Judul: Ethyl Methane Sulphonate Treatment Mutation Induction on Anther Cultures of Hot Pepper (Capsicum annuum L.) and Its Effect on Embryogenesis Capacity
Abstrak: Metode kultur antera yang efisien pada sistem media dua lapis telah dikembangkan untuk memproduksi tanaman haploid ganda (HG) cabai kultivar lokal Indonesia (Capsicum annuum L.). Untuk percepatan dalam menghasilkan variasi genetik dan perbaikan sifat dari cabai, metode kultur antera ini dikombinasikan dengan teknik mutagenesis dalam penelitian ini. Induksi mutasi dilakukan melalui perendaman antera sebagai sumber eksplan pada larutan etil metan sulfonat (EMS) konsentrasi 0.1% dan 0.5% selama 1, 3, dan 6 jam sebelum kultur. Perlakuan EMS 0.1% selama 6 jam tidak hanya dapat menginduksi mutasi, tetapi juga meningkatkan respon embriogenesis, rata-rata embrio lengkap, dan rata-rata embrio berkecambah. Mutasi yang terjadi dapat dideteksi pada tanaman yang berasal dari kultur antera pada sifat morfologi daun dan batang, serta isozim peroksidase, aspartat aminotransferase, dan esterase. Metode kultur antera yang dikombinasikan dengan teknik mutagenesis ini dapat digunakan untuk mempercepat proses pemuliaan tanaman cabai kultivar lokal Indonesia.
Keyword: 

Judul: Responsivitas dan Kapasitas Androgenesis Beberapa Genotipe Cabai dan Terong dalam Kultur Antera pada Media Dua-Lapis
Abstrak: Productivity of hot pepper (Capsicum annuum L) and eggplant (Solanum melongena L) can be improved through the use of good quality seeds, such as hybrid seeds. Development of hybrid seed requires parental in the form of a pure lines, which is can be produced quickly using anther culture. The purpose of the study was to test the application of anther culture technique with a double-layered medium system that has been developed in hot pepper (pepper method) and tobacco (tobacco method) for several genotypes of hot pepper and eggplant. A double-layered medium system was culturing anther in liquid medium above the solid medium and incubated under certain condition. The result was that the pepper method successfully induced androgenesis for three types of plant that were all genotypes of pepper, eggplant var Antaboga, and tobacco SR1, while tobacco method was only successful for tobacco SR1. Androgenic responsiveness for genotypes tested was big hot pepper var Tombak (77 %), China big hot pepper (67 %), curly type-1 hot pepper (21 %), curly type-2 hot pepper (10 %), and eggplant var Antaboga (7 %). The result of total embryos per bud for each genotype of pepper was 5.7, 1.7, 0.3, and 0.5, respectively. Total embryos for eggplant var Antaboga was 0.2 embryos per bud. The result of ploidy analysis at one anther culture derived plant for curly hot pepper was haploid and eggplant was mixoploid that both proved the androgenesis process. This method of anther culture with pepper method has the potential to be tested on other members of genus Solanum, such as tomato which still quite difficult to induce its androgenesis.
Keyword: Bogor Agricultural University (IPB), eggplant., tobacco, pepper, double-layered medium, anther culture

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