Judul: Multiplikasi Tanaman Lidah Mertua Blue Leaf (Sansevieria sp.) Melalui Kalus Secara in vitro
Abstrak: Sanseviera is a well-known ornamental plant leaves which is called lidah mertua blue leaf in Indonesia. Sansevieria sp. blue leaf has leaf width with tapered tip, wavy leaf side and green leaf with white reddish leaf side. The leaf cutting of Sansevieria sp. does not produce rooted shoots efficiently. This research was aimed to obtain an appropriate combination of basic media and plant growth regulators (PGR) to stimulate in vitro shooting and rooting through callus. Shooting was induced using two media (MS and WP) supplemented with (5mg/L and 7 mg/L) BAP in combination with 0.5 mg/L NAA. ¼WP liquid medium with 0.5 mg/L IBA and compost:zeolite:sand at a ratio of 4:4:1 were used as rooting medium. The results showed that WP with 5 mg/L BAP and 0.5 mg/L NAA is produced the best growth of the shoots and leaves for 23 week after planting (WAP). Medium ¼WP liquid with 0.5 mg/L IBA that incorporated in a mixture compost, zeolite, and sand were able to induce rooting on eight plantlets in 8 weeks after shoots were transfered into rooting.
Keyword: Sansevieria sp. blue leaf, in vitro multiplication, callus

Judul: Pengaruh media tanam dan panjang Stek daun terhadap inisiasi tunas Muda lidah mertua (sansevieria Trifasciata “lorentii”)
Abstrak: Penelitian ini dilakukan untuk mengetahui pengaruh media tanam dan panjang stek daun terhadap inisiasi tunas muda lidah mertua (Sansevieria trifasciata ‘Lorentii’) yang dilakukan di Kebun Percobaan Leuwikopo IPB Dramaga pada bulan November 2010 sampai Februari 2011. Rancangan percobaan yang digunakan adalah Rancangan Kelompok Lengkap Teracak (RKLT) dengan dua faktor dan tiga ulangan. Faktor pertama adalah media tanam terdiri atas campuran tanah dan pupuk kandang kambing, arang sekam dan serbuk kayu. Faktor kedua adalah panjang stek daun lidah mertua yang terdiri atas 5 cm, 10 cm, dan 15 cm. Hasil penelitian menunjukkan bahwa persentase stek hidup, persentase stek berakar, persentase stek bertunas, panjang akar, jumlah tunas, bobot basah dan bobot kering tunas tertinggi ditunjukkan oleh stek dengan panjang 15 cm yang ditanam di media campuran tanah dan pupuk kandang kambing. Media terbaik untuk memicu inisiasi tunas muda Sansevieria adalah media campuran tanah dan pupuk kandang kambing. Panjang stek Sansevieria terbaik untuk perakaran adalah 10 dan 15 cm, sedangkan panjang stek terbaik untuk inisiasi tunas muda Sansevieria adalah panjang stek 15 cm. Stek Sansevieria dengan panjang 15 cm yang ditanam pada media campuran tanah dan pupuk kandang kambing merupakan perlakuan terbaik untuk inisiasi tunas muda Sansevieria.
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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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