PHYTOCHEMICAL SCREENING AND GASS CROMATOGRAPHY – MASS SPECTROMETER (GC-MS) ANALYSIS ETHANOL EXTRACT OF PURPLE SWEET POTATO (Ipomoea batatas L.)

Purple sweet potato (Ipomoea batatas L.) leaves are extremely versatile that possesses high value. Sweet potato (Ipomoea batatas L.) leaves have secondary metabolism compounds that used as antibacterial and antifungal. The content of secondary metabolite compounds contained in plants an important role in providing antibacterial and antifungal activity so that this study was conducted to develop the utilization of purple sweet potato leaves through phytochemical screening. Phytochemical screening aims to provide an overview of the class of compounds contained in purple sweet potato leaf plants including of alkaloids, steroids-triterpenoids, saponins, flavonoids, and tannins test. Samples were taken from the local community of Bogor. The extract is made by extracting the simplicia of positive purple sweet potato leaves containing alkaloid, steroids-triterpenoids, saponins, flavonoids, and tannins. Further identification of active compounds was performed by Gass Cromatography-Mass Spectrometer (GC-MS) analysis to detect the active compound contained in purple sweet potato leaf extract more specifically. GC-MS analysis results show several active compounds including: 1.4-Benzenediol (CAS) Hydroquinone, Benzenesulfonic acid 4-hydroxy (CAS), Hexadecanoic acid (CAS) Palmitic acid

The Development of Interactive Multimedia Based on TPACK to Enhance Students' Science Process Skills on Living Cell Matter

This work aims to create interactive multimedia based on TPACK to enhance students' science process skills (SPS) on living cell matter. It offers an alternate method of learning that relies on creating and applying information technology to achieve learning goals (SPS). The ADDIE paradigm was utilized in the research and development process to create Interactive multimedia. These steps are Analysis, Design, Development, Implementation, and Evaluation. The Interactive Multimedia development product was determined to be possible to be incorporated into a learning product based on the research findings and several validation and implementation tests carried out during the development process. The Interactive Multimedia is practicable, as evidenced by the percentage of data collected from the validator and the outcomes of the implementation test to the pupils. The students' SPS N-Gain analysis results obtained a score of 0.78 in the high category. In other words, a product that has undergone testing and validation may be one that can be used to aid in learning about living cells and can enhance students' science process skills

Assessment for Learning: Changes in the Role of Assessment in Learning

The purpose of this research is to describe the state of assessment for learning (AfL) in science learning. The research was conducted in February 2021. This research was conducted with a descriptive method using data collection techniques, namely a survey via google form. Before the instrument is used, calibration and testing are carried out and the test results of all items are declared valid and reliable. The results showed that the teacher agreed to the use of Assessment for Learning (AfL) in science learning, which could activate the learning process and accelerate the achievement of goals. In addition to the use of Assessment for Learning (AfL) in science learning, teachers also answered effectively in developing students' literacy skills according to subject coverage. Assesment for Learning (AfL) provides an overview of how students learn and achieve learning goals effectively that can be reported to students' parents. The obstacle in implementing assessment for learning (AfL) is that teachers still find it difficult to compile and develop assessment-based learning designs that are in accordance with process standards, so that most of these teachers adopt learning designs that are already available from various sources, so that the role of assessment is not yet a an integral part of the teaching and learning process

Penerapan Model Pembelajaran Jigsaw Dengan Pendekatan Scientific Untuk Meningkatkan Hasil Belajar IPA

The research is a classroom action which is aimed at improving the learning outcome of natural science subject with the research subjects of 42 students at class VIII-5. The research was done in two cycles. Each cycle has 4 steps, namely: planning, doing, observing, and reflecting. At the end of each cycle, there was a test with the instruments that had been validated and tested for its reliability. Based on the result of reflection of the previous year, the average score was 66,12 and the percentage of students achieving the score above the minimum was 45,24%. When Jigsaw model combined with the scientific approach were conducted, the average score and the percentage improved. At the first cycle, the average score of IPA subject with the aspect of cognitive reached 70,56 and the percentage of students getting the score above the minimum was 64,29% and at the second cycle, it improved into 75,32 and the achieving percentage was 80,95%. The learning result from the aspect of attitude was 61,90% the students got good category for the first cycle, while in the second cycle, the percentage of students getting good category 76,19%. The learning outcome from the aspect of skill reached 57,14% of students getting high category was. Second treatment at the first cycle was 61,90%, first treatment in the second cycle was 66,67%, second treatment in the second cycle was 76,19 and the third treatment in the second cycle was 78,57%, the students got high category. This result shows that the implementation of Jigsaw model with scientific approach can improve students learning outcome of natural science class at class VIII-5 SMP Negeri 2 Cicuru

Model Pembelajaran Problem Based Learning dan Guided Discovery Learning Berbantu Media Pembelajaran Muvis Terhadap Literasi Sains

