International Journal of Natural Science Studies and Development (IJOSS)
Focus The International Journal of Natural Science Studies and Development (IJOSS) is an academic journal dedicated to disseminating the latest and most innovative research in the field of natural sciences. IJOSS provides a platform for researchers, academics, and practitioners to publish high-quality research findings related to various disciplines within the natural sciences. The journal is committed to supporting scientific and technological advancement through the publication of articles that significantly contribute to the understanding and application of natural sciences. The International Journal of Natural Science Studies and Development (IJOSS) focuses on publishing high-quality research articles, literature reviews, and case studies in the field of natural sciences. Scope: Biological Sciences: Research related to living organisms, ecology, genetics, microbiology, botany, zoology, evolutionary biology, living organisms, ecosystems, genetics, biotechnology, and environmental biology. Chemistry: Research on chemical reactions, chemical substances, synthesis, materials chemistry, and environmental. Physical Sciences: Studies in physics, earth sciences, meteorology, environmental science, fundamental principles of physics, applied physics, materials physics, and nuclear physics. Interdisciplinary Natural Sciences: Integration of natural sciences with other disciplines, including biochemistry, biophysics, environmental science, and materials science. Developmental Studies: Research on the application of natural science principles in technology, environmental sustainability, and socio-economic development. Environmental Studies: Articles addressing climate change, pollution control, conservation efforts, and sustainability practices. Agricultural Sciences: Research focusing on agronomy, soil science, plant pathology, entomology, crop management, crop production, agricultural biotechnology, sustainable farming practices, and pest management. Natural Resource Management: Studies on the sustainable use and management of natural resources like water, forests, and minerals. Civil Engineering: Research that explores the intersection of natural sciences and civil engineering, including structural engineering, environmental engineering, geotechnical engineering, and sustainable infrastructure development. Scientific Methodology: Innovative methods and approaches in conducting and applying natural science research. Geosciences: Research on geological processes, geography, geophysics, and environmental changes.
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<![CDATA[Growth of Nannochloropsis oculata Cultured using Tofu Liquid Waste Fertilizer ]]>
<![CDATA[Rahmadan, Rizky Yanuar]]>;
<![CDATA[Satyantini, Woro Hastuti]]>;
<![CDATA[Sari, Luthfiana Aprilianita]]>
<![CDATA[ International Journal of Natural Science Studies and Development (IJOSS) Vol. 2 No. 1 (2025): IJOSS ]]>
Publisher : <![CDATA[PT Inovasi Pratama Internasional ]]>
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DOI: 10.55299/ijoss.v2i1.18
<![CDATA[Growth of Nannochloropsis oculata is affected by nutrients in its culture media. Tofu liquid waste which is processed into fertilizer is expected to be an alternative nutrient that is more economical for microalgae culture activities. The purpose of this study was to determine the effect of tofu liquid waste fertilizer with different concentrations on the growth of Nannochloropsis oculata. This study used an experimental method with Completely Randomized Design (CRD). The treatment was different concentrations namely P1 (1 ml L-1), P2 (3 ml L-1), P3 (5 ml L-1), P4 (7 ml L-1) and P0 (Walne nutrient 1 ml L-1) each treatment were repeated four times. The main parameters in this study were cell density, cell growth rate and cell doubling time. Data obtained were analyzed using Analysis of Variance (ANOVA) and continued with Duncan's Multiple Range Test (DMRT). Results showed that the treatment of tofu liquid waste fertilizer with different concentrations had a significant different (p<0,05) on the growth of Nannochloropsis oculata. Concentration of 5 ml L-1 (P3) was the best concentration for the growth of Nannochloropsis oculata with peak cell density 1,335±13.54x104 cells ml-1, cell growth rate 0.900±0.001 cells ml-1 day-1 and cell doubling time 18.493±0.026 hours.]]>
<![CDATA[Analysis of the Quality of the Anahoni River Based on Physical and Biological Parameters ]]>
<![CDATA[M. Sehol]]>;
<![CDATA[Kasmawati]]>;
<![CDATA[Mangesa, Rosita]]>;
<![CDATA[Irsan, Irsan]]>;
<![CDATA[Rosmida R Dahlan]]>
<![CDATA[ International Journal of Natural Science Studies and Development (IJOSS) Vol. 2 No. 1 (2025): IJOSS ]]>
Publisher : <![CDATA[PT Inovasi Pratama Internasional ]]>
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DOI: 10.55299/ijoss.v2i1.19
<![CDATA[This study aims to analyze the quality of the waters of the Anahoni river due to gold mining by covering physical and biological parameters. Physical parameters include color, temperature and TSS (Total Suspended Solids). In the results of measuring the color of the waters of the Anahoni River and Waelata River at all research stations, it ranges from 1 - 5 NTU, which is still below the maximum limit. The results of the water temperature values at the research stations varied between 26.4 – 34.40C. The measured water TSS value at all research stations ranged from 0.011 - 0.018 indicating that the TSS value was below the quality standard value. Biological parameters using coliform bacteria. The results of using fecal coliform bacteria varied at each research station with a range of 0 – 68 MPN/100 mL]]>
