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Eksakta : Berkala Ilmiah Bidang MIPA
Published by Universitas Negeri Padang
ISSN : -     EISSN : 25497464     DOI : https://doi.org/10.24036/eksakta/
Core Subject : Science, Education, Agriculture, Social, Engineering,
Agriculture, Biological Sciences & Forestry Astronomy Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Energy Engineering Environmental Science Materials Science & Nanotechnology Mathematics Mechanical Engineering
Eksakta : Berkala Ilmiah Bidang MIPA (E-ISSN : 2549-7464) is an open access journal and peer-reviewed that publishes either original article or reviews. The journal is dedicated towards dissemination of knowledge related to the advancement in scientific research. The prestigious interdisciplinary editorial board reflects the diversity of subjects covered in this journal. Under the realm of science and technology, the coverage includes environmental science, pure and applied mathematics, agricultural research and engineering, biology, biotechnology, bioinformatics, Healthcare sciences (including clinical medicine, preventive medicine & public health), physics, biophysics, computer science, chemistry and bioengineering, to name a few. This Journal Is Published at 3 Month intervals on January-Marc, April-June, July-September and October-December
Arjuna Subject : Umum - Umum
Articles 310 Documents
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Histopathology of Gills Fish in Rivers Contaminated by Heavy Metals from Artisanal Gold Mining Waste in Lebong Regency, Bengkulu Province Lestari, Dian Fita; Vestidhia Yunisya Atmaja; Santi Nurul Kamilah; Eliza Febrianti; Farisa Retno; Hengki Turnando; Ibranio Risditama
EKSAKTA: Berkala Ilmiah Bidang MIPA Vol. 26 No. 02 (2025): Eksakta : Berkala Ilmiah Bidang MIPA (E-ISSN : 2549-7464)
Publisher : Faculty of Mathematics and Natural Sciences (FMIPA), Universitas Negeri Padang, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/eksakta/vol26-iss02/588

Abstract

The aquatic environment is crucial for fish survival because fish require appropriate aquatic environment. Artisanal gold mining generates heavy metal waste in Lebong Regency, polluting the river flows. Heavy metals released into the aquatic environment generate water pollution problems due to their toxicity, persistence, and bio-accumulation in organism. The aim of this study was to investigate the histology of fish gill organs in the river contamined by heavy metals. Fish samples were taken by purposive sampling. Histological sections using the paraffin method and hematoxylin-eosin staining. The result of mercury detected in water is 0.01mg/L, exceeded maximum limit in river based on class II water quality standard (0.002mg/L). Histopathology of gills H. nemurus and T. Tricopterus fish (HAI scores <20) showed slight alterations such as epithelial lifting, secondary lamella fusion, and hyperplasia. Rasbora sp., M.circumcinctus, and O.niloticus gills fish (HAI scores>100) had severe irreversible damage, marked by telangiectasis at the tips of the secondary lamella. This is due to the presence of heavy metal contaminants in the water, that causes histopathological damage to fish gills. Parasitic infections were also discovered in some fish gills, impairing their function for respiratory and excretory organs which can be caused by low water quality.
The Impact of Biofloc on Fish Growth Indicators and Health Risks Assesment from Polyethylene Terephthalate Microplastic Contamination Afriani, Dian Rizky; Deswati; Rahmiana Zein
EKSAKTA: Berkala Ilmiah Bidang MIPA Vol. 26 No. 02 (2025): Eksakta : Berkala Ilmiah Bidang MIPA (E-ISSN : 2549-7464)
Publisher : Faculty of Mathematics and Natural Sciences (FMIPA), Universitas Negeri Padang, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/eksakta/vol26-iss02/594

