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  1. Abstract Background

    Myomectomy is the preferred treatment for women with uterine fibroids and fertility requirements. There are three modalities are used in clinical practice for myomectomy: abdominal myomectomy (AM), laparoscopic myomectomy (LM), and robot‐assisted laparoscopic myomectomy (RLM).

    Objectives

    To compare the perioperative and postoperative outcomes of RLM, AM, and LM.

    Search Strategy

    We searched PubMed, Web of Science, Embase, and Clinical Trials for relevant literature published between January 2000 and January 2023.

    Selection Criteria

    We included all studies reporting peri‐ and postoperative outcomes of myomectomy in patients with uterine myomas. Surgical treatments were classified as RLM, LM, or AM.

    Data Collection and Analysis

    Two or more authors selected studies independently, assessed risk of bias, and extracted data. We derived mean difference (MD) or odds ratio (OR) with 95% confidence intervals (CIs) for each outcome, subgrouping trials by the patient characteristics and myoma characteristics. We used theI2statistic to quantify heterogeneity and the random‐effects model for meta‐analysis when appropriate. We used the funnel plot to assess the publication bias.

    Main Results

    A total of 32 studies with 6357 patients were included, of which 1982 women had undergone RLM. The operating time was significantly longer (MD = 43.58, 95% confidence interval [CI]: 25.22–61.93,P < 0.001), and the incidence of cesarean section after myomectomy was significantly lower (OR = 0.27, 95% CI: 0.10–0.78,P = 0.02) in RLM than in LM. Compared with AM, the operation time, blood loss, blood transfusion rate, complication rate, total cost, length of hospital stay, and pregnancy rate of patients with RLM were significantly different.

    Conclusions

    The safety and effectiveness of RLM are superior to those of AM but inferior to those of LM.

     
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  2. Abstract The Born–Oppenheimer approximation is the keystone of modern computational chemistry and there is wide interest in understanding under what conditions it remains valid. Hydrogen atom scattering from insulator, semi-metal and metal surfaces has helped provide such information. The approximation is adequate for insulators and for metals it fails, but not severely. Here we present hydrogen atom scattering from a semiconductor surface: Ge(111) c (2 × 8). Experiments show bimodal energy-loss distributions revealing two channels. Molecular dynamics trajectories within the Born–Oppenheimer approximation reproduce one channel quantitatively. The second channel transfers much more energy and is absent in simulations. It grows with hydrogen atom incidence energy and exhibits an energy-loss onset equal to the Ge surface bandgap. This leads us to conclude that hydrogen atom collisions at the surface of a semiconductor are capable of promoting electrons from the valence to the conduction band with high efficiency. Our current understanding fails to explain these observations. 
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  3. Free, publicly-accessible full text available June 12, 2024
  4. Abstract Key Points

    Previous work revealed that H atoms with sufficient translational energy can excite electrons over the band gap of a semiconductor in a surface collision.

    We studied the isotope effect of the energy transfer by H/D substitution and performed band structure calculations to elucidate the underlying excitation mechanism.

    Our results suggest a site‐specific mechanism that requires the atom to hit a specific surface site to excite an electron‐hole pair.

     
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