Jurnal Natural
Jurnal Natural (J. Natural) is a premier, multidisciplinary, open-access journal dedicated to the rapid publication of high-quality, peer-reviewed research in the fields of mathematics, biological sciences, physics, chemistry, pharmacy, statistics, and informatics. Published by the Faculty of Mathematics and Natural Sciences at Universitas Syiah Kuala, Indonesia, J. Natural is committed to fostering the global exchange of scientific knowledge and ideas. J. Natural collaborate with some academic associations in Indonesia including IndoMS (Mathematics), HKI (Chemistry), PHI (Physics) and HAGI (Geophysics). The journal publishes three issues per year (February, June, and October) and welcomes submissions from researchers, scholars, and professionals worldwide. J. Natural focuses on a wide range of scientific scopes, including, but not limited to: Mathematics: Algebra, analysis, geometry, topology, and applied mathematics Biological Sciences: Cell biology, genetics, microbiology, molecular biology, biochemistry, biophysics, ecology, and evolution Physics: Classical and quantum mechanics, geophysics, statistical mechanics, electromagnetism, optics, and condensed matter physics Chemistry: Organic, inorganic, physical, analytical, and theoretical chemistry Pharmacy: Pharmaceutical chemistry, pharmacology, pharmacognosy, pharmaceutics, and clinical pharmacy Statistics: Mathematical statistics, biostatistics, statistical theory, and statistical methods Informatics: Computer science, artificial intelligence, data science, machine learning, and cybersecurity J. Natural is an entirely open-access journal, with a transparent and efficient blind review process that ensures the highest standards of quality and integrity. The journal applies a publishing charge for authors, ensuring the sustainability of the publication and the accessibility of the content for readers worldwide.
Articles
5 Documents
<![CDATA[Determinants of the Regional Innovation Index in the VUCA Era: A Robust Regression MM-Estimation Approach ]]>
<![CDATA[Erina Herwindalita]]>;
<![CDATA[Siskarossa Ika Oktora]]>
<![CDATA[ Jurnal Natural Vol. 26 No. 1 (2026) ]]>
Publisher : <![CDATA[Faculty of Mathematics and Natural Science (FMIPA), Universitas Syiah Kuala ]]>
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DOI: 10.24815/jn.v26i1.314
<![CDATA[The world is experiencing rapid changes, making it more complex and difficult to predict. This situation is called the Volatility, Uncertainty, Complexity, and Ambiguity (VUCA) Era. Therefore, the demand for rapid adaptation through innovation is greater. However, data from the World Intellectual Property Organization shows that Indonesia's innovation index in 2022 still ranked 75th of 132 countries. It indicates that Indonesia still faces challenges and weaknesses in managing the innovation cycle, particularly in government innovation. Consequently, it is crucial to conduct research on local government innovation by identifying the determinants of the regional innovation index (RII) in 2022. In this research, robust regression with MM-estimation was used to address outlier issues in the data. The result shows that the digital skills score, degree of fiscal decentralization, and innovation capability scores have a significant positive effect on the RII in 2022. Meanwhile, the high school education completion rate and the ratio of students and lecturers have a significant negative effect on the RII in 2022.]]>
<![CDATA[A novel instrument for ascorbic acid detection based on the eddy current principle for oranges (Citrus x sinensis), pineapples (Ananas comosus), and bilimbi (Averrhoa bilimbi) ]]>
<![CDATA[Shahibul Fadhli]]>;
<![CDATA[Muhammad Syukri Surbakti]]>;
<![CDATA[Khairi Suhud]]>;
<![CDATA[Zakaria Husen]]>;
<![CDATA[Ahmad Fairuz Omar]]>;
<![CDATA[Sidratun Ulfa Sari]]>
<![CDATA[ Jurnal Natural Vol. 26 No. 1 (2026) ]]>
Publisher : <![CDATA[Faculty of Mathematics and Natural Science (FMIPA), Universitas Syiah Kuala ]]>
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DOI: 10.24815/jn.v26i1.325
<![CDATA[Ascorbic acid, a water-soluble vitamin, is prone to degradation during the storage of fruits and vegetables, necessitating fast and reliable detection techniques for quality control. This study presents a digital instrument employing the eddy current principle for the sensor, designed with a slit-structured copper (Cu) electrode coated with a TiO₂ nanocomposite, to quantify ascorbic acid levels in orange, pineapple, and bilimbi juice. The system incorporates an Arduino Uno microcontroller and an inductive proximity sensor to monitor voltage shifts induced by interactions between ascorbic acid molecules and the electrode surface. Calibration was carried out using standard solutions ranging from 1 to 9 ppm, with UV-Vis spectrophotometry serving as the validation method. The sensor exhibited a strong linear correlation (R² = 0.991), with output voltage decreasing from 6.12 V at 1 ppm to 4.86 V at 9 ppm. Measured concentrations were 8.93 ppm (orange), 7.07 ppm (pineapple), and 4.59 ppm (bilimbi), closely aligning with UV-Vis results. The mean relative error was 3.25%, indicating an accuracy of 96.74%. Statistical analysis using linear regression and the t-test confirmed no significant difference from the reference method. These results highlight the sensor's potential as a rapid and precise tool for ascorbic acid detection in the agri-food industry.]]>
<![CDATA[The relationship between religiosity level and financial satisfaction in Asian countries with multilevel modeling ]]>
<![CDATA[Pamela Ayu Gitayani]]>;
<![CDATA[Kismiantini]]>
<![CDATA[ Jurnal Natural Vol. 26 No. 1 (2026) ]]>
Publisher : <![CDATA[Faculty of Mathematics and Natural Science (FMIPA), Universitas Syiah Kuala ]]>
