Jurnal Pena Sains
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DEVELOPMENT OF MAGAZINE AS A LEARNING MEDIA ON ENDOCRINE SYSTEM
Full text linkThe magazine is one of the learning media that is rarely used in school. This research aimed to know the feasibility of endocrine system magazines and examine the learners' response to magazines as the media. This type of research is research and development. Five expert judgments tested the feasibility of the magazine. The aspects that were assessed were the material and media aspects. The product trials were done on nine students—the responses measured included cognitive, affective, and conative. The result of this research showed, on the feasible test CVR score of the material and media aspects was 1. Moreover, the CVI score was one as well. On the product trial, the score for cognitive aspect 85,18%, affective 83,33%, conative 87,77%, and the average responses 85,42%. It can be concluded that endocrine system magazine was feasible as learning media. Furthermore, magazines as a media gained a positive and strong response. So magazines can be a choice of media that can help learning activities
CHARACTERIZATION OF XILANASE ENZYMES OF BACILLUS SUBTILIS AS A BIOBLEACHING AGENT
Full text linkXylanase can be used as an alternative material in the pulp bleaching process to reduce the use of chemicals in the paper industry. Bacillus subtilis is a type of bacteria that can produce xylanase. Xylanase characterization is needed to determine the maximum activity that will be used in the pulp bleaching process. This study aims to determine the xylanase characterization of Bacillus subtilis in terms of optimal pH, optimal temperature, carbon source, and optimal nitrogen source. The research material used was a pure culture of Bacillus subtilis bacteria obtained from the Biochemistry Laboratory of the Department of Chemistry, Faculty of Mathematics and Natural Sciences, Brawijaya University. The characterization of the xylanase enzyme was carried out using the RAL method. The results of characterization of the determination of pH, temperature, carbon source, and nitrogen xylanase source from Bacillus subtilis showed that the optimum conditions for xylanase were at pH 7 with a maximum activity of 5.085 U / mL; the optimum temperature at 40oC with activity 8.017 U/mL; maximum carbon source at a concentration of 15% (b/v) with activity 7.517 U/mL; and the optimum source of nitrogen with a concentration of 0.17% (b/v) with an activity of 4.815 U/mL
VALIDITY OF DISASTER E-BOOK TO IMPROVE DISASTER LITERACY SKILLS AT JUNIOR HIGH SCHOOL
Full text linkNatural disasters in Indonesia constantly occur every single year and have adverse effects. In order to minimize those negative effects, it is crucially needed to increase disaster literacy in the society, which starts from the students. To improve disaster literacy, students must be assisted with teaching materials that focus on disaster material, such as disaster education e-books. Disaster education e-books are teaching materials that contain the vibration, waves, and disaster materials combined with a webbed integration model. This research aimed to measure the validity level of the developed disaster education e-book. The research method applied was research and development with the 4D development model proposed by Thiagarajan et al. (1974). However, this research did not reach the disseminating stage, so the development model used became a 3D model consisting of defining, designing, and developing stages. Validation questionnaires were used to measure product validity, and these questionnaires were assessed by two expert lecturers and three science teachers. The development of teaching materials in the disaster education e-books form scored 81%, and it was categorized in the valid category. As a result, the disaster education e-book developed was valid for use at the junior high school level
PROFILE OF SCIENTIFIC LITERACY BASED ON DAILY LIFE PHENOMENON: A SAMPLE TEACHING FOR STATIC FLUID
Full text linkThe purpose of this study is to describe the daily phenomenon-based physics literacy profile in static fluid material to find out how far the students' abilities about scientific science. Previously, the development of a daily phenomenon-based scientific literacy test instrument adjusted to the scientific literacy competency indicators and the applicable curriculum was carried out. This study used a quantitative descriptive method with a Research and Development model and is conducted on 40 students of SMAN 4 Sidoarjo at XI-MIPA class. The assessment instrument developed is stated theoretically and empirically valid. The theoretical validity is 83% which includes material, construct, and language criteria. The empirical validity includes the reliability test with a reliability coefficient of 0.782 (reliable). The item validity test states 15 valid questions with low to very high categories, the difficulty level with 13 moderate questions, and the distinguishing power with 13 questions in the sufficient to good category. Of the four categories of practical feasibility, 12 questions out of 15 (80%) met the criteria and were eligible to be tested. The categories of each indicator of scientific literacy competence are indicators that explain phenomena scientifically in the moderate category (63.0%), indicators of evaluating and designing scientific investigations in the very low category (43.7%), and indicators of interpreting data and evidence in the very low category (52.7%). It can be concluded that the average percentage of students' physics science literacy ability is 53%, which is included in the very low category
THE IMPLEMENTATION OF INQUIRY LEARNING ON STUDENTS' LEARNING OUTCOMES AND CRITICAL THINKING SKILLS IN THE DIGESTIVE SYSTEM MATERIAL
Full text linkThis research is aimed to determine the students’ achievement and critical thinking on the digestion system topic. This study was conducted using a quasi-experiment with a control group pre-test and post-test design. Furthermore, the samples were chosen using the purposive sampling technique. The instrument consisted of 20 multiple-choice tests. Findings indicate that the average student achievement is 16.71 in the experiment and 12.92 in the control class. The t-test also can be known as t-count t-table (1.71 1.68), which means a significant difference between experiment average and control average. Based on the test result in the experiment class, it can be assumed that there is an enhancement of the average percentage of students' critical thinking from 63% to 84%. Thus, it can be concluded that inquiry learning model can increase the students’ achievement and critical thinking
