ULASAN: KEBERHASILAN BELAJAR SISWA MELALUI PENERAPAN PEMBELAJARAN KOOPERATIF TIPE STAD

One way learning method could lead students unfocused and  difficult to gain learning outcomes . Currently, the Comparative learning model by Student Team Achievement Division (STAD) it is largely used in teaching. Therefore, this review was made to understand and find out the impact of the learning model system in the class. The study is based on literatures with the following criteria  (1) STAD cooperative type with a quasi-experiment and (2) research subjects were at the senior high school at MIPA class. We obtained 14 articles are similar with the criteria. Each of the article shortly describe the research finding. Indicator of student success with cooperative type STAD can be seen from the average value above 50%. It was found that the STAD type of cooperative learning model lead the creation of  actively students mood, creative, and independent learning atmosphere for students in receiving, processing, and answering learning material. This learning model is likely one of the most adaptive model learning,  modifications some elements are required depend on characteristic  and environment learning locally

The potency of finding a new antimalarial drug from Indonesian sea

Malaria is deadly disease killing 1.5-3 million peoples on the globe a year. In Indonesiaespecially Papua, malaria is a number one killer disease. Finding resources of new drug malariais seriously needed due to resistance to many Chloroquin by Plasmodium. About 65% of marinePorifera from 12 classes in the taxa have recently contributed to our knowledge of biomedicalmaterial. Sponges are abundantely inhabiting Indonesian waters. In recent discovery reportedthat marine sponge Xestospongiafrom Papua has possessed a great ability against Plasmodiumfalciparum.These evidence thus stated Indonesian water is home of the potential marine drug formalaria. For sustainable reason, production live specimen throughout sea culture should to behighlighted. This review presents a development of malaria disease and the potential of Indonesianmarine biota as biomedical material especially for malaria disease

Uji Aktivitas Antimalaria dari Spons Xestospongia sp. Asal Pulau Yapen secara In Vivo

It is generally admitted that marine sponge has rich of secondary metabolite as alkaloids, peptides and terpene. Those various compounds can be used for antimalarial drug.  This study aims to evaluate the in vivo antimalarial activity and to characterize the effectiveness of dose (ED50) of n-hexane extracted from Xestospongia sp. by using the Plasmodium berghei infected to mices. In the present study, we used Peter’s four day suppressive test, where the mice infected with Plasmodium berghei intra peritoneal with a suspension containing infected red blood cell origin from donor mice with parasitemia. Results of present study exhibited that the sponge Xestospongia sp. contains secondary metabolite including tritepenoid/steroid, alkaloid and saponin. Furthermore, an in vivo test revealed the affectivity dose (ED50) was 0.24 mg/kg of body weight. This finding is categorized a signifant decreasing level of parasitemia.   Secara umum, spons laut mempunyai kandungan metabolit sekunder seperti alkaloid, peptide dan terpena. Berbagai senyawa tersebut dapat dimanfaatkan sebagai obat antimalaria. Penelitian ini bertujuan untuk mengetahui kandungan kimia dan mengevaluasi aktivitas antimalarial secara in vivo untuk efektivitas dosis (ED50) ekstrak n-heksana dari spons Xestospongia sp. dengan menggunakan Plasmodium berghei yang diinfeksi ke tikus. Penelitian ini digunakan metode the 4-day Supresive Test, dimana mencit yang diinfeksi Plasmodium berghei secara intra peritoneal dengan suspensi yang mengandung sel darah merah terinfeksi yang berasal dari mencit donor. Hasil penelitian ini menunjukkan adanya kandungan metabolit sekunder diantaranya tritepenoid/steroid, alkaloid dan saponin. Selanjutnya, uji in vivo diperoleh nilai ED50 sebesar 0,24 mg/kg BB dikelompokan sangat baik, yang dapat menurunkan tingkat parasitemia secara signifikan. Dengan demikian, spons laut asal pulau Yapen dapat dijadikan sebagai sumber metabolit potensial untuk obat antimalaria

PENERAPAN MODEL PEMBELAJARAN PREDICT OBSERVE EXPLAIN (POE) UNTUK MENINGKATKAN PEMAHAMAN KONSEP DAN KEMAMPUAN BERFIKIR KRITIS DASAR SISWA

Model pembelajaran diperlukan agar peserta didik terlibat aktif dalam mengeksplorasi dan menerapkan konsep materi dengan baik. Salah satunya yaitu model POE (Predict-Observe-Explain). POE merupakan salah satu strategi pembelajaran yang dapat digunakan pada proses belajar  kimia seperti  memahami konsep-konsep serta penerapannya dalam kehidupan. Penelitian ini merupakan studi literatur dengan mengangkat tema terkait model pembelajaran POE. Tujuan dari penelitian ini adalah untuk mengetahui adanya dampak  penerapan model POE guna peningkatan pemahaman konsep serta  kemampuan berfikir kritis pada siswa. Semua artikel yang memiliki tema yang relevan kemudian dikumpulkan, lalu dipilah sesuai kriteria yang ditetapkan. Artikel-artikel yang terpilih disebut sebagai data pada penelitian ini. Berdasarkan hasil analisa tersebut menunjukkan bahwa penggunaan model pembelajaran POE  dapat membantu siswa untuk meningkatkan pemahaman konsep dan berfikir kritis dalam pembelajaran kimia dan dapat meningkatkan prestasi siswa

