Introduction: Mak nyahs (male-to-female transgenders) often consume feminizing hormones to achieve and maintain the female physical appearance. They do it without professional prescription/advise, and often take excessive doses. This renders them at risk of developing complications of hormone consumption. This paper provides some quantitative data on hormone consumption among mak nyahs in Kuantan, Pahang, in Malaysia. Materials and Methods: A cross-sectional study was carried out from July to August in 2015 among 35 mak nyahs. Convenience sampling was used. Participants who gave consent answered an interview-guided questionnaire which documents socio-demographic profile, hormone usage, and morbidities as a result of hormone consumption. Data was analysed using SPSS, Version 16.0. (version 16). Results: Majority of the subjects were Malays (91.4%) and Muslims (97.1%), their median (IQR) age being 31 (±17) years, more than half (57.1%) were between 20 to 40 years old. Most (80.0%) of them are sex workers. Oral hormone was most commonly used (88.6%), while more than half (67.7%) of them added hormone injections. Almost all subjects purchased hormones over the counter from local pharmacies (94.2%). However, many received information on hormone from non-professional sources. Possible adverse effects of hormones reported among subjects were hypertension, ischemic heart disease, diabetes mellitus, and venous thrombo-embolism. Conclusion: Hormone consumption was very common among the subjects in this study, and may be associated with certain medical problems. Medical personnel must pay more attention in educating the mak nyahs on adverse effects of hormones consumption. Mak nyahs should also be screened for complications every time they seek medical attention.
Pyrolyzed Fe-N-C-based catalysts, particularly FeN4, are reported to show enhanced catalytic activity for some chemical reactions, particularly for the oxygen reduction reaction (ORR). Here, we present a computational study to investigate another pyrolyzed Fe-N-C-based catalyst, i.e. Fe2N6, adsorbed on graphene with special emphasis on the edges of graphene nanoribbons (both zig-zag and armchair configurations) as a candidate for Fe dual-atom catalysts (Fe-DACs). Utilizing density functional theory calculations along with microkinetic simulations, we investigate the influence of graphitic edges on the stability and ORR activity of Fe-DAC active sites. Our findings indicate that the presence of graphitic edges, particularly the zig-zag configuration, significantly lowers the formation energy of Fe-DAC active sites, making them more likely to form at the edges. Furthermore, several Fe-DAC active sites at graphitic edges exhibit exceptional ORR performance, surpassing the commonly employed FeN4 active site in SAC systems and even exceeding the benchmark Pt(111) surface. Notably, the (Fe2N6)o@z1 active site demonstrates outstanding performance in both associative and dissociative mechanisms. These results highlight the role of graphitic nanopores in enhancing the catalytic behavior of Fe-DAC active sites, providing valuable insights for designing efficient non-precious metal catalysts for ORR applications.