The age at natural menopause of Chinese Han and Tibetan women.

Background: Studies have reported that the age at natural menopause may vary between different ethnic groups. Chinese Han and Tibetan women exhibit substantial differences in their living environment, dietary habits, and lifestyle; however, few studies have specifically investigated the potential differences in their age at natural menopause. This study was designed to identify the discrepancy in the age at natural menopause between postmenopausal women of Chinese Han and Tibetan ethnicities.

The impact of inoculation with the inactivated COVID-19 vaccine on the outcomes of fertilization and embryo transfer: a cohort study of 1,258 women from Sichuan, China.

Objective: This study aimed to assess the impact of inoculation with the inactivated coronavirus disease 2019 (COVID-19) vaccine on the outcomes of fertilization and embryo transfer (IVF-ET).

Methods: From January 2021 to December 2022, patients undergoing their first cycle of IVF-ET at the Reproductive Medicine Center of Sichuan Provincial Women's and Children's Hospital were prospectively enrolled. Based on inoculation with inactivated COVID-19 vaccines before ovarian stimulation (OS) by a gonadotrophin-releasing hormone (GnRH) antagonist or agonist protocol, the patients were divided into the vaccinated group ( = 713) and the unvaccinated group ( = 545).

Comparison of aneuploidy for patients of different ages treated with progestin-primed ovarian stimulation or GnRH antagonist protocols.

Research Question: Does euploidy status differ among patients of different ages treated with progestin-primed ovarian stimulation (PPOS) or gonadotrophin releasing hormone antagonist (GnRH-a) protocols?

Design: Patients undergoing PGT-A (n = 418; 440 cycles) were enrolled and grouped according to female age (<35 years and ≥35 years). Protocols were as follows: PPOS: <35 years (n = 131; 137 cycles); ≥35 years (n = 72; 80 cycles); GnRH-a: <35 years (n = 149; 152 cycles); ≥35 years (n = 66; 71 cycles).

Results: For cycles treated with PPOS in the older group, rates of euploid blastocyst per metaphase Ⅱ oocyte (15.

Graphitic carbon nitride supported Ni-Co dual-atom catalysts beyond Ni(Co) single-atom catalysts for hydrogen production: a density functional theory study.

Using density functional theory calculations we investigate the formation, structure and electronic properties of gh-CN-supported Ni-Co (Ni-Co/gh-CN) dual-atom catalysts and Ni(Co) single-metal catalysts, as a paradigmatic example of single-atom few-atom catalysts. An inverted mold assumption is proposed to identify the factors determining the number, shape and packing manner of metal atoms inside the pores of gh-CN. The area matching between virtual fragments and metal fillers and lattice inheritance from N coordination and metal aggregates allow for a stable Ni-Co/gh-CN, which would possess more active sites and a more complex structure-activity relation than single-atom doping.

Decreased GDF9 and BMP15 in follicle fluid and granulosa cells and outcomes of IVF-ET among young patients with low prognosis.

Purpose: To analyze the level of growth differentiation factor 9 (GDF9) and bone morphogenetic protein 15 (BMP15) in follicle fluid (FF) and granulosa cells (GCs) derived from young patients with low prognosis for in vitro fertilization and embryo transfer (IVF-ET) treatment.

Methods: A prospective cohort study was carried out by enrolling 52 young patients with low prognosis according to the POSEIDON classification group 3 (low prognosis group) and 51 young patients with normal ovarian reserve (control group). The concentration of the GDF9 and BMP15 proteins in FF was determined by enzyme-linked immunosorbent assay.