cover
Article Per Year (5 Year)
All
Home Page
OAI Link
Editorial Team
Contact
Reviewer
Google Scholar
Contact Name
Rahadian Zainul
Contact Email
rahadianzmsiphd@fmipa.unp.ac.id
Phone
+6281261385385
Journal Mail Official
eksakta@ppj.unp.ac.id
Editorial Address
Jl Prof Dr Hamka Air Tawar Barat
Location
Kota padang,
Sumatera barat
INDONESIA
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 402 Documents
 34   35   36   37   38 
Influence of Species, Growing Site, and Postharvest Leaf Handling on the Yield and Chemical Composition of Cajuput Oil (Melaleuca spp.) from Seram Island, Indonesia Imanuel Berly Delvis Kapelle; Fensia Analda Souhoka; Nini Munirah Renur
EKSAKTA: Berkala Ilmiah Bidang MIPA Vol. 27 No. 03 (2026): 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/vol27-iss03/687

Abstract

Cajuput (Melaleuca spp.) is a high-value non-timber forest product in Seram Island, Maluku. The quality of cajuput oil is primarily determined by its 1,8-cineole (eucalyptol) content, which is influenced by genetic, environmental, and raw material factors. This study analyzed the effects of species, growing location, and raw material condition on the yield and chemical composition of oil derived from Melaleuca leucadendra and Melaleuca cajuputi collected from Hatusua and Eti villages, using distillation and GC-MS analysis. The results showed that fresh leaves yielded higher amounts than dried leaves. The highest yield was obtained from M. leucadendra from Eti (1.022%), while the lowest yield was recorded from dried leaves (0.008%). M. leucadendra oil was dominated by eucalyptol (56.62–58.50%), whereas M. cajuputi was dominated by methyleugenol (81.61%) with a lower yield (0.1213%), reflecting differences in genetically controlled metabolic pathways. Environmental factors influenced yield and minor compounds without altering the dominant constituents. Overall, the quality and quantity of cajuput oil are determined by the interactions among genetic, environmental, and post-harvest factors. The use of fresh raw materials, appropriate species or chemotypes, and optimal growing locations is key to improving oil quality and ensuring consistent production.   
Roselle (Hibiscus sabdariffa L.) Tea Protects Against Alcohol-Induced Renal Toxicity by Enhancing Endogenous Antioxidant Defence in Wistar Rats Putri Dafriani; Eliza Arman; Annita Annita
EKSAKTA: Berkala Ilmiah Bidang MIPA Vol. 27 No. 03 (2026): 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/vol27-iss03/688

Abstract

In Indonesia, the choice between area source and smoothed seismicity approaches has been driven by data availability rather than scientific evaluation, and no systematic comparison of both methods at the national scale has been conducted. This study compared both approaches across Indonesia to evaluate their differences in PGA estimation and assess the forecasting skill of the smoothed seismicity model. Both models were applied to the same declustered earthquake catalog with a Magnitude of Completeness of 4.7, b-value of 0.89, and a-value of 8.753, using identical Ground Motion Prediction Equations within a probabilistic seismic hazard analysis framework. Both models consistently identified North Sulawesi as the highest hazard region and Kalimantan as the lowest. The smoothed seismicity model produced higher maximum PGA values of 2.13 g compared to 1.1597 g and 1.5901 g from the area source model at 10% and 2% probability of exceedance in 50 years, respectively. Molchan Diagram validation yielded an Area Skill Score of 0.88 and R-score of 0.656, confirming strong forecasting skill. The two methods are complementary, and their integration within a logic tree framework is recommended for future national-scale PSHA in Indonesia.
A Comparative Study of Community Structure and Plankton Abundance in Seaweed Cultivation Areas in Puntondo, Takalar Regency Rafikah Amalia; Nita Rukminasari; Muh. Tauhid Umar; Irmawati Irmawati
EKSAKTA: Berkala Ilmiah Bidang MIPA Vol. 27 No. 03 (2026): 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/vol27-iss03/691

