Judul: Inhibisi ekstrak air dan etanol sambiloto (Andrographis paniculata [Burm.f.] Nees) terhadap aktivitas tirosin kinase
Abstrak: Tyrosine kinase is one of the cancer growth's triggers. An over activity of this enzyme caused by mutation will cause an uncontrotlabIe cell growth. Sambiloto (A. paniculata [Bm.f.] Nees) is a plant traditionally used as a herbal medicine. This plant contains andrographofide compound which has potency as an anticancer. This research investigated the inhibition of plant extract towards tyrosine kinase activity using enzyme linked immunosorbent assay (ELISA) technique and the result was compared with genistein (positive control).
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Judul: Uji daya inhibisi ekstrak kasar flavonoid smabiloto (Andrographis paniculata [Burm, F] Ness) dan temu putih (Curcuma zedoaria Roscoe) terhadap aktivitas tirosin kinase secara in vitro
Abstrak: Tirosin kinase mempunyai peran penting dalam perkembangan sel kanker. Senyawa yang dapat menjadi inhibitor spesifik tirosin kinase merupakan salah satu metode yang digunakan untuk mencari obat antikanker. Senyawa flavonoid berpotensi menghambat aktivitas tirosin kinase. Berdasarkan uji fitokimia, tanaman sambiloto (A. paniculata [Burm. F] Ness) dan rimpang temu putih (C. zedoaria Roscoe) mengandung senyawa flavonoid. Tanaman sambiloto dan rimpang temu putih diekstraksi dengan metode maserasi. Jenis pelarut dan nisbah perbandingan mengikuti metode maserasi Markham (1988). Ekstraksi menggunakan pelarut metanol-air dengan nisbah 9:1 dan 1:1. Setelah itu, dipartisi dengan pelarut heksana dan kloroform. Rendemen ekstrak kasar flavonoid sambiloto dan rimpang temu putih masing-masing sebesar 16,90% dan 19,81%. Selanjutnya, uji toksisitas larva udang dan penentuan total fenol dilakukan. Daya inhibisi ekstrak kasar sambiloto konsentrasi 300 ppm terhadap tirosin kinase adalah sebesar 67,19% atau lebih besar dari kontrol positif (genistein), yaitu sebesar 6,71%. Daya inhibisi ekstrak kasar flavonoid rimpang temu putih terhadap tirosin kinase konsentrasi 300 ppm dan 700 ppm masingmasing sebesar 2,83% dan 27,49% atau lebih tinggi dibandingkan genistein. Daya hambat ekstrak kasar sambiloto terhadap tirosin kinase cukup tinggi sehingga dapat berpotensi sebagai obat antikanker, sedangkan daya hambat ekstrak kasar flavonoid temu putih lebih rendah.
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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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