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: Pemanfaatan alat pengusangan cepat (APC) IPB 77-1 MM untuk pendugaan vigor daya simpan benih kedelai (Glycine Max (L.) Merr.)
Abstrak: The research was conducted at the Laboratory of Seed Science and Technology, Department of Agronomy and Horticulture, Faculty of Agriculture, Bogor Agricultural Institute from April to May 2012. The objective of the research was to test the utilization of Rapid Aging Tools (APC) IPB 77-1 MM to estimate the shelf life vigor of soybean (Glycine max (L.) Merr.) seed and to obtain the procedures for using APC IPB 77-1 MM. This research used physical accelerated aging and chemical accelerated aging on soybean seed of different vigor levels by using APC IPB 77-1 MM. The working principle of this tool is aging seed with a scourging heat vapor for physical accelerated aging and the steam of 95% ethanol for chemical accelerated aging during a given period. The results showed that APC IPB 77-1 MM can be used to estimate the shelf life of soybean seed vigor with physical accelerated aging and chemical accelerated aging. However, a method of physical accelerated aging more consistent than with chemical accelerated aging. Physical accelerated aging conducted using a scourging heat vapor for 0, 1×15, 2×15, 3×15 dan 4×15 minutes on temperature and RH of 52°C and 89%, and chemical accelerated aging conducted using the steam of 95% ethanol for 0, 1×20, 2×20, 3×20 dan 4×20 minutes on temperature and RH of 32°C and 82%. In terms of technical, procedure of chemical accelerated aging easier to do than with physical accelerated aging.
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