cover
Article Per Year (5 Year)
All
Home Page
OAI Link
Editorial Team
Contact
Reviewer
Google Scholar
Contact Name
Djoni Hatidja
Contact Email
dhatidja@unsrat.ac.id
Phone
+628124442829
Journal Mail Official
dhatidja@unsrat.ac.id
Editorial Address
Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Sam Ratulangi Jl. Kampus Kleak Manado 95115
Location
Kota manado,
Sulawesi utara
INDONESIA
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 348 Documents
 31   32   33   34   35 
Pengaruh Sifat Termofisis Kaca Jendela Terhadap Suhu Radiasi Dalam Ruangan Akibat Paparan Sinar Matahari Sangkertadi Sangkertadi; Alicia A.E. Sinsuw; Octavianus H.A. Rogi; Surijadi Supardjo; Ricky M.S. Lakat; Stepahanie J Najoan; Asni A. Nuchri; Rexvan L Podung
Jurnal Ilmiah Sains Volume 25 Issue 2, October 2025
Publisher : Sam Ratulangi University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35799/jis.v25i2.62421

Abstract

This paper describes the influence of thermophysical properties of building window glass on changes in radiation heat in a room due to sunlight on the window glass surface. From the various properties of glass, it is necessary to know which one has the greatest influence on the average radiation temperature in a room. This study uses a simulation calculation method by applying a steady-state heat transfer model using a spreadsheet and a computer program. In the calculation process, various variations of glass thermophysical properties are applied, including heat absorption coefficient, heat transmittance, heat reflectance, thickness and emissivity. In addition, the amount of solar radiation from 08.00 am to 04,00 pm was also varied with the case of tropical climates. The direction of the windows is varied facing North and West. The location of the building is at 1.50 North Latitude. The case is a typical office room measuring (6x6x2.5) m3, where the size of the window glass is considered full on the face facing the sky. The output is the temperature of the outer and inner glass surfaces, the temperature of the walls and floors in the room exposed to direct sunlight, and the average radiation temperature in the room. Visualization of the radiation heat emission pattern is also displayed using a heat transfer software. The simulation results show that the heat transmittance coefficient is the thermophysical property that has the most influence on changes in average heat radiation in the room. Meanwhile, the amount of heat absorption by glass has a significant effect on the surface temperature of the outer and inner glass areas. Keywords: Glass; Radiation; Tropical; Window
Pharmacological Potential of the Stem of Butterfly Root Plant (Phanera semibifida Roxb. var. semibifida): A Phytochemical, Toxicity, and Anti-Inflammatory Activity Study Ayu Mellyanti; Rita Hairani; Erwin Erwin; Winni Astuti; Medi Hendra; Eva Marliana
Jurnal Ilmiah Sains Volume 25 Issue 2, October 2025
Publisher : Sam Ratulangi University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35799/jis.v25i2.62442

