Judul: Karakterisasi Morfologi dan Pertumbuhan Beberapa Genotipe Ubi Kayu (Manihot esculenta Crantz) Hasil Induksi Mutasi Menggunakan Iradiasi Sinar Gamma
Abstrak: Penelitian ini bertujuan untuk mempelajari pertumbuhan dan keragaman beberapa genotipe ubi kayu yang telah diinduksi iradiasi sinar gamma. Setek batang ubi kayu diiradiasi di Laboratorium Pusat Aplikasi Teknologi Isotop dan Iradiasi (PATIR), Badan Tenaga Nuklir Nasional (BATAN) kemudian ditanam di Kebun Percobaan Cikabayan IPB pada bulan Mei 2012 sampai April 2013. Penelitian dirancang menggunakan rancangan kelompok lengkap teracak (RKLT) dengan dua faktor, faktor pertama yaitu dosis iradiasi sinar gamma yang terdiri atas lima taraf yaitu 0, 15, 30, 45, dan 60 gray, faktor kedua adalah perbedaan genotipe yang terdiri dari Ratim, Jame-jame, UJ5, Malang 4, dan Adira 4. Hasil penelitian menunjukan iradiasi mengakibatkan tanaman mati sebanyak 146 tanaman saat berumur 0-2 bulan setelah tanam (BST). Perlakuan iradiasi mengakibatkan berkurangnya jumlah stomata dan jumlah umbi terhadap beberapa genotype. Perlakuan iradiasi 15 gray menghasilkan tinggi tanaman dan umbi yang lebih besar dibandingkan kontrol dan dosis 30 gray. Hasil karakterisasi menunjukan bahwa perlakuan iradiasi mengakibatkan berubahnya karakter morfologi beberapa genotipe ubi kayu.
Keyword: cassava, characterization, genotypes, morphology, mutations

Judul: Karakterisasi Morfologi dan Pertumbuhan Beberapa Genotipe Ubi Kayu (Manihot esculenta Crantz) Hasil Induksi Mutasi Menggunakan Iradiasi Sinar Gamma
Abstrak: This reseach aims to study the growth and variability of several cassava genotypes through mutation induction irradiation. Stem cutting of cassava were irradiated in PATIR-BATAN and planted in Cikabayan Experimental Field, IPB from May 2012 to April 2013. This research was arranged in randomized completely block design with two factor that was gamma ray irradiation rate. Gamma irradiation rate consisted of five levels i.e. 0, 15, 30, 45, and 60 gray (Gy), second faktor that diferent genotypes consisted of five genotypes i.e. Jame-jame, Ratim, UJ5, Malang 4, and Adira 4. Results showed irradiation resulted in 146 plant death when plant are 2 months after planting. Irradiation treatment resulted in reduced number of stomata and number of tubers several genotype. 15 gray irradiation dose treatment produces larger tubers and plant height than control treatment and 30 gray of radiation dose. Characterization result showed that irradiation treatment resulted in changes in several morphological characters cassava.
Keyword: mutations, morphology, genotypes, characterization, cassava

Judul: Truncated Stop Loss as a Optimal Solution of Reinsurance Agreement in One-Period Model
Abstrak: Reinsurance is one of risk management efforts of an insurance company, which is called the cedent. Similar with insurance, reinsurance constitutes the cedent to pay the premium. We consider one-period reinsurance model and derive a rule which minimizes the ruin probability of the cedent for a fixed reinsurance premium. Therefore, it is needed to construct an optimal reinsurance agreement for the cedent. The premium is calculated according to four different principles, i.e. economic, generalized zero-utility, Esscher, and mean-variance principles. Stop loss is a reinsurance contract which protect the insurance company for losses that exceed a certain amount. The result of this research shows that a truncated stop loss is an optimal agreement in the class of all reinsurance contracts with various premiums calculated using above mentioned principles.
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