Elemental boron doping behavior in silicon molecular beam epitaxy

Boron-doped Si epilayers were grown by molecular beam epitaxy (MBE) using an elemental boron source, at levels up to 2×1020 cm−3, to elucidate profile control and electrical activation over the growth temperature range 450–900 °C. Precipitation and surface segregation effects were observed at doping levels of 2×1020 cm−3 for growth temperatures above 600 °C. At growth temperatures below 600 °C, excellent profile control was achieved with complete electrical activation at concentrations of 2×1020 cm−3, corresponding to the optimal MBE growth conditions for a range of Si/SixGe1−x heterostructures

Does Genital Self-image Correspond with Sexual Health before and after Vaginoplasty?

Patient-reported outcomes regarding sexual health are lacking or have not been validated for transgender patients following vaginoplasty. The aim of this study is to further characterize the difference in sexual health, genital self-image, and the relationship between them for patients who were pre- and postvaginoplasty. METHODS: A community advisory board informed an anonymous online survey utilizing patient-reported outcomes. Pre- and postvaginoplasty respondents were recruited online. Survey measures included the Female Genital Self-Image Scale (FGSIS) and the Patient-Reported Outcomes Measurement Information System sexual health measures. Welch approximation t tests were performed for FGSIS and Patient-Reported Outcomes Measurement Information System questions, using Bonferroni correction. RESULTS: A total of 690 respondents prevaginoplasty (n = 525; 76%) and postvaginoplasty (n = 165; 24%) participated. The postoperative cohort, compared with the preoperative cohort, reported higher scores for orgasm (P = 0.0003), satisfaction (P = 0.001), and pleasure (P = 0.002). FGSIS total score was higher among postoperative respondents (79.4% ± 17.1%) than preoperative respondents (50.6% ± 15.1%) (P \u3c 0.0001). Using Spearman rho, no significant correlation between FGSIS total score and any Patient-Reported Outcomes Measurement Information System subsectional measures was observed for the postoperative cohort, but a correlation (P \u3c0.001) was observed for the preoperative cohort. CONCLUSIONS: Individuals who are contemplating vaginoplasty have worse sexual health and genital self-image than those who underwent vaginoplasty, yet genital self-image does not correlate directly with sexual health. Sexual health is multimodal for each person

Evolution in the Disks and Bulges of Group Galaxies since z=0.4

We present quantitative morphology measurements of a sample of optically selected group galaxies at 0.3 < z < 0.55 using the Hubble Space Telescope (HST) Advanced Camera for Surveys (ACS) and the GIM2D surface brightness--fitting software package. The group sample is derived from the Canadian Network for Observational Cosmology Field Redshift survey (CNOC2) and follow-up Magellan spectroscopy. We compare these measurements to a similarly selected group sample from the Millennium Galaxy Catalogue (MGC) at 0.05 < z < 0.12. We find that, at both epochs, the group and field fractional bulge luminosity (B/T) distributions differ significantly, with the dominant difference being a deficit of disk--dominated (B/T < 0.2) galaxies in the group samples. At fixed luminosity, z=0.4 groups have ~ 5.5 +/- 2 % fewer disk--dominated galaxies than the field, while by z=0.1 this difference has increased to ~ 19 +/- 6 %. Despite the morphological evolution we see no evidence that the group environment is actively perturbing or otherwise affecting the entire existing disk population. At both redshifts, the disks of group galaxies have similar scaling relations and show similar median asymmetries as the disks of field galaxies. We do find evidence that the fraction of highly asymmetric, bulge--dominated galaxies is 6 +/- 3 % higher in groups than in the field, suggesting there may be enhanced merging in group environments. We replicate our group samples at z=0.4 and z=0 using the semi-analytic galaxy catalogues of Bower et al (2006). This model accurately reproduces the B/T distributions of the group and field at z=0.1. However, the model does not reproduce our finding that the deficit of disks in groups has increased significantly since z=0.4.Comment: Accepted for publication in MNRAS. 20 pages, 17 figure

Familiar Infections in Novel Anatomy: Patient Reports of Sexually Transmitted Infections After Gender-Affirming Penile Reconstruction

Background Sexually transmitted infections (STIs) after penile reconstruction in transgender, nonbinary, and other gender expansive (T/GE) populations have not previously been described, despite known risk factors in the population. After T/GE penile reconstruction, care providers may underdiagnose STI without anatomically appropriate guidelines. Methods A detailed anonymous online survey of experiences of T/GE penile reconstruction patients was constructed with community input. Respondents were recruited from online support groups. Results A total of 128 T/GE people with experience of penile reconstruction responded to an anonymous survey posted in online support groups from January to May 2020. Seven respondents (5.5%) self-reported 1 or more of the listed STIs at any point after penile reconstruction. All respondents with neourethras were diagnosed with localized STIs in nonurethral (extrapenile) locations only, and lack of vaginectomy was correlated with STI (P = 0.002). Sexually transmitted infections were correlated with reporting sex with cisgender men (P = 0.001), transgender men (P = 0.009), and transgender women (P = 0.012). Of health care access variables, only receiving health care at a community health center was correlated with STI history (P = 0.003). Conclusions This exploratory survey indicates that STI occurs after penile reconstruction in T/GE patients. Clinical confirmation is needed to identify specific risk factors and relative susceptibility of postreconstruction anatomy to STIs. Given no previous surveillance recommendations for this population and the correlation of health care provider location with STI prevalence, underdiagnoses are likely. Based on the authors' clinical experience, we describe a urogenital screening algorithm after gender-affirming penile reconstruction. </jats:sec

Genital Hypoplasia before Gender-Affirming Vaginoplasty: Does the Robotic Peritoneal Flap Method Create Equivalent Vaginal Canal Outcomes?