Abstract

Healthy tropical coastal waters ideally have a diverse plankton community, which serves as an indicator of optimal ecological stability. Monitoring based on the analysis of plankton community structure is required as a means of detecting changes in the ecological conditions of the waters. Given the scarcity of ecological data in this region, this study aims to analyse the community structure and abundance of plankton in the waters off Puntondo as a basis for coastal ecosystem management. Sampling was carried out at three stations using purposive sampling with a No. 25 plankton net, and the data were analysed using ecological indices and multivariate analyses (nMDS, ANOSIM and SIMPER) via PRIMER version 5. The results showed that the phytoplankton consisted of 12 species dominated by Bacillariophyceae with an abundance of 476–520 ind/L, and the zooplankton consisted of 6 species dominated by Polychaeta with an abundance of 6090–6630 ind/L; there were no significant differences between stations for either group. Moderate diversity, high evenness and low dominance indicate that the plankton community is in a state of equilibrium, reflecting that the waters of Puntondo are still capable of sustaining the plankton ecosystem despite facing anthropogenic pressures that require ongoing monitoring.
Planting Media Composition Drives Vegetative Establishment and Biomass Accumulation of Grapevine Stem Cuttings under Tropical Nursery Conditions Wisnaningsih; Moh Haris Imron S Jaya
EKSAKTA: Berkala Ilmiah Bidang MIPA Vol. 27 No. 03 (2026): 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/vol27-iss03/693

Abstract

The success of grapevine (Vitis vinifera L.) propagation through stem cuttings is strongly influenced by planting media quality during the nursery stage. Under tropical lowland conditions, unstable root-zone environments often reduce seedling vigor and biomass accumulation. Therefore, suitable manure-based media are needed to improve vegetative establishment and nursery efficiency. This study aimed to evaluate the effects of different manure-based planting media on vegetative growth and biomass accumulation of grapevine stem cuttings under tropical screen-house conditions in Bandar Lampung, Indonesia. The experiment was arranged in a randomized complete block design consisting of four treatments: M1 = sand + soil (1:1), M2 = sand + soil + cattle manure (1:1:1), M3 = sand + soil + goat manure (1:1:1), and M4 = sand + soil + chicken manure (1:1:1), with six replications. The results showed that the cattle manure-based medium consistently produced the best vegetative performance, increasing shoot length, leaf number, leaf area, fresh weight, and dry weight by 67.6%, 83.3%, 83.1%, 38.5%, and 40.4%, respectively, compared with the control treatment. Overall, cattle manure-based media provided the most favorable conditions for vegetative establishment and biomass accumulation of grapevine stem cuttings under tropical nursery conditions.  
Effects of Radiation on the Histology of the Tongue and Lip Mucosa in Rats : Preliminary Research Sagita Yudha; Aisyah Elliyanti; Eti Yerizel; Sukri Rahman
EKSAKTA: Berkala Ilmiah Bidang MIPA Vol. 27 No. 03 (2026): 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/vol27-iss03/696

Abstract

The tongue and lip mucosa, as tissues with high cell proliferation rates, are highly susceptible to injury caused by ionizing radiation. This study aimed to evaluate histological changes in the tongue and lip mucosa of rats after exposure to ionizing radiation at various doses. Nine rats were used, each consisting of three rats, divided into a negative control group (K) and three treatment groups receiving radiation doses of 13 Gy (30 seconds of radiation), 15 Gy (66 seconds of radiation), and 17 Gy (110 seconds of radiation). Samples of tongue and lip mucosa tissue were harvested after 7 days and processed for histological examination using Hematoxylin and Eosin (HE) staining at 100x objective magnification. The results of this preliminary study showed that radiation at 13 Gy caused epithelial erosion, loss of filiform papillae, subepithelial bullae formation, and acute inflammatory cell infiltration on the tongue. At 15 Gy, more extensive ulceration with subepithelial edema was observed. At 17 Gy, total epithelial loss with massive subepithelial edema and vascular dilatation occurs. This preliminary study concludes that the tongue mucosa exhibits greater radiation sensitivity than the lip mucosa, with a dose-dependent progression of damage ranging from erosion to total epithelial loss.  
Data Acquisition System for Exothermic and Endothermic Reaction: A Novel Laboratory Approach in Chemistry Learning Siti Nuryani; Ijang Rohman; Miarti Khikmatun Nais; Gun GUn Gumilar; Muhamad Nurul Hana
EKSAKTA: Berkala Ilmiah Bidang MIPA Vol. 27 No. 03 (2026): 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/vol27-iss03/697

