Jurnal FKIP Universitas Mataram (Fakultas Keguruan Dan Ilmu Pendidikan)
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Penerapan Model Problem Based Learning pada Materi Transformasi Geometri untuk Meningkatkan Hasil Belajar Siswa
Full text linkThis research aims to improve student learning outcomes through the application of problem-based learning models on geometric transformation materials (rotation and dilation). This type of research is a class-action-research (PTK) that looks at student development in 2 cycles. Data collection techniques were carried out using formative tests. Data analysis used in this study using descriptive statistical analysis. The application of PBL learning model on geometry transformation material (rotation and dilation) gives good results. The data obtained from the research conducted are as follows: (1) In cycle 1 the percentage of students' classical completeness reached 62% with an average score of 79.45. The results in cycle 1 have not met the minimum classical completeness criteria of 80%. (2) In cycle 2, there was an increase both in terms of the percentage of classical completeness and the average score. The number of students who completed this cycle was 82% with an average score of 84.08. This indicates that the research by applying PBL model on geometry transformation material is successful.Penelitian ini bertujuan untuk meningkatkan hasil belajar siswa melalui penerapan model pembelajaran berbasis masalah pada materi transformasi geometrri (rotasi dan dilatasi). Jenis penelitian ini adalah penelitian tindakan kelas (PTK) yang melihat perkembangan siswa dalam 2 siklus. Teknik pengumpulan data dilakukan dengan menggunakan tes formatif. Analisis data yang digunakan dalam penelitian ini menggunakan analisis statistik deskriptif. Penerapan model pembelajaran PBL pada materi transformasi geometri (rotasi dan dilatasi) memberikan hasil yang baik. Data yang diperoleh dari penelitian yang dilakukan yaitu sebagai berikut: (1) Pada siklus 1 persentase ketuntasan klasikal siswa mencapai 62% dengan nilai rata-rata 79,45. Hasil pada siklus 1 ini belum memenuhi kriteria ketuntasan klasikal minimum yaitu 80%. (2) Pada siklus 2 terjadi peningkatan baik dari segi persentase ketuntasan klasikal dan nilai rata-rata. Jumlah siswa yang tuntas pada siklus ini sebanyak 82% dengan nilai rata-rata mencapai 84,08. Hal ini mengindikasikan bahwa penelitian dengan menerapkan model PBL pada materi transformasi geometri dianggap berhasil
Analisis Efektivitas Pemanfaatan Laboratorium Kimia di Sekolah Menengah Atas Negeri di Kabupaten Lombok Timur
Full text linkThis study aims to determine the effectiveness of using chemical laboratory functions and tools in Public Senior High Schools throughout East Lombok Regency. The approach in this study uses a descriptive quantitative approach. The population of this study consisted of all high schools in East Lombok Regency. The sample for this study comprised six schools: SMAN 2 Selong, SMAN 3 Selong, SMAN 1 Terara, SMAN 1 Pringgabaya, SMAN 1 Sembalun, and SMAN 1 Labuhan Haji, which were selected using purposive sampling. Data collection used questionnaires and interviews; the questionnaire used was closed with a Likert scale. For the interpretation of problem data using the criteria of 5 categories (not effective, less effective, moderately effective, effective, very effective) which are determined by simple percentages and tables. Based on data analysis it is known that; 1) the effectiveness of the use of chemical laboratory functions in State Senior High Schools throughout East Lombok Regency has been effective (74.82%). 2) The effectiveness of the use of chemical laboratory equipment in State Senior High Schools throughout the East Lombok Regency has been effective (80.33%).Penelitian ini bertujuan untuk mengetahui efektivitas pemanfaatan fungsi dan alat laboratorium kimia di Sekolah Menengah Atas Negeri se-Kabupaten Lombok Timur. Pendekatan dalam penelitian ini menggunakan pendekatan kuantitatif deskriptif. Populasi penelitian ini adalah seluruh SMA se-Kabupaten Lombok Timur, kemudian sampel penelitian ini sebanyak enam sekolah yaitu SMAN 2 Selong, SMAN 3 Selong, SMAN 1 Terara, SMAN 1 Pringgabaya, SMAN 1 Sembalun dan SMAN 1 Labuhan Haji yang diambil secara purposive sampling. Pengumpulan data menggunakan angket dan wawancara, angket yang digunakan adalah tertutup dengan skala likert. Untuk penafsiran data masalah menggunakan kriteria sebanyak 5 kategori (tidak efektif, kurang efektif, cukup efektif, efektif, sangat efektif) yang ditentukan dengan presentase sederhana dan tabel. Berdasarkan analisis data diketahui bahwa; 1) efektivitas pemanfaatan fungsi laboratorium kimia di Sekolah Menengah Atas Negeri se-Kabupaten Lombok Timur sudah efektif (74,82%). 2) Efektivitas pemanfaatan peralatan laboratorium kimia di Sekolah Menengah Atas Negeri se-Kabupaten Lombok Timur sudah efektif (80,33%)