Abstract

This study aims to evaluate the effects of biofloc technology on the growth performance of Nile tilapia (Oreochromis niloticus) and to assess potential health risks associated with polyethylene terephthalate (PET) microplastic contamination in aquaculture systems. Three treatments were applied: aquaculture without biofloc and microplastics, aquaculture with biofloc but without microplastics, and aquaculture with biofloc combined with PET microplastics. The novelty of this research lies in the integration of biofloc technology with a quantitative health risk assessment approach aspect that has received limited attention in previous studies. Furthermore, this study specifically utilizes PET microplastics, which differ in physicochemical properties and toxicological potential from the commonly studied polyethylene (PE) microplastics. The results revealed that the best performance was observed in the treatment with biofloc but without microplastics, showing an average body weight (ABW) of 5.478 g/fish, an average daily gain (ADG) of 2.343 g/fish/day, and a specific growth rate (SGR) of 4.208%. In terms of health risk, this treatment also demonstrated low to moderate risk levels, with a Polymer Load Index (PLI) of 2.53, a Potential Health Index (PHI) of 11, and a Potential Ecological Risk Index (PERI) of 10. These findings indicate that biofloc technology is not only effective in enhancing fish growth performance but also contributes to mitigating the adverse impacts of microplastic contamination on fish health and food safety in aquaculture systems.
The Effect of Ginger (Zingiber officinale) Extract Addition on The Characteristics of Chayote (Sechium edule (Jacq.) Sw.) Syrup Amelia, Kharisma; Sylvi, Diana; Sayuti, Kesuma
EKSAKTA: Berkala Ilmiah Bidang MIPA Vol. 26 No. 02 (2025): Eksakta : Berkala Ilmiah Bidang MIPA (E-ISSN : 2549-7464)
Publisher : Faculty of Mathematics and Natural Sciences (FMIPA), Universitas Negeri Padang, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/eksakta/vol26-iss02/600

Abstract

This study aimed to evaluate the effect of adding ginger (Zingiber officinale) extract on the physical, chemical, microbiological, and sensory properties of chayote (Sechium edule) syrup, a potential functional drink developed from local agricultural produce. The research was designed using a Completely Randomized Design (CRD) with five levels of ginger extract addition (0%, 10%, 20%, 30%, and 40%) and three replications. Data were analyzed using Analysis of Variance (ANOVA), and Duncan’s New Multiple Range Test (DNMRT) at a 5% significance level was applied when significant differences were detected. The results showed that increasing the concentration of ginger extract significantly improved syrup viscosity (up to 1568.67 cP), phenol content (up to 45.65 mg GAE/g), and antioxidant activity (up to 46.03%), while reducing TPC to 2.7×10² CFU/g. The most preferred formulation was at 30% ginger extract addition, yielding a product with desirable sensory qualities and balanced composition. Color analysis using °Hue showed a shift towards deeper yellow tones, although this was not statistically significant. High viscosity contributes to better texture and product stability, while elevated phenol and antioxidant content enhance the health-promoting potential of the syrup. These attributes are essential in designing functional beverages. 
Land Cover Change Prediction Modeling in Tanjungpinang City in 2043 Arie Afriadi; Nefriwati Hilmi; Hoki Apriyenson; Zuleriwati AS
EKSAKTA: Berkala Ilmiah Bidang MIPA Vol. 26 No. 03 (2025): Eksakta : Berkala Ilmiah Bidang MIPA (E-ISSN : 2549-7464)
Publisher : Faculty of Mathematics and Natural Sciences (FMIPA), Universitas Negeri Padang, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/eksakta/vol26-iss03/604

Abstract

Land cover changes reflect the pressure of development and increased human activities that have an impact on environmental imbalance. As a strategic coastal city, Tanjungpinang faces challenges in maintaining the sustainability of its regional ecosystem. This study aims to analyze the dynamics of land cover changes and predict their conditions until 2043 using remote sensing technology and geographic information systems (GIS), incorporating Cellular Automata and logistic regression methods. The results of the study showed that land cover changes between 2003 and 2023 increased built-up area by 27.15 km² and decreased Vegetation by 14.02 km². Bare Land increased by 1.45 km² at the beginning of the period, then reduced to a total of 12.74 km². Water bodies decreased by 0.39 km². Predictions for 2043 indicate that built-up area increased by 5.12 square kilometres, while Vegetation decreased by 6.33 square kilometres. Bare land increased by 1.34 km², while water bodies declined by 0.14 km². This pattern indicates a trend of converting vegetative land into built-up areas due to the increasing demand for regional space.
A Smart Web Application for Real-Time Indoor Temperature and Humidity Monitoring Hasbi, M. Hasbi Sidqi Alajuri; Hollanda Arief Kusuma; Marisha Pertiwi; Tonny Suhendra; Gilang Satria Wahyu Dewantara
EKSAKTA: Berkala Ilmiah Bidang MIPA Vol. 26 No. 03 (2025): Eksakta : Berkala Ilmiah Bidang MIPA (E-ISSN : 2549-7464)
Publisher : Faculty of Mathematics and Natural Sciences (FMIPA), Universitas Negeri Padang, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/eksakta/vol26-iss03/606

