Judul: Lipid Peroxide Concentration in The Liver of Hyperlipidemic Rabbits Treated by Hypolipidemic Substance.
Abstrak: Degenerative disease has caused the highest mortality in the world. The disease may occur due to our life style which prefer fast food than traditional one and overeating resulted in hyperlipidemic. This condition will increase lipid peroxidation caused by free radicals in the body such as in the liver. The objective of this research is to determine the influence of hypolipidemic substance on lipid peroxide in the liver of hyperlipidemic rabbits. Twenty four male New Zealand White rabbits were divided into four group: group I (normal), group II (Hyperlipidemic), group III (mixture of Jati Belanda), and group IV (lovastatin). Lipid peroxide concentration was measured by TBA (thiobarbiturit acid) assay that measure malondyaldehida (MDA) as product of lipid peroxidation using spectrophotometer at λ = 532 nm (Yagi et al 1994). The result of the research showed that feeding rabbits with chow contains 0.5% cholesterol and 5% of palm oil caused hyperlipidemic. Lipid peroxide concentration of rabbit’s liver in group II increased two times compared with group I. Group III and IV had lower lipid peroxide concentration of rabbit’s liver compared with group II which is 58.83% and 49.06%. This data showed that Jati Belanda leave mixture and lovastatin decreased lipid peroxidation in the liver.
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Judul: Proses Peroksidasi Lipid Kelinci yang Hiperlipidemia pada Pemberian Senyawa Penurun Kolesterol
Abstrak: Free radicals, such as lipid peroxide, are having much attention right now because their significant role in degenerative disease. Hyperlipidemia is one of the major risk factor for atherosclerosis and lead to degenerative disease. The aim of this study was to determine the effect of cholesterol lowering substance to the blood peroxide lipid concentration in hyperlipidemic rabbit. Twenty four male New Zealand white rabbits were divided into four groups: normal (given standard rabbit feed), hyperlipidemia (given atherogenic rabbit feed contained 0.5% cholesterol and 5% coconut oil), lovastatin (given mixture of atherogenic rabbit feed and lovastatin 57 mg/day), and extract (given atherogenic rabbit feed and jati belanda leaves extract mixture). Thiobarbitnric acid (TBA) method was used in blood lipid peroxide analysis, measuring the MDA product by spectrophotometer at 532 nm. The result showed that the atherogenic rabbit feed caused the elevation of MDA concentration, which means the elevation of lipid peroxidation process. Blood lipid peroxide concentration in hyperlipidemia group increased 163.76% compared with normal group (1.30 ± 0.38 nmol/ml). Lovastatin and jati belanda leaves extract mixture can act as antioxidant which can lowering blood lipid peroxide concentration 46.92% and 53.03% respectively at 8th week compared with hyperlipidemia group.
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Judul: Pemanenan Energi Listrik dari Kincir Angin Vertikal
Abstrak: Usaha pemanenan energi angin di Indonesia masih sedikit. Sampai Tahun 2016 hanya 3.54 MW alat pemanenan energi angin yang sudah terpasang. Kendala utamanya ialah dibutuhkan investasi yang besar untuk membuatnya. Pembuatan kincir angin dengan ukuran yang lebih kecil dengan bahan yang dapat dibeli di pasar lokal menjadi solusi agar pembuatan kincir angin lebih ekonomis. Pembuatan kincir vertikal tipe Savonius dapat menjadi solusinya. Kincir vertikal Savonius dapat beroperasi pada kecepatan < 3 m/s dan ketinggian < 50 m. Kincir angin ini terdiri dari tiga sistem, yaitu generator, rotor kincir dan transmisi pulley-belt. Generator dibuat dari modifikasi motor AC dan magnet neodymium. Rotor kincir dibuat dari pipa PVC 4”, pipa alumunium ¾”, dan papan polikarbonat. Transmisi pulley-belt dibuat dari plastik dan karet. Kincir ini membutuhkan gaya minimal 3 N untuk dapat berputar atau torsi minimalnya 0.75 Nm. Kecepatan angin yang dibutuhkan untuk merotasikannya sebesar 1.9 m/s. Daya maksimal yang dapat dihasilkan ialah 5.76 watt berupa tegangan sebesar 36 volt dan arus 160 mA.
Keyword: energi terbarukan, generator, motor AC, sudu Savonius