Judul: Pengujian Vigor Daya Simpan Benih Kubis (Brassica oleracea var. capitata L.) Menggunakan Metode Pengusangan Cepat dengan Etanol
Abstrak: The objective of this study was to obtain an effective soaking time on the accelerated aging method with liquid ethanol 20%, that can estimate vigor related to storability of 6 cabbage seeds after storage for 6 months. Cabbage seed consists of 6 commercial seed lots with different initial vigor, they were G1, MG, GC, GT, B3, and KC. The first experiment was storing seed for 6 months within aluminium foil packaging in the open storage room with temperature 23.329.9 C and 6185% relative humidity. The second experiment was rapid aging by soaking seeds in liquid ethanol 20% during 30, 60, 90, and 120 minutes. Index of vigor seed after soaking during 30 minutes had a closed correlation with germination of seed after storage for 6 months with a coefficient correlation 0.92, so that could be used to predicted vigor related to storability seed. Vigor related to storability cabbage seed after storage for 6 months could be predicted by the equation , with x indicated indeks of vigor seed after soaking in liquid ethanol 20% during 30 minutes, and coefficient determination (R2) was 83.8%.
Keyword: Bogor Agricultural University (IPB), viability, devigoration, deterioration

Judul: Deteksi Vigor Daya Simpan Benih Padi Gogo (Oryza sativa L.) dengan Metode Pengusangan Cepat
Abstrak: Storability is an important seed character indicating how long the seed could maintain the viability. Accelerated aging with physical or chemical treatments are methods for detecting seed vigor especially storability (storability vigor, VDS). The aims of the research were: 1) to find out a simple accelerated aging method suitable for testing storability vigor of upland rice seeds, 2) to identify upland rice genotypes with high storability vigor. Experiments were conducted in the Seed Science and Technology Laboratory, Plant Analysis and Chromatography Laboratory, Soil Chemical Laboratory, Bogor Agricultural University, from January 2011 to October 2011. Three methods of accelerated aging, 45oC and 100% RH, 96% ethanol vapour, and soaking in 96% liquid ethanol, were applied to seeds of 5 rice varieties i.e. Situ Patenggang, Limboto, Inpago 4, Inpago 5, Inpago 6. The most suitable method was used to evaluate the storability vigor of 26 upland rice genotype seeds. Result of the experiment showed that accelerated aging by soaking seed in liquid ethanol 96% for 3 minutes and 24 seconds decreased the average germination percentage from 94.67% to 84.13% and seedling growth rate from 17.97%/etmal to 15.11%/etmal. However, biochemical analysis showed that there were no significant differences between the treated and untreated seed for electroconductivity, leakage of protein, sugar and phosphorous variables. The ethanol treatment might disturb fungtional proteins including enzymes but not the cell membrane. Evaluation of 26 upland rice genotypes showed that breeding lines B12154D-MR-10, B1215D-MR-11, and B11602-MR- 1-52 performed high storability 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