First-principles study on energetic cocrystals of CL-20/4,5-MDNI with two different stoichiometric ratios under high pressure.

Context: This research determined the crystal structure, molecular structure, electronic structure, optical properties, mechanical properties, and Hirshfeld analysis of the CL-20/4,5-MDNI cocrystal at two distinct stoichiometric ratios under hydrostatic pressures varying from 0 to 100 GPa. The findings revealed that the CL-20/4,5-MDNI cocrystal with a 1:1 ratio experienced two structural transitions at pressures of 80 GPa and 90 GPa. Notably, new covalent bonds, C10-O13 and C9-O14, were established, whereas the C10-H10C bond was disrupted.

[Analysis of the treatment of a premature infant with critical coronavirus disease caused by the Omicron variant of SARS-CoV-2].

The patient is a female infant who was born at a gestational age of 30 weeks in the breech position and was delivered by assisted vaginal delivery. She was admitted to the neonatal department of Tianjin First Central Hospital for 44 days, during which she had stable respiration, oxygen saturation, and regular weight gain. The patient was discharged home by her family.

[Change in serum IgG antibody during the recovery stage of Omicron variant infection in children: an analysis of 110 cases].

Objectives: To investigate the serum level of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2)-specific RBD IgG antibody (SARS-CoV-2 IgG antibody for short) in children with SARS-CoV-2 Omicron variant infection during the recovery stage, as well as the protective effect of SARS-CoV-2 vaccination against Omicron infection.

Methods: A retrospective analysis was performed on 110 children who were diagnosed with coronavirus disease 2019 (COVID-19) caused by SARS-CoV-2 Omicron variant infection in Tianjin of China from January 8 to February 7, 2022. According to the status of vaccination before diagnosis, they were divided into a booster vaccination (3 doses) group with 2 children, a complete vaccination (2 doses) group with 90 children, an incomplete vaccination (1 dose) group with 5 children, and a non-vaccination group with 13 children.