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Jurnal Ilmiah Sains
Published by Universitas Sam Ratulangi
ISSN : 14123770     EISSN : 25409840     DOI : https://doi.org/10.35799/jis.v22i2.40961
Core Subject : Science, Education, Agriculture,
Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Chemistry Computer Science & IT Mathematics Physics
Jurnal Ilmiah Sains (Journal of Scientific Sciences) is the Journals Published by Faculty of Mathematics and Natural Sciences, Sam Ratulangi University. Jurnal Ilmiah Sains Published Twice a Year, i.e April and October. Jurnal Ilmiah Sains  welcomes full research articles in the area of Mathematics and Natural Sciences from the following subject areas: Mathematics Statistics Computer Science Physics Chemistry Biology
Arjuna Subject : Umum - Umum
Articles 355 Documents
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Hydrogeophysical Characterization of Volcanic Aquifers Using Integrated Resistivity and Induced Polarization in Mount Tumpa, Manado As'ari As'ari; Seni Herlina J. Tongkukut; Mahendra Kusuma Nugraha
Jurnal Ilmiah Sains Volume 26 Issue 1, April 2026
Publisher : Sam Ratulangi University, Manado, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35799/jis.v26i1.65145

Abstract

This study investigates the aquifer system in the Mount Tumpa area, North Sulawesi, Indonesia, using integrated electrical resistivity and induced polarization (IP) methods. Data were acquired with a dipole–dipole array, enabling high lateral resolution of subsurface heterogeneity. Resistivity inversion was used to delineate aquifer geometry, while IP data were analyzed to identify zones of enhanced electrochemical polarization related to lithological and mineralogical variations. Aquifer zones are characterized by low resistivity values (< 9.17 Ωm). On Line 1, an aquifer is identified at 100–130 m and depths of 15–25 m; on Line 2, at 215–230 m and depths of 10–20 m. On Line 3, three distinct aquifer units are resolved: (1) 150–175 m at depths ≥ 75 m, (2) 220–235 m at 30–40 m, and (3) 285–305 m at 35–45 m. These findings indicate a multi-layered groundwater system with variable depth distribution. Chargeability responses are high on Lines 1 and 3 and moderate on Line 2, suggesting the presence of polarizable materials such as volcanic clay, iron oxides, and organic-rich layers. These materials may influence groundwater geochemical behavior through adsorption and redox processes; however, IP responses do not directly indicate groundwater quality in the absence of hydrochemical data. The subsurface is interpreted as a layered volcanic aquifer system, where groundwater is primarily hosted in permeable lapilli and volcanic ash deposits overlying compact lava, with additional storage in fractured lava zones. The identified aquifers are interpreted as shallow to intermediate systems based on geophysical evidence, although further hydrogeological validation is required. Keywords: resistivity method; induced polarization; chargeability; Mount Tumpa; aquifer characterization
Frequency-Dependent Magnetic Susceptibility of Sediments of Lake Tondano, Minahasa, North Sulawesi Vistarani Arini Tiwow; Meytij Jeanne Rampe; Ishak Pawarangan; Muhammad Arsyad; Sayenne Givenshe Pungus; Gita Gratia Patris Nangka; Igreya Mitchell Kumendong; Oksan Prasetio Mundiahi
Jurnal Ilmiah Sains Volume 26 Issue 1, April 2026
Publisher : Sam Ratulangi University, Manado, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35799/jis.v26i1.65698

Abstract

A study has been conducted on frequency-dependent magnetic susceptibility in sediments of Lake Tondano, Minahasa, North Sulawesi. This study aims to analyze the types of minerals, grain sizes, and magnetic domains in sediment samples of Lake Tondano. The method used is the rock magnetism method, specifically the magnetic susceptibility parameters. Magnetic susceptibility measurements used a Bartington susceptibility meter that works at two frequencies, namely 470 Hz and 4700 Hz. The results obtained are sediment samples are indicated to contain ferrimagnetic minerals. The grain size distribution in sediment samples is predominantly fine <0.03 µm. The frequency-dependent magnetic susceptibility value χFD% is dominantly more than 2%, indicating the magnetic domain in sediment samples of Lake Tondano are a mixture of superparamagnetic (SP) and single-stable-domain (SSD). Keywords: Magnetic domains; magnetic minerals; lake sediments; magnetic susceptibility; magnetic grain size
Sentiment Analysis of Healthcare Services at RSUD Soe Using Machine Learning and Latent Dirichlet Allocation Saekoko, Agatha Marilin; Purnomo, Hindriyanto Dwi; Nataliani, Yessica
Jurnal Ilmiah Sains Volume 26 Issue 1, April 2026
Publisher : Sam Ratulangi University, Manado, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35799/jis.v26i1.67193

