Judul: Penghambatan Enzim Siklooksigenase-2 oleh campuran nanopartikel ekstrak Suruhan (Peperomia pellucida) dan Jahe Merah (Zingiber officinale)
Abstrak: Both suruhan (Peperomia pellucida) and red ginger (Zingiber officinale) were known to inhibit cyclooxygenase-2 but, the mixture of these two has a low inhibition of cyclooxygenase-2. The aim of this research is to test the potency of suruhan, red ginger, and its mixture in nanoparticle as a cyclooxygenase-2 inhibitor. Groups were divided into suruhan nanoparticle, red ginger nanoparticle, and suruhan-red ginger nanoparticle 1:1, 2:1, and 1:2. Nanoparticle was made using homogenation and ultrasonication. The inhibitory effect was analyzed using Enzyme-linked Immunosorbent Assay (ELISA) principle. The average size of suruhan nanopaticle was 90.61 nm and the Polidispersity Index was 0.22. Average size of red ginger nanoparticle was 173.46 nm and IP was 0.17. Maximum inhibition of cyclooxygenase-2 by nanoparticle of red ginger was 73.82% at 75 μg/mL, and 22.99 % by its mixture at 175.75 μg/mL. Nanoparticle of suruhan did not have an inhibitory effect, however its mixture with nanoparticle of red ginger (1:2) can inhibit cylooxygenase-2.
Keyword: Bogor Agricultural University (IPB), suruhan, red ginger, nanoparticle, inflammation, cyclooxygenase-2

Judul: Daya Hambat Siklooksigenase-2 oleh Campuran Ekstrak Suruhan (Peperomia pellucida) dan Jahe Merah (Zingiber officinale) dalam Inflamasi
Abstrak: Peperomia pellucida and Zingiber officinale were known to have anti-inflammatory activity, yet there was no further research to verify their inhibition in inflammatory process. The aim of this research is to test the potency of mixture extract of suruhan (Peperomia pellucida) and red ginger (Zingiber officinale) as anti-inflammation through in vitro inhibition of cyclooxygenase-2 enzyme. Anti-inflammatory effect was analyzed with ELISA (Enzyme Linked Immunosorbent Assay) and spectrophotometry method at wavelenghth 412 nm. Maximum inhibition of Peperomia pellucida extract against cyclooxygenase-2 was 48% at 100 μg/mL, Zingiber officinale extract inhibition was 44% at 300 μg/mL, and for mixture extract inhibition was 15% at 175 μg/mL. Mixture extract of Peperomia pellucida and Zingiber officinale showed lower inhibitory potency to cyclooxygenase-2 compared to their single extracts. Cytotoxicity test with Brine Shrimp Lethality Test method showed that Peperomia pellucida extract, Zingiber officinale extract, and mixture extract of both plants have a cytotoxity effect with each LC50 values are 339, 591, and 728 μg/mL. Phytochemical test showed that each extract contains flavonoid, phenolic, alkaloid, and tannin. Saponin and steroid were contained only in Peperomia pellucida extract and terpenoid was contained only in Zingiber officinale extract. Rendement extract of Peperomia pellucida is 24% and Zingiber officinale is 21%.
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Judul: Desain Sistem Transfer Energi Nirkabel Berbasiskan Tesla Coil
Abstrak: Tesla coil merupakan alat yang ditemukan oleh Nikola Tesla yang dapat mentransmisikan daya tanpa kabel dengan memanfaatkan prinsip induksi elektromagnetik. Pada penelitian ini dibuat sebuah prototype Tesla Coil dengan menggunakan transistor C1970 dan receiver menggunakan rangkaian LC. Identifikasi alat meliputi pengaruh daya input transmitter terhadap receiver, bentuk signal yang dipancarkan transmitter, pengaruh jarak transmitter dan receiver, nilai efisiensi serta efek alat terhadap perangkat lain. Hasil pengamatan menunjukkan bahwa semakin besar daya input maka semakin besar daya yang dipancarkan oleh transmitter. Bentuk sinyal yang dipancarkan oleh transmitter berupa gelombang listrik AC sinusoidal dengan frekuensi ~2.9 MHz. Semakin jauh jarak receiver terhadap transmitter maka semakin kecil amplitudo gelombang AC yang diterima oleh receiver, menyebabkan semakin kecil daya yang diterima oleh receiver. Adapun nilai efisiensi terbesar penangkapan daya oleh receiver yaitu sebesar 0.00516 % serta terdapat gangguan pada alat-alat tertentu seperti monitor komputer dan radio.
Keyword: rangkaian LC, receiver, tesla coil, transistor C1970, transmitter