<![CDATA[Analysis of the Concentration of Mercury (Hg) in the Soil Around the Gold Mining Processing Area in Buru Regency ]]>
<![CDATA[M. Sehol]]>;
<![CDATA[Kasmawati, Kasmawati]]>;
<![CDATA[Mangesa, Rosita]]>;
<![CDATA[Irsan, Irsan]]>;
<![CDATA[R Dahlan, Rosmida]]>
<![CDATA[ International Journal of Natural Science Studies and Development (IJOSS) Vol. 2 No. 1 (2025): IJOSS ]]>
Publisher : <![CDATA[PT Inovasi Pratama Internasional ]]>
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DOI: 10.55299/ijoss.v2i1.20
<![CDATA[Mercury is widely used in Unlicensed Gold Mining (PETI) in Indonesia, one of which is PETI activities in the Buru Regency area. Traditional gold mining in this area began in 2011, initially starting at the Mount Botak location, Wamsait Hamlet, Dava Village, Waelata District, and was subsequently carried out in four other locations, namely in the Lea Bumi, Gogorea, Derlale/Metar and Waepotih/Waedanga areas. This research aims to determine mercury levels in the soil around gold mining locations. This type of research is a survey with a quantitative approach. This research is divided into several stages, namely: (1) Research design; (2) Field research; (3) Data collection; (4) Laboratory analysis; (5) Data processing. The research results show that there is heavy metal mercury contamination in the soil and plants around the gold mining processing area in Buru Regency. For soil samples, of the 43 samples analyzed, 41 samples were detected with mercury concentrations exceeding the quality standard limit, where the highest concentration reached 18,430 ppm. This indicates that unlicensed gold mining in Buru Regency which uses the heavy metal mercury in the processing process has a serious impact on pollution, especially on the land around the gold mining area.]]>
<![CDATA[Government Policies and Their Impact on Palm Oil Agribusiness ]]>
<![CDATA[Novrini, Susan]]>;
<![CDATA[Nasution, Isnirobit]]>;
<![CDATA[Nurali, Muhamad]]>;
<![CDATA[Pratama, Aldi]]>;
<![CDATA[Oksa, Aldias Michael]]>;
<![CDATA[Limbong, Riski Suryanda]]>
<![CDATA[ International Journal of Natural Science Studies and Development (IJOSS) Vol. 2 No. 1 (2025): IJOSS ]]>
Publisher : <![CDATA[PT Inovasi Pratama Internasional ]]>
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DOI: 10.55299/ijoss.v2i1.21
<![CDATA[This study aims to analyze government policies and their impacts on palm oil agribusiness in Indonesia. Palm oil is a strategic commodity that plays an important role in the country's economy, but it also faces various challenges related to environmental, social, and economic aspects. This study uses literature study methods, conceptual analysis, and documentation to explore government policies that affect this sector, as well as their impacts on the sustainability and competitiveness of palm oil agribusiness. The results of the study show that policies involving aspects of regulation, licensing, sustainability certification, and land management have significant impacts, both positive and negative. Policies that support the sustainability of palm oil production, such as the implementation of ISPO (Indonesian Sustainable Palm Oil) and a moratorium on land expansion, contribute to improving the image and competitiveness of the industry. However, inconsistent policy implementation and lack of supervision often hinder the achievement of sustainability goals and invite criticism from various parties, both domestic and international. In addition, policies related to taxes, trade, and economic incentives also affect market dynamics and profits for palm oil agribusiness actors. This study suggests the need for improvements to government policies that are more inclusive and based on sustainability principles to support the growth of a more environmentally friendly and sustainable palm oil agribusiness.]]>
<![CDATA[Integration of Augmented Reality in Physics E-Module: Heat and Heat Transfer Study through Ulos Making for Enhancing Analytical Thinking ]]>
<![CDATA[Nasution, Eni Sumanti]]>;
<![CDATA[Kasmawati]]>;
<![CDATA[Sarpin]]>
<![CDATA[ International Journal of Natural Science Studies and Development (IJOSS) Vol. 2 No. 1 (2025): IJOSS ]]>
Publisher : <![CDATA[PT Inovasi Pratama Internasional ]]>
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DOI: 10.55299/ijoss.v2i1.22
<![CDATA[This research developed an Augmented Reality (AR)-based physics e-module that integrates heat and heat transfer concepts through the local wisdom of Ulos making to enhance students' analytical thinking skills. The study employed Research and Development (R&D) methodology using the ADDIE model. The subjects were 30 seventh-grade students from SMP Negeri 5 Padangsidimpuan. Data collection instruments included expert validation questionnaires, practicality questionnaires from teachers and students, pre-test and post-test for analytical thinking, observation sheets, and interviews. Data analysis used descriptive statistics and paired sample t-test. The results showed that the AR e-module was highly valid with an average validation score of 88.5% from material, media, and pedagogy experts. The practicality level was categorized as very practical according to teachers (86%) and students (88%). The effectiveness test demonstrated significant improvement in students' analytical thinking skills with an N-Gain of 0.58 (moderate category) and significant t-test results (p < 0.001). The integration of Ulos cultural context with AR technology successfully created meaningful learning experiences and increased student motivation by 94%. This research supports SDG 4 (Quality Education) by providing innovative technology-based learning methods that preserve local cultural wisdom.]]>
