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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 10 Documents
 1 
Search results for , issue "Volume 24 Issue 1, April 2024" : 10 Documents clear
Comparison of the Toxicity of Watermelon Rind Extract (Citrullus lanatus) and Melon Rind Extract Using BSLT Method Fajrin Noviyanto Fajrin; Rinditya Lutfiah Syafa Kurnadi; Eva Kholifah; Afifah Nur Shobah; Leni Halimatusyadiah
Jurnal Ilmiah Sains Volume 24 Issue 1, April 2024
Publisher : Sam Ratulangi University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35799/jis.v24i1.49263

Abstract

Toxicity analysis is a preliminary test to observe a toxic pharmacological activity to find a safe dose to be developed into a new drug. The plants that potentially have poisonous effects are Watermelon rind (Citrullus lanatus) and Melon rind (Cucumis melo). The purpose of this study was determine the toxic potential of watermelon rind and melon rind using Brine Shrimp Lethality Test. Test BSLT and phytochemical screening. The results of research on watermelon rind and melon rind contain secondary metabolites, amely alkaloids, flavonoids, tannins, saponins. The result of the BSLT test watermelon rind extract and melon rind extract were different. For watermelon rind extract, the LC50 value was 305,19 µg/ml and for melon rind extract, the LC50 value was 816,73 µg/ml. The LC50 value pbtained from the research results of the two samplees is toxic to Artemia salina Leach, because the LC50 value is < 1000 µg/ml. Statistical test results using One Way Anova obtained a significant value of 0.027 where there were significant differences in the two samplesand various concertration, but both plants had the same toxic effect on Artemia salina Leach larvae. Keywords: Citrullus lanatus; Cucumis melo; LC50; toxicity
Comparison of Stock Prediction Using ARIMA Model with Multiple Interventions of Step and Pulse Functions Muh. Qodri; Utriweni Mukhaiyar; Vira Ananda; Siti Maisaroh
Jurnal Ilmiah Sains Volume 24 Issue 1, April 2024
Publisher : Sam Ratulangi University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35799/jis.v24i1.51269

Abstract

Stock price predictions based on technical analysis using historical data help investors determine the optimal time to buy or sell shares with the aim of achieving maximum profits. The aim of this research is to compare the results of Kimia Farma's share price predictions using the ARIMA model with intervention analysis of two variables at once, namely the pulse function and the step function. This is the novelty of this research. The data used in this research is daily data on Kimia Farma shares from the period 16 April 2018 to 14 April 2023. The best model produced is ARIMA (0,1,1) with intervention, shown by a MAPE value of 0.3356% and an RMSE of 0.3356%. 4.03. Kimia Farma's share price prediction for the next five days is 906.5548; 905.7875; 905.0206; 904.2542; 903.4882 rupiah. An increase in share prices occurred after the intervention in the period 15 April 2023 to 19 April 2023. Keywords: ARIMA; intervention model; step and pulse function; kimia farma
Susceptible-Infected-Recovered Model of Mathematics Anxiety Behavior on Students' Mathematics Study Results at Aquino Catholic High School Amurang Gabriella Setligt; Chriestie E.J.C Montolalu; Yohanes A.R. Langi; John S Kekenusa; Jantje D Prang; Mans L Mananohas; Charles E Mongi
Jurnal Ilmiah Sains Volume 24 Issue 1, April 2024
Publisher : Sam Ratulangi University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35799/jis.v24i1.51387

Abstract

This study aims to see the spread of mathematics anxiety behavior on the results of students' mathematics studies at Aquino Catholic High School Amurang by using the SIR (Susceptible-Infected-Recovered) mathematical model. A total of 88 samples were collected and categorized into three groups based on predetermined criteria. These groups consisted of 47 students categorized as susceptible, 27 as infected, and 14 as recovered. The parameters in this study measure the rate of change within these three groups over a 365-day period, equivalent to one year. Two equilibrium points are obtained that can interpret populations free from math anxiety behavior or endemic math anxiety behavior. The stability analysis of the two equilibrium points shows that the equilibrium point free from math anxiety behavior is locally asymptotically stable. Additionally, this study also reveals that math anxiety behavior will disappear in less than 40 days through the basic reproduction number (Ro) obtained, which is 0.99 or less than 1. Keywords: Amurang; mathematics anxiety; SIR model
Assimilate Partition of Potato (Solanum tuberosum L.) as Response to Combination of Paclobutrazol and Nitrogen Semuel Runtunuwu; Edy F. Lengkong; Stella Tulung; Deisire N.S. Darus; Riung Tumambo
Jurnal Ilmiah Sains Volume 24 Issue 1, April 2024
Publisher : Sam Ratulangi University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35799/jis.v24i1.52823