Abstract

Phanera semibifida Roxb. var. semibifida, commonly known as the butterfly root plant, is one of the plants frequently used by various indigenous tribes in Kalimantan as a traditional medicinal plant. This study was conducted to identify the secondary metabolite compounds, toxicity level, and anti-inflammatory activity of the plant. Extraction of the stem of the butterfly root plant was carried out using the maceration method with methanol as the solvent, followed by partitioning with n-hexane and ethyl acetate. Phytochemical screening of the stem was performed using Thin Layer Chromatography (TLC). Toxicity testing was conducted using the Brine Shrimp Lethality Test (BSLT), and anti-inflammatory activity was evaluated based on protein denaturation inhibition in vitro using a ultraviolet-visible (UV-Vis) spectrophotometer. The crude extract of the stem was found to contain alkaloids, triterpenoids, steroids, flavonoids, and phenolics; the n-hexane fraction contained triterpenoids and steroids; the ethyl acetate fraction contained alkaloids, triterpenoids, steroids, flavonoids, and phenolics, while the aqueous fraction contained alkaloids, flavonoids, and phenolics. The toxicity levels (LC₅₀) of the crude extract, n-hexane fraction, ethyl acetate fraction, and aqueous fraction were 57.45; 158.04; 42.34; and 72.88 µg/mL, respectively, indicating toxic activity against Artemia salina L. larvae. The anti-inflammatory activity levels (IC₅₀) of the crude extract, n-hexane fraction, ethyl acetate fraction, and aqueous fraction were 124.95 µg/mL (moderate category); 161.27 µg/mL (moderate category); 99.15 µg/mL (strong category); and 143.44 µg/mL (moderate category), respectively. These results indicate that the stem of the butterfly root plant (Phanera semibifida Roxb. var. semibifida) contains bioactive compounds and has potential as a natural anti-inflammatory agent.
Optimization of Temperature and Time of Microwave Assisted Extraction of Dewandaru Leaves (Eugenia uniflora L.) on Antioxidant Activity and Its Application in Body Scrub Khoirul Anwar; Gharsina Ghaisani Yumni; Ayu Shabrina; Aulia Septiani Putri; Melani Putri Britama
Jurnal Ilmiah Sains Volume 25 Issue 2, October 2025
Publisher : Sam Ratulangi University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35799/jis.v25i2.63488

Abstract

Dewandaru leaves (Eugenia uniflora L.) contain phenolic and flavonoid compounds that function as natural antioxidants. This study aimed to determine the optimal extraction temperature and duration using the Microwave-Assisted Extraction (MAE) method to maximize the antioxidant activity of the ethanolic extract of Dewandaru leaves, and to incorporate the optimized extract into a body scrub formulation. Extractions were carried out at temperatures ranging from 40–80 °C and durations of 10–30 minutes, optimized using Design Expert 13.0. Phytochemical screening and FTIR spectra confirmed the presence of phenolic and flavonoid compounds, indicated by absorption peaks at 3248.4 cm⁻¹ (bonded O–H), 1654.9 cm⁻¹ (conjugated aromatic C=C), and 1112.6–1205.8 cm⁻¹ (phenolic C–O). The IC₅₀ value was used as an indicator of antioxidant activity. The optimal combination was obtained at 63 °C and 30 minutes, yielding 24.794% extract with an IC₅₀ value of 70.325 ppm. The optimized extract was formulated into four variations of body scrub and evaluated for physical parameters such as pH, viscosity, spreadability, and adhesiveness. All formulations exhibited stable characteristics suitable for topical application. These findings indicate that the MAE method is effective for extracting bioactive compounds from Dewandaru leaves and has potential for development as an active ingredient in natural cosmetic preparations. Keywords: Antioxidants;  body scrub; dewandaru; flavonoids
Design and Application of a Drip Irrigation System Using Solar Power David P. Rumambi; Ruland A. Rantung; Hildy Wullur
Jurnal Ilmiah Sains Volume 25 Issue 2, October 2025
Publisher : Sam Ratulangi University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35799/jis.v25i2.63768

Abstract

This research aims to design and apply a solar-powered drip irrigation system that is efficient in water use, especially on dry land. The system is designed using 100 WP solar panels to drive drip irrigation pumps, thus saving energy and reducing dependence on conventional energy sources. The research was conducted at the Green House of the Faculty of Agriculture, Sam Ratulangi University, with the method of assembling and testing the performance of the system. The results show that this drip irrigation system has a water flow uniformity coefficient of 97% with an average discharge per dripper reaching 24.53 ml/minute. This system allows for consistent water distribution and meets the water needs of pakcoy plants in dry land. The application of this solar-based drip irrigation system not only improves water use efficiency but also offers environmentally friendly and energy-saving solutions. The results of this study support the use of renewable energy in the agricultural sector and are expected to be adapted to various locations with similar geographical conditions to support sustainability and food security. Keywords: Drip irrigation; dryland; renewable energy; solar power; water efficiency
Mold on Food Product: Comparative Analysis of YOLO Variants for Detecting Rhizopus stolonifer on Bread Vanny Hani Siwi; Jonathan Wuntu; Norrytha Lineke Wuntu; Audy Denny Wuntu
Jurnal Ilmiah Sains Volume 25 Issue 2, October 2025
Publisher : Sam Ratulangi University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35799/jis.v25i2.64398

