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All Journal AL KAUNIYAH Jurnal Pendidikan, Sains, Geologi, dan Geofisika (GeoScienceEd Journal)
Gita Panny Nababan
Universitas Bengkulu
Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Chemistry Education Materials Science & Nanotechnology Physics

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Identifikasi Sebaran Peak Ground Acceleration (PGA) Menggunakan Data Mikrotremor di Sekitar Danau Ranau Kabupaten Lampung Barat Gede Oktiana; Arif Ismul Hadi; Muchammad Farid; Efmadani; Gita Panny Nababan; Sefti Dewi Sari; Yola Dwi Ramadhani
Jurnal Pendidikan, Sains, Geologi, dan Geofisika (GeoScienceEd Journal) Vol. 7 No. 2 (2026): May
Publisher : Mataram University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/goescienceed.v7i2.1755

Abstract

West Lampung Regency is located within an active tectonic zone associated with the Sumatra Fault system and is therefore vulnerable to significant earthquake ground shaking. This study aims to identify the spatial distribution of Peak Ground Acceleration (PGA) based on local site characteristics derived from microtremor measurements. Microtremor data were recorded at distributed observation points and analyzed using the HVSR method to determine the dominant frequency (f₀) and amplification factor (A₀) of the soil. The results indicate that f₀ values range from 0.544 to 15.1 Hz, while A₀ values vary between 1.66 and 8.57, reflecting heterogeneous subsurface conditions. These parameters were used to estimate PGA, which ranges from 0.105 to 0.565 g across the study area. Higher PGA values are generally associated with areas characterized by lower dominant frequencies and higher amplification, indicating thicker or softer sediment layers. The resulting PGA distribution map reveals zones with relatively higher seismic response potential. These findings demonstrate the importance of site-specific dynamic characterization in seismic hazard assessment and provide essential information for earthquake risk mitigation and regional development planning in West Lampung Regency.
Molecular Characteristics of The Mercury Reductase Gene Pseudomonas putida from The Lebong Gold Mine Raul Fadillon; Rahma Adelia; Waris Rahman; Gita Panny Nababan; Sipriyadi
Al-Kauniyah: Jurnal Biologi Vol. 19 No. 2 (2026): AL-KAUNIYAH: JURNAL BIOLOGI
Publisher : Department of Biology, Faculty of Science and Technology, Syarif Hidayatullah State Islami

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15408/kauniyah.v19i2.46513

Abstract

Mercury contamination in Lebong Regency has caused serious impacts on public health and environmental quality. Bacteria living in contaminated environments can adapt and develop resistance to mercury through the presence of the merA gene, which plays an important role in converting mercury into a less toxic form. This study aimed to identify and characterize the merA gene in Pseudomonas putida. Molecular identification was carried out using 16S rDNA gene analysis and the polymerase chain reaction (PCR) technique. The obtained DNA sequences were further analyzed to determine gene similarity and phylogenetic relationships. The results showed that the bacterial isolate shared 99% homology with Pseudomonas putida strain CRSD9. The merA gene was 820 bp in length and encoded a mercury reductase enzyme consisting of 310 amino acids. This gene showed 97.78% homology with previously reported mercury reductase genes and contained two important domains, namely Pyridine Nucleotide-Disulfide Oxidoreductase (Pyr Redox) and FAD-linked domains. These findings indicate that Pseudomonas putida has strong potential as a bioremediation agent for reducing mercury pollution in the environment.
Co-Authors Arif Ismul Hadi Efmadani Farid, Muchammad Gede Oktiana Rahma Adelia Raul Fadillon Sefti Dewi Sari Sipriyadi Waris Rahman Yola Dwi Ramadhani