Salah satu pengaruh penggunaan radiasi gamma dalam kesehatan yaitu penggunaan radiasi gamma untuk radioterapi. Radikal bebas dapat muncul dalam tubuh karena penyerapan energi radiasi dan dapat merugikan organ lain di sekitar target penyinaran. Penelitian ini bertujuan untuk menyelidiki pengaruh paparan radiasi gamma terhadap organ hati mencit dan karakter hepatoprotektif ekstrak kulit manggis (Garcinia mangostana l) untuk mereduksi kerusakan sel. Penelitian dilakukan dengan cara memvariasikan dosis ekstrak kulit manggis yang diberikan ke mencit disertai pemberian paparan radiasi gamma dengan dosis 268 μSv selama 14 hari. Setelah pemberian perlakuan, dilakukan pengukuran kadar Serum Glutamic Pyruvic Transaminase (SGPT) dan banyaknya kerusakan sel dari preparat histopatologis. Analisis data menunjukkan bahwa kadar SGPT turun sebesar 50,97 U/L. Penurunan kadar SGPT menunjukkan ekstrak kulit manggis mempunyai karakter hepatoprotektif yaitu mereduksi kerusakan sel hati karena paparan radiasi gamma.
This study aims to describe the results of the application of the discovery learning model on the subject matter of light in class VIIIC students of SMP Negeri 8 Kupang even semester of the 2019/2020 academic year. This research is descriptive. This research was conducted at SMP Negeri 8 Kupang for the 2019/2020 school year. The subjects in this study were researchers and 22 students of class VIIIC at SMP Negeri 8 Kupang, even semester, 2019/2020 academic year. The techniques used to collect data in this study are observation and tests. Based on the results of the descriptive analysis of the research data, it shows that in general, the application of the discovery learning model for the subject matter of light for students is optimal. In detail, the researcher's ability to manage to learn is obtained which includes: planning, implementing, and evaluating learning, including in the good category. The learning outcomes test (THB) of students for cognitive learning outcomes tests on learning implementation activities which include: preliminary activities, core activities, closing activities, time allocation, and class atmosphere are all in the very high category and cognitive achievement for each lesson plan is all complete.
This study aims to develop a two-level Natural Science (IPA) test instrument based on the jumanji game in measuring understanding of the concept of work and simple planes. The research method in this case is a quantitative method with a modification of the development model. The measurement instrument developed in this study is a two-level science test or a reasoned multiple choice test specifically for the business chapter and simple planes. This research instrument that has been developed was tested on 256 students of SMP Abu Bakar. The results of this study indicate that a measurement instrument has been produced in the form of a two-level science test based on the jumanji game which can measure students' understanding of concepts about business and simple and reliable machines that are valid and reliable. These results are evidenced by the validity and reliability of the two-level science test, which are 0.83 and 0.53 respectively. Meanwhile, the achievement of students' understanding of concepts related to business and simple machines is 51% which is in the high category. The students' conceptual understanding measured using the two-level science test is high because it exceeds the minimum criteria that have been determined.
This study aims to create STEM-based science teaching materials based on simple electrical circuits and determine the feasibility of STEM-based teaching materials. Research and development of the Dick & Carey model is the type of research used. The research process comprises four stages: needs analysis, product design, validation and evaluation, and testing. Material experts, presentation experts, linguists, and graphic experts are all involved in expert validation. Teachers who teach science subjects participate in the product feasibility test. Individual, small group, and field trials assess students’ readability. Expert validation revealed that the content aspect was 97.7 % with a very decent category, the presentation aspect was 97.7% with a very proper category, the language aspect was 85% with a very decent category, and the visual aspect was 80 percent with a worthy category. The science teacher’s feasibility test results showed that the content aspect was 90 % with an excellent category, the presentation aspect was 98.6% with an outstanding category, and the language aspect was 96.7% with a superior category. Students’ readability test results showed an average score of 87.7% in the excellent category. Based on the validation and legibility trials findings, developing STEM-based science teaching materials (Science, Technology, Engineering, and Mathematics) on simple electrical circuit materials is feasible. It can be used as a learning resource.
Penelitian ini memiliki tujuan untuk menguji kelayakan modul pembelajaran fisika berbasis kinesthetic, intellectual, visual, auditory, repetition untuk mengukur keterampilan pemecahan masalah pada materi Suhu dan Kalor tingkat sekolah menengah. Penelitian ini menggunakan desain penelitian Research and Development (R & D) dengan model prosedural. Kelayakan modul dianalisis melalui validasi materi, bahasa, kegrafisan, pembelajaran dan penyajian oleh para ahli, guru, dan teman sejawat. Pelaksanaan validasi dilakukan melalui penilaian modul menggunakan lembar penilaian validasi. Data hasil validasi dianalisis secara kuantitatif untuk mengetahui presentase dan kategori kelayakan modul. Berdasarkan hasil analisis data, diperoleh presentase rata-rata kelayakan modul pada aspek materi mencapai 78,82%, bahasa 81,25%, kegrafisan 95,54%, serta pembelajaran dan penyajian 87,07%. Skor rata-rata ideal 84,01% dan presentasenya lebih besar dari presentase natural cut of point. Melalui analisis data dan pembahasan, dapat disimpulkan bahwa modul pembelajaran fisika berbasis kinesthetic, intellectual, visual, auditory, repetition, layak diujicobakan dalam skala kecil di sekolah.
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