MOTIVASI BELAJAR KIMIA TERHADAP KEMAMPUAN KOGNITIF PESERTA DIDIK PADA MATERI SISTEM KOLOID

Education can be created through an active learning atmosphere in developing the self-potential of students to have religious spiritual strength, self-control, personality, intelligence, noble character, and skills needed by themselves, society, nation and state. This study aims to determine the influence and relationship between motivation to learn chemistry on cognitive learning outcomes of students at SMA Negeri 1 Manokwari on colloidal system material. The research method used is a quantitative experiment with an associative approach. This research design used pre-experimental design in the form of One-Shot Case Study. The sampling technique in this study used the Non Probability Sampling Technique, with Purposive Sampling. The samples used were students. Data collection instruments included a questionnaire on motivation to learn chemistry and tests of cognitive learning outcomes. The results showed that there was a significant influence between the motivation to learn chemistry on students' cognitive learning outcomes, which was indicated by the significance value obtained from the simple linear regression test and the correlation test, namely 0.0001 and the R Square value of 33%. and there is a positive relationship between motivation to learn chemistry on cognitive learning outcomes of students

Developing Problem-Based Learning Modules on Petroleum Materials in Chemistry Learning

The aim of this study is to investigate how to develop, validity, and practicality levels from the PBL-based module. The research is based on Research & Development (R&D) with a modified 4-D development model to 3-D covering define, design, and development stages. Data collection tools include observation, validation, worksheet, and questionnaires of students’ responses to the chemistry modules. Based on the study results, it was identified that the modules developed to determine criteria eligibility, practicality, and response students of Problem-Based Learning on petroleum material. The material and media experts' validation tests showed 0.851 and 0.726 (valid), respectively. The average practically percentage of modules for students is 77.52% with very practical criteria. The development of PBL-based chemistry modules on chemistry and the application of petroleum is expected to help students in learning chemistry

DAMPAK MINAT TERHADAP HASIL BELAJAR KOGNITIF SISWA PADA MATERI HIDROLISIS GARAM DI MADRASAH ALIYAH (MA) NEGERI MANOKWARI SELAMA PANDEMI COVID-19

Kegiatan pembelajaran memerlukan metode yang tepat terutama dimasa pandemi COVID-19 yang mengadakan pembelajaran online. Pembelajaran online membutuhkan motivasi dan pemahaman konsep yang lebih agar minat belajar siswa meningkat sehingga dapat mengikuti proses pembelajaran dengan baik. Penelitian ini bertujuan untuk: (1) Untuk mengetahui  dampak minat terhadap hasil belajar kognitif siswa  dan (2) persen  pengaruh dampak minat terhadap hasil belajar kognitif siswa belajar siswa pada materi hidrolisis garam kelas XI IPA MA Negeri Manokwari selama pandemi COVID-19. Penelitian ini menggunakan metode kuantitatif dengan pendekatan deskriptif . Populasi yang digunakan siswa kelas XI IPA 1 dan IPA 2 MA Negeri Manokwari Semester Genap Tahun ajaran 2021/2022 terdiri sebanyak 35 orang siswa. Teknik pengambilan sampel menggunakan sampling jenuh. Teknik pengumpulan data dilakukan dengan teknik wawancara, observasi, dokumentasi, dan angket minat belajar. Berdasarkan hasil penelitian menunjukkan adanya dampak negatif dan positif pada minat terhadap hasil belajar siswa yang diperoleh dari persentase respon siswa, dan adanya pengaruh yang signifikan sebesar 0,003. Berdasarkan analisis R Square menunjukkan adanya pengaruh minat belajar sebesar 23%

A New Antiplasmodial Compound from the Papuan Marine Sponge Xestospongia sp.

A new antiplasmodial compound, 2-(3H-diazirine-3-yl)benzaldehyde (1), has been isolated from the Papuan marine sponge Xestospongia sp. The structure elucidation of compound 1 was determined by spectroscopic evidences including UV, IR, MS, 1D and 2D-NMR analysis. Compound 1 showed moderate antiplasmodial activity against Plasmodium falciparum with IC50 value of 1.08 x 10-6 mM. DOI:http://dx.doi.org/10.15408/jkv.v4i1.673

Unsur Kelumit Esensial (Mn Dan Zn) dalam Biji Kakao (Theobroma Cacao L.) dari Daerah Perkebunan Ransiki Papua Barat

Cocoa is a rich source of essential minerals and contributes a significant amount of minerals in the human diet. Processed products from cocoa in the form of chocolate are in great demand by almost everyone from various statuses and social groups. The high consumption of chocolate is also not a fact that chocolate is beneficial to human health. The essential minerals (Mn and Zn) in cocoa beans are needed by the human body as a source of minerals, but if excess can be harmful to the body. The purpose of this study was to determine the content of essential trace elements in cocoa beans and their potential as raw materials for food products. The analysis method uses AAS (Atomic Absorption Spectrophotometry). The results showed the content of micronutrients (Mn and Zn) in cocoa beans at five location points with an average value of 0.8976 mg/100 g and 5.7534 mg/100 g