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DOI: 10.24815/jn.v26i1.363
<![CDATA[Subjective financial satisfaction does not always reflect objective economic conditions, as seen in several Asian countries that have strong economies but tend to report low levels of public welfare. This study differs from previous global studies in that it focuses on Asia, a region with high cultural and religious diversity. This phenomenon has prompted studies on the role of non-economic factors, such as religiosity, in shaping financial perceptions. This study aims to analyse the relationship between religiosity and sociodemographic variables on financial satisfaction in Asian countries using multilevel modeling. A multilevel approach was used because the data has hierarchical structure data (individuals nested within countries). Using a multilevel approach, this study is able to capture the influence of religiosity at both individual and country levels. This study uses secondary data from the seventh wave of the World Values Survey (WVS) (2017–2022), which includes 30,878 respondents from 20 Asian countries. The multilevel models constructed are the null model, the random intercept model, and the random slope model. Religiosity is measured through two indicators: the importance of God in life and belief in God. The results of this study indicate that the random intercept model is the best model. The importance of God, age, being female, higher education, and income positively influence financial satisfaction, while belief in God negatively influences financial satisfaction at both the individual and national levels. These findings confirm that financial satisfaction in Asian countries is not only influenced by economic factors but also by religious values and individual psychological well-being.]]>
<![CDATA[Circadian rhythm of freshwater crab Geosesarma noduliferum (De Man, 1892) under laboratory conditions ]]>
<![CDATA[Winda Eka Putri]]>;
<![CDATA[Muhammad Ridwan]]>;
<![CDATA[Tazkiana Nurul Fathiya Sofandi]]>;
<![CDATA[Nur Azizah Maulidiyah Rahmah]]>;
<![CDATA[Rika Raffiudin]]>
<![CDATA[ Jurnal Natural Vol. 26 No. 1 (2026) ]]>
Publisher : <![CDATA[Faculty of Mathematics and Natural Science (FMIPA), Universitas Syiah Kuala ]]>
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DOI: 10.24815/jn.v26i1.569
<![CDATA[Geosesarma noduliferum is a semi-terrestrial freshwater crab endemic to Java, exhibits behavioral activity potentially regulated by daily light-dark cycles. This study was aimed to analyze the circadian rhythm of this crab under laboratory conditions and examine habitat preferences during diurnal and nocturnal periods. Four individuals of 2 males and 2 female crabs were collected from their natural habitat and observed in simulated habitat tanks over three days. Behavioral observations were conducted using focal sampling during six daily sessions (three in diurnal and three nocturnal), and all activities were categorized in active or passive behaviour. The results showed that active behaviors—such as exploration, feeding, and social interaction—were more frequent and prolonged during the nocturnal period, peaking at 11:00 PM. However, passive behaviors such as resting and burial were more prevalent during diurnal. Kruskal-Wallis and Dunn tests indicated significant behavioral differences between day and night periods (p<0.05). Habitat preference also varied; both sexes favoring terrestrial areas at night; during diurnal, males predominantly occupied aquatic areas while females showed a balanced distribution. This study suggests that G. noduliferum exhibits a predominantly nocturnal activity pattern.]]>
<![CDATA[Antibiofilm activity of Gayo Arabica coffee (Coffea arabica L.) bean ethanolic extract against Pseudomonas aeruginosa and Candida albicans: in vitro and in silico studies ]]>
<![CDATA[Raisha Fathima]]>;
<![CDATA[Rima Ristianti]]>;
<![CDATA[Rizkiyah Rizkiyah]]>;
<![CDATA[Zulfitri Zulfitri]]>;
<![CDATA[Tristia Rinanda]]>
<![CDATA[ Jurnal Natural Vol. 26 No. 1 (2026) ]]>
Publisher : <![CDATA[Faculty of Mathematics and Natural Science (FMIPA), Universitas Syiah Kuala ]]>
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DOI: 10.24815/jn.v26i1.926
<![CDATA[Microbes form infectious biofilms to avoid antibiotic mechanisms, leading to the rise of antibiotic resistance. This phenomenon demands massive development of novel antibiofilm agents. Coffee plants have been investigated as antibiofilm agents despite their value as a popular export commodity. Gayo Arabica coffee, a signature product of Aceh, represents a sustainable and locally abundant natural resource. The aim of this study was to determine the antibiofilm activity of Gayo Arabica coffee bean extract against two of the most well-known biofilm producers, namely Pseudomonas aeruginosa and Candida albicans. The minimum inhibitory concentrations of the 96% ethanol-macerated coffee beans were identified against both microbes. The antibiofilm activity was evaluated based on inhibition and degradation assays. Chemical profiling of the extract was performed using Gas Chromatography-Mass Spectrometry, followed by molecular docking to assess interactions between compounds and biofilm-associated proteins in P. aeruginosa and C. albicans. The extract demonstrated antibiofilm activities against both microbes, which may be associated with the dominant compounds, particularly caffeine, hexadecanoic acid, and cis-13,16-docosadienoic acid. Caffeine had the strongest binding affinity to target proteins based on the docking analysis. This study exhibits the potent antibiofilm activity of Gayo Arabica coffee bean extract against P. aeruginosa and C. albicans. Keywords: biofilm, resistance, Pseudomonas aeruginosa, Candida albicans, Gayo coffee]]>