Abstract

The determination of exothermic and endothermic reactions using conventional thermometers is often constrained by limitations in visualization and objectivity during practical activities. This study aims to investigate the performance of a DAS as an alternative for classroom practical work. The method involved characterizing thermal dynamics through a Design Science Research (DSR) approach using the MEDS evaluation framework. To record real-time temperature profiles, a thermistor sensor was integrated into the Mixer Mini and MGA as the DAS. Calcium carbide reaction and urea dissolution were utilized as the thermochemical systems. The analysis results show that the DAS: (1) is capable of detecting phenomena that go undetected using conventional methods; (2) exhibited strong baseline stability during the pre-reaction phase with a slope approaching zero and high reliability under homogeneous conditions, indicated by RSD values of 0.45% and 3.44% for urea dissolution and the calcium carbide-water reaction, respectively; and (3) showed stable internal consistency despite deviations from literature values caused by external factors. The novelty of this research lies in the operational efficiency of a self-contained measurement system that operates without the need for coding procedures. Consequently, the DAS provides a practical, objective, and scientifically valid solution to enhance data integrity in thermochemical analyses.
Synthesis of Nano alfa-Cellulose-Based Bioplastic from Empty Fruit Bunches of Palm Oil Benny Rio Fernandez; Rycce Sylviana Pratikha; Sari Farah Dina; Poltak Evencus Hutajulu; Gimelliya Saragih; Dafina Ariza; Indah Fitri Ramadhani; Yosef Boy Wijaya Sinaga
EKSAKTA: Berkala Ilmiah Bidang MIPA Vol. 27 No. 03 (2026): 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/vol27-iss03/700

Abstract

Cellulose, as a renewable resource, has recently emerged as a primary focus for researchers aiming to develop sustainable biomaterials.  FTIR spectra show that there is no significant difference between them. Apparently, the significant absorption band of cellulose structure at 3300 cm-1 (O-H stretching), 2900 cm-1 (C-H stretching), and at 1022 cm-1 (OCH-O-CH2 cellulose framework). SEM images revealed that changing the surface morphology of the a-cellulose (fibril-shaped) to nano a-cellulose (rod-shaped) resulted in average fiber diameters of 3.07 µm and 2.80 µm, respectively. Particle size distribution of the suspended particles after acid and sonication treatment becomes 380.79 nm. Based on the DTA results, the obtained products have good thermal stability, which decomposes at a temperature 290 oC.　Furthermore, nano a-cellulose was used as a starting material to generate biodegradable plastic with the addition of silica as a filler and glycerin as a plasticizer. Mechanical tests of bioplastics, such as tensile strength, elongation, and modulus of elasticity, show that silica can improve the properties of bioplastics. Finally, the elongation properties of bioplastics meet the Indonesian National Standard (SNI) requirements; however, the tensile strength and modulus of elasticity values require further experiments.
Analysis of Fault Plane and Distribution of Coulomb Stress Changes of the Mw 7.8 Earthquake Southwest of Sumatra Gabriela Gabriela; Kelly Lasofia Br Girsang; Rizki Wulandari Wulandari; Yudha Styawan
EKSAKTA: Berkala Ilmiah Bidang MIPA Vol. 27 No. 03 (2026): 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/vol27-iss03/701

Abstract

The Mw 7.8 earthquake that occurred southwest of Sumatra on March 2, 2016, at a depth of 24 km represents a major seismic event within the Sunda subduction zone, significantly influencing regional stress conditions. This study aims to analyze Coulomb stress changes (Δσc), examine stress distribution patterns, and evaluate the most representative fault plane controlling the earthquake source mechanism. The analysis was conducted using the Coulomb Stress Change method based on focal mechanism parameters and finite fault models obtained from the United States Geological Survey (USGS). The results indicate that Nodal Plane 1 (NP1) represents the true fault plane controlling the earthquake mechanism, with maximum stress increase of up to  0.1 bar and orientations from west–east to northwest–southeast. In contrast, Nodal Plane 2 (NP2) acts as a receiver fault, accommodating transferred stress from the main rupture, with similar stress magnitudes oriented north–south to west–east. The observed stress increases on both nodal planes highlight potential zones for aftershock occurrence. This study contributes to a better understanding of earthquake source mechanisms and stress redistribution patterns that may trigger subsequent seismic activity in the southwest  region of Sumatra..
Fluid Flow Analysis in Cisarua Hot Spring, South Lampung: A Study Using Geoelectric and Induced Polarization Methods Fadhiah Nurul Aini; Joan Margareth Sihol Marito S; Selvi Misnia Irawati
EKSAKTA: Berkala Ilmiah Bidang MIPA Vol. 27 No. 03 (2026): 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/vol27-iss03/703

