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Dea Santika Rahayu
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ijose@untidar.ac.id
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INDONESIA
Indonesian Journal of Science and Education
Published by Universitas Tidar
ISSN : 25985213     EISSN : 25985205     DOI : https://doi.org/10.31002/ijose
Core Subject : Science,
Biochemistry, Genetics & Molecular Biology Chemistry Materials Science & Nanotechnology Physics
Indonesian Journal of Science and Education published a scientific paper on the results of the study and review of the literature in the science and education. In detail, the scopes of this journal are research in 1) Science education; 2) Biology education; 3) Physics education; 4) Chemistry education; 5) Science Educational Technology; 6) Environmental science; 7) Physics; 8) Chemistry; and 9) Biology.
Arjuna Subject : Umum - Umum
Articles 94 Documents
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The Development of human insulin precursor expressed from P.pastoris-X33 in a 10L-fermenter Puspitasari, Dian Japany
Indonesian Journal of Science and Education Vol. 7 No. 1 (2023): Indonesian Journal of Science and Education
Publisher : Universitas Tidar

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31002/ijose.v7i1.212

Abstract

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 Pichia pastoris 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 P.pastoris 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.
Development of Five-Tier Instruments to Identify Students' Misconceptions about Centripetal and Centrifugal Force Widia, Widia Dina Oktavia
Indonesian Journal of Science and Education Vol. 7 No. 1 (2023): Indonesian Journal of Science and Education
Publisher : Universitas Tidar

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31002/ijose.v7i1.215

Abstract

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.
Pisang Nangka (Musa paradisiaca) As An Alternative Media For Aspergillus niger Growth Firdha Rachmawati; Budiman; Sisna Imalda; Lilis Puspa Friliansari
Indonesian Journal of Science and Education Vol. 7 No. 2 (2023): Indonesian Journal of Science and Education
Publisher : Universitas Tidar

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31002/ijose.v7i1.231

Abstract

Nangka banana (Musa paradisiaca) is one of the most popular bananas in Indonesia. Therefore, the production of waste will increase along with the use of bananas. Nangka banana peel and flesh can be used as an alternative media for mushroom growth because of its high carbohydrate content. The purpose of this study was to observe the growth of Aspergillus niger on alternative media made from nangka banana with concentrations of 8%, 9%, 10%, 11% and 12% and to determine the optimum variation and concentration of alernative media. Aspergillus niger was grown on nangka banana flesh media, nangka banana peel media and mix of nangka banana peel and flesh as well as PDA (Potato Dextrose Agar) media as a positive control using the single dot method. Colony diameter and pigmentation were observed for five days. The variation of nangka banana mix media with a concentration of 12% is the optimum variation and concentration to grow Aspergillus niger. Keywords: Alternative media, Aspergillus niger, nangka banana
Developing of E-Module Diversity of Living Things Around in Improving Ereadiness of Distance Learning Students Nuryunita Dewantari; Dwi Winarsih
Indonesian Journal of Science and Education Vol. 6 No. 2 (2022): Indonesian Journal of Science and Education
Publisher : Universitas Tidar

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31002/ijose.v6i2.266

Abstract

This study aims to determine the feasibility of the e-module on the diversity of living things around in increasing distance learning e-readiness for students. This study uses a research and development approach. The development model used in this study is the ADDIE model (Analysis, Design, Development, Implementation, Evaluation). The research instruments used were pretest questions, posttest questions and questionnaires. The questionnaire used is the e-module validation questionnaire and the practicality questionnaire. The e-module validation questionnaire was filled out by experts and the practicality questionnaire was filled out by students who had used the e-module. Based on the results of the validation analysis carried out by experts, an average value of 3.74 was obtained with valid criteria, indicating that the developed e-module is feasible for use in learning. In addition, based on the results of the practicality questionnaire analysis that has been filled in by students who have used the e-module with percentage of 79.2% is obtained which means that the e-module that has been developed is practical for use in distance learning.
Motivation of Prospective Science Teacher While Reading Texts as a Part of Self-Regulated Learning: Study on Critical-Argumentation Reading Activities Bambang Subali; Siswanto Siswanto; Hartono Hartono; Masturi Masturi
Indonesian Journal of Science and Education Vol. 7 No. 1 (2023): Indonesian Journal of Science and Education
Publisher : Universitas Tidar

