Judul: Pengaruh Penggunaan Zeolit Bayah sebagai Matriks Imobilisasi pada Aktivitas Antioksidan Superoksida Dismutase Deinococcus radiodurans
Abstrak: Immobilization of superoxide dismutase (SOD) from extract of D. radiodurans has been studied over past years. D. radiodurans is a bacteria that produces enzyme Mn-SOD. The optimum condition of SOD antioxidant activity of D. Radiodurans extract is at 30 °C, pH 9, 137.5 mg of zeolite Bayah and 1500 g/L extract of D. radiodurans concentrate. The determination of kinetics reaction is based on the method of Lineweaver-Burk and Eadie-Hoofstee, which resulted KM app SOD value of immobilized extract D. radiodurans on zeolite is higher than without immobilized extract D. radiodurans. Furthermore, the value of IM app of immobilized extract D. radiodurans is really massive, 7.0373 μA. The electrode stability of immobilized extract D. radiodurans still 57.70% after 8 hours, compared to without immobilized extract D. radiodurans that dropped to 45.04% after 2 hours.
Keyword: zeolite, superoxide dismutase, Deinococcus radiodurans, antioxidant

Judul: Biosensor antioksidan berbasis superoksida dismutase deinoccus radiodurans diimobilisasi pada nanokomposit zeolit alam indonesia
Abstrak: The immobilization superoxide dismutase extract from D. radioduras on a zeolite nanocomposite modified electrode were studied. Cyclic voltammetry (CV) are employed to investigate the catalytic behavior of the biosensor. The superoxide radical was produced in solution using the xantine/xanthine oksidase system. Antioxidant activity vitamin C was determined by 2, 2-diphenil-2-picrylhydrazyl (DPPH) free radical scavenging method and comparing with biosensor SOD. Optimum conditions for SOD activity was at pH 9, temperature 300 C, zeolite 137.5mg, and SOD 3 U/ml for pure SOD and 9, temperature 300 C, zeolite 137.5mg, and SOD 1500μg/mL for D. radiodurans SOD. Dismutation reaction kinetics of superoxide catalyzed by SOD followed the Lineweaver-Burk kinetics with D. radiodurans SOD Kmapp value was higher than pure SOD. Antioxidant capacity for Vitamin C was 19.49 ppm using DPPH method and value 0,7 for relative antioxidant capacity using biosensor SOD. In conclusion, D radiodurans SOD immobilized on a zeolite nanocomposite had a great potential as biological recognition component for antioxidant biosensor.
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Judul: Pemodelan chord pada piano menggunakan metode fuzzy learning vector quantization
Abstrak: Seorang pemain piano pemula maupun autodidak umumnya belum melalui tahap latihan yang baik sehingga kemampuan untuk mengenali chord yang dimiliki masih kurang. Oleh karena itu, suatu sistem yang dapat mengenali chord untuk membantu proses pemahaman chord yang dimainkan dibutuhkan. Penelitian ini memodelkan chord yang terdiri atas 3 nada (triad) ke dalam beberapa kelas. Data yang digunakan dalam penelitian ini adalah 24 chord mayor dan minor. Data training dan data testing divariasikan dalam 4 model menggunakan 5-fold crossvalidation. Ekstraksi ciri akan dilakukan dengan metode Mel Frequency Cepstrum Coefficients, dan klasifikasi akan dilakukan dengan metode Fuzzy Learning Vector Quantization (FLVQ). Pemodelan FLVQ dilakukan dengan melakukan variasi pada learning rate serta koefisien fuzzyness. Penelitian ini telah berhasil membentuk model FLVQ dengan akurasi rata-rata 79.38% serta akurasi maksimum 100%. Akurasi maksimum dicapai dengan nilai learning rate α sebesar 0.05 dan koefisien fuzzyness β sebesar 0.05 menggunakan epoch sebanyak 20 pada FLVQ model 2.
Keyword: chord, FLVQ, MFCCs, modeling, note.