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All Journal KUKILA Indonesian Journal of Chemistry Fullerene Journal of Chemistry Oxygenius Journal Of Chemistry Education

Wilson Alexander Raymond Rombang

Universitas Negeri Manado

Author-ID : 363620

Chemical Engineering, Chemistry & Bioengineering Chemistry Education Other

Published : 11 Documents Claim Missing Document

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Articles

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First Photographic Evidence and a Breeding Record of a Frogmouth on Siberut, Mentawai Islands, West Sumatra Rombang, William Marthy
KUKILA Vol 14 (2009)
Publisher : KUKILA

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First Nesting Observations of Wild Bronze-tailed Peacock Pheasant Polyplectron chalcurum, a Sumatran Endemic Species Rombang, William M; Malau, Lismaidy Darjo; Wagiman, .
KUKILA Vol 14 (2009)
Publisher : KUKILA

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First Photographic Evidence and a Breeding Record of a Frogmouth on Siberut, Mentawai Islands, West Sumatra William Marthy Rombang
KUKILA Vol. 14 (2009)
Publisher : Indonesian Ornithologists’ Union

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First Nesting Observations of Wild Bronze-tailed Peacock Pheasant Polyplectron chalcurum, a Sumatran Endemic Species William M Rombang; Lismaidy Darjo Malau; . Wagiman
KUKILA Vol. 14 (2009)
Publisher : Indonesian Ornithologists’ Union

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Potensi antitumor dari beberapa spons laut asal teluk Manado Wilson Alexander Raymond Rombang
Jurnal Kimia Fullerene Vol 2 No 2 (2017): Fullerene Journal of Chemistry
Publisher : Fakultas Matematika dan Ilmu Pengetahuan Alam

Screening of antitumor for the extract and fraction from the marine sponges ofManado Gulf, Aaptos sp., Acervochalina sp., Gelliodes sp., Theonella sp., and orangeboring sponge have been done by use P388 murine leukemia cell. Activity test resultshowed IC50 of the extract and fraction from Aaptos sp were: MeOH extract 5938ng/mL and BuOH extract 125000 ng/mL; Acervochalina sp: EtOH extract 125000ng/mL, PE extract 125000 ng/mL, EtOAc extract 4251 ng/mL, BuOH extract125000 ng/mL; Gelliodes sp: EtOH extract 125000 ng/mL; Theonella sp: EtOHextract 125000 ng/mL, PE extract 9282 ng/mL, EtOAc extract 3273 ng/mL, BuOHextract 125000 ng/mL; orange boring sponge: MeOH extract 1422 ng/mL. Based onthe IC50 value, it could be concluded that MeOH extract of Aaptos sp., EtOAc extractof boring sponge could be a sources for cytotoxic compounds.

ISOLATION AND STRUCTURE DETERMINATION OF BISDEMTHYLAAPTAMINE FROM BUNAKEN MARINE PARK SPONGE Aaptos, sp. Wilson AR Rombang; Rymond J Rumampuk; Ponis Tarigan; Anthony J Herlt; Lewis N Mander
Indonesian Journal of Chemistry Vol 3, No 3 (2003)
Publisher : Universitas Gadjah Mada

Bisdemethylaaptamine, an alkaloid naphtyridine with molecular weight 200 and formulae molecule C11H8N2O2 has been isolated from Bunaken Marine Park sponge Aaptos sp. Isolation was done by using several stages of column chromatography and high performance liquid chromatography. Molecular weight of this naphtyridine alkaloid was determined by electron ionization (EI) and electrospray ionization (ESI) mass spectroscopies and its structure assigned to be 8,9-dihydroxy-1H-benzo[d,e][1,6]naphtyridine by proton and carbon nuclear magnetic resonances (1H and 13C-NMR).

Aplikasi RGB-Colormeter Pada Praktikum Spektrofotometri Aldio Prima Verguson David; Wilson A R Rombang; Meiske Mamuaja
Oxygenius Journal Of Chemistry Education Vol 3 No 2 (2021): Oxygenius: Journal of Chemistry Education
Publisher : Chemistry Department, Universitas Negeri Manado

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37033/ojce.v3i2.281

The purpose of this study was to determine the application of the RGB-Colormeter application in smartphone-based practicum in online learning. This research was conducted in February-March in the third semester of chemistry education, FMIPA UNIMA. This research was conducted at the Department of Chemistry, FMIPA UNIMA in the 2020/2021 academic year. The research method used is descriptive qualitative. Twenty-two third semester students were selected to be selected as research samples. The data was collected by using a test in the form of essay questions as many as 12 questions about spectrophotometry material. The data collection technique uses practical results. The results of the practicum obtained show that the use of practicum using the RGB-Colormeter application can be used as an alternative method in learning the concept of spectrophotometry during a pandemic and has an effect on students' understanding that is awakened. Based on these results, it can be stated that the practicum method with the RGB-Colormeter application is suitable for use, especially during the pandemic.