Abstract

Bread is a staple food that is highly susceptible to fungal contamination, particularly by Rhizopus stolonifer, which poses significant health and food safety risks. Early and accurate detection of mold growth is essential to prevent spoilage and ensure consumer safety. This study presents a comparative analysis of recent YOLO (You Only Look Once) variants, YOLOv8n, YOLOv10n, YOLO11n, and YOLOv12n for detecting Rhizopus stolonifer mold on bread surfaces. This study utilized a mold detection dataset sourced from the Roboflow platform, which contains annotated bread images captured under diverse lighting, texture, and contamination conditions to support robust model training. Each YOLO variant was trained and evaluated under consistent hyperparameters to ensure fairness in comparison. Experimental results indicate that YOLOv8n achieved an mAP50 of 0.472 and mAP50:95 of 0.203; YOLOv10n achieved 0.474 and 0.191, respectively; YOLO11n achieved 0.504 and 0.204; and YOLOv12n achieved 0.503 and 0.224. Among these, YOLO11n demonstrated the highest mAP50 performance, while YOLOv12n attained the best mAP50:95 score, indicating superior detection consistency across varying IoU thresholds. These findings suggest that recent YOLO architectures offer promising potential for real-time and automated detection of Rhizopus stolonifer mold in bread, supporting advancements in intelligent food safety monitoring systems.
Kelimpahan Makrozoobentos di kawasan Pantai Summer Beach, Muara Badak, Kabupaten Kutai Kartanegara Midlan Witrawan; Suryana, Irma; Ritonga, Irwan Ramadhan
Jurnal Ilmiah Sains Volume 26 Issue 1, April 2026
Publisher : Sam Ratulangi University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35799/jis.v26i1.56711

Abstract

Macrozoobenthos serves as a sensitive bioindicator for changes in aquatic environmental conditions, particularly in coastal areas vulnerable to anthropogenic pressures. This study aims to identify species composition and analyze the abundance of macrozoobenthos in the Summer Beach area, Muara Badak, Kutai Kartanegara Regency. Sampling was conducted from January to April 2024 at three stations using the line transect and quadrat plot method. The results identified 14 macrozoobenthos species belonging to 10 genera from the class Gastropoda (Babylonia formosae, Eunaticina albosutura, Murex tribulus, Telescopium telescopium, Indothais blanfordi, Cerithidea cingulata, Turritella terebra, Brunneifusus ternatanus, Nassarius olivaceus, Olivella biplicata) and 4 genera from the class Bivalvia (Tegillarca granosa, Geloina expansa, Heteranomia squamula, Chamelea gallina). Ecological index analysis showed moderate diversity (H’), high evenness (E), and low dominance (C) values at all stations. Correlation analysis revealed a strong relationship between phosphate concentration and macrozoobenthos abundance, while the relationship with nitrate was very weak. These findings indicate that phosphate is a key parameter influencing the macrozoobenthos community structure at the study site.
Sistem Monitoring Arus dan Tegangan Pada Panel Surya 50Wp Berbasis IoT Suoth, Verna Albert; Pandara, Dolfie Paulus; Kolibu, Hesky Stevy
Jurnal Ilmiah Sains Volume 26 Issue 1, April 2026
Publisher : Sam Ratulangi University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35799/jis.v26i1.64415

