Judul: Fungsi Hati Mencit pada Uji Toksisitas Subkronis Ekstrak Air Kulit Batang Mahoni (Swietenia macrophylla King)
Abstrak: Mahogany’s bark is industrial waste that can potentially be developed as herbal medicines. This research was performed to study the extract’s subchronic toxicity in the liver. Fourty mice consist of 20 males and 20 females were divided into 4 groups: normal, dosage 1 (D1), dosage 2 (D2), and dosage 3 (D3), each consisting of 5 males and 5 females. Normal group was administered with aquadest, whereas D1, D2, and D3 groups were orally gavaged with mahogany’s bark aqueous extract at concentration of 21, 200, and 400 mg/Kg BW for 56 days. Biochemical and histopathological parameters were observed at the end of experimental period. There were no difference in body weight, food intake, and liver enzymes. Range of ALT and AST activities were consecutively between 54.20±15.09 to 83.00±44.98 U/L and 83.80±21.73 to 164.33±99.28 U/L, and these values were normal. There was no toxic effect of mahogany’s bark aqueous extract to the liver, moreover according to histopathological examination the extract tended to protect female hepatocytes from nonspesific degeneration.
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Judul: Aktivitas Antioksidan Superoksida Dismutase Pada Hati Tikus Hiperkolesterolemia Yang Diberi Ekstrak Kulit Mahoni (Swietenia macrophylla)
Abstrak: Mahoni’s stem bark is wood industrial waste that rich in secondary metabolites. Research about its antioxidant potency has been done previously. This research was performed to study about the mahoni’s bark extract mechanism on lowering lipid peroxidation by determining the activity of endogenous antioxidant in the liver. Thirty five male rats were divided into 5 groups (n=7) normal, hypercholesterolemic, lovastatin, extract 1, and extract 2 group. Normal group fed with standard rat chow, hypercholesterolemic group (HK) with cholesterol chow (1,5%) and PTU (0,5 mg/KgBW), lovastatin group (HK + lovastatin 0,2857 mg/KgBW), E1 group (HK+ mahoni extract 4,2 mg/KgBW), and E2 group (HK + mahoni extract 21 mg/KgBW). Experiments were carried out for 8 consecutive weeks. The rat liver superoxide dismutase (SOD) antioxidant activity were determined by calculating the inhibition percentage of pyrogallol autooxidation process became purpurogallin by SOD, total formed purpurogallin was measured using spectrophotometer with 340 nm wavelength. The SOD antioxidant activities in normal group of rats was 47.96±12.37%. There was not any significant SOD antioxidant activities difference between all rats group of treatment (=0.05). These result showed that mahoni’s bark extract roles as antioxidant in rats was achieve not by increasing the activity of superoxide dismutase but by other mechanism.
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Judul: Query Expansion based on Bilingual Dictionary Using Conditional Probability
Abstrak: Query expansion is a technique that can be used to bridge vocabulary gaps between queries and documents in the collection. With query expansion, user will be helped to formulate queries well so that user will optimize the search result. In this study, the expansion term was resulted from the translation of bilingual dictionary. Subsequently, several terms of expansion were elected based on the closeness of its relationship with the original query. This research showed that conditional probability can be used to select expansion term in bilingual translation method query expansion. The result of 1000 documents was more than 97% relevan document can be retrieved by this system. The more expansion term used, the larger number relevan document was retrieved.
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