Abstract

Learning comfort is influenced by the environment, including temperature and humidity. This study validates the temperature and humidity monitoring device (DHT 22) in the dashboard system of the Department of Electrical Engineering. The results show high accuracy, with 98.96% for temperature and 98.93% for humidity, and an average error rate of 1.04%. Validation was conducted at BMKG Tanjungpinang for four days, with data recorded every minute for 24 hours. User satisfaction evaluation using the System Usability Scale (SUS) yielded an average score of 57, categorized as "Not Acceptable." Nevertheless, users still provided relatively positive feedback. These findings emphasize the need for improvements in dashboard design, user experience, and additional training. Recommendations include utilizing third-party platforms and evaluating the hardware and interface to enhance system usability.
Isolation and Characterization of Flavonoid from Mimosa pudica Muhamad Afham; Hendra, Rudi; Teruna, Hilwan Yuda
EKSAKTA: Berkala Ilmiah Bidang MIPA Vol. 26 No. 03 (2025): Eksakta : Berkala Ilmiah Bidang MIPA (E-ISSN : 2549-7464)
Publisher : Faculty of Mathematics and Natural Sciences (FMIPA), Universitas Negeri Padang, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/eksakta/vol26-iss03/608

Abstract

Indonesia has a rich biodiversity, including the putri malu plant (Mimosa pudica L.) which is known to have secondary metabolites with medicinal potential but has not been fully utilized. The purpose of this work is to isolate and analyze secondary metabolites from M. pudica. The aerial portions were dried and macerated in methanol before being partitioned using n-hexane, dichloromethane, and ethyl acetate solvents. The ethyl acetate extract was separated using liquid vacuum chromatography, then recrystallized and purity tested (KLT, melting point, and HPLC). The chemical structure was characterized using UV-Vis, FTIR, and NMR (1H and 13C) spectroscopy. One of the 17 fractions generated pure yellow crystals with a melting point of 242-244°C and single prominent peak on HPLC. The study revealed that the chemical was quercetin, a flavonoid with a variety of biological functions. This study demonstrates that M. pudica include active flavonoid compounds that can supportaid in the development of herbal medications based on natural ingredients. These findings lay the groundwork for additional research into its bioactivity and pharmacological potential, particularly as an antidiabetic drug and antioxidant.
Non-Destructive Evaluation Quality of Oil Palm Fresh Fruit Bunch (FFB) (Elaeis guineensis Jacq.) Using Thermal Imaging in the Grading Process Sirtin, Ardillah Anggraini; Makky, Muhammad; Santosa, Santosa; Cherie, Dinah
EKSAKTA: Berkala Ilmiah Bidang MIPA Vol. 26 No. 03 (2025): Eksakta : Berkala Ilmiah Bidang MIPA (E-ISSN : 2549-7464)
Publisher : Faculty of Mathematics and Natural Sciences (FMIPA), Universitas Negeri Padang, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/eksakta/vol26-iss03/611

Abstract

Determining the quality of oil palm Fresh Fruit Bunches (FFB) quickly and accurately is very important in the grading process to ensure the quality of production results and the efficiency of the post-harvest process. This study aims to evaluate the quality of oil palm FFB non-destructive using thermal image technology, focusing on two main parameters: moisture content and oil content. The oil palm FFB used was the Tenera variety. Thermal characteristic data were obtained from the RGB pseudo color thermal images and the oil palm FFB temperature. The model obtained using Artificial Neural Network (ANN) showed that the calibration model for moisture content produced a linear regression equation y = 0.9826x + 0.7159 (R² = 0.9827), and for oil content y = 0.9962x + 0.0289 (R² = 0.9973). At the validation stage, the moisture content prediction model gave y = 0.9056x + 10.721 (R² = 0.8908), and oil content y = 0.7683x + 1.6494 (R² = 0.8567). These results indicated that thermal imaging technology has great potential as an efficient and accurate non-destructive method in evaluating the quality of oil palm FFB, especially in supporting a more objective and sustainable grading system.  
Study on Color Properties of Auricularia auricula-judae (Bull.) Quél. Affected by Nano Edible Coatings, Packaging Types, and Storage Temperatures Kusumiyati, Kusumiyati; Rachman, Aulia Afifah; Hamdani, Jajang Sauman
EKSAKTA: Berkala Ilmiah Bidang MIPA Vol. 26 No. 03 (2025): Eksakta : Berkala Ilmiah Bidang MIPA (E-ISSN : 2549-7464)
Publisher : Faculty of Mathematics and Natural Sciences (FMIPA), Universitas Negeri Padang, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/eksakta/vol26-iss03/614

