Judul: Penggunaan nilai delta dan nilai rasio viabilitas untuk menduga daya konservasi pratanam benih kedelai (Glycine max L. Merr.)
Abstrak: Daya konservasi benih 10 varietas kedelai berbeda-beda, begitu juga ketahanannya terhadap deraan uap etanol. Tolok ukur memiliki kepekaan yang berbeda dalam mendeteksi daya konservasi benih kedelai. Daya konservasi dugaan benih kedelai dapat diketahui dengan mengukur viabilitas potensial (Vp) atau vigor (Vg) dari suatu lot benih dengan peubah-peubah hitungan total (HT), hitungan pertama (HP), normal total (NT) dan normal kuat (NK). Lalu dengan menggunakan persamaan-persamaan yang sesuai daya konservasi dugaan (DKd) suatu lot benih kedelai dapat diketahui. Kemunduran benih secara buatan memiliki kesamaan dengan kemunduran benih secara alami selama konservasi, sehingga daya konservasi dugaan dapat juga diketahui dengan menghitung nilai ketahanannya terhadap deraan uap etanol dengan menggunakan nilai kesetaraan antara lama deraan dan lama konservasi.
Keyword: Seed treatment

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.
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