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Looking at the background vulnerability and increasing incidence of suicides among medical students, more information on its burden and causes is needed. A cross-sectional study was conducted at a medical college to assess prevalence of suicide ideation and associated factors amongmedical students. Data were collected through a web-based survey questionnaire using Patient Health Questionnaire-9 and items on suicide cognitions, suicide attempt historyand risk factors. Bivariate and multivariate analyses were performed in SPSS. A total of 5

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The surface activation of titanium plays a key role in the biological properties of titanium implants as bone repair materials. Improving the ability to induce apatite precipitation on the surface was a well-accepted titanium bioactivation route. In this study, advanced femtosecond laser microfabrication was applied to modify titanium surfaces, and the effect of femtosecond laser etching on apatite precipitation was investigated and compared with popular titanium modification methods. Meanwhile, the mechanism of apatite formation after