Abstract

Wood ear mushroom is a traditional edible and medicinal mushroom widely consumed as a food supplement. The color of the fruit body is a crucial indicator of commercial quality that influences consumer purchasing interest. However, color quality can decrease due to inappropriate post-harvest technology. The application of nano edible coating, packaging, and storage temperature can help maintain color stability during storage. This study aims to determine the effect of nano edible coating, packaging, and storage temperature on the color of wood ear mushrooms based on the parameters L*, a*, b*, Chroma, Hue, Browning Index, and color difference. The experimental design used was a Completely Randomized Design (CRD) with a combination of nano edible coating (sodium alginate and aloe vera), packaging (biodegradable, wrap, and vacuum plastic), and storage temperatures (±25 ℃, 10 ℃, and 5 ℃). Each treatment was repeated twice, resulting in 38 experimental units, each consisting of 3 mushrooms, total of 114 mushrooms. The results showed that nano aloe vera with vacuum packaging at a storage temperature of 5 ℃ provided the best results in maintaining the color of the wood ear mushroom during storage, with the lowest lightness and color difference values.
Optimizing Copper-Aluminum Photovoltaic Cells with Sodium Chloride Gel Electrolyte Under Neon Lamp Ilumination: A Comprehensive Review Chandra, Dhea Nurfadilla; Mohammad Abdullah; Adhan Efendi; Ilham Saputra
EKSAKTA: Berkala Ilmiah Bidang MIPA Vol. 26 No. 03 (2025): Eksakta : Berkala Ilmiah Bidang MIPA (E-ISSN : 2549-7464)
Publisher : Faculty of Mathematics and Natural Sciences (FMIPA), Universitas Negeri Padang, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/eksakta/vol26-iss03/582

Abstract

Photovoltaic cells are devices capable of converting light energy into electrical energy through the photovoltaic effect, where absorbed photons in semiconductor materials generate an electric current. Ideally, photovoltaic cells should offer high efficiency, long-term stability, and low production costs under various lighting conditions. In reality, most conventional photovoltaic technologies, such as crystalline silicon, still suffer from high production costs and performance degradation, especially under long-term exposure and high humidity. As an alternative, copper-aluminum (Cu-Al) based photovoltaic cells with sodium chloride (NaCl) gel electrolyte have been developed, providing reasonable energy conversion efficiency, low material costs, and simple fabrication. The NaCl gel enhances ionic conductivity and system stability, while calcination of Cu into CuO improves the semiconductor properties of the active layer. The urgency of this research lies in the need for renewable energy systems that are affordable, easy to produce, and durable, particularly for remote areas or off-grid applications. Therefore, this article aims to provide a comprehensive review of the optimization of Cu-Al photovoltaic cells with NaCl gel electrolyte under neon lamp illumination, highlighting technical challenges, performance enhancement mechanisms, and future development prospects. This article includes references from publications between 2019 and 2025.
Molecular Insights into Acne Vulgaris: A Multi-Omics Approach Towards Precision Medicine Ikawati, Hartanti Dian; Fadilah; Fitria Agustina
EKSAKTA: Berkala Ilmiah Bidang MIPA Vol. 26 No. 03 (2025): Eksakta : Berkala Ilmiah Bidang MIPA (E-ISSN : 2549-7464)
Publisher : Faculty of Mathematics and Natural Sciences (FMIPA), Universitas Negeri Padang, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/eksakta/vol26-iss03/591

Abstract

Acne vulgaris is a common dermatological disorder that significantly impacts quality of life, yet its complex pathogenesis remains incompletely understood, contributing to the variability in clinical presentation and treatment response. This review summarizes recent advances in omics-based research on acne vulgaris and explores how these findings support the development of targeted therapy. A systematic literature search was conducted in PubMed using the keywords “acne genomic,” “acne transcriptomic,” “acne proteomic,” and “acne metabolomic.” Original research articles published in English, available in full text, and published between 2015 and 2025 were included. After screening for relevance and removing duplicates, 17 studies met the inclusion criteria. Additional relevant articles were also referenced to complement the discussion. The selected studies show that large-scale molecular analysis provides a more comprehensive understanding of the molecular mechanisms underlying acne vulgaris. These findings enable the identification of novel biomarkers, better insight into pathological pathways, and the development of more targeted therapeutic strategies. Further studies are needed to validate these findings and translate them into improved strategies for the diagnosis, prevention, and treatment of acne vulgaris.

Page 29 of 31 | Total Record : 310

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