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Jurnal Natural
ISSN 1411-8513 · Universitas Syiah Kuala, Faculty of Mathematics and Natural Science · 395 articles in the index
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Journal Article
The relationship between religiosity level and financial satisfaction in Asian countries with multilevel modeling
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…
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Journal Article
Circadian rhythm of freshwater crab Geosesarma noduliferum (De Man, 1892) under laboratory conditions
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…
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Journal Article
Determinants of the Regional Innovation Index in the VUCA Era: A Robust Regression MM-Estimation Approach
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…
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Journal Article
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)
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…
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Journal Article
Antibiofilm activity of Gayo Arabica coffee (Coffea arabica L.) bean ethanolic extract against Pseudomonas aeruginosa and Candida albicans: in vitro and in silico studies
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…
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Journal Article
Optimization of growth rate and feeding efficiency of four economically important in the bioflocs system
Abstract. Research and development of biofloc aquaculture system until now only in the range of 14-15 species conducted. Even though this technology is able to increase production several times compared to conventional systems, so it is necessary to diversify species that allow development…
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Journal Article
The immunostimulant effect of jamblang stem bark (Syzygium cumini L.) ethanol extract against mice macrophages phagocytosis activity and capacity
This study aims to determine the effect of administering Jamblang Stem Bark Ethanol Extract (Syzygium cumini L.) (JSBEE) on the activity and phagocytosis capacity of macrophages in mice (Mus musculus) infected with Staphylococcus aureus bacteria. The research method used a completely randomized…
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Journal Article
Biodegradation of Diisobutyl Phthalate using Fungi Plastisphere Isolated from Plastic Waste in Mangrove Kadilangu Area
Diisobutyl phthalate, an additive in plastic production belonging to the group of xenobiotic substances, has a negative impact on human health, especially on the reproductive system. In Indonesia, the presence of plastisphere fungi is often used as a degrading agent for xenobiotic substances…
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Journal Article
Assessing the water quality in the Timbalun river watershed, Padang City, West Sumatra, Indonesia
The purpose of this study is to assess water quality, specifically pH, conductivity, total dissolved solids (TDS), salinity, and turbidity. The research utilizes quantitative methods and covers 15 sampling points across the Timbalun River basin in Padang City, West Sumatra, Indonesia. Samples were…
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Journal Article
Effect of mulch and liquid organic fertilizer on shallot production (Allium cepa)
Shallot (Allium cepa) is an economically valuable and highly nutritious crop whose productivity can be increased through optimal cultivation practices. This study investigated the combined effects of mulch and liquid organic fertilizer (LOF) on onion yield and performance. A factorial randomized…
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Journal Article
Analysis of particle dynamics, event horizon, and thermodynamic properties of black holes in the Ghasemi-Nodehi-Bambi metric
Black holes, as complex astrophysical objects, are strongly influenced by their metric parameters. This research focuses on the Ghasemi-Nodehi-Bambi (G-N-B) metric, an extension of the Kerr solution, which introduces additional parameters to more accurately describe the properties of black holes…
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Journal Article
Analysis of VAE-LSTM Performance in Detecting Anomalies in Average Daily Temperature Data in Jakarta 2000-2023
Climate change is happening worldwide, so global climate conditions are a major concern. In densely populated urban areas such as Jakarta, it is impossible to avoid the impacts of climate change, particularly the daily changes in air temperature. Therefore, a sophisticated and efficient approach is…
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Journal Article
Species and index diversity of macrofungi from two different locations in East Kalimantan
East Kalimantan represents the lowland rainforest ecosystem with a vast number of macrofungi species in Indonesia. This study aimed to evaluate the diversity of macrofungi within the two different locations in East Kalimantan. The study was conducted in several phases, including planning, survey…
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Journal Article
Effect of seed priming on the germination of upland rice (Oryza sativa L.) sown in acidic soil
Upland rice is a type of rice that can be grown in Ultisol. The obstacles to cultivating plants in Ultisol are low pH and high aluminum content which hinders seed germination. Seed priming is a technology that can overcome problems with Ultisol. The aim of this research was to determine the effect…
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Journal Article
Microbiological and urinalysis assessment of UTIs in COVID-19 patients at Dr. Zainoel Abidin Hospital, Banda Aceh.
One of the secondary infections observed among COVID-19 patients is a Urinary Tract Infection (UTI). The presence of bacteria and fungi causes UTI, which can certainly occur after a urine culture. Urinalysis is one of the critical examinations to diagnose UTIs and assess functional disorders in the…
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Journal Article
Biosynthesis of silver nanoparticles with antioxidant activity using Mesona palustris Bl. leaf water extract
Mesona palustris Bl. has considerable potential. Still, it has yet to be matched by its utilization in nanotechnology, especially nanoparticles (1-100 nm), which have superior physicochemical properties and activities. This laboratory study aims to determine the potential of of Mesona palustris Bl…
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Journal Article
A station-scale modeling framework for heavy rainfall classification in tropical weather using representative machine learning approaches
Extreme daily rainfall in rapidly urbanizing tropical cities frequently overwhelms drainage and disrupts critical services, yet station-scale forecasting remains limited by convective variability and sparse observations. This motivates lightweight, interpretable machine-learning tools that operate…
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Journal Article
In silico characterization of adh1 gene encoding alcohol dehydrogenase 1 (ADH1) from non-conventional yeast, Wickerhamomyces and Pichia spp
Wickerhamomyces anomalus and Pichia kudriavzevii have high potential to produce bioethanol under high stress condition, due to their stress-tolerant properties. To elucidate and develop an efficient and sustainable bioethanol production, characterization of ethanol fermentation reactions is highly…