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Media Eksakta
Published by Universitas Tadulako
ISSN : 02163144     EISSN : 2776799X     DOI : -
Core Subject : Science, Education,
Biochemistry, Genetics & Molecular Biology Chemistry Education Mathematics Other
The aim of this journal is to provide a venue for academicians, researchers, and practitioners for publishing original research articles or review articles. The scope of the articles published in this journal deal with a broad range of topics about mathematics and science in the field of mathematics, physics, biology, and chemistry, and then mathematics and science education in the fields of curriculum, instruction, learning, preparation of teachers, and environmental education.
Arjuna Subject : Ilmu Sosial - Pendidikan
Articles 87 Documents
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Analisis Logam Merkuri (Hg) pada Air Sungai Janja di Derah Pertambangan Mita Rosita; Tri Santoso; Sitti Aminah; Sri Hastuti Virgianti Pulukadang
Media Eksakta Vol 18 No 2 (2022)
Publisher : Universitas Tadulako

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22487/me.v18i2.2374

Abstract

Mercury metal (Hg) is included in the heavy metal group which is toxic because it has neurotoxin properties for living things. As a heavy metal, mercury (Hg) will be difficult to decompose if it enters the waters, mercury (Hg) will also form deposits in sediments. Mercury is found in nature and is found in soil, water and air. Mercury is rarely found in its free form in nature but is in the form of cinnabar (HgS) seeds. Mercury metal is usually easy to find in mining areas, such as in gold mining areas. Gold mining is one of the activities that can increase people's income, but gold mining can be detrimental if in its implementation it is not followed by a good gold processing waste treatment process. The method used in this research is cold vapor atomic absorption spectrophotometry. The results obtained in this study are the metal content of miner 1 as many as 3 samples. Sample 1 has a concentration of 1.2594 ppm; sample 2 has a concentration of 0.4924 ppm; and sample 3 has a concentration of 0.2091 ppm. Miner 2 as many as 3 samples of which sample 1 has a concentration of 1.0260 ppm; sample 2 has a concentration of 0.3401 ppm; and sample 3 has a concentration of 0.3152 ppm. And miner 3 has 3 samples where sample 1 has a concentration of 0.7215 ppm; sample 2 has a concentration of 0.2464 ppm; and sample 3 has a concentration of 0.3461 ppm. The results obtained from the calculation of metal concentrations of mercury (Hg) show that the water of the Janja river has been contaminated with heavy metals, namely mercury (Hg). This is due to mining in the Janja river.
The Pengaruh Strategi Pembelajaran Blended Learning terhadap Kemampuan Berpikir Kritis dan Motivasi Belajar Siswa pada Materi Reaksi Redoks Rina Andriana; Kasmudin Mustapa; Afadil Afadil; Magfirah Magfirah
Media Eksakta Vol 18 No 2 (2022)
Publisher : Universitas Tadulako

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22487/me.v18i2.2382

Abstract

Based on the results of the study, the percentage of critical thinking skills in the experimental class for each indicator namely giving simple explanations, building basic skills, concluding, making further explanations, strategies and tactics, respectively, were 82%, 63%, 72%, 68% 67%. The control class for each indicator namely giving simple explanations, building basic skills, concluding, making further explanations, strategies and tactics are 76%, 54%, 59%, 56%, 52%, respectively. The percentage results of the experimental class learning motivation questionnaire for each indicator namely attention, relevance, belief, and satisfaction respectively 84%, 83%, 87.4%, 83%, the control class for each indicator namely attention, relevance, belief, and satisfaction are 76.3%, 81%, 77%, 74.4% with the result that the blended learning strategy affects critical thinking skills and learning motivation of class X students on redox reaction material at SMAN 1 Balaesang.
Analisis Peran Guru dalam Pemanfaatan Laboratorium Kimia di Sekolah Moh Ilpan Samiun
Media Eksakta Vol 18 No 2 (2022)
Publisher : Universitas Tadulako

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22487/me.v18i2.2424

Abstract

This study aims to (1) describe the teacher's role in the use of the chemistry laboratory (2) describe the teacher's obstacles in the use of the chemistry laboratory (3) describe the solution to overcome the obstacles in the use of the chemistry laboratory. This research uses descriptive qualitative research with an inductive approach. This research uses observation, interview, and documentation techniques. The results of the study show: (1) the role of the teacher as a class manager develops students' abilities in using learning tools, provides conditions that allow students to work and learn, the teacher as a facilitator provides facilities that allow students to learn optimally to get poor results. good. (2) the main obstacles are inadequate facilities and infrastructure, namely insufficient tools and materials, lack of teacher time allocation and lack of teacher readiness. (3) the solution is to provide alternative tools and materials, hold a meeting again with the principal to discuss the completeness of tools and materials, discuss the allocation of teacher time, and provide input so that the person in charge of the laboratory and chemistry teachers can be included in the chemical laboratory management training.
Analisis Kadar Senyawa Flavonoid pada Daun Bawang Hutan (Eleutherine palmifolia (L.) Merr.) Mitha Widya Ningrum; Siti Nuryanti
Media Eksakta Vol 18 No 2 (2022)
Publisher : Universitas Tadulako

