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Yuli Hardina
Universitas Negeri Padang, Indonesia
Biochemistry, Genetics & Molecular Biology Chemistry Mathematics Physics

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The Effect of Blue Light Exposure on Sleep Quality and Student Productivity in the Digital Learning Era Diana Chandra Dewi; Yuli Hardina
Science Journal Get Press Vol 3 No 3 (2026): July,2026
Publisher : CV. Get Press Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.69855/science.v3i3.686

Abstract

The proliferation of digital learning platforms has substantially increased student screen time, raising concerns about blue light (415–455 nm) exposure and its effects on sleep quality and cognitive productivity. This cross-sectional study examined 216 undergraduate students from three Javanese public universities (2023–2024). Blue light exposure was quantified using lux-meter spectrophotometry; sleep quality via the Pittsburgh Sleep Quality Index (PSQI); and productivity through Grade Point Average (GPA), Perceived Productivity Scale (PPS), and cognitive tests (Trail Making Test A/B, digit span). Regression and mediation analyses were performed. Students with ≥3 hours nightly pre-sleep blue light exposure had significantly poorer PSQI scores (8.6±1.8 vs. 4.1±1.2; p<0.001) and 18.3% lower academic productivity scores. Sleep quality partially mediated the blue light–productivity relationship (β=-0.41, 95% CI: -0.54 to -0.28). Use of blue light-filtering glasses and Night Mode significantly attenuated these effects (p=0.012). These findings provide empirical evidence for evidence-based digital wellness policies in Indonesian higher education.
Local Plastic-Eating Bacteria: The Key to Bioremediation in Indonesian Coastal Waters Kun Mardiwati Rahayu; Yuli Hardina
Science Journal Get Press Vol 3 No 3 (2026): July,2026
Publisher : CV. Get Press Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.69855/science.v3i3.712

Abstract

Marine plastic pollution is a critical environmental problem in Indonesian coastal waters, where inadequate waste management and high population density contribute substantially to plastic leakage into the marine environment. Indigenous plastic-degrading bacteria offer a potentially low-cost bioremediation strategy, yet locally isolated strains remain poorly characterized. This study aimed to isolate, screen, and molecularly identify indigenous bacteria capable of degrading polyethylene terephthalate (PET) and low-density polyethylene (LDPE) from seawater, sediment, and plastic-debris samples collected at three stations in Bungus Bay, Padang City, West Sumatra. From 42 morphologically distinct colonies, five isolates with the largest clear zones were selected and identified through 16S rRNA gene sequencing as strains related to Bacillus cereus, Pseudomonas aeruginosa, Rhodococcus ruber, Achromobacter xylosoxidans, and Bacillus subtilis. Quantitative degradation assays conducted in triplicate over 90 days showed that a three-isolate consortium achieved the highest weight loss of PET (16.3%) and LDPE (11.2%), significantly exceeding single-isolate treatments and abiotic controls (ANOVA, Duncan’s test, p < 0.05). FTIR analysis confirmed polymer oxidation, with carbonyl indices increasing from 0.18 to 0.34 for PET and from 0.05 to 0.21 for LDPE. These findings demonstrate considerable biodegradation potential under laboratory conditions, although field validation is required before in-situ application for marine bioremediation purposes.
Co-Authors Diana Chandra Dewi Kun Mardiwati Rahayu