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: Pengaruh Pengeringan, Media Pengujian, Waktu Panen dan Kondisi Ruang Simpan terhadap Viabilitas Serbuk Sari Mentimun (Cucumis sativus L.).
Abstrak: The objectives of this research were to study the decline of cucurbits pollen viability during desiccation, to determine the suitable germination medium for cucumber pollen, to determine the best time for pollen harvesting and to study thestorability of Cucumis sativus pollen. The study was carried out during March- August 2011 at Production Farm and Pollen Laboratory, PT East West Seed Indonesia in Jember, East Java. Viability of pollen harvested on the day of anthesis decreased after anther drying in air-conditioned room for 24 hours and decreased further after pollen drying in MgCl2 for 24 hours. Viability of pollen harvested one day before anthesis increased after anther drying in airconditioned room for 24 hours, then decreased after drying in MgCl2 for 24 hours. PGM 1, PGM 2 (modified from the original), Brewbacker and Kwack (BK), E1, and E2 were pollen germination medium used in this experiment. The male parental stock of KE010, KE014, KE018, and KE019 were used as the pollen source. The result showed that KE014 pollen germinated in PGM 1 had higher germination than BK, on the first trial. In the second trial, PGM 1 also showed higher germination than E2. Pollen of KE010, KE018, and KE019 germinated in PGM 2 produced higher germination than PGM 1 in in the third trial. The pollen harvesting was done at 07.00, 09.00, 11.00, 13.00, 15.00, 17.00 one day before anthesis and on the day of anthesis (A-1 and A) on KE010, KE018, KE019. The result showed that the best time for pollen harvesting for the three varieties was during 07.00-11.00 on the day of anthesis with viability at about 35%. The storage conditions under investigation for cucumber pollen were freezer, deep freezer, and ultra freezer. The most suitable storage condition for cucumber pollen (KE010, KE018, KE019) was ultra freezer, in which viability of cucumber pollen more than 1% would keep for 42 HSS (6 weeks), 90 HSS (12 weeks), 9 HSS (1.5 weeks) without any significant decline on germination.
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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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