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22487/me.v18i2.2473

Abstract

Forest onion (Eleutherine palmifolia (L.) Merr.) is one of the plants commonly used by the community as traditional medicine. This plant can cure diseases such as diabetes mellitus, hypertension, prevent stroke and can lower cholesterol. Forest onions are known to contain compounds such as flavonoids, phenolics, tannins, and saponins. This study aims to determine the levels of flavonoid compounds in forest leek extract. Samples were extracted using maceration method with 70% ethanol as solvent. Determination of flavonoid levels using a UV-VIS spectrophotometer at a wavelength of 432.5 nm and using quercetin as a comparison (QE). The results of this study showed the levels of flavonoid compounds in forest leeks were 27.203 mg/100g±0,348.
Uji Aktivitas Antioksidan Ekstrak Etanol Daun Balaroa (Kleinhovia hospita L.) Menggunakan DPPH Uci Edy; Supriadi Supriadi; Anang Wahid Muhammad Diah; Minarni Rama Jura
Media Eksakta Vol 19 No 1 (2023)
Publisher : Universitas Tadulako

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22487/me.v19i1.1070

Abstract

To test the antioxidant activity of the ethanol extract of balaroa leaves (Kleinhovia hospita L) using the compound DPPH (2,2-diphenyl-1-pikrilhidrazil) as a provider of free radicals. This study aims to describe the strong, moderate or weak antioxidant activity of balaroa leaf extract. Balaroa leaf powder was extracted by maceration using absolute ethanol as a solvent. Testing the antioxidant activity of balaroa leaf extract was carried out with various concentrations of 20 ppm, 40 ppm, 60 ppm, 80 ppm, and 100 ppm. The antioxidant activity of balaroa leaf extract was analyzed using a UV-Vis spectrophotometer at a wavelength of 517 nm. The results obtained showed that the IC50 value of balaroa leaf extract was 145.211 ppm while the vitamin C reference solution was 4.909 ppm. Based on the IC50 value data, it can be determined that the ethanol extract of balaroa leaves is a moderate antioxidant.
Identifikasi Pemahaman Konsep dan Self Efficacy Siswa pada Materi Struktur Atom dan Sistem Periodik Unsur Nurwahyuni Nurwahyuni; Sri Hastuti Virgianti; Afadil Afadil
Media Eksakta Vol 19 No 1 (2023)
Publisher : Universitas Tadulako

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22487/me.v19i1.1083

Abstract

Understanding the concept is a process in which students are able to understand the information obtained, both the definition, nature and description of a concept so that they are able to construct the concept. Self Efficacy is the ability of individuals to organize the actions needed for certain achievements. This study aims to (1) describe students' conceptual understanding of atomic structure material and the periodic system of elements. (2) describe student self-efficacy in atomic structure material and the periodic system of elements. The type of research used in this study was descriptive research with a quantitative approach. The instruments used in this study were three-tier questions and self-efficacy questionnaires. This research was conducted at SMAN 4 Palu in class X MIPA students. The results showed that students' understanding of concepts in atomic structure material and the periodic system of elements averaged the percentage of students who understood the concept of 34.35% classified as understanding the concept of the low category, students who did not understand the concept of 24.1% were in the low category while students who experienced a misconception of 41.35% in the sufficient category. The results of student self-efficacy research show that student self-efficacy is good because most are in the high category of 45 students (75%), the sufficient category is 15 students (25%).
Analisis kadar mineral mikro tembaga dan besi pada biji durian Ayu Lestari; Irwan Said
Media Eksakta Vol 19 No 1 (2023)
Publisher : Universitas Tadulako