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31002/ijose.v7i1.314

Abstract

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.
Assessment of Factors Militating Against Agricultural Science Practical in Secondary Schools in Kwara State, Nigeria Kayode Ojo, Afolabi; Abdulkadir Ibrahim, Oba
Indonesian Journal of Science and Education Vol. 8 No. 1 (2024): Indonesian Journal of Science and Education
Publisher : Universitas Tidar

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31002/ijose.v8i1.489

Abstract

This study assessed the factors militating against agricultural science practical in secondary schools in Kwara State, Nigeria. A descriptive survey research design was used, and a sample of 478 agricultural science teachers was selected using multistage sampling techniques. Five research questions were raised and answered while five null hypotheses were formulated and tested at 5% level of significance. Data was collected through a self-developed questionnaire and analysed using frequency count, percentage, mean, and Pearson-Product Moment Correlation. The findings revealed that insufficient human resources, negative attitudes of learners, limited time, financial resources, and inadequate infrastructure were significant challenges impeding the successful implementation of agricultural science practical in secondary schools. The study recommends among others that government should prioritize the recruitment of qualified and experienced agricultural science teachers to teach agricultural science practical in secondary schools.
Potential Utilization of Lamtoro Leaves (Leucaena leucocephala) as Natural Coagulants Ismawati, Riva; Rina Rahayu; Rizqa Puspitarini
Indonesian Journal of Science and Education Vol. 7 No. 1 (2023): Indonesian Journal of Science and Education
Publisher : Universitas Tidar

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31002/ijose.v7i1.566

Abstract

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.
Identification of Students' Misconceptions using Four-Tier Diagnostic Assessment in Physics Learning Phase F Prastyo, Agung; Fithriyah, Hanun; Rahmawati, Alma Dias; Ekawati, Elvin Yusliana
Indonesian Journal of Science and Education Vol. 8 No. 1 (2024): Indonesian Journal of Science and Education
Publisher : Universitas Tidar

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31002/ijose.v8i1.569

Abstract

This research aims to identify students' misconceptions about momentum and impulse material using a four-tier diagnostic assessment instrument to implement learning evaluation in the Merdeka curriculum. This type of research is descriptive with a qualitative approach, with data collection techniques carried out through assessments and interviews. Interview data is used to reinforce assessment data. The instrument used in the study is a four-tier diagnostic test on momentum and impulse developed by the researchers. The results showed that 50% of students experienced misconceptions about momentum matter due to the assumption that if two objects move with the same kinetic energy should have the same speed so that the momentum of both objects can be determined by ignoring their velocity. Then, as many as 13. 9% of students experience misconceptions about the law of conservation of matter momentum because of students' assumptions that ignore direction on velocity vector quantities. In other physics concepts, some students are less careful in calculations. The results of this study are expected to be a reference for teachers in designing more meaningful Merdeka curriculum-based learning plans to help students better understand the concepts of momentum and impulse.
Implementation of Inquiry Learning Model with STEM Approach to Improve Student Science Literacy in Environmental Pollution Materials Rahman, Aulia
Indonesian Journal of Science and Education Vol. 7 No. 1 (2023): Indonesian Journal of Science and Education
Publisher : Universitas Tidar

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31002/ijose.v7i1.581

Abstract

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
The Effect of Project Based Learning Model on Science Literacy Skills of Grade V Elementary School Students Ali, Musfika
Indonesian Journal of Science and Education Vol. 8 No. 1 (2024): Indonesian Journal of Science and Education
Publisher : Universitas Tidar

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31002/ijose.v8i1.727

Abstract

This study aims to see the effect of project-based learning model in improving science literacy skills of elementary school students. This study used a non-equivalent control group research design with 56 samples divided into experimental and control groups. The instruments used were science literacy tests and observation sheets. The results of the pretest and posttest mean difference test of the control group using paired sample T-test. The results of data calculation obtained Sig. (2-tailed) of 0.000, p<0.05, so it can be concluded that there is a difference between the pretest and posttest results in the control group. The results of this test indicate that the treatment given to both the experimental and control classes has an effect on science literacy skills. It is concluded that the project-based learning model can effectively improve students' literacy skills based on the research conducted. The results of the analysis of science literacy skills of students whose learning uses project-based learning are higher than students who do not use project-based learning.

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