Judul: Kandungan Flavonoid Kulit Kayu Mahoni (Swietenia macrophylla King.) dan Toksisitas AkutnyaTerhadap Mencit
Abstrak: Mahoni bark represent industrial waste product of wood industry which have low economic value. Mahoni bark has been known as antioxidant. That activity can’t be separated phytochemicaly compound, flavonoid. This research aim to determine active compound content and total flavonoid concentration of mahoni bark which extracted by water and methanol. Phytochemical analysis done by Harborne methods (1987) and total flavonoid concentration determination done by spectrophotometry methods. LD50 determination of acute toxicity done by Reed-Muench methods. Alkaloid, flavonoid, tannin, saponin, and triterpenoid known represent at water and methanol extract. Total flavonoid concentration of water and methanol extract are 0.0402% (b/b) and 0.2016% (b/b). LD50 of water extract is 21428.91 mg/kg BW and LD50 of methanol extract is 16330.52 mg/kg BW. According to Gleason classification, both of extract included in the non toxic materials. Result of histopatology analysis shown water extract tend to destroy kidney and methanol extract tend to destroy liver. Microscopic picture show tendency of heavier damage effect of administration of both bark extract at dose more than 5000 mg/kg BW.
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Judul: Penentuan Total Fenolik, Flavonoid, dan Aktivitas Antioksidan Ekstrak Kulit Kayu Mahoni (Swietenia Macrophylla King) pada Berbagai Konsentrasi Etanol.
Abstrak: Pohon mahoni (Swietenia Macrophylla King) banyak ditemukan di dataran tinggi di Indonesia dan umumnya digunakan sebagai obat dan pestisida alami. Penelitian terdahulu sudah dilakukan mengenai aktivitas antioksidan dari berbagai macam pelarut, namun demikian belum diketahui pengaruh perbedaan konsentrasi pelarut etanol terhadap kandungan senyawa fenolik, flavonoid, dan aktivitas antioksidan kulit kayu mahoni. Penelitian ini bertujuan untuk menganalisis pengaruh perbedaan konsentrasi pelarut etanol terhadap senyawa metabolit sekunder dan aktivitas antioksidan. Kulit kayu mahoni diekstraksi dengan metode maserasi menggunakan pelarut air dan beberapa konsentrasi etanol (30%, 50%, 70%, dan 96%). Penentuan kadar total fenolik dan flavonoid menggunakan metode spektrofotometri, dan aktivitas antioksidan diukur menggunakan metode 1,1- diphenyl-2-picrylhydrazyl (DPPH). Hasil penelitian menunjukkan bahwa pelarut etanol 70% menghasilkan kadar total fenolik terbesar (123,16 mg GAE/g), sedangkan kadar total flavonoid terbesar dari etanol 50% (8,40 mg QE/g), dan aktivitas antioksidan terbesar terdapat pada pelarut air (27,22 µmol TE/g).
Keyword: antioksidan, DPPH, kulit kayu, mahoni

Judul: Implementasi Algoritme Enkripsi Advanced Encryption Standard secara Paralel dengan GPU NVIDIA CUDA
Abstrak: Processor streaming architecture in GPU has provide general purpose computation which have its own potential to help CPU with its parallel computation capability. One example of supported processor streaming architecture is Fermi which is developed by NVIDIA. Furthermore, NVIDIA has developed its own software development kit namely CUDA, which can integrate many popular existing programming languanges such as C++ for GPU-based parallel computation. This research focus on the implementation of parallel AES algorithm with GPU and analyze the performance result of the implementation in two different NVIDIA devices, namely NVIDIA GeForce GT220 and NVIDIA Quadro 600. In general, the performance of parallel GPU computation is better than sequential computation for large data input. It is obtained that the maximum speedup of NVIDIA GeForce GT220 in 8 MB input is 89.3 with 180% efficiency. Higher speedup of 101.6 can be obtained by NVIDIA Quadro 600 with the same input size with around 100% efficiency.
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