Abstract

The utilization of small-scale solar panels, particularly those with a capacity of 50 Wp, has become increasingly widespread in household systems and remote areas. However, the lack of adequate monitoring systems makes it difficult for users to identify actual panel performance, causing efficiency degradation to often go undetected at an early stage. This study aims to develop a current and voltage monitoring system for a 50 Wp solar panel based on the Internet of Things (IoT) that is capable of providing real-time performance data to support performance evaluation and more efficient energy management. The system was developed using current and voltage sensors, an ESP32 microcontroller, and a cloud-based IoT application for data visualization. The test results indicate that the system is able to monitor daily variations in current and voltage with good accuracy and stable data transmission. The measured output power of the solar panel ranges from 1 to 1.4 W, or approximately 2–3% of the nominal capacity, which is influenced by solar radiation intensity, panel temperature, and system losses. The proposed IoT-based monitoring system has proven effective in recording the actual performance of the solar panel and providing real-time information that is useful for performance evaluation and optimization of small-scale solar energy utilization.
Etnopharmacy Study of Medical Plants in Sulawesi Kauntu, Rafael; Zuhrotun, Ade; Iskandar, Yoppi
Jurnal Ilmiah Sains Volume 26 Issue 1, April 2026
Publisher : Sam Ratulangi University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35799/jis.v26i1.65912

Abstract

Sulawesi Island, Indonesia, is recognized for its high biodiversity and rich cultural diversity, both of which contribute to the extensive use of medicinal plants in traditional healthcare systems. The increasing global interest in plant-based medicine—driven by the rising prevalence of chronic diseases, antimicrobial resistance, and concerns regarding the adverse effects of synthetic drugs—highlights the importance of documenting regional ethnopharmaceutical knowledge. This study aims to synthesize available literature on medicinal plants traditionally used by communities in Sulawesi. A systematic literature review was conducted using electronic databases, including Google Scholar, PubMed, and Elsevier, covering publications from 2014 to 2025. Articles were screened based on predefined inclusion criteria, resulting in 20 eligible studies. The findings identified 17 plant species used across six provinces, with leaves as the most frequently utilized plant part (64.70%) and decoction as the predominant preparation method (47.05%). Five representative species—Ficus septica, Lansium domesticum, Blumea balsamifera, Cymbopogon citratus, and Piper betle—demonstrate pharmacological potential supported by phytochemical and experimental evidence. Although traditional use aligns with emerging scientific findings, clinical validation and standardization remain limited. These results emphasize the urgency of systematic documentation and rigorous scientific evaluation of medicinal plants in Sulawesi to support biodiversity conservation and future drug discovery initiatives.

Page 35 of 35 | Total Record : 348

 31   32   33   34   35 

Filter by Year

2007 2026


Reset
Filter By Issues
All Issue Volume 26 Issue 1, April 2026 Volume 25 Issue 2, October 2025 Volume 25 Issue 1, April 2025 Volume 24 Issue 2, October 2024 Volume 24 Issue 1, April 2024 Volume 23 Nomor 2, Oktober 2023 Volume 23 Nomor 1, April 2023 Volume 22 Nomor 2, Oktober 2022 Volume 22 Nomor 1, April 2022 Volume 21 Nomor 2, Oktober 2021 Volume 21 Nomor 1, April 2021 Volume 20 Nomor 2, Oktober 2020 Volume 20 Nomor 1, April 2020 Volume 19 Nomor 2, Oktober 2019 Volume 19 Nomor 1, April 2019 Volume 18 Nomor 2, Oktober 2018 Volume 18 Nomor 1, April 2018 Volume 17 Nomor 2, Oktober 2017 Volume 17 Nomor 1, April 2017 Volume 16 Nomor 2, Oktober 2016 Volume 16 Nomor 1, April 2016 Volume 15 Nomor 2, Oktober 2015 Volume 15 Nomor 1, April 2015 Volume 14 Nomor 2, Oktober 2014 Volume 14 Nomor 1, April 2014 Volume 13 Nomor 2, Oktober 2013 Volume 13 Nomor 1, April 2013 Volume 12 Nomor 2, Oktober 2012 Volume 12 Nomor 1, April 2012 Volume 11 Nomor 2, Oktober 2011 Volume 11 Nomor 1, April 2011 Volume 9 Nomor 1, April 2009 Volune 8 Nomor 1, April 2008 Volume 7 Nomor 1, April 2007 More Issue