Judul: Aplikasi Bakteri dalam Perlakuan Seed Coating untuk Mempertahankan Viabilitas dari Benih Cabai (Capsicum annuum L.) yang Sehat
Abstrak: This research was conducted to study the effect of seed coating using Bacillus subtilis, Pseudomonas group fluorescens and Serratia marcescens toward the viability of undiseased chilli seed (Capsicum annuum L.) during storage. This study used nested design with three replications. The main plot is storage period (0, 3, 6, 9, 12, 15, 18, 21 and 24 weeks) and the subplot is seed coating treatment with bacteria (Bacillus subtilis, Pseudomonas group fluorescens, Serratia marcescens and control). Chilli seed IPB C5 still have a good viability until 24 weeks, showed from the percentage of germination that is 77.3%. Control and coating used bacteria treatment showed unsignificant difference on germination, vigour index, growth rate and normal seedling dry weight. The bacteria as coater were still alive until 24 weeks of storage periode with population 5.89 x 104 cfu g-1 for Pseudomonas group fluorescens, 4.79 x 104 cfu g-1 for Bacillus subtilis and 1.70 x 104 cfu g-1 for Serratia marcescens.
Keyword: 

Judul: Pelapisan Benih menggunakan Bakteri Probiotik untuk Mempertahankan Viabilitas Benih Jagung Manis (Zea mays saccharata Sturt.) selama Penyimpanan
Abstrak: This research aims to evaluate the effect of seed coating by Bacillus subtilis, Serratia marcescens, and Fluorescent Pseudomonads to sweet corn seed (Zea mays saccharata Sturt.) during storage. Research was conducted on nested plot design (Nested Design) with the main plot was the storage period ( 0, 3, 6, 9, 12, 15, 18, 21, and 24 week), and the subplot was the coating treatment ( control, Bacillus subtilis, Serratia marcescens, and Fluorescent Pseudomonads). Interaction of seed coating treatment and seed storage period showed significant effect to seed germination, seed vigour index, dry weight normal seedling, seed moisture content, and population of bacteria. The dry weight normal seedling of seed that was coated by bacteria showed the better dry weight normal seedling result than control seeds. Bacillus subtilis can maintain the seed germination up to 64.0%. Serratia marcescens can maintain the seed germination up to 60.0%, while control seed only have 56.7% seed germination. Based on seed germination result seed coating using Bacillus subtilis and Serratia marcescens are the treatment that more potential to be developed. Bacillus subtilis bacteria showed the best ability to survive until 24 week storage period. The population on Bacillus subtilis until 24 week storage period is 14.2 × 104 cfu g-1.
Keyword: 

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