Hubungan Penggunaan Model Pembelajaran Langsung Dengan Sikap Siswa Dan Prestasi Belajar Siswa Pada Materi Larutan Elektrolit Dan Nonelektrolit Karmila Bella; Wilson Rombang; Meiske Mamuaja
Oxygenius Journal Of Chemistry Education Vol 1 No 2 (2019): Oxygenius : Journal of Chemistry Education
Publisher : Chemistry Department, Universitas Negeri Manado

Telah dilakukan penelitian model pembelajaran langsung pada siswa SMA Negeri 2 Tondano di semester genap tahun ajaran 2018/2019 bulan Januari-Februari 2019. Penelitian ini bertujuan untuk mengetahui hubungan model pembelajaran langsung dengan sikap siswa dan peningkatan prestasi belajar siswa pada materi larutan elektrolit dan nonelektrolit. Penelitian ini menggunakan metode eksperimen dengan desain penelitian one group pretest-posttest design. Populasi dalam penelitian ini adalah siswa kelas X IPA SMA Negeri 2 Tondano. Pengujian validitas instrumen soal diperoleh 10 soal yang valid dan 2 soal tidak valid, sedangkan pengujian reliabilitas instrumen soal diperoleh koefisien reliabilitas 0,785. Pengujian distribusi sikap positif siswa sebelum dan sesudah perlakuan diperoleh hasil bahwa sikap positif siswa tentang pembelajaran kimia meningkat. Berdasarkan hasil presentase selisih diatas menunjukkan bahwa sikap siswa dan prestasi belajar siswa mengalami kenaikan atau peningkatan.Hasil uji normalitas menunjukkan Lhitung<Ltabel untuk kelas eksperimen (0,10< 0,17) sehingga data berdistribusi normal. Maka dapat dilakukan uji hipotesis menggunakan uji korelasi Pearson Product Moment diperoleh nilai rxy = 0,602, selanjutnya uji signifikan nilai korelasi r kedalam nilai t dengan kriteria pengujian thitung > ttabel. Dari hasil perhitungan bahwa thitung (3.62) ttabel (2,06). Penelitian ini menyimpulkan bahwa terdapat hubungan antara model pembelajaran langsung dengan sikap siswa dan prestasi belajar siswa pada materi larutan elektrolit dan nonelektrolit.

Pengaruh Penggunaan Metode Case Based Instruction (CBI) terhadap Pemahaman Siswa Kelas X pada Materi Hukum-Hukum Gas di SMA Negeri 1 Tompaso Astrid Magritha Singal; Wilson Rombang; Djefry Tani
Oxygenius Journal Of Chemistry Education Vol 1 No 2 (2019): Oxygenius : Journal of Chemistry Education
Publisher : Chemistry Department, Universitas Negeri Manado

Penelitian ini bertujuan meningkatkan pemahaman siswa yang diajarkan menggunakan metode pembelajaran CBI lebih tinggi dari pemahaman siswa yang diajarkan menggunakan metode pembelajaran konvensional. Penelitian ini dilaksanakan di SMA Negeri 1 Tompaso, sampel penelitian ini adalah kelas X MIA 2 sebagai kelas eksperimen dan X MIA 1 sebagai kelas kontrol. Dapat dilihat dari hasil uji F (One Way ANOVA) menunjukkan bahwa Fhitung > Ftabel yaitu 11.07599 > 4.04 dan nilai probabilitas P value < 0,05 yaitu 0.001685 < 0,05 dan hasil uji t diperoleh hasil = 3,32812 = 1,677. Jadi, Thitung > Ttabel , maka tolak Ho dan terima H1 sehingga . Berdasarkan analisis data hasil penelitian dapat disimpulkan bahwa pemahaman siswa yang diajarkan dengan menggunakan metode pembelajaran Case Based Instruction lebih tinggi dari pada pemahaman siswa yang diajarkan menggunakan metode pembelajaran konvensional.

Pengaruh Metode Pembelajaran Inquiry Berbasis Visualisasi Materi Larutan Elektrolit dan Nonelektrolit di Kelas X IPA SMA Negeri 1 Kawangkoan Reynaldi Assa; Wilson Alexander Rombang; Hardin Foster Rares
Oxygenius Journal Of Chemistry Education Vol 1 No 2 (2019): Oxygenius : Journal of Chemistry Education
Publisher : Chemistry Department, Universitas Negeri Manado

The purpose of this study is to examine the effect of visualization-based inquiry learning methods on student learning outcomes in electrolyte and non-electrolyte solution material. This research was conducted in Kawangkoan 1 Public High School, in the even semester X IPA students, 2018/2019 academic year. Class X IPA students 1 (n = 31) as the experimental class and class X IPA 2 (n = 32) as the control class. The test used in this study statistical t test with significance level α = 0.05 with the testing criteriat> ttable then H0 is rejected and H1 accepted. The results obtained in this test obtained tcount 5.25> ttable 1.670. This test is done not to improve student learning outcomes beyond the minimum standard of completeness criteria in school but this testing is only to see the effect of visualization based inquiry learning methods on student learning outcomes. Based on the results obtained it can be concluded that there are differences in student learning outcomes applied with conventional learning models (control class) and visualization based inquiry learning methods (experimental class)

Co-Authors . Wagiman Aldio Prima Verguson David Anthony J Herlt Astrid Magritha Singal Djefry Tani Hardin Foster Rares Karmila Bella Lewis N Mander Lismaidy Darjo Malau Meiske Naomi Mamuaja Natalia Dalipang Ponis Tarigan Reynaldi Assa Rymond Jusuf Rumampuk

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