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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 13 Documents
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Search results for , issue "Vol 19 No 1 (2023)" : 13 Documents clear
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
Analisis Kesalahan Siswa dalam Menyelesaikan Soal Cerita Persamaan Nilai Mutlak Berdasarkan Kriteria Watson Kelas X SMA Negeri 1 Sarudu Musdalifah Musdalifah; Bakri M; Sutji Rochaminah
Media Eksakta Vol 19 No 1 (2023)
Publisher : Universitas Tadulako

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22487/me.v19i1.3472

Abstract

This study aims to obtain a description of the types of errors made by class X students of SMA Negeri 1 Sarudu in solving absolute value equation word problems based on Watson's criteria. This type of research is descriptive research with a qualitative approach. The subject of this research was taken by three students out of 18 students consisting of two students who made many mistakes and one who made few mistakes. The results of this study were (1) the types of errors made by subjects who made the first mistake in solving absolute value equation word problems were inappropriate procedure, and omitted conclusion. (2) the type of mistakes made by subjects who make a lot of second mistakes in solving the absolute value equation story problem is inappropriate data, undirected manipulation, and omitted conclusion. (3) the types of mistakes made by the subjects who make few mistakes in solving the absolute value equation story problem are inappropriate procedure.
Uji Daya Simpan Biskuit Dari Formulasi Campuran Tepung Labu Siam (Sechium Edule) dan Kacang Hijau (Vigna Radiata) Mulyati Mulyati; 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.v19i1.3478

Abstract

The study aims to determine the shelf life of biscuits from a mixture of chayote flour (Sechium edule) and mung bean (Vigna radiata) flour. The samples used in this study were biscuits made from chayote flour (Sechium edule) and Mung beans (Vignaradiata). This research was carried out in June-September 2020 which began with the manufacture of biscuits from the formulation of chayote flour and Mung beans.  Data analysis for estimating the shelf life of biscuits using the Arrhenius method. The results of the research using the ASLT method. Based on the results obtained, the shelf life of biscuits from a mixture of chayote flour (Sechium edule) and Mung bean (Vignaradiata) formulation was the highest, obtained by 100% chayote flour at 25 oC for 177 days. The highest 100% Mung beans were obtained at 25 oC for 176 days. The highest 50% chayote flour and 50% Mung beans were obtained at 25 oC for 187 days. The highest 75% chayote flour and 25% Mung beans were obtained at 25 oC for 170 days. The highest 25% chayote flour and 75% mung bean were obtained at 45oC for 195 days
Instrumen Gaya Berpikir: Membantu Adaptasi Kognitif dalam Penyelesaian Masalah Fisika Haeruddin Haeruddin; Jusman Jusman; Nurjannah Nurjannah; Muhammad Zaky
Media Eksakta Vol 19 No 1 (2023)
Publisher : Universitas Tadulako

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22487/me.v19i1.3484

Abstract

This study aims to develop an instrument to measure thinking styles and their impact on cognitive adaptation in the context of physics problem solving. Understanding how individuals approach and solve physics problems can provide valuable insights into cognitive processes and strategies used. The instrument consists of various tasks designed to depict different thinking styles commonly employed in physics problem solving. These thinking styles include concrete sequential (CS), abstract sequential (AS), concrete random (CR), and abstract random (AR) thinking styles. This research follows the Research and Development (R&D) model. The development model used is the non-test instrument development model. The instrument utilizes a forced-choice model by asking respondents to determine the order of statements that best align with their condition when solving physics problems. The instrument provides four options ranging from very inappropriate to very appropriate. A total of 683 first-year students at Universitas Tadulako participated in the pilot study, and 364 in the implementation study. The expert judgment data analysis technique used the Aiken's formula. Empirical data analysis was conducted using the Ques program to test goodness of fit to the Partial Credit Model (PCM), item validity, and instrument reliability. The content validity result showed an Aiken's V value of .81, and the test reliability was .90. The average infit MNSQ value was 1.00 with a standard deviation of .18. This study found that physics education students at Universitas Tadulako tend to have an abstract sequential (AS) thinking style. The implications of these findings can be utilized to measure students' thinking style tendencies when solving physics problems.
Development of Practicum Tools for Measuring Temperature and Air Humidity Based on Microcontroller by Telemetric Muhammad Zaky; Nita Carolina; Unggul Unggul
Media Eksakta Vol 19 No 1 (2023)
Publisher : Universitas Tadulako

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22487/me.v19i1.3485

Abstract

The purpose of this research is to make a temperature measuring instrument for air temperature and humidity on the device using the DHT11 sensor as a temperature and humidity sensor for the object under study, the ATMega328P CH340G microcontroller as data processing and the Bluetooth HC-05 module as an intermediary communication between the device and a smartphone. , utilizing App Inventor technology as a means of information quickly and accurately. The research method used in this study is the research and development method or known as research and development (R&D). This measuring tool is made using the Arduino Uno R3 module, which is programmed using the Arduino programming language. Based on the results of the study, it can be concluded that: 1) The measuring instrument is designed to be able to measure temperature and humidity in a place/room continuously, 2) the system can provide precise and accurate information on the temperature and humidity of the device to the user. The additional result is that apart from practical measuring tools it can also be used as a wireless monitoring tool for temperature and humidity for swiftlet houses which is useful for solving temperature and humidity problems in swiftlet houses as well as outputs of Intellectual Property Rights Products.

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