Abstract

Increasing the productivity of potato (Solanum tuberosum L.) can be done by increasing biological production (biomass) and the ability to convert (partition) assimilate/photosynthate into economic results (tubers). The aim of this research is to find a better combination of paclobutrazol (PBZ) application and nitrogen (N) fertilization for tuber partition assimilate of potato. The experiment was conducted in Randomized Block Design (RBD) with three replications. The treatment was consists of  nine combinations of PBZ treatments and N  fertilization as follows: 1) 3 kg PBZ/ha + 200 kg N/ha, 2) 3 kg PBZ/ha + 250 kg N/ha, 3) 3 kg PBZ/ha + 300 kg N/ha, 4) 3,5 kg PBZ/ ha + 200 kg N/ha, 5) 3,5 kg PBZ/ha + 250 kg N/ha, 6) 3,5 kg PBZ/ha + 300 kg N/ha, 7) 4 kg PBZ/ha + 200 kg N/ha, 8) 4 kg PBZ/ha + 250 kg N/ha, 9) 4 kg PBZ/ha + 300 kg N/ha. The research results showed that at the beginning of growth up to 42 DAP (day after plan), the assimilate (dry material) was directed towards stem and leaf (shoot) growth. Next, at 56 DAP to 84 DAP the assimilate is allocated for tuber growth. The combination of 4 kg PBZ/ha + 200 kg N/ha produces the largest tuber weight Keywords: Potato (Solanum tuberosum L);  nitrogen; paclobutrazol; partition assimilate
Antioxidant Activity of Virgin Coconut Oil Emulsion Drink with The Addition of Cinnamon (Cinnamomum burmanii) G.S. Suhartati Djarkasi; Maria Fransisca Sumual; Lana E. Lalujan; Ambar Kurnia; Jeanet Rotulung
Jurnal Ilmiah Sains Volume 24 Issue 1, April 2024
Publisher : Sam Ratulangi University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35799/jis.v24i1.52832

Abstract

ABSTRACT The aims of this study were to analyse the antioxidant activity and to determine the maximum concentration of cinnamon extract that can improve sensory attributes of VCO emulsion drink. The research method used is a completely randomized design (CRD) with five concentrations of cinnamon extract, i.e., 0% (P1), 2% (P1), 4% (P2), 6% (P3), and 8% (P3). Each treatment was triplicated. The results showed that all treatments exhibited stable emulsion with 0% creaming index. VCO emulsion drink with cinnamon extract contained total phenol ranged from 19.88 mg GEA/100 g to 28.58 mg GEA/100 g, with increasing antioxidant activity, expressed as percentage of inhibition, where P1: 80.35%; P1: 85.59%; P2: 86.38%, P3: 87.43%, and P4: 88.54%, respectively. It was concluded that cinnamon extract could increase the antioxidant activity of VCO emulsion drinks. Increasing percentage of cinnamon extract can increase the total phenol content, hence increase the inhibitory power on the formation of peroxide compounds. The addition of 6% cinnamon is the maximum limit that can improve the panellists’ liking for the overall sensory attributes of the VCO emulsion drink. Keywords: Antioxidant activity; cinnamon; VCO emulsion
Implementation of the Vector Space Model Algorithm for Document Searching in Material Test Monitoring Applications (Case Study: BPJN Jayapura Lab) Serwin Gonzaga Rumagit; Debby Paseru; Thomas Ch. Suwanto
Jurnal Ilmiah Sains Volume 24 Issue 1, April 2024
Publisher : Sam Ratulangi University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35799/jis.v24i1.52967

Abstract

The material test monitoring application built in 2021 aims to facilitate BPJN Jayapura's work in entering administrative data files to facilitate the material test monitoring process carried out from the process stage to the material test results stage. However, in using it for 2 years, the application has had problems. The application is unable to search for documents stored in the database so the search is carried out one by one. This makes it difficult for users because there are more than 30 documents. Therefore, this research will focus on creating a document search engine (search engine) using the Vector Space Model method. This algorithm will measure the level of similarity of documents to the keywords or queries entered by the user. This research implements the Vector Space Model method to make it easier to search for documents in the application. In carrying out this research, the Software Development Life Cycle methodology will be used as a method for creating the search engine using the Unified Modeling Language version 2.5.1 modeling tool and the PHP programming language. Based on the tests that have been carried out, the Vector Space Model method has been successfully implemented and is able to function as a search engine with a precision level of 0.83 and a recall of 1 for searching 40 documents as samples. Keywords: Document search; Jayapura; vector space model
The Effect of Cloride Acid Concentration to The Phenolic Compound and The Antioxidant Activity in Methanol Extract of Sargassum oligocystum Etik Wahyuningsih; Rachma Nurhayati; Astrid Kusuma Putri
Jurnal Ilmiah Sains Volume 24 Issue 1, April 2024
Publisher : Sam Ratulangi University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35799/jis.v24i1.53431