Pengembangan Lembar Kerja Peserta Didik (LKPD) Berbasis Model Discovery Learning Pada Materi Laju Reaksi
Full text linkThis study aims to develop a student worksheet based on the Discovery Learning model for the reaction rate topic and to determine its feasibility in terms of validity through expert validation. The development model used is the 4D model, which consists of four stages: define, design, develop, and disseminate. However, this research is limited to the development stage, focusing on the feasibility testing of the student worksheet. The trial was conducted with 40 students at SMAN 2 Mataram. The research instruments included interview sheets and validation sheets for student worksheets. The data collected comprised both quantitative data, in the form of scores from expert validators using the validation sheets, and qualitative data, in the form of suggestions and feedback from validators. The validation sheets used a Likert scale. The validation results showed a score of 89.63% for the content/material aspect, 95.56% for presentation, 90.00% for language, and 91.63% for graphic feasibility. The overall average score for all aspects of the LKPD was 91.63%, with a reliability score of 94.00%, indicating that the student worksheet is highly feasible and suitable for use in the learning process.Penelitian ini bertujuan untuk mengembangkan lembar kerja peserta didik (LKPD) berbasis model Discovery Learning pada materi laju reaksi serta mengetahui kelayakan lembar kerja peserta didik (LKPD) yang ditinjau dari validitas melalui hasil validasi para ahli. Model pengembangan yang digunakan yaitu model 4D terdiri dari 4 tahap yaitu tahap pendefinisian (define), perancangan (design), pengembangan (develop) dan penyebaran (disseminate) yang dibatasi pada tahap pengembangan berupa pada tahap uji kelayakan LKPD. Uji coba LKPD dilakukan kepada 40 peserta didik di SMAN 2 Mataram. Instrumen penelitian berupa lembar wawancara dan lembar validasi LKPD. Data yang dihasilkan terdiri dari data kuantitatif yaitu berupa skor yang diberikan pada lembar validasi oleh validator ahli dan data kualitatif berupa saran maupun masukan dari validator. Lembar validasi menggunakkan skala likert. Hasil validasi LKPD meliputi persentase penilaian pada aspek isi/materi sebesar 89,63%, aspek penyajian sebesar 95,56%, aspek kebahasaan sebesar 90,00% dan kelayakan kegrafisan sebesar 91,63% sehingga persentase rata-rata seluruh komponen aspek LKPD yaitu sebesar 91,63% dan persentase rata-rata reliabilitas LKPD sebesar 94,00% sehingga dikategorikan sangat layak dan dapat digunakan dalam proses pembelajaran
Analisis Kesulitan Belajar Siswa dalam Memahami Konsep Kimia Laju Reaksi Kelas XI IPA SMA Negeri 1 Labuapi
Full text linkThis study aims to describe the learning difficulties of students that need to be overcome in understanding the concept of reaction rate chemistry in class XI science SMA Negeri 1 Labuapi. The approach used is a qualitative descriptive approach. The subjects of this study are all students of class XI science of SMA Negeri 1 Labuapi, with samples selected using the nonprobability sampling method of saturation sampling. Data collection was carried out through a closed questionnaire on a likert scale of 5 and interviews. Data interpretation refers to five categories of learning difficulties, namely very high, high, moderately high, low, and very low, which are determined based on simple percentages and tables. The results of the data analysis showed that: 1) Students who experienced difficulties with internal factors included aspects of student ability 38.7%, student interest 37.5%, understanding of reaction rate material concepts 30%, student motivation 27.5%, included in the low category while external factors with aspects of approach/learning model 35%, teaching resources 23% were in the low category, and teachers 17%, class conditions 15% were in the very low category 2) Students' learning difficulties in understanding the concept of reaction rate chemistry that need to be considered are internal factors of student ability indicators (38.75%) and external factors in learning approaches/model indicators (35%).
