Judul: In Vitro Shoot Induction of Kaempferia parviflora Wall. Ex. Baker
Abstrak: This research aimed to find the best MS salt concentration and cytokinin (BAP) concentration for K. parviflora rapid multiplication by using in vitro buds as explants. The experiment was done at Plant Tissue Culture Laboratory of Agronomy and Horticulture Department, Faculty of Agriculture, Bogor Agricultural University from January to November 2011. This research began by sterilizing shoots of K. parviflora rhizomes received from PT. Ogawa Indonesia to produce axenic culture. After about 8 weeks of growth, young shoots began to sprout. The young shoots of K. parviflora axenic culture were then cut and cultured individually on the treatment medium, which consist of two different MS salt concentrations (MS and ½ MS) and five different 6-benzylaminopurine (BAP) concentrations (0, 1.25, 2.5, 3.75, and 5 ppm) respectively. Explants started to grow after 2 weeks of culture. Both MS salt concentration and BAP concentration treatments did not give a significant effect on the first shoot induction time, but ½ MS medium supplemented with 5 ppm BAP could induce first shoot faster than other treatments, which is within an average of 2.5 weeks after cultured (WAC). At early observation (2 to 4 WAC), medium enriched with 3.75 ppm BAP induced more shoot than the other treatments, but at the end, control medium (MS0) induced more shoot than other treatments. Starting from 2 WAC, the explants cultured on 0 ppm BAP medium grow more rapidly than the other treatments, but after 10 WAC, they grow slower. All treatments have the same trend of leaf growth. At 2 to 8 WAC, the number of leaves is rising rapidly, but at the 9 WAC, it began to slow down.
Keyword: 

Judul: Inisiasi Rimpang Mikro Kaempferia parviflora Secara In Vitro dengan Penambahan BAP dan Sukrosa
Abstrak: Kaempferia parviflora is a medicinal plant that contains secondary metabolites and efficacious for treating various diseases. Rapid multiplication of K. parviflora through its rhizome is hamprered by the long period needed to produce the rhizome. The objectives of this research were to obtain the best sucrose concentration and to determine the best BAP concentration in the in vitro micro rhizome initiation of K. parviflora. The experiment was arranged in a randomized complete block design with two factors and three replications. The first factor was BAP concentration, consisted of three levels i.e. 0, 2, and 4 mg L¯1. The second factor was sucrose concentration, consisted of four levels i.e. 0, 30, 60, and 90 g L¯1. Data obtained were analyzed by F-test, followed by DMRT (Duncan Multiple Range Test) at 5 % significant level. Sucrose concentration significantly affected the number of shoots and plantlets fresh weight. The results showed that K. parviflora could form micro rhizome in vitro, as indicated by the similar anatomical structure compared to the rhizome produced in vivo. K. parviflora cultured in MS medium cointaining 90 g L¯1 sucrose without BAP had the highest number of micro rhizome at 8 WAC.
Keyword: Bogor Agricultural University (IPB), traditional medicine, black galingale, health

Judul: Invers Drazin dari Matriks Toeplitz Singular
Abstrak: Matriks Toeplitz adalah matriks yang setiap unsur pada diagonal utama bernilai sama dan setiap unsur pada subdiagonal yang bersesuaian dengan diagonal utama juga bernilai sama. Matriks singular adalah matriks yang tidak bisa ditentukan inversnya. Akan tetapi, dapat diupayakan untuk ditentukan inversnya menggunakan invers matriks yang diperumum. Invers Drazin merupakan salah satu jenis invers matriks yang diperumum. Pada karya ilmiah ini ditentukan invers Drazin dari matriks Toeplitz singular dengan menggunakan metode Leverrier Faddeev. Kemudian, ditentukan invers Drazin dari matriks Toeplitz singular yang direpresentasikan sebagai penjumlahan segitiga bawah dan segitiga atas matriks Toeplitz berdasar pada teorema Gohberg dan Semencul., Toeplitz matrix is a matrix in with element on the main diagonal has the same value and on the subdiagonal corresponding to the main diagonal also has the same value. Singular matrix is a matrix that has no inverse. However, it can be attempted to determine the inverse using a generalized inverse matrix. Inverse Drazin is a type of generalized matrix inverse. This paper discussed the inverse Drazin for a singular Toeplitz matrix using the Leverrier Faddeev method. Then, the Drazin inverse of the singular Toeplitz matrix which is represented as a sum of products of lower and upper triangular Toeplitz matrix based on Gohberg and Semencul theorem.
Keyword: inverse Drazine, singular Toeplitz matrix