Judul: Biodiversity, Ethnobotany, and Antioxidant Ability of Selaginella spp. from Halimun-Salak Mountain National Park (TNGHS).
Abstrak: Biodiversity and ethnobotany of Selaginella were studied in Halimun-Salak Mountain National Park (TNGHS) to describe the diversity and the use of Selaginella as medicinal plant. The diversity study of Selaginella was done by exploring Selaginella at 6 sampling points. The ethnobotany study of Selaginella was done by interviewing respondents at the villagers around Bunder Mountain, Citalahab Sentral, and Kasepuhan Adat Banten Kidul. There were eight species Selaginella found in TNGHS which were S. willdenovii, S. ornata, S. plana, S. intermedia, S. involvens, S. alutacia, S. subalpina and one species that has not been identified yet. The first two species were found dominantly in this location. The community in the location of study called Selaginella as paku rane. At the villages around Bunder mountain and Citalahab Sentral, Selaginella is also called as rande. The plant was traditionally used as fresh vegetables, postnatal and wound treatment, and body fitness maintenance. Antioxidant ability of Selaginella was tested by performing hydroxyl radical scavenging activity based on Fenton reaction. Three species of Selaginella were tested their hydroxyl radical scavenging activity. S. plana was the most potential species as an antioxidant followed by S. ornata and S. willdenovii. The crude extract of S. plana showed the best antioxidant activity at concentration of 75 μg/ml. Key words: Selaginella, biodiversity, ethnobotany, antioxidant, Halimun-Salak Mountain National Park (TNGHS)
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Judul: Aktivitas antioksidan ekstrak selaginella
Abstrak: Selaginella (Selaginellaceae) is a pteridophyte plant, having a lot of potential and benefits as food material and pharmaceutical. As a medicinal plant, Selaginella has been used as anti-cancer, anti-tumor, and antioxidant. The objective of the study was to analyze the potential of S. ornata, S. plana, and S. willdenovii extract as antioxidant by measuring lipid peroxidation (MDA level) and Superoxide Dismutase (SOD) activity. This experiment was started with LD50 test of three kinds of Selaginella extract as preliminary experiment. The experiment was designed as complete randomize design with two factors. The first factor was three species of Selaginella and the second factor was four doses of Selaginella extracts, which were 0, 0.3, 0.6, and 1.2 g extract/kg bw. The result showed that at the dose of 0.6 g extract/kg bw, Selaginella extract could decrease the MDA level to the lowest level. The dose of 0.3 g extract/kg bw could increase the SOD activity. Among the three species of Selaginella extract, S. ornata showed the best antioxidant activity.
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Judul: Approximation of the Median of Poisson Distribution Using the Relation of Poisson-Gamma Distribution
Abstrak: A major drawback of median is that median cannot usually be defined in closed form, even in the cases where their distribution functions are known. This study gives an approximation of the closed form for the median of the Poisson distribution by using the relation of Poisson-Gamma distribution. The approximation uses elementary techniques based on the monotonicity of certain sequences involving tail probabilities of the Poisson distribution and the Central Limit Theorem. Furthermore, a closed form expression for the mean absolute deviation 􀜧|􀜰􀰒 􀵆 􀜯􀝁􀝀􁈺􀜰􀰒􁈻| is also studied. The median is relevant because of the fact that it minimizes the mean absolute deviation of a Poisson random variable (􀜰􀰒􁈻 by considering median as central tendency.
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