Penelitian ini bertujuan untuk mendeskripsikan kesulitan belajar siswa yang perlu diatasi dalam memahami konsep kimia laju reaksi kelas XI IPA SMA Negeri 1 Labuapi. Pendekatan yang digunakan adalah pendekatan deskriptif kualitatif. Subjek penelitian ini adalah semua siswa kelas XI IPA SMA Negeri 1 Labuapi, dengan sampel yang dipilih menggunakan metode nonprobability sampling jenis saturation sampling. Pengumpulan data dilakukan melalui angket/kuisioner tertutup skala likert 5 dan wawancara. Interpretasi data mengacu pada lima kategori kesulitan belajar, yaitu sangat tinggi, tinggi, cukup tinggi, rendah, dan sangat rendah, yang ditentukan berdasarkan persentase sederhana dan tabel. Hasil analisis data menunjukkan bahwa: 1) Siswa yang mengalami kesulitan pada faktor internal meliputi aspek kemampuan siswa 38,7%, minat siswa 37,5%, pemahaman konsep materi laju reaksi 30%, motivasi siswa 27,5%, masuk dalam kategori rendah sedangkan faktor eksternal dengan aspek pendekatan/model pembelajaran 35%, sumber ajar 23% masuk kategori rendah, dan guru 17%, keadaan kelas 15% masuk dalam kategori sangat rendah 2) Kesulitan belajar siswa dalam memahami konsep kimia laju reaksi yang perlu diperhatikan yakni pada faktor internal indikator kemampuan siswa (38,75%) dan faktor eksternal pada indikator pendekatan/model pembelajaran (35%).
 
Effect of Acid Catalyst on Epoxydation Reaction of Nyamplung Seed Oil
Full text linkEpoxy is a cyclic ether compound that contains an oxirane group and has been widely applied as a stabilizer, plasticizer in polyvinyl chloride (PVC), surfactant, pesticide raw material, and as a polymer resin coating. The raw materials in epoxy synthesis come from petroleum derivatives, which are non-renewable natural resources. Therefore, there is a need for alternative raw materials that can be renewed, such as vegetable oil. In this study, nyamplung seed oil was used. Epoxy synthesis is usually carried out using carboxylic acid epoxidation with the help of an acid catalyst. This research aims to determine the effect of the type of acid catalyst and its concentration on the epoxidation reaction of nyamplung seed oil and the characterization of the epoxy produced. The research results show that using an acid catalyst can increase the formation of oxirane groups at a certain concentration, where the highest oxirane number value was obtained when using the H2SO4 catalyst, namely 3.15%. The resulting epoxy is pale yellow, has a typical absorption area (COC) at a wave number of 825 cm-1, an iodine value of 13.96 g iod/100 g, a viscosity of 20.80 cP, and a relative per cent conversion to oxirane of 73.4
The Effect of Different Solvents and Methods on Brown Seaweed Turbinaria sp. Metabolite Profil
Full text linkTurbinaria sp. is valuable source of various metabolites that exhibit pharmacological and biological activities. The diversity of these metabolites can be influenced by several factors, such as environmental conditions and the choice of solvent during the extraction process. This study aims to investigate the effect of different solvents and methods on the metabolite profiles of Turbinaria sp. extract Turbinaria sp. was extracted using maceration and soxhlet method with n-hexane and n-hexane:methanol as solvents. Phytochemical analysis was performed using tube tests. Meanwhile the determination of total phenols and total flavonoids was performed by spectrophotometry assay. The results has shown that Turbinaria sp. contain flavonoids, alkaloids, terpenoids, phenols, and tannins, with the highest total phenol and total flavonoid content found in the extracts using n-hexane as a solvent and soxhletation methods
Analysis the Abundance and Composition of Microplastics in Skipjack Fish (Katsuwonus pelamis) at Muara Angke Fish Auction
Full text linkMarine pollution due to plastic waste has become a global problem that has yet to be solved. In the ocean, floating plastics degrade into small particles (<5 mm) known as microplastics. Its small size has the risk of being eaten by marine organisms. One of the marine products that have high economic value is skipjack. This study aims to determine the content, abundance, and influence of the amount of microplastics with the weight of the digestive tract of skipjack (Katsuwonus pelamis) at Muara Angke auction fish. The deconstruction process in this study used 10% KOH as much as 3x the volume of tissue and 30% H2O2 as much as 5 ml. The results showed that fiber- type microplastics dominated with a percentage of 66%, fragments 20%, and films 14%. There are 6 kinds of colors found, namely transparent, black, red, blue, yellow, and orange. Transparent color dominates with a percentage of 74%. The total microplastic particles found in the skipjack digestive tract were 2336 particles with an abundance value of 259.55 particles/individual. The number of microplastics found had no correlation with the weight of the fish digestive tract with P (sig) 0.509 > 0.05 (α). All skipjack samples identified were contaminated with microplastics. Fiber and transparent color microplastic types dominated. The amount of microplastics had no influence on the weight of the fish digestive tract
