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: 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: Metrik Einstein (Anti-) Self-Dual Berdimensi Empat dengan Metode Cartan
Abstrak: Gravitational field equation can be formulated in differential forms (differential geometry), which describes gravity as a manifestation of the curvature of space-time. Curvature of space-time is characterized by a metric that satisfies the gravitational field equation. With differential forms it can be formulated the (anti-) self-dual Einstein equation, which is a modification of the Cartan structure in (anti-) self-dual basis. Calculation of (anti-) self-dual metric with (anti-) self-dual Einstein equation is simpler than the calculation using Christoffel symbols.
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