Abstract

Characterization of subsurface hydrothermal fluid flow pathways is essential for exploration and sustainable development of fault-controlled, non-volcanic geothermal systems. The Cisarua Hot Spring in Natar District, South Lampung, is a non-volcanic geothermal system controlled by the northwest-southeast trending Lampung–Panjang Fault; however, the hydraulic connectivity between the old well and new well manifestations has not been previously demonstrated geophysically. This study presents the first integrated Electrical Resistivity Tomography (ERT) and Induced Polarization (IP) investigation to map subsurface connectivity between both manifestation sources, aiming to identify hydrothermal fluid pathways and determine the hydraulic interconnection between the two wells. A Wenner–Schlumberger survey was conducted along four 235 m measurement lines with a maximum investigation depth of 44.65 m. Inversion results identify two principal lithologies: tuffaceous clay (resistivity <20 Ωm) and tuffaceous sand (20–33.6 Ωm). Zones of low resistivity coupled with elevated chargeability (>20 ms) on profiles 1 and 3 indicate active hydrothermal fluid pathways structurally controlled by the Lampung–Panjang Fault, with hydrothermally altered clay forming a confining layer above the reservoir. Results confirm that both wells constitute a single, internally connected hydrothermal system linked by a northwest-southeast trending fluid migration pathway along the fault zone.
Characterization and Quality Analysis of Puff Pastry Made with Corn-Based Dough Anni Faridah; Juliana Siregar; Rahmi Holinesti; Ranggi Rahimul Insan; Wiwik Indrayeni; Fitriyasih Fitriyasih; Ade Raimuna
EKSAKTA: Berkala Ilmiah Bidang MIPA Vol. 27 No. 03 (2026): 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/vol27-iss03/705

Abstract

This study aimed to analyze the dough characteristics and quality of puff pastry with corn flour as a partial substitute for wheat flour. The use of local ingredients such as corn is important for supporting food diversification and developing healthier bakery products. An experimental method compared a control puff pastry made with 100% wheat flour and a formulation containing corn flour substitution. Samples were evaluated through microscopic observation, Scanning Electron Microscopy (SEM), and nutritional analysis. The results showed that corn flour substitution affected the properties of puff pastry. Microscopic observations indicated that the substituted product had higher porosity and less distinct layer formation than the control, especially on the first day after baking. During storage, the corn-based puff pastry exhibited an increase in hollow structures, indicating changes in internal morphology. SEM analysis confirmed differences in microstructure, with the control sample displaying smoother, clearly defined layers, whereas the substituted sample showed a more porous and irregular structure. Nutritional analysis revealed that corn substitution increased moisture, ash, and protein contents while decreasing fat and carbohydrate levels compared with the control. Overall, corn flour substitution influenced puff pastry texture and composition while demonstrating potential for developing nutritious bakery products from locally available ingredients

