Judul: Swietenia mahagoni Jacq
Abstrak: Tanaman dari famili Meliaceae merupakan tanaman yang banyak digunakan sebagai obat tradisional dan dipercaya dapat menyembuhkan penyakit kencing manis, tekanan darall tinggi, malaria, eksim, dan reumatik.
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Judul: Aktivitas Antioksidan Ekstrak Biji Mahoni (Swietenia mahagoni Jacq.) sebagai Kandidat Obat Antidiabetes
Abstrak: Diabetes mellitus (DM) is a progressive chronic degenerative disease with glucose, protein, and lipid metabolic dysfunction. DM is one of oxidative stress conditions that requiring additional exogenous antioxidants. Mahagony is potential for antioxidant which can be used as an antidiabetic medicine. The objective of this research is to compare antioxidant activity of several Swietenia mahagony seed extracts from different methods of extraction (reflux and maceration) and type of solvents (ethanol and water). Antioxidant activity of all extract were evaluated by DPPH method and quantified the IC50 values. The IC50 values of all extracts are 1.03 mg/ml, 1.87 mg/ml, 4.09 mg/ml, and 1.15 mg/ml, respectively to ethanol maceration extract (ME), water maceration extract (MA), ethanol reflux extract (RE), and water reflux extract (RA). The result showed that extract resulted from maceration method using ethanol has the highest antioxidant activity, compare to the others (MA, RE, and RA).
Keyword: Swietenia mahagoni Jacq, reflux, maceration, DPPH, antioxidant, Bogor Agricultural University (IPB)

Judul: Lawson Criterion Analysis of D-3He Fusion Reaction
Abstrak: Reaksi fusi merupakan reaksi penggabungan dua inti atom ringan menjadi inti atom baru yang lebih berat dengan melepas sejumlah energi. Kriteria Lawson sebagai syarat penting dalam reaksi fusi berkelanjutan. Penelitian ini bertujuan untuk mengetahui kriteria Lawson pada reaksi fusi D-³He dengan temperatur 75, 80, 85, 90, 95, 100 keV, pengaruh radiasi bremsstrahlung dan reaktivitas fusi menggunakan parameter Hively dan Bosch-Hale. Nilai reaktivitas Hively berada dalam rentang 1,121 × 10^(-22) – 1,726 ×10^(-22) m^3/s, tidak jauh berbeda dengan reaktivitas Bosch-Hale yaitu 1,208 × 10^(-22) – 1,718 × 10^(-22) m^3/s. Reaktivitas fusi mempengaruhi kriteria Lawson, yaitu berada dalam rentang 1,110 × 10^21 – 1,452 × 10^21 s/m^3. Nilai tersebut menunjukkan waktu kungkungan dan kerapatan plasma yang dibutuhkan untuk menghasilkan energi yang menguntungkan pada temperatur 75 – 100 keV sehingga fusi mencapai tahap ignition, Fusion reaction is a reaction where two light atomic nuclei merge into a new heavier atomic nucleus by releasing some energy. Lawson criterion is an important condition for sustainable fusion reactions. This study aims to determine Lawson criterion for the D-³He fusion reaction with temperatures of 75, 80, 85, 90, 95, 100 keV, the effect of bremsstrahlung radiation, and fusion reactivity using Hively and Bosch-Hale parameters. Hively's reactivity value is in the range of 1,121 × 10^(-22) – 1,726 ×10^(-22) m^3/s , not so much different from Bosch-Hale’s reactivity of 1,208 × 10^(-22) – 1,718 × 10^(-22) m^3/s. Fusion reactivity affects Lawson criterion which is in the range of 1,110 × 10^21 – 1,452 × 10^21 s/m^3. This value indicates the confinement time and plasma density required to produce net energy at a temperature of 75 – 100 keV so that fusion reaches the ignition stage.
Keyword: kriteria Lawson, radiasi bremsstrahlung, reaksi fusi, reaktivitas fusi, Lawson criterion, bremsstrahlung radiation, fusion reaction, fusion reactivity