Judul: Kemunduran Benih Kedelai Hitam Akibat Pengusangan Cepat dengan APC IPB 77-1 MM dan Penyimpanan Alami
Abstrak: Seed deterioration is degradation processes gradually, cumulative, and irreversible due to chages caused by fisiologis factor. This research were conducted to determine the suitability of viability, vigor, and upsurge of free fatty acid between natural storage and accelerated aging of black soybean varieties Detam 1 dan Detam 2. The experiment were conducted in the Seed Science and Technology Laboratory, Department of Agronomy and Horticulture, Faculty of Agriculture, Bogor Agricultural University from April 2013 to Juni 2013. The research consisted of two experiment the natural storage and accelerated aging. The natural storage is done at temperature 27°C–29°C and RH 70%–75% while the accelerated aging soybeas seeds aged physically in APC IPB 77-1 MM at temperature 45°C–50°C and RH 87%–90%. Results of this study obtained compliance decreased viability, vigor, and increase free fatty acid between natural storage and accelerated aging in the two varieties of soybean. The observation of free fatty acid varieties Detam 1 has the same value at 0 to 8 weeks of storage with accelerated aging time 0 to 45 minutes. Free fatty acid values of varieties Detam 2 at 0 to 8 weeks of storage has the same value with accelerated aging time 0 to 30 minutes with the assumption that the value of free fatty acids in storage for 10 weeks had an increased.
Keyword: vigor, viability, free fatty acid

Judul: Kemunduran Benih Kedelai Akibat Pengusangan Cepat Menggunakan Alat IPB 77-1 MM dan Penyimpanan Alami
Abstrak: Seed deterioration characterized by decrease in viability, vigor and an increase in free fatty. This research was conducted to determine the comformity of the decrease in viability, vigor and an increase in free fatty acids of soybean seed of varieties Anjasmoro and Wilis has aging using accelerated aging machine IPB 77-1 MM compared to natural storage and to determine correlation between viability and vigor compared to free fatty acids. The research consisted of two experiments the natural storage and accelerated aging. Natural storage consists of 5 of storage periods of 0, 2, 4, 6, 8 weeks while accelerated aging consists of 5 of aging periods of 0, 15, 30, 45, 60 minutes. The result showed that the conformity (significant) decrease in viability and vigor between natural storage for 8 weeks compared to accelerated aging for 60 minutes, while in free fatty acids absence of conformity (not significant) between natural storage for 8 weeks (assumed after natural storage for 8 weeks will be increase free fatty acids) compared to accelerated aging for 30 minutes (Anjasmoro) and 15 minutes (Wilis). Viability and vigor compared to free fatty acids had negative correlation, it means increase in free fatty acids effect to decrease in viability and vigor.
Keyword: 

Judul: Penggunaan Teorema Homeomorphy 2-Manifold dan Teorema Euler Poincare pada Torus 𝑇�� dan Simplicial Complex 𝐾��
Abstrak: Two dimensional topological spaces are said to be homeomorphic if they have the same topological invariant, where one of topological invariant used is an Euler characteristic. Homeomorphy 2-Manifold’s Theorem and Euler Poincare’s Theorem are used to distinguish two topological spaces. Homeomorphy 2-Manifold’s Theorem uses Euler characteristic to identify two dimensional topological spaces. Euler Poincare’s Theorem is an alternative way to find Euler characteristic with Betti number, which is topological invariant as well. The objective of this paper is to investigate the homeomorphism of torus 𝑇����� and simplicial complex 𝐾�����. Topological space torus and simplicial complex 𝐾����� have the same Euler characteristic, which is two. Based on Homeomorphy 2-Manifold’s Theorem topological space torus 𝑇����� and simplicial complex 𝐾����� is homeomorphic.
Keyword: simplicial, torus, Euler, homeomorphism, topology