The research is aimed at finding out the difference of science literacy between the students of three classes with the learning models of Problem Based Learning (PBL) and Guided Discovery Learning (GDL) in the material of Life Organization using the media of Music and Video of Science (Muvis). It involved two classes: an experimental class and a control class. The population was students of SMPN 18 Bogor grade VII. The technique employed for taking the sample was Purposive Sampling. The sample used was the class of VII-A as the experimental class I. they were treated by Problem Based Learning (PBL) model and Muvis with the number of the students reached 35 students, the class of VII-B as the experimental class II was treated by Guided Discovery Learning (GDL) model and Muvis and the number of the students was 36 students. The last, the class of VII-C was made as the control class with no innovative treatment and they were 36 students. The test of ANAVA in the significant level of α = 0,05 showed that the value of Fobserved for science literacy was 52 and Ftable was 3,07, thus the value of Fobserved more than Ftable. Based on the result, the null hypothesis (H0) is rejected and the working hypothesis (H1) is accepted therefore, it can be concluded that there is difference of science literacy between PBL Muvis, GDL Muvis and the control class. The implementation of GDL Muvis in the class gave better influence to the science literacy compared to the implementation of PBL Muvis in another class and the control class with the average score of N-Gain 57

Inventarisasi Keanekaragaman Echinodermata Di Pantai Seupang Sebagai Media Pembelajaran Biologi

Penelitian ini bertujuan untuk mempelajari keanekaragaman Echinodermata di Pantai Seupang dan menyusun media booklet dari hasil inventarisasi keanekaragaman Echinodermata. Penelitian ini dilaksanakan pada bulan Januari-Juli 2020, menggunakan metode eksplorasi dengan teknik purposive sampling, menggunakan tiga stasiun pada titik yang paling mewakili untuk diteliti. Data yang diambil berupa data primer (jumlah spesies dari filum Echinodermata di dalam setiap stasiun) dan data lingkungan berupa pH, salinitas, suhu, dan kuat arus dan substrat. Berdasarkan penelitian ditemukan enam spesies dari tiga kelas yaitu Ophiuroidea, Echinoidea dan Holothuroidea. Indeks kemerataan tergolong sedang dengan nilai rata-rata 0,52 dan indeks dominansi tergolong sedang dengan nilai rata-rata 0,54. Sementara indeks keanekaragaman di Pantai Seupang tergolong rendah dengan rata-rata nilai 0,88. Hal ini berarti Echinodermata yang ditemukan di Pantai Seupang tergolong merata dan tidak ada spesies yang mendominasi antar spesies satu dengan yang lainnya. Hasil validasi kelayakan media booklet menunjukkan bahwa booklet layak digunakan sebagai media pembelajaran biologi pada materi kingdom animalia. Kata kunci: Echinodermata, booklet, kingdom animali

HUBUNGAN ANTARA PENGUASAAN KONSEP PENGELOLAAN SAMPAH DENGAN PERILAKU RAMAH LINGKUNGAN

Penelitian ini merupakan penelitian Mixed Methods Explanatory kuantitatif-kualitatif yang terdiri dari variabel bebas yaitu penguasaan konsep pengelolaan sampah (X) dan variabel terikat yaitu perilaku ramah lingkungan siswa di SMK Wikrama Bogor (Y). Penelitian ini bertujuan untuk mendeskripsikan hubungan antara penguasaan konsep pengelolaan sampah dengan perilaku ramah lingkungan siswa di SMK Wikrama Bogor. Penelitian ini dilaksanakan pada bulan Maret-Juli 2016 dengan populasi siswa SMK Wikrama Bogor tahun akademik 2015/2016 dengan jumlah sampel sebanyak 100 orang siswa. Pengambilan sampel menggunakan teknik Multistage Random Sampling, dengan kriteria Slovin. Analisis data kuantitatif dilakukan melalui perhitungan statistik deskriptif, uji prasyarat yaitu uji normalitas menggunakan uji Liliefors dan homogenitas menggunakan uji Bartlett serta pengujian hipotesis data menggunakan teknik regresi linier sederhana dan statistik korelasi. Diperoleh nilai koefisien korelasi  (r) = 0,403 dan hasil uji-t pada taraf signifikan a = 0,05 menunjukan thitung = 4,764 dan ttabel = 1,984, sehingga nilai thitung lebih besar dari ttabel. Berdasarkan hasil penelitian tersebut, maka Ho ditolak dan Ha diterima sehingga dapat disimpulkan bahwa terdapat hubungan positif yang kurang erat antara penguasaan konsep pengelolaan sampah dengan perilaku ramah lingkungan siswa di SMK Wikrama Bogor. Hasil penelitian kualitatif diperoleh dua faktor yang menyebabkan kurang eratnya hubungan yaitu faktor dalam diri dan lingkungan luar sekolah. Adapun faktor yang diperkirakan memiliki hubungan erat dengan perilaku ramah lingkungan siswa adalah kebijakan sekolah berupa hukuman dan konsistensi guru

