Indonesian Journal of Science and Education
https://journal.untidar.ac.id/index.php/ijose
<p><em>Indonesian Journal of Science and Education </em>published a scientific paper on the results of the study and review of the literature in the science and education.</p> <p>In detail, the scopes of this journal are research in<br />1) Science education;<br />2) Biology education;<br />3) Physics education;<br />4) Chemistry education;<br />5) Science Educational Technology;<br />6) Environmental science;<br />7) Physics;<br />8) Chemistry; and<br />9) Biology</p>Universitas Tidaren-USIndonesian Journal of Science and Education2598-5213Development of Five-Tier Instruments to Identify Students' Misconceptions about Centripetal and Centrifugal Force
https://journal.untidar.ac.id/index.php/ijose/article/view/215
<p>The purpose of the study was to determine the development process and the feasibility of a five-tier diagnostic test instrument to identify students' misconceptions about centripetal and centrifugal forces. This research is a type of Research and Development (R&D) with the development model used, namely the 4D (Four-D) development model. This study uses the R&D method because the results of this study are in the form of a diagnostic test instrument to identify misconceptions in the learning process, and to find out the main source of the causes of misconceptions. The results of the diagnostic test of students who have misconceptions about centripetal and centrifugal forces are 20.31%.The percentage of false positive is 9.62%, the false negative is 8.49 and the Lack of Knowledge is 16.97%. From the percentage results obtained that the false positive (FP) and false negative (FN) values are valid because <10%.The results of the validity test on the instrument are said to be valid because >0.3 and the results of the reliability test are Cronbach's Alpha value obtained at 0.715 from 7 item questions. So this instrument can be said to be reliable because the Cronbach's Alpha value is classified as high based on the reliability criteria.</p>Widia Dina Oktavia Widia
Copyright (c) 2023 Indonesian Journal of Science and Education
2024-03-232024-03-2371364510.31002/ijose.v7i1.215Gas Chromatography Mass Spectroscopy (GCMS) Qualitative Analysis for Morphine, Heroin and Codeine used in Doping
https://journal.untidar.ac.id/index.php/ijose/article/view/207
<p style="font-weight: 400;">Three types of doping drugs, morphine, heroin, and codeine were analyzed qualitatively in urine using GCMS: HP5MS column containing a nonpolar substance, phenylmethyl siloxane, with a temperature range of 90-250ºC and a rate of increase of 10ºC/minute. Diethyl ether was used to extract morphine, codeine, and heroin. The extractions were performed at pH 8, the organic phase was evaporated, followed by derivatization. Morphine and its derivatives were treated with a solution of N-methyl-N-trimethylsilyl-trifluoroacetamide and N-methyl-bis-trifluoroacetamide. The results of the gas chromatographic analysis showed that the retention times of morphine, heroin, and codeine the retention times were 8.01, 7.32, 6.21 minutes, while those of their derivatives were 8.10, 8.10, 7.95 minutes respectively. The identification of each drug using mass spectrometry revealed that their mass spectra were identical to the standard. The mass spectra of the derivatives: morphine-TMS and codeine-TMS showed a resemblance index of 93% respectively compound to the standard, with a detection limit of 2 ug/ml.</p>Ayu Nala El Muna HaerussanaMimin KusmiyatiIrvan Herdiana
Copyright (c) 2023 Indonesian Journal of Science and Education
2023-04-222023-04-2271293510.31002/ijose.v7i1.207The Development of human insulin precursor expressed from P.pastoris-X33 in a 10L-fermenter
https://journal.untidar.ac.id/index.php/ijose/article/view/212
<p>Human insulin is a hormone that regulate blood glucose in human. Due to the vital role of insulin and the trend of diabetic case globally, insulin demand has been rise in the world. Indonesia as a country that had diabetic patient more than 10 million people in 2017 is still imported raw material of human insulin. The development of production process of human insulin is needed in order to support government objective to be independence in medicine aspect. Human insulin precursor (HIP) expressed from a <em>Pichia pastoris</em> X33/pD902-IP had been developed and optimised in a small scale. However, the scaling up in fermenter 10L has not been studied. Using a 10L-fermenter the fermentation system of <em>P.pastoris</em> X33/pD902-IP was developed. Fermentation done in 120 hours using a basal salt medium (half concentration) for the vegetative and induction media. To induce HIP expression, methanol is fed by pulse strategy with a gradient concentration 1-3% for 48 hours. The dry cell weight (DCW) and HIP titer were 72 g/L and 192 mg/L, respectively. This development is the first fermentation process of HIP in fermenter 10L in Indonesia.</p>Dian Japany Puspitasari
