Judul: Aktivitas Antioksidan serta Korelasinya dengan Kadar Fenolik dan Flavonoid Total pada Enam Tanaman Hias.
Abstrak: Senyawa antioksidan dapat diperoleh dari berbagai tumbuhan seperti halnya tanaman hias. Enam tanaman hias yaitu Aerva sanguinolenta (L.) Bulme, Hydrangea macrophylla (Thunb.) Ser., Torenia violacea (Azaola ex Blanco) Pennell, Allamanda cathartica L., Acalypha siamensis Oliv. Ex Gage, dan Anthurium crystallinum Linden & André dimaserasi menggunakan pelarut etanol yang dilanjutkan dengan menentukan kadar fenolik, dan flavonoid total serta aktivitas antioksidan menggunakan metode 2,2-difenil-1-pikrilhidrazil (DPPH), reducing power, dan cupric ion reducing antioxidant capacity (CUPRAC). Kadar fenolik dan flavonoid total tertinggi terdapat dalam tanaman bokor. Acalypha siamensis Oliv. Ex Gage memiliki aktivitas antioksidan tertinggi pada metode DPPH, reducing power, dan CUPRAC dengan nilai masing-masing 180.45; 202.17; dan 589.90 μmol trolox/g serbuk kering. Kadar fenolik dan flavonoid total tidak berkorelasi secara nyata dengan aktivitas antioksidan pada enam tanaman hias.
Keyword: aktivitas antioksidan, fenolik total, flavonoid total, tanaman hias

Judul: Pengukuran Aktivitas Antioksidan dengan Metode Cuprac, DPPH, dan Frap serta Korelasinya dengan Fenol dan Flavonoid pada Enam Tanaman
Abstrak: Oxidative stress is the imbalance condition between free radical and antioxidants that can cause oxidative damage in cell, tissues, organ, accelerates the aging process, and emergence of diseases. This study aims to determine the antioxidant capacity of 6 herbs, and the relationship between phenol and flavonoids content with their antioxidant activity and relationship between phenol and flavonoids content in the ethanol extract of some Indonesian herb, there are Orthosiphon stamineus, Sonchus avensis, Sida rhombifolia, Guazuma umifolia, Andrographis paniculata, and Parkia biglobosa. The measurement of antioxidant activity use 3 methods, that are CUPRAC (cupric ion reducing antioxidant capacity), DPPH (2,2-diphenyl-1-pickrylhidrazyl), and FRAP (ferric reducing antioxidant power). The research of the six herbs showed antioxidant activity. Statistic test from three method antioxidant showed that measurement antioxidant activity with CUPRAC, DPPH, and FRAP gave a significantly different result, but CUPRAC and FRAP give the same response of the six herbs. The phenol has no correlation with flavonoids content but have highly correlation with their antioxidant activity. Flavonoids have no correlation with 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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