The present review paper provided an overall overview of various kinds, synthesis techniques, characteristics, features and uses of nanomaterials.

We are examining the impact of a course-based undergraduate research experience (CURE) at a land-grant, Hispanicserving institution in the southwestern United States. Students in our CURE completed one or two extended research projects over a single semester. Our CURE enrolled a high proportion of underrepresented minority students (70.3%), including 60.2% Hispanic students. One year after CURE completion, 31.5% of CURE students had graduated with a STEM degree, and 54.3% were enrolled in a STEM major. Pre-and postcourse surveys of indicators of persistence including scientific selfefficacy, scientific identity, valuing scientific community objectives, and intention to persist showed positive shifts. Impacts on STEM persistence have implications for the role of our CURE in diversifying the STEM pipeline, particularly for students historically underrepresented in STEM.

Current trends in the field of educational technology indicate a shift in pedagogical assumptions and theoretical frameworks that favor active involvement of self‐directed learners in a constructivist environment. This study probes the influence of electronic portfolio evaluation on vocabulary learning of Iranian university students and the possible implications this influence affords. For this aim, the study recruited 66 students who were randomly assigned to the e‐portfolio group and the traditional assessment group. The experimental group kept an e‐portfolio in the intermediate level English language course while the traditional assessment group did not. The results revealed that the e‐portfolio group outperformed the traditional assessment group in terms of vocabulary learning on the posttest. The results also showed that e‐portfolio boosted students' motivation for learning new items. The perceptions of the participants in the e‐portfolio group reflected that they benefited from the integration of technology and various educational activities and enjoyed keeping an e‐portfolio. Finally, initial guidelines about how to use the instrument as part of the curriculum are discussed.

Opium addiction and cutaneous leishmaniasis (CL) are endemic in different parts of Iran, particularly in Bam, where a massive earthquake occurred. This study was designed to compare the incidence rate and severity of CL cases among opium addicted and non-addicted individuals in south-eastern Iran. This study was carried out as a prospective cohort by active house-to-house visits of 1,481 habitants in Bam. CL cases were confirmed by smear and identification of Leishmania species was performed using nested-PCR. The data was analyzed by χ2 and t-tests, using SPSS software and also Kaplan-Meier survival curve and long-rank test in Stata 11.2 and P<0.05 was considered as significant. A total of 904 individuals consisting of 226 opium addicted and 678 non-addicted individuals were followed-up for a period of seven years. The two cohorts were similar in terms of age, sex and place of residency. A similar pattern of incidence was observed among the two cohort groups. In contrast, the severity of CL in terms of the number, duration and the size of the lesions in opium addicted individuals was significantly (P<0.001) higher than non-opium addicted individuals. In conclusion, the present findings indicate that there is no relationship between the incidence of CL and opium addiction.

Background: This study aimed to identify the prevalence and potential factors associated with Entamoeba gingivalis in adolescents in the city of Kerman, southeastern Iran, 2017. Methods: In this descriptive cross-sectional study, 315 adolescents (mean age; 15 yr) consisting of 189 males and 126 females were randomly selected. For each adolescent, two specimens were collected for culturing and examination by polymerase chain reaction (PCR). Univariate and multivariate logistic regression models were performed to explore any association with demographic and clinical variables. Results: The prevalence of E. gingivalis was 11.7%. Totally, 30 (15.9%) males and 7 (5.6%) females were infected with E. gingivalis. The rate of infection in males was 2.8 times higher than that in females (P<0.001). Statistical analysis identified 4 major factors including sex (OR=4.12, P<0.001), gingival index with severe inflammation (OR = 50, P<0.001), Candida spp. infection (OR=4.41, P<0.001) and decay-missing- filled teeth [DMFT (OR=3.27, P<0.001)]. In contrast to the aforementioned factors, adolescents with history of antibiotic consumption were significantly protected from E. gingivalis infection (OR= 3.24, P<0.001). Culture media detected 9.2% (n= 29), whilst PCR identified 11.4% (n= 36) of infection. Conclusion: The present findings clearly demonstrate a positive association between E. gingivalis and distinct demographic and clinical risk determinants. Therefore, dental practitioners and health surveillance personnel should be aware of these confounding factors to rigorously detect and critically manage oral health issues in school-age children in order to prevent or at least minimize the eventual periodontal complications in later life.