Abstract

Sargassum oligocystum is a species of brown algae that has many biological activities. The aim of this research is to analyze the polyphenol compound and antioxidant activity with methanol solvent at varying acid concentrations. Addition of hydrochloric acid in methanol solvent at various concentrations of 0.1 N; 0.2 N, 0.3 N in Sargassum oligocystum showed an increase in polyphenol compound, 2.82 mg GEA/g; 3.27 mg GEA/g and 3.88 mg GAE/g, respectively. The increase in polyphenol compound is proportional to the increase in antioxidant activity, 0.92 mg; 0.55 mg and 0.29 mg, respectively. The results showed that methanol extraction with variations of hydrochloric acid in Sargassum oligocystum contained polyphenols and antioxidant activity which increased with increasing acid concentration. Keywords: Antioxidant activity; cloride acid; methanolic extract; phenolic compound; Sargassum oligocystum
In Vitro Test of Leilem Leaf Ethanol Activity on β-Glucosidase Enzyme Inhibition Krispela Trifosa Oktavia Siregar; Fona Dwiana Hermina Budiarso; Billy Johnson Kepel; Fatimawali Fatimawali; Aaltje Ellen Manampiring; Widdhi Bodhi
Jurnal Ilmiah Sains Volume 24 Issue 1, April 2024
Publisher : Sam Ratulangi University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35799/jis.v24i1.53599

Abstract

Diabetes is a chronic metabolic disease with signs of elevated blood glucose levels. One of the targets of antidiabetic drugs is to inhibit the enzyme α-/β-glucosidase which works in the process of glucose absorption. Leilem plant (Clerodendrum minahassae Teisjm. & Binn.) is well known and used as a dish and medicine for several diseases in Minahasa and has potential as an antidiabetic agent. This study aimed to determine the activity of ethanolic extract of leilem leaves in inhibiting β-glucosidase enzyme. The extract was prepared with 96% ethanol. Antidiabetic properties were measured by β-glucosidase enzyme inhibitory activity. The inhibitory concentration (IC50) values of the extract compared tp acarbose were 28,229 and 13,716. Ethanol extract of leilem leaves inhibits β-glucosidase enzyme. Keywords : β-glucosidase; ethanol extract; in vitro; leilem leaf
Analisis Groundwater Study Using Vertical Electrical Sounding (VES) Data Based on Resistivity and Porosity of Rocks in Kampung Melayu, Bengkulu City Tella Dwi Syaputri; Suhendra Suhendra; Halauddin Halauddin; Liza Lidiawati; Risma Nurhidayah
Jurnal Ilmiah Sains Volume 24 Issue 1, April 2024
Publisher : Sam Ratulangi University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35799/jis.v24i1.54133

Abstract

This research aims to identify groundwater based on the value of resistivity and porosity of rocks, which are important parameters in the management of groundwater resources and Development Planning in the region. This groundwater research using Vertical Electrical Sounding (VES) data based on the value of resistivity and porosity of rocks was carried out by measuring resistivity using the (VES) method at 20 sounding points located in Kampung Melayu District, Bengkulu City. The VES method is one of the approaches in the geoelectric method to determine the lithological characteristics of subsurface rocks. Resistivity Data obtained were then inverted and analyzed and interpreted to obtain lithology of subsurface rocks and groundwater level distribution in Kampung Melayu, Bengkulu City. The results showed the presence of groundwater based on low resistivity anomaly values with a range of values from 5 to 30 meters in the West and 10 to 50 meters in the East, with resistivity values ranging between 5 Ω.m up to 45 Ω.m. This research is expected to make a significant contribution to the management of groundwater resources in the District of Kampung Melayu, Bengkulu City and can be the basis for development planning in the area. In addition, it is hoped that the results of this research can be a reference for further research in the field of hydrogeology and groundwater modeling. Keywords: Aquifer; geoelectricity; groundwater; porosity; resistivity
Structural Equation Modeling for the Influence of Effectiveness, Lifestyle, and Income Level on the Use of E-Wallet Services by Urban Workers’ Putri Ayu Agustina; Harmi Sugiarti
Jurnal Ilmiah Sains Volume 24 Issue 1, April 2024
Publisher : Sam Ratulangi University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35799/jis.v24i1.54458

Abstract

The convenience and advantages that e-wallets offer in transactions have the potential to change people's perception of conventional transactions. This study aims to investigate whether the use of e-wallet services by workers is influenced by factors such as effectiveness, lifestyle, and income level. The data was collected via questionnaires which were randomly distributed amongst 100 workers in Bekasi City and its surroundings. The ordinal data obtained was converted into interval data using the successive interval (MSI) method, which was later analyzed using the Structural Equation Modeling, Partial Least Square (SEM PLS) technique. The results of the study indicate that variables such as effectiveness and lifestyle have a positive and significant impact on workers' interest in using e-wallets, while the income level variable has an insignificant influence on their interest in using e-wallets.

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