Abstract

Healthcare services constitute a crucial aspect in improving public well-being. Every individual has the right to receive healthcare services that are of high quality, safe, efficient, and affordable. This study aims to identify and analyze public perceptions and sentiments toward healthcare services at RSUD Soe, as well as to evaluate the performance of several machine learning methods in classifying such sentiments. The data were collected from 278 respondents through a Likert-scale questionnaire that represents perceptions and levels of satisfaction regarding various service aspects. Sentiment analysis was conducted using four machine learning algorithms, namely Naïve Bayes, C4.5, Random Forest, and Support Vector Machine. The results indicate that Naïve Bayes achieved the highest accuracy of 82.14 percent, followed by SVM at 80 percent, Random Forest at 79 percent, and C4.5 at 73.21 percent. This study also applied the Latent Dirichlet Allocation (LDA) method to identify the main themes within public feedback. LDA generated twelve topics reflecting key issues such as waiting time, availability of medical personnel, facility cleanliness, and the attitudes of healthcare staff. The majority of comments exhibited positive sentiment, particularly concerning staff friendliness and service quality. These findings were used to formulate improvement recommendations, including enhancing service quality, increasing the number of medical personnel, and optimizing facilities. This research demonstrates that a data-driven quantitative approach is effective in evaluating healthcare service quality and supporting more targeted decision-making. The results are expected to assist RSUD Soe in continuously and effectively improving service quality.
Toxicity of Copper (Cu) on Abnormalities and Mortality of Tilapia Fish (Oreochromis niloticus L.) Prolarvae Wa Ode Harlis; Desti Yulia Saputri; Nurhayu Malik; Andi Septiana; Resman Resman
Jurnal Ilmiah Sains Volume 26 Issue 2, October 2026
Publisher : Sam Ratulangi University, Manado, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35799/jis.v26i2.67205

Abstract

Contamination of the heavy metal Copper (Cu) in waters can inhibit fish growth by reducing the level of gonad maturity and closing the gill membranes. changes in activity, morphological abnormalities of the prolarvae and even death. This study aims to assess the toxicity of Copper (Cu) to tilapia fish prolarvae (Oreochromis niloticus L.). This research is a type of experimental research structured based on a Completely Randomized Design (CRD) pattern.  A total of 240 three-day-old tilapia prolarvae were divided into four treatment containers, namely Control, P1(2.0 mg/L), P2(2.5 mg/L), P3(3.0 mg/L), and each treatment consisted of three replications. Six hours after administration of copper, mortality parameters were observed, while prolarval abnormalities were observed after 48 hours.  Data were analyzed using one way ANOVA (Analysis of Varience) α=0.05. The results of the study showed that the average percentage of mortality for controls was (0%), P1(6.67%), P2(23.33%), P3(36.67%) while the forms of abnormalities found were kyphosis, lordosis, scoliosis and tail sticking. The research results show that copper (Cu) has a toxic effect because it increases the percentage of mortality and causes abnormalities in tilapia prolarvae (Oreochromis niloticus L.). Keywords: Copper (Cu); Oreochromis niloticus; prolarvae; toxicity
Antioxidant Activity of Clay Mask Stick with Premna serratifolia L. Extract Using Green Solvents Nurmala Sari; isnindar isnindar; Nera Umilia Purwanti
Jurnal Ilmiah Sains Volume 26 Issue 2, October 2026
Publisher : Sam Ratulangi University, Manado, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35799/jis.v26i2.67596

Abstract

Buas-buas leaves are a medicinal plant containing flavonoids and phenolic compounds with potential antioxidant activity to protect the skin from damage caused by free radicals. The use of green solvents has emerged as an alternative in developing safer and more sustainable cosmetic formulations. This study aimed to determine the IC₅₀ value of buas-buas leaf extracts obtained using green solvents and to formulate the most active extract into a clay mask stick preparation. Extraction was carried out using the MAE method with natural honey mixed with distilled water (1:20) and NADES based on citric acid and glucose (1:1). Antioxidant activity of both extracts and formulations was evaluated using the DPPH method to determine IC₅₀ values. The extract with the best activity was then formulated and further evaluated for physical and chemical stability using a cycling test method. The results showed that the NADES extract exhibited very strong antioxidant activity with an IC₅₀ value of 31.53 ppm, while the natural honey extract showed moderate activity with an IC₅₀ of 108.53 ppm. The clay mask stick formulations on day 0 had IC₅₀ values of 207.94 ppm (F1) and 171.57 ppm (F2), categorized as weak, and 110.88 ppm (F3), categorized as moderate. After six cycles of the cycling test, IC₅₀ values increased to 434.28 ppm (F1) and 312.55 ppm (F2), categorized as very weak, and 208.48 ppm (F3), categorized as weak, indicating decreased antioxidant activity after accelerated storage. However, all formulations remained physically stable and had pH values within a safe range for skin.

Page 36 of 36 | Total Record : 355

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