Copyright (c) 2023 Indonesian Journal of Science and Education
2023-04-182023-04-1871242810.31002/ijose.v7i1.212Motivation of Prospective Science Teacher While Reading Texts as a Part of Self-Regulated Learning: Study on Critical-Argumentation Reading Activities
https://journal.untidar.ac.id/index.php/ijose/article/view/314
<p>Reading is an important activity that must be present in the science learning process, especially reading with meaningful activities, one of which is critical argumentation reading activity. Reading is very closely related to student motivation while reading. This motivation plays an important role in supporting the success of reading goals. So far, research related to students' reading motivation has rarely been carried out, especially for critical argumentation reading activities. Most of the research was conducted at the elementary and secondary school levels. Therefore, this research will be conducted with the aim of analyzing students' motivation while reading using critical argumentation activities. This study involved 83 science teacher candidate students. In practice, students were divided into three classes, namely group experimental class (N = 29), individual experimental class (N = 29), and control class (N = 25). The research was conducted using the think aloud protocol method, in which students were asked questions while reading the text, and recorded all the answers orally. The results showed that students' motivation during reading as part of a self-regulation strategy showed better results when students read using the critical argumentation reading model. In addition, students are able to carry out self-regulation strategies from a better motivational aspect if reading activities are carried out in groups.</p>Bambang SubaliSiswanto SiswantoHartono HartonoMasturi Masturi
Copyright (c) 2023 Indonesian Journal of Science and Education
2023-04-152023-04-1571172310.31002/ijose.v7i1.314Implementation of Inquiry Learning Model with STEM Approach to Improve Student Science Literacy in Environmental Pollution Materials
https://journal.untidar.ac.id/index.php/ijose/article/view/581
<p><em>The study aims to improve the learning process that has been carried out with the aim of increasing students' scientific literacy on environmental pollution topic using the inquiry learning model with a Science, Technology, Engineering, and Math (STEM) approach. This research is Classroom Action Research (CAR). The subjects of this study were 34 students in class VII Semester 1 of 2022 at SMPN 6 Lembah Gumanti, Lembah Gumanti District, Solok Regency. This study consisted of 2 cycles with 4 stages, namely: planning, implementation, observation and reflection. Data collection techniques in this study are preliminary data, observations and written tests to measure scientific literacy skills in the form of knowledge (knowledge), competence (competences), and context (context) aspects collected using science literacy ability tests while attitude (attitudes) data is collected by using angket. Based on the results of the research carried out, the average score at cycle I was 67,06 and at cyclus II 85,88 so it can be concluded that the inquiry learning model with the STEM approach can improve student science literacy on environmental pollution materials</em></p>Aulia Rahman
Copyright (c) 2023 Indonesian Journal of Science and Education
2023-04-152023-04-157171610.31002/ijose.v7i1.581Potential Utilization of Lamtoro Leaves (Leucaena leucocephala) as Natural Coagulants
https://journal.untidar.ac.id/index.php/ijose/article/view/566
<p>Water is a vital element for human beings. However, there are still limited clean water services in Indonesia. Raw water treatment is needed to ensure the availability of clean water. One of the methods is by using the coagulation process. The coagulant functions to speed up the coagulation process. Although effective in water treatment, chemical coagulants have some disadvantages. Therefore, it is necessary to develop natural coagulants to overcome the weakness of chemical ones. Natural ingredients can be used as coagulants if they have many macromolecules. Lamtoro leaves are one of the natural materials that are only used to feed the animal. This research aims to examine the potential of lamtoro leaf as a natural coagulant in terms of its content. The research is conducted by testing lamtoro leaf powder using Fourier Transform Infrared Spectroscopy and proximate test. Infrared spectra of lamtoro leaves show the presence of absorption peaks for specific groups of carbohydrate and protein compounds. The proximate test results show that lamtoro leaves contain 24.7% protein and 53.71% carbohydrates. The high protein and carbohydrate contents in lamtoro leaves enable them to be used as a natural coagulant.</p>Riva IsmawatiRina RahayuRizqa Puspitarini
Copyright (c) 2023 Indonesian Journal of Science and Education
2023-04-022023-04-02711610.31002/ijose.v7i1.566