Potential Use of Invigoration Techniques to Improve Viability and Vigor of Soybean Seeds
Full text linkDemand for soybeans in Indonesia continues to increase along with population growth, but productivity remains low and dependent on imports. One of the key factors affecting soybean productivity is seed quality, which often deteriorates during storage. Seed invigoration, which includes techniques such as hydration-dehydration, hydropriming, and osmopriming, is a possible solution to improve soybean seed viability and vigor. This research used the literature survey method to collect and analyze data from various scientific sources. The results show that seed invigoration can improve the quality of soybean seeds by improving the germination process, increasing vigor, and optimizing water uptake. These techniques are especially important when seeds are sown in non-ideal conditions, such as arid or high salinity areas. Thus, the application of invigoration techniques has the potential to be an effective strategy for increasing soybean productivity in Indonesia and reducing import dependence
Potential of Octopus Ink Extract as Anti-Quorum Sensing to Prevent Aeromonas hydrophila Biofilm in Aquaculture
Full text linkAeromonas hydrophila is a pathogenic bacterium that often causes disease in freshwater fish, thus impacting food insecurity and global economic losses. Biofilm formation by A. hydrophila regulated by the quorum sensing (QS) system plays an important role in increasing virulence and resistance to antibiotics. Inhibiting the QS system can be an option to control A. hydrophila infection in fish. One of the ingredients that can be used is octopus ink extract containing alkaloids. This study aims to analyze the potential of octopus ink extract as an anti-quorum sensing agent in preventing the formation of A. hydrophila biofilms in aquaculture. The method used is a systematic literature study by collecting data from scientific articles. The analysis was carried out in depth to evaluate the mechanism of octopus ink extract in inhibiting QS and bacterial biofilms. The results showed that active compounds in octopus ink, such as alkaloids, can inhibit communication between bacterial cells by blocking QS autoinducers. This process suppresses the expression of virulence genes and prevents biofilm formation without affecting bacterial viability, so the risk of antibiotic resistance can be minimized. In conclusion, octopus ink extract has great potential as an anti-quorum sensing agent to support the management of A. hydrophila infection in aquaculture. The use of this extract is not only effective but also environmentally friendly, offering an innovative solution to improve the health of farmed fish and the sustainability of the aquaculture industry. Furthermore, octopus ink extract can be used as an immunostimulant in aquaculture industry
Effects of Biological Fertilizer and NPK on Red Chili Growth in Automated Drip Irrigation Systems
Full text linkRed chili (Capsicum annuum L.) is crucial for household consumption and the food industry, but its productivity declines due to soil fertility depletion caused by excessive chemical fertilizer use. This study aims to evaluate the effects of combining biological fertilizer and NPK on the growth and yield of red chili plants. A factorial completely randomized design (CRD) experiment with 12 treatment combinations was conducted at the UG Technopark Greenhouse, Cianjur, West Java, from May to August 2023. The first factor was the frequency of biological fertilizer application (none, biweekly, weekly, and twice a week), while the second factor was the NPK fertilizer dosage (none, 50%, and 100% of the recommended dose). The results showed that both fertilizers significantly influenced plant growth and yield, with the optimal treatment being the application of biological fertilizer twice a week combined with 100% of the recommended NPK dosage. A significant interaction between NPK dosage and biological fertilizer frequency was observed, affecting plant performance. These findings highlight the importance of integrating biological fertilizers with NPK to enhance red chili productivity while reducing reliance on chemical inputs, contributing to more sustainable agricultural practices