The effect of S-content on the medium-and short-range order structure of Ge20Se80−xSx$$\left(x=0,15,30 \mathrm {at}\%\right)$$ x = 0 , 15 , 30 at % , has been investigated by using high-energy X-ray diffraction. Medium-range order changes, as illustrated by the parameters of the first sharp diffraction peak, were discussed in the light of the microcrystalline model. The short-range order parameters have been obtained by the analysis of the first two peaks in the curve of the total radial distribution function. The current results indicate that S-atoms enter the host network of the stiffness composition (Ge20Se80) as compensation of Se-atoms.

Background: Testicular self-examination (TSE) is the performance of a physical self-assessment of the testicles for changes in mass or shape in the scrotum that could be indicative of disease. Aim: To evaluate the effect of educational guidelines on knowledge and practice regarding testicular self-examination among male students. Design: A quasi-experimental research design was utilized in the present study. Sample: A convenience sample of (100) male students was included in this study. Setting: The study was conducted at the Technical Institute of Nursing at South Valley University. Tools: Three tools were utilized to collect data. First tool: a structured interviewing questionnaire used to assess demographic data.  Second tool: to assess male students' knowledge sheet regarding testicular self-examination. Third tool: A simplified testicular self-examination checklist to assess male students' practice. Results: There was a highly statistically significant improvement in the total level of male students' knowledge and practice regarding testicular self-examination after the implementation of educational guidelines compared to before. Conclusion: Educational guidelines about testicular self-examination enriched male students' knowledge and practice more than before. Recommendations: A continuous male student educational session about testicular self-examination is recommended to upgrade the knowledge and skills of male students.