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22487/me.v19i1.1112

Abstract

This study aims to determine the levels of copper and iron contained in durian seeds, determine the levels of copper and iron using Atomic Absorption Spectrophotometer (AAS). The results showed that the analysis of the water content of durian seeds obtained 37.382%, ash content 17.782% and mass 44.835%. Analysis of the iron content measured at the copper wavelength of 248,3 nm, at the wavelength of 249,2, the results obtained respectively 49.244 ± 116.076 mg/100g for copper and 66.495± 15.753 mg/100g for iron. The results of this study are expected to be one of the alternative food ingredients that can be processed into food to meet the copper and iron substances in the body.
Pengaruh Variasi Waktu Fermentasi Terhadap Aktivitas Antioksidan Pada Minuman Kombucha Pulpa Kakao (Theobroma cacao L) Endang Sri Rahayu; Paulus Hengky Abram
Media Eksakta Vol 19 No 1 (2023)
Publisher : Universitas Tadulako

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22487/me.v19i1.2405

Abstract

The purpose of this study is to determine the antioxidant activity based on the effect of fermentation variation time of cocoa pulp kombucha drink (Theobroma cacao L.). The sample used in this study is cocoa pulp obtained from yellow cocoa pods the plantation in Sibualong Village, Balaesang District, Donggala Regency. DPPH method is used to see the reduction of free radical occurs caused by antioxidant compounds in fermented cocoa pulp kombucha drink. Antioxidant activity absorbances measured by UV/Vis will be calculated by regretion equation. The value obtained from the regretion equation shows the IC50 value, if the IC50 value is below 50 ppm it indicates a very strong antioxidant activity and if the IC50 value is above 200 ppm it indicates a very weak antioxidant activity. The study show, there to effect of fermentation variation time of the antioxidant activity which is identified by the increasing of IC50. The study shows, there to effect of fermentation variation time of the antioxidant activity which is identified by the increasing of IC50, with IC¬50 values 3rd, 10th and 14th days respectively are 29,387 ppm, 322,404 ppm, and 215,298 ppm. So the best fermentation time is 3 days which shows the IC50 value less than 50 ppm so that the antioxidant activity is included in the very good category.
Analisis Jenis dan Kandungan Makanan Oreochromis mossambicus dan Oreochromis nilotica asal Danau Lindu Syech Zainal; Manap Trianto; Novalina Serdiati; Raya Agni
Media Eksakta Vol 19 No 1 (2023)
Publisher : Universitas Tadulako

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22487/me.v19i1.3461

Abstract

The purpose of this study was to describe the type and content of food for Mujair and tilapia fish from Lake Lindu by means of a section and taking gastric contents and observing and analyzing them. The stages of the research were fish sampling, surgery (section), research in the laboratory and testing the nutritional content of food (carbohydrates, protein and fat). The research samples were Mujair fish (Oreochromis mossambicus) and Tilapia (Oreochromis nilotica) from Lake Lindu. Based on research obtained by the types of fish food O. mossambicus obtained two groups of Phytoplankton namely, Oedogonium sp, Anabaena sp, Nostoc sp, Oscillatoria princeps, Diatomae sp, Navicula gysingen, Rivularia sp, Coelastrum sphaericum, and Zooplankton namely Chironomus sp, Dugesia tigrina. There were eight types of food for O. nilotica, consisting of six types of phytoplankton, namely Oedogonium sp, Anabaena sp, Nostoc sp, Oscillatoria princeps, Rivularia sp, Coelastrum sphaericum and 2 types of zooplankton feed, namely Chironomus sp and Dugesia tigrina. The nutritional content of fish food/feed is protein (15.18%), fat (19.20%), and carbohydrates (1.9%).
Aktivitas Antioksidan Pada Buah, Tepung, dan Biskuit Berbasis Labu Siam (Sechium edule) Fajriani Fajriani; Jamaludin Sakung
Media Eksakta Vol 19 No 1 (2023)
Publisher : Universitas Tadulako

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22487/me.v19i1.3464

Abstract

Chayote or Sechium edule is one of Indonesia's plants and is a potential food commodity to be used as the main ingredient for product development, chayote is a plant that lives in tropical and sub-tropical areas. This study aims to determine the antioxidant content of fruit, flour and chayote biscuits using UV-Vis spectrophotometry. Analysis of the antioxidant content in this research is using the DPPH method (1,1-diphenyl-2-picrylhydrazil) as a source of free radicals. Fruit extract, flour and chayote biscuits were analyzed for their antioxidant content with various concentrations of 20 ppm, 40 ppm, 60 ppm, 80 ppm, 100 ppm. The results obtained that raw chayote fruit extract has a very weak antioxidant content with an average IC50 value of 256,723 ppm, chayote flour has a moderate antioxidant content with an average value of IC50 140,999 and chayote biscuits has a weak antioxidant content with the average value of IC50 is 179.619 ppm

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