BACKGROUND: Insufficient genital tissue has been reported as a barrier to achieving depth in gender-affirming vaginoplasty. The authors sought to characterize vaginal depth and revision outcomes in patients with genital hypoplasia undergoing robotic peritoneal flap vaginoplasty. METHODS: Retrospective case-control analysis of patients undergoing robotic peritoneal vaginoplasty between September of 2017 and August of 2020 was used. All 43 patients identified as having genital hypoplasia (genital length \u3c7 \u3ecm) were included with 49 random controls from the remaining patients with greater than 7 cm genital length. Baseline clinical characteristics and perioperative variables were recorded to identify potential confounders. Outcomes measured included vaginal size reported at last visit and undergoing revision surgery for depth or for vulvar appearance. RESULTS: Patients were well matched other than median body mass index at the time of surgery, which was greater in the hypoplasia cohort by 3.6 kg/m 2 ( P \u3c 0.0001). Patients had a median of 1-year of follow-up, with a minimum follow-up of 90 days. No significant differences in outcomes were observed, with a median vaginal depth of 14.5 cm (interquartile range, 13.3 to 14.5 cm), and a median width of dilator used of 3.8 cm (interquartile range, 3.8 to 3.8 cm). No depth revisions were observed, and an 11% ( n = 10) rate of external revision occurred. CONCLUSIONS: Patients with genital hypoplasia had equivalent dilation outcomes in a case-control analysis with consistent follow-up past 90 days. The robotic peritoneal flap vaginoplasty technique provides vaginal depth of 14 cm or greater regardless of genital tissue before surgery. Further investigation with patient-reported outcome measures is warranted. CLINICAL QUESTION/LEVEL OF EVIDENCE: Risk, II

Does Genital Self-image Correspond with Sexual Health before and after Vaginoplasty?

Background:. Patient-reported outcomes regarding sexual health are lacking or have not been validated for transgender patients following vaginoplasty. The aim of this study is to further characterize the difference in sexual health, genital self-image, and the relationship between them for patients who were pre- and postvaginoplasty. Methods:. A community advisory board informed an anonymous online survey utilizing patient-reported outcomes. Pre- and postvaginoplasty respondents were recruited online. Survey measures included the Female Genital Self-Image Scale (FGSIS) and the Patient-Reported Outcomes Measurement Information System sexual health measures. Welch approximation t tests were performed for FGSIS and Patient-Reported Outcomes Measurement Information System questions, using Bonferroni correction. Results:. A total of 690 respondents prevaginoplasty (n = 525; 76%) and postvaginoplasty (n = 165; 24%) participated. The postoperative cohort, compared with the preoperative cohort, reported higher scores for orgasm (P = 0.0003), satisfaction (P = 0.001), and pleasure (P = 0.002). FGSIS total score was higher among postoperative respondents (79.4% ± 17.1%) than preoperative respondents (50.6% ± 15.1%) (P < 0.0001). Using Spearman rho, no significant correlation between FGSIS total score and any Patient-Reported Outcomes Measurement Information System subsectional measures was observed for the postoperative cohort, but a correlation (P <0.001) was observed for the preoperative cohort. Conclusions:. Individuals who are contemplating vaginoplasty have worse sexual health and genital self-image than those who underwent vaginoplasty, yet genital self-image does not correlate directly with sexual health. Sexual health is multimodal for each person

The Role of Vascular Endothelial Growth Factor-Induced Activation of NADPH Oxidase in Choroidal Endothelial Cells and Choroidal Neovascularization

Rac1, a subunit of NADPH oxidase, plays an important role in directed endothelial cell motility. We reported previously that Rac1 activation was necessary for choroidal endothelial cell migration across the retinal pigment epithelium, a critical step in the development of vision-threatening neovascular age-related macular degeneration. Here we explored the roles of Rac1 and NADPH oxidase activation in response to vascular endothelial growth factor treatment in vitro and in a model of laser-induced choroidal neovascularization. We found that vascular endothelial growth factor induced the activation of Rac1 and of NADPH oxidase in cultured human choroidal endothelial cells. Further, vascular endothelial growth factor led to heightened generation of reactive oxygen species from cultured human choroidal endothelial cells, which was prevented by the NADPH oxidase inhibitors, apocynin and diphenyleneiodonium, or the antioxidant, N-acetyl-l-cysteine. In a model of laser-induced injury, inhibition of NADPH oxidase with apocynin significantly reduced reactive oxygen species levels as measured by dihydroethidium fluorescence and the volume of laser-induced choroidal neovascularization. Mice lacking functional p47phox, a subunit of NADPH oxidase, had reduced dihydroethidium fluorescence and choroidal neovascularization compared with wild-type controls. Taken together, these results indicate that vascular endothelial growth factor activates Rac1 upstream from NADPH oxidase in human choroidal endothelial cells and increases generation of reactive oxygen species, contributing to choroidal neovascularization. These steps may contributed to the pathology of neovascular age-related macular degeneration