Judul: Pertumbuhan Bibit Jeruk Keprok (Citrus nobilis) Hasil Okulasi pada Berbagai Media Tanam dan Umur Batang Bawah Rough Lemon (Citrus jambhiri Lush)(
Abstrak: The objective of this research was to study Citrus nobilis budding seed development on various growing medium and age of Citrus jambhiri Lush rootstock. The research was conducted in BPTP experimental garden, Cipaku, Bogor from November 2011 to May 2012. The research was consisted of two experiment, i.e. experiment before budding and experiment after budding. The design of experiment was complete randomized groups with two factors and three replications. The first factor was the growing medium that consists of soil, charcoal husk, sheep’s manure, compost, and vermi-compost. The second factor was the age of Rough Lemon citrus rootstock i.e. 8 , 11, and 14 months. The results showed that the highest wet and dry weight of root were found in the plant which planted in the growing media of (soil: charcoal husk: compost or vermicompost) mixture. The best weight of wet and dry root were found in the age of citrus rootstock 8 months. The best height and diameter of Rough Lemon rootstock were found in the age of citrus rootstock 11 months. The growing media of (soil: charcoal husk: vermicompost) mixture was the best media to Citrus nobilis scion budding development. The best Citrus nobilis scion budding development were found in the age of citrus rootstocks 11 months which adapted during 3 months in the growing media. The best percentage of sprout bud, percentage of dormant bud, increase of length bud, length of bud, length of leaves, and width of leaves were found in the age of citrus rootstock 11 months which adapted during 3 months in the growing media of (soil: charcoal husk: vermicompost) mixture.
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Judul: Optimization of Basic Media and Growth Regulator for In Vitro Multiplication of Jeruk Kunci (Citrus x microcarpa Bunge) Plant
Abstrak: Jeruk kunci (Citrus x microcarpa) merupakan tanaman jeruk dengan habitus semak yang banyak tumbuh di wilayah Bangka-Belitung. Jeruk ini memiliki banyak manfaat baik secara langsung atau tidak langsung. Akan tetapi, pertumbuhan dan perkembangbiakannya lambat, sehingga salah satu upaya memperbanyak tanaman tersebut ialah dengan kultur in vitro. Penelitian ini bertujuan menentukan kombinasi antara media dasar MS atau DKW dengan BAP yang optimal untuk multiplikasi tunas jeruk kunci secara in vitro. Penelitian ini menggunakan RAL dengan dua faktor, yakni jenis media dan taraf konsentrasi BAP. Pemberian BAP pada 0,1-2,0 mg/L ke dalam media MS atau DKW mampu menginduksi kalus dan tunas adventif dibandingkan tanpa BAP. Perlakuan DK3 dan DK4 menunjukkan waktu muncul kalus tercepat pada minggu kedua, sedangkan waktu muncul tunas adventif secara berurutan juga paling cepat pada minggu ketiga dan kelima. Rata-rata jumlah tunas adventif (7,2 tunas), tinggi tunas (2,14 cm), jumlah tunas aksilar (19,6 tunas), dan jumlah daun (50,4 helai) tertinggi ditunjukkan oleh perlakuan DK3., Citrus x microcarpa, given in Indonesia as jeruk kunci, is a citrus plant with a shrub habitus that grows in the majority in the Bangka-Belitung Islands, offering numerous direct and indirect benefits. However, its growth and reproduction are slow, so one of the efforts to reproduce the plants is by in vitro culture. This study aimed to determine an optimal combination of MS or DKW basic media with benzyl amino purine (BAP) growth regulator to get multiple shoots in vitro. This study was designed in CRD with two factors: the basic media type and BAP concentration levels. The provision of BAP at 0,1-2,0 mg/L added to MS or DKW media induced callus and adventitious buds compared to the control without BAP. The DK3 and DK4 treatments showed the fastest callus emerging time, which was in the second week, while adventitious buds were also obtained the most rapid in both media, the third and fifth weeks, respectively. The highest average number of adventitious buds (7,2 buds), shoot height (2,14 cm), number of axillary buds (19,6 buds), and number of leaves (50,4 leaves) were shown by treatment DK3.
Keyword: adventitious bud, axillary bud, BAP concentration, basic medium

Judul: igenvalues and Eigenvectors of Tridiagonal Matrix with Non Constant and Recurrent Diagonal Entries.
Abstrak: Matriks tridiagonal adalah suatu matriks yang mempunyai entri-entri bernilai nol kecuali pada diagonal utama, di bawah diagonal utama (subdiagonal) dan di atas diagonal utama (superdiagonal). Entri pada diagonal utama tidak konstan dan berulang. Setiap entri pada matriks tridiagonal ini adalah bilangan kompleks. Dalam karya ilmiah ini, akan dibuktikan 3 teorema untuk menentukan nilai eigen dengan 2 kasus dan 1 teorema untuk menentukan vektor eigen. Teorema pertama menentukan polinomial karakteristik dari matriks tridiagonal. Polinomial karakteristik dari matriks tridiagonal tersebut digunakan untuk menentukan nilai eigen pada teorema kedua dan ketiga serta menentukan vektor eigen pada teorema keempat
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