Judul: Kemampuan Benih Kedelai (Glycine max L.) untuk Mempertahankan Viabilitasnya setelah Didera dengan Etanol
Abstrak: Seed lots with different viability levels, 60–80%, are needed for seed invigoration studies to improve seed vigor and crop yield. Laboratory experiments were conducted to determine an accelerated aging method with liquid ethanol (96%) producing the desirable seed-viability levels and the storability of the treated seeds on soybean (Glycine max L.). The experiments were conducted in the Seed Science and Technology Laboratory, Bogor Agricultural University from November 2012 to May 2013. Soybean seeds of varieties Gema, Burangrang, and Ijen were treated by different duration of soaking into 96% liquid ethanol. Viability of the treated seeds were tested with UKD-dp method. The seeds with desirable viability levels P20 and P40 , were stored in two storage conditions, 27–30°C with 61–72% RH and 22–27°C with 58–74% RH. The results indicated that soybean seed of varieties Gema, Burangrang, and Ijen, with viability level of 80% (P20 ) could be obtain by soaking the seed into ethanol 96% for 22 minutes 31.8 secons, 22 minutes 58.8 secons, 15 hours 19.8 minutes respectively, whereas those with viability level of 60% (P40 )were obtained by soaking durations of 99 minutes 27.6 secons, 109 minutes 34.2 secons, 40 hours 4.8 minutes, respectively. The seed with selected viability levels, (P20 ) and (P40 ), could maintain the viability for 8 weeks in the both storage conditions.
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Judul: Daya Simpan Benih Mentimun (Cucumis sativus L.) yang Telah Diusangkan dengan Perlakuan Etanol
Abstrak: Seed lots with different viability levels were needed in seed invigoration. The objectives of this research were to find out the method of Chemical Accelerated aging that could produce the desirable cucumber seed lot with 80% and 60% germination percentage, and the storability of the treated seeds. Seeds of three cucumber varieties (Misano, Monza, and Penus) were treated by different soaking duration in liquid ethanol 96% to produce 80% and 60% viabilitiy levels and then storedin ambient room (25-30 ºC and RH 57-75%) and AC room (20-28 ºC and RH 45-74%). Cucumber seed of varieties Monza, Misano, dan Penus with viability level of 80% (VL1) could be obtain by soaking the seed into ethanol liquid 96% for 80 minutes, 10 hours 48 minutes, and 4 hours, whereas those with viability level of 60% (VL2) were obtained by soaking duration of 170 minutes, 14 hours 44 minutes and 7 hours. Storage experiment showed that in ambient condition both viability level of Monza seed could maintained the viability for 4 weeks, Misano seed 2 weeks, whereas Penus seed 8 weeks. In AC condition Misano and Penus seed could maintained the viability for 8 weeks, whereas Monza seed 6 weeks.
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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