversity are far from being fully exploited. Here, a new Z<SUB>2</SUB> topological insulator is theoretically predicted and experimentally confirmed in the β-phase of quasi-one-dimensional bismuth iodide Bi<SUB>4</SUB>I<SUB>4</SUB>. The electronic structure of β-Bi<SUB>4</SUB>I<SUB>4</SUB>, characterized by Z<SUB>2</SUB> invariants (1;110), is in proximity of both the weak TI phase (0;001) and the trivial insulator phase (0;000). Our angle-resolved photoemission spectroscopy measurements performed on the (001) surface reveal a highly anisotropic band-crossing feature located at the point of the surface Brillouin zone and showing no dispersion with the photon energy, thus being fully consistent with the theoretical prediction.
Combined Predictors of Long-Term Outcomes of Kasai Surgery in Infants with Biliary Atresia
Anna Degtyareva,Medan Isaeva,Elena Tumanova,Elena Filippova,Anna Sugak,Alexander Razumovsky,Nadezhda Kulikova,Marina Albegova,Denis Rebrikov 대한소아소화기영양학회 2024 Pediatric gastroenterology, hepatology & nutrition Vol.27 No.4
Purpose: Biliary atresia (BA) is the leading cause of neonatal cholestasis (25–45%). The primary treatment is hepatic portoenterostomy (Kasai procedure), but only 20–40% provide long-term benefits. This study aimed to develop a predictive model for surgical efficacy by comparing preoperative and early postoperative indicators in infants with different outcomes. Methods: We enrolled 166 infants with BA (93 girls, 73 boys) who underwent the Kasai procedure between September 2002 and December 2021, dividing them into favorable or adverse outcome groups. Over 40 parameters were measured, and the diagnostic significance of the prognostic model was evaluated. Results: Kasai surgery was efficacious in 69 patients (42%) and non-efficacious in 97 (58%). Our model assesses efficacy by day 14 after surgery, improving on the <34 μmol/L direct bilirubin threshold established for 3–6 months after the procedure. Including the Desmet fibrosis score refined the model. Conclusion: Blood cholesterol below 5.41 mmol/L, direct bilirubin below 56.3 μmol/L on postoperative days 14±3, and a low Desmet score indicate a high probability of efficacious Kasai surgery in infants with BA.
Leila Adamyan,Laura Pivazyan,Lilia Obosyan,Ekaterina Krylova,Sapiyat Isaeva 대한산부인과학회 2024 Obstetrics & Gynecology Science Vol.67 No.4
This study aimed to summarize the current knowledge on the benefits of in vitro fertilization/intracytoplasmic sperm injection with preimplantation genetic testing for aneuploidy (PGT-A) and to discuss the role of PGT-A in patients of different ages undergoing assisted reproduction. A systematic review was conducted in accordance with the Preferred Reporting Items for Systematic Reviews and Meta-Analyses 2020 checklist. Registration number: CRD42022354697. Studies were identified by searching the PubMed, Cochrane Library, Google Scholar, Scopus, Embase, and ClinicalTrials databases. Seven meta-analyses were performed with additional stratification of age and prognosis of the women studied. Clinical pregnancy rate per embryo transfer in patients aged >35 years was higher in the PGT-A group (P=0.0002) than in controls. Live birth rate (LBR) per embryo transfer in women 35 years old or younger (P=0.002) was higher in the PGT-A group. The LBR per patient in women aged >35 years was higher in the PGT-A group (P=0.004). The effects of PGT-A on LBR in patients with poor prognosis showed a statistically significant increase (P=0.003). There was no significant difference in the rate between the two groups. PGT-A is effective and can be recommended for patients aged >35 years undergoing assisted reproduction to improve their reproductive outcomes. Moreover, our study showed the possible benefits of PGT-A in patients with a poor prognosis. Overall, our findings suggest that PGT-A is a valuable tool for improving the reproductive outcomes of assisted reproductive procedures in older women and those with a history of pregnancy complications.