Application of four novel fungal strains to remove arsenic from contaminated water in batch and column modes.

Immobilized biomass of novel indigenous fungal strains FNBR_3, FNBR_6, FNBR_13, and FNBR_19 were evaluated for arsenic (As) removal from aqueous solution. Alginate beads containing 0.1 g biomass were used in a batch experiment (200 mg l-1 As; pH 6). Biosorption equilibrium established in first 2 h with As adsorption (mg g-1) as 70, 68, 113 and 90 by FNBR_3, FNBR_6, FNBR_13 and FNBR_19, respectively. The equilibrium was fitted to the Langmuir model (r2 = 0. 90-0.97). The absorption kinetic followed the pseudo second order. Changes in the surface of fungal cells and intracellular As-uptake by fungal biomass were also confirmed by scanning electron microscopy combined with X-ray energy dispersive spectrometer. The presence of different functional groups on fungal cells capable of As-binding was investigated by FTIR. The As-removal by immobilized fungal beads tested in the packed columns also. The As-adsorption by biomass (qe as mg g-1) were recorded as 59.5 (FNBR_3 and FNBR_6), 74.8 (FNBR_13), and 66.3 (FNBR_19) in the column and validated by Thomas model. This is the first report concerning the arsenic removal by immobilized biomass of these novel fungal strains from aqueous solution both in batch and column studies with a prospect of their further industrial application.

Psychosocial Problems among Adolescent Students: An Exploratory Study in the Central Region of Nepal.

BACKGROUND: Recently, schools have drawn attention as dominant factors for psychosocial development of students. Nepal, however, has limited studies on this issue. This study sought to assess the prevalence of psychosocial dysfunction and its association with family-related factors among adolescent Nepali students. METHODS: Taking 787 adolescent students from 13 schools of Hetauda municipality, we accomplished a cross-sectional study. A set of structured questionnaire and Y-PSC was adopted to collect data, which were analyzed using SPSS with 95% of confidence interval. RESULTS: One-fifth (17.03%) adolescent students suffered with psychosocial dysfunction. Male students (9.50%) were more affected, compared to female students (7.80%). The proportion of psychosocial dysfunction rose with the rise in age group and grade. Frequency of family dispute was significantly associated with psychosocial dysfunction OR = 13.24 (95% CI: 2.27-17.23). CONCLUSION: Interventions on psychosocial dysfunction need a great start, targeting adolescents, their caregivers, and community stakeholders, with a special emphasis on the school setting.