REDUCTION OF STUDENT MISCONCEPTIONS: APPLICATION OF TTW-PBL LEARNING WITH CHEMICAL REPRESENTATION ON BUFFER SOLUTION MATERIALS
Full text linkThe research was conducted on the chemical representation of buffer solution learning through multi-model TTW-PBL learning to determine the understanding of chemical representation and reduce students' misconceptions. The method used is a quasi-experimental design with a non-equivalent control group. The samples of this study were students of class XI MIPA 1 as the experimental class and XI MIPA 3 as the control class at SMAN 11 Banjarmasin. The independent variables are the TTW-PBL learning model in chemical representation and the PBL model in chemical representation. In contrast, the dependent variable is the understanding of chemical representations and misconceptions. The data analysis technique used descriptive and inferential analysis techniques. Descriptive analysis was used to find out the differences in students' misconceptions. The inferential analysis uses a t-test to analyze differences in understanding of chemical representations. The results showed significant differences in the understanding of chemical representation in the class using the multi-model TTW-PBL and PBL model with a value of tcount ttable = 2.15 1.99 and the percentage of misconceptions of 16.57% and 23.24%, respectively. Finally, TTW-PBL learning with Chemical Representation can reduce students misconception
THE EFFECTIVENESS OF CREATIVE PROBLEM SOLVING ON LOGICAL THINKING ABILITY AND MASTERY OF CONCEPTS
Full text linkThis research aims to determine the effect of Creative Problem Solving (CPS) on logical thinking ability and concept achievement. The design was a nonequivalent pretest-posttest control group design. The samples were 60 students of X MIA 1 and X MIA 3 selected through cluster random sampling technique. Data on logical thinking ability obtained using the Test of Logical Thinking (TOLT and data on concept achievement (cognitive aspects) gathered using pretest and posttest. Both data were analyzed by Independent Sample t-Test at a 5% confidence level. The results showed that CPS give effect significantly the experimental class logical thinking ability (0.41± 0.13) was higher than the control class (0.21 ± 0.07). The mastery of concepts on the experiment class (0.61 ± 0.20) higher than the control class (0.41 ± 0.20). It means that CPS influences students’ logical thinking ability and mastery of concepts
RELATIONSHIP BETWEEN THE PERCEPTION AND SKILLS OF STUDENT BASIC SCIENCE PROCESS IN THE USE OF M-MODULE IN BASIC PHYSICS PRACTICUM
Full text linkThis study aims to determine the relationship between perception and basic science process skills through the use of the m-module in basic physics practicum II. This research is a quantitative study using correlational design. data collection instruments used in the form of perception questionnaire instruments and observation sheets to measure students' science process skills. This study used a sample of 36 physics students at Universitas Jambi. The results of the study will be analyzed using descriptive statistics and inferential statistics. The results of this study indicate that students give a good perception of the use of the m-module in basic physics practicum II. Flat mirror material is proven from the value of the perception of 63.9% in the good category according to a predetermined range. And the basic science process skills of students are in a good category with a percentage of 50.0%. Pearson correlation results show the number 0.756 and sig 0.05 which is 0.00, this shows that there is a strong relationship between perceptions and students' science process skills in using the m-module. This means that a high perception will result in high science process skills
THE EFFECT OF PROJECT-BASED LEARNING TOWARDS SCIENCE LITERATION OF ELEMENTARY SCHOOL STUDENTS
Full text linkThis research aims to investigate the effects of Project-Based Learning towards Science Literation of Elementary School Students. Students on fifth-A grade and fifth-B grade Ma'arif Al-Fattah Elementary School Surabaya in the academic year 2018-2019 conducted this research, with fifth-A grade population as the control class and fifth-B grade population as the experimental class. This research is quantitative research with a Paired Sample T-test analysis, where the independent variable is Project-Based Learning and students' Science Literacy skills as a dependent variable. Data analysis shows that t arithmetic t table is 21,308 1,705, so rejected Ho and accepted Ha. Sig. (2-tailed) 0,000 0.05, so rejected Ho and accepted Ha. This research concludes that there is a significant effect of Project-Based Learning on elementary school students' scientific literacy skills
DEVELOPMENT OF BIOLOGICAL ASSESSMENT BASED ON STUDENT CRITICAL THINKING SKILLS: a case study in eleventh grade at MAN 2 Palembang
Full text linkThis study aims to determine the characteristics and feasibility of biology assessment based on critical thinking skills. This research is a research and development that adapts to the McIntire Miller development model. The sample used in the first trial was 80 students, and in the second trial were 76 students. Data collection techniques using questionnaire sheets, questionnaire sheets, interview sheets, test instruments in the form of essay questions of biology grade XI based on critical thinking from Facione with indicators: interpretation, analysis, evaluation, explanation, conclusions, and self-regulation. Techniques of data analysis using qualitative analysis and quantitative analysis. The results of this study were in the form of a biology assessment based on critical thinking skills in the form of essays in odd semester XI material and from the results of the 1st and 2nd trials totaling 24 items. The content validity of biology assessment based on critical thinking skills is qualified to very high. The construct validity the items are 28 questions valid (1st trial) with reliability value is 0.875. Furthermore, 24 questions are valid (2nd trial) with reliability value is 0.764. The results of the level of difficulty test are 0.332 (1st trial) and 0.537 (2nd Trial). The value of discriminating power is 1,541 (1st trial) and 2,021 (2nd trial). The data shows that the items can be used to measure students' critical thinking skills. We can involve the mental processes of pupils by the test based on critical thinking skills