Pengembangan Media Membelajaran Berbasis Android Pada Materi Sintesis Protein Untuk Meningkatkan Kompetensi Siswa

Penelitian ini bertujuan untuk mengembangkan media pembelajaran berbasis Android pada materi sintesis protein untuk meningkatkan kompetensi siswa pada aspek kognitif. Metode yang digunakan adalah penelitian dan pengembangan atau Research and Development dengan desain Four D. Penelitian melibatkan 3 orang validator dan 72 orang siswa. Instrumen yang digunakan dalam penelitian ini yaitu lembar validasi ahli materi, lembar validasi ahli media, lembar validasi guru biologi, dan soal tes pilihan ganda pada materi sintesis protein. Hasil penelitian menunjukkan bahwa validasi media pembelajaran berbasis Android pada materi sintesis protein rata-rata sebesar 93% dengan kategori Sangat Layak. Kompetensi siswa meningkat dengan penggunaan media pembelajaran berbasis Android pada materi sintesis protein, hal ini ditunjukkan dengan hasil uji Mann Whitney. Berdasarkan hasil, penelitian dapat disimpulkan bahwa media pembelajaran berbasis Android pada materi sintesis protein dapat meningkatkan kompetensi siswa. Rekomendasi untuk penelitian lanjutan sebaiknya dilakukan uji coba pada skala luas dengan jumlah siswa yang lebih banyak agar didapatkan data yang lebih akurat

Biotechnology Module Based on Sociosaintific Issues to Improve Student's Critical Thinking Ability Through Online Learning

This research aims to develop a science learning module based on Socio Scientific Issues on biotechnology materials that can improve students' critical thinking skills. This research is an R&D research with a 4-D design. Validation is carried out by science experts and teachers. The module readability test and the students' responses to the module were obtained using a close test and questionnaire. Data analysis was performed descriptively quantitatively. The results of the module validation by expert lecturers obtained 89% and an average CVI value of 0.98 with a very valid category and was suitable for use. The module readability test results were 42.22% with the instructional level category indicating that the modules needed to be learned. The results of the N-Gain test for critical thinking ability is 0.59, the module is in the moderate category and the students' response value to the module by 87.50% showed the response in the very good category to the use of module-based SSI in learning to improve critical thinking skill

The Development of a Virtual Laboratory Based on Problems in the Circulatory System Matter

Practicum in biology learning is an important element that allows students to observe, try, and test scientific concepts directly. However, the problems faced such as limited equipment, costs and time are obstacles. Therefore, the use of a virtual laboratory is needed to overcome this problem. This research aims to develop a problem-based virtual laboratory on circulatory system material. This virtual laboratory not only presents practical simulations that are close to reality but also challenges in the form of problems related to blood circulation that students need to solve. The laboratory was developed with a menu containing competencies, materials, practicums, and evaluations. The research method used was Research and Development (R&D) with the ADDIE model. The instrument was a questionnaire for 20 Biology teachers, expert lecturers, and students. The results showed the validity results of media and material experts of 94% and a VCR value of 0.969 which means valid so that it can be concluded that the development of problem-based virtual laboratories on circulatory system material is suitable for use as a medium in the learning process in High SchoolPraktikum dalam pembelajaran biologi merupakan elemen penting yang memungkinkan siswa untuk mengamati, mencoba, dan menguji konsep-konsep ilmiah secara langsung. Namun, ada beberapa tantangan yang dihadapi oleh praktikum konvensional di laboratorium fisik, seperti keterbatasan peralatan, biaya, dan waktu. Karena itu penggunaan teknologi diperlukan untuk mengatasi permasalahan tersebut, salah satunya dengan laboratorium virtual. Tujuan penelitian ini adalah pengembangan laboratorium virtual berbasis masalah pada materi sistem peredaran darah. Laboratorium virtual ini tidak hanya menyajikan simulasi praktikum yang mendekati realitas, tetapi juga menghadirkan tantangan berupa masalah-masalah terkait peredaran darah yang perlu dipecahkan oleh siswa. Laboratorium dikembangkan dengan menu berisi kompetensi, materi, praktikum dan evaluasi. Metode penelitian yang dilakukan adalah Research and Development (R &D) dengan model ADDIE. Instrumen yang digunakan adalah Angket pada 20 orang guru Biologi, dosen ahli dan siswa. Hasil penelitian menunjukkan bahwa pengembangan laboraotium virtual berbasis masalah pada materi sistem peredaran darah memperoleh hasil valid dan layak digunakan sebagai media dalam proses pembelajaran di Sekolah Menengah Atas