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S. Roslan, N. Ahmad, N. Nabilla and Z. Ghiami

Abstract

This study attempted to determine the level of psychological well-being among postgraduate students. The study also aimed to assess the relationship between psychological well-being and demographic factors, such as age and field of study. Psychological well-being questionnaires were administered to a sample of 192 Master of Education students. The findings demonstrated that Master of Education students possessed a slightly high level of psychological well-being. Differences were found in students’ psychological well-being across age groups, F (4, 167) = 3.178, p = 0.01, and field of study, F (8, 163) = 2.668, p = 0.01, respectively. According to the results, students in the age group of 41 years and above possessed the highest level of psychological well-being (M = 5, SD = 0.71).

Open access

M.F. Rahman, M. Rusnam, N. Gusmanizar, N.A. Masdor, C.H. Lee, M.S. Shukor, M.A.H. Roslan and M.Y. Shukor

Abstract

Toxicants removal through microorganism’s action is intensely being sought due to economic reasons. The aim of this paper is to isolate a bacterium that is able to reduce molybdenum blue and at the same time can grow on the detergent Sodium Dodecyl Sulfate (SDS). Biochemical analysis resulted in a tentative identification of the bacterium as Enterobacter sp. strain Neni-13. Growth on SDS showed a 100 % removal at 800 mg/L SDS within 12 days. The removal of SDS from media was confirmed through Methylene Blue Active Substances Assay. Molybdenum reduction using sodium molybdate as a substrate was characterized using a microplate assay. The optimum pH and temperature for molybdenum reduction was between 6.0 and 6.5, and at 37 °C, respectively. Glucose was the best electron donor for molybdate reduction. Phosphate and molybdate concentrations of between 2.5 and 5.0 mM and at 15 mM, were optimal for molybdate reduction, respectively. Molybdate reduction was inhibited by the heavy metals mercury, silver, copper and chromium at 2 ppm. The ability of this bacterium to detoxify molybdate and degrade the SDS makes this bacterium an important tool for bioremediation of toxicants in soil.