Page 36 of 41 | Total Record : 402

 34   35   36   37   38 

Filter by Year

2017 2026


Reset
Filter By Issues
All Issue Vol. 27 No. 04 (2026): Eksakta : Berkala Ilmiah Bidang MIPA (E-ISSN : 2549-7464) In Progress Vol. 27 No. 03 (2026): Eksakta : Berkala Ilmiah Bidang MIPA (E-ISSN : 2549-7464) In Progress Vol. 27 No. 03 (2026): Eksakta : Berkala Ilmiah Bidang MIPA (E-ISSN : 2549-7464) Vol. 27 No. 02 (2026): Eksakta : Berkala Ilmiah Bidang MIPA (E-ISSN : 2549-7464) Vol. 27 No. 01 (2026): Eksakta : Berkala Ilmiah Bidang MIPA (E-ISSN : 2549-7464) Vol. 26 No. 04 (2025): Eksakta : Berkala Ilmiah Bidang MIPA (E-ISSN : 2549-7464) Vol. 26 No. 03 (2025): Eksakta : Berkala Ilmiah Bidang MIPA (E-ISSN : 2549-7464) Vol. 26 No. 02 (2025): Eksakta : Berkala Ilmiah Bidang MIPA (E-ISSN : 2549-7464) Vol. 26 No. 01 (2025): Eksakta : Berkala Ilmiah Bidang MIPA (E-ISSN : 2549-7464) Vol. 25 No. 04 (2024): Eksakta : Berkala Ilmiah Bidang MIPA (E-ISSN : 2549-7464) Vol. 25 No. 03 (2024): Eksakta : Berkala Ilmiah Bidang MIPA (E-ISSN : 2549-7464) Vol. 25 No. 02 (2024): Eksakta : Berkala Ilmiah Bidang MIPA (E-ISSN : 2549-7464) Vol. 25 No. 01 (2024): Eksakta : Berkala Ilmiah Bidang MIPA (E-ISSN : 2549-7464) Vol. 24 No. 04 (2023): Eksakta : Berkala Ilmiah Bidang MIPA (E-ISSN : 2549-7464) Vol. 24 No. 03 (2023): Eksakta : Berkala Ilmiah Bidang MIPA (E-ISSN : 2549-7464) Vol. 24 No. 02 (2023): Eksakta : Berkala Ilmiah Bidang MIPA (E-ISSN : 2549-7464) Vol. 24 No. 01 (2023): Eksakta : Berkala Ilmiah Bidang MIPA (E-ISSN : 2549-7464) Vol. 23 No. 04 (2022): Eksakta: Berkala Ilmiah Bidang MIPA (E-ISSN : 2549-7464) Vol. 23 No. 03 (2022): Eksakta: Berkala Ilmiah Bidang MIPA (E-ISSN : 2549-7464) Vol. 23 No. 02 (2022): Eksakta : Berkala Ilmiah Bidang MIPA (E-ISSN : 2549-7464) Vol. 23 No. 01 (2022): Eksakta : Berkala Ilmiah Bidang MIPA (E-ISSN : 2549-7464) Vol. 23 No. 04 (2022): Eksakta: Berkala Ilmiah Bidang MIPA Vol. 22 No. 4 (2021): Eksakta : Berkala Ilmiah Bidang MIPA (E-ISSN : 2549-7464) Vol. 22 No. 3 (2021): Eksakta : Berkala Ilmiah Bidang MIPA (E-ISSN : 2549-7464) Vol. 22 No. 2 (2021): Eksakta : Berkala Ilmiah Bidang MIPA (E-ISSN : 2549-7464) Vol. 22 No. 1 (2021): Eksakta : Berkala Ilmiah Bidang MIPA (E-ISSN : 2549-7464) Vol. 21 No. 2 (2020): Eksakta : Berkala Ilmiah Bidang MIPA (E-ISSN : 2549-7464) Vol. 21 No. 1 (2020): Eksakta : Berkala Ilmiah Bidang MIPA (E-ISSN : 2549-7464) Vol. 20 No. 2 (2019): Eksakta : Berkala Ilmiah Bidang MIPA (E-ISSN : 2549-7464) Vol. 20 No. 1 (2019): Eksakta : Berkala Ilmiah Bidang MIPA (E-ISSN : 2549-7464) Vol. 19 No. 2 (2018): Eksakta : Berkala Ilmiah Bidang MIPA (E-ISSN : 2549-7464) Vol. 19 No. 1 (2018): Eksakta : Berkala Ilmiah Bidang MIPA (E-ISSN : 2549-7464) Vol. 18 No. 02 (2017): Eksakta : Berkala Ilmiah Bidang MIPA (E-ISSN : 2549-7464) Vol. 18 No. 01 (2017): Eksakta : Berkala Ilmiah Bidang MIPA (E-ISSN : 2549-7464) More Issue