Judul: Induksi Pertunasan In vitro pada Jaringan Pucuk Apikal Tanaman Kurma (Phoenix dactylifera L.) cv. Barhee
Abstrak: Date palm (Phoenix dactylifera L.) has the potential to be cultivated in Indonesia. Commercial cultivation of date palm requires large amounts of seed. Tissue culture techniques can be used as a solution to produce date palm seedling rapidly and efficiently. The purpose of this study was to determine the concentration of BAP (Benzyl Amino Purin) which may induce shoots on dates explant and determined the most effective method of sterilization of explants. The explant used was apical shoot (1- 2 cm) that was then quartered vertically. The first stage was to determine the effective method of sterilization of explants using three methods of sterilization. The second stage was the cultivation of explants on Murashige and Skoog media with five treatments of cytokinin BAP (0, 1, 2, 4, 6 mg/L). The results showed that MS medium with BAP in the concentrations ranged 0 to 6 mg/L had not been able to induce any new growth on the plant tissue of date palm cultivar Barhee. The sterilization method 3, which used 20% Bayclin, 10% Bayclin, 0.1% Agrept, 0.1% Dithane M-45, and 70% ethanol was better than the other sterilization methods.
Keyword: Bogor Agricultural University, tissue culture, shoot, Date palm

Judul: Induksi Embrio Globular pada Tanaman Aren (Arenga pinnata (Wurmb) Merr.)
Abstrak: Sugar palm is a monocot plant belong to the Arecaceae family economically valuable and have bright prospects to be developed for food products to bio-ethanol substituting fossil fuels. This plant is usually propagated generatively yet there are a few issues being faced such as a long reproductive cycle, long seed production and dormancy, low germination capacity, and uniform seedling growth. Non-conventional plant breeding through biotechnology is the best possible alternative solution to provide good quality seedlings in order to increase sugar palm productivity. Tissue culture through somatic embryogenesis method is a technique that can be used to induce abundant and relatively uniform somatic embryos from zygotic embryos. One of the key factors when using this method which is focused in this research is the role of plant growth regulators under the auxin, cytokinin, and gibberellin groups. The objective of this study was to get the best media to produce somatic embryos from zygotic embryos of sugar palm. The obtained results are expected to be used for future sugar palm non-conventional breeding. This research was conducted at Tissue Culture Laboratory Department of Agronomy and Horticulture, Faculty of Agriculture, Bogor Agricultural University from October 2012 to April 2013. It covers the embryogenic callus induction phase, globular embryo induction phase and globular embryos maturation phase. The first phase consisted six treatments with 2,4-D, NAA, and biotin combination aiming to induce callus formation from young zygotic embryos. In the second phase, callus obtained from the first phase were subcultured to 14 different treatments with various kinetin and TIBA combination. As for the third phase, explants which were obtained from the second phase were subcultured into media with or without GA3 combination. The variables which were observed were percentage and total sterile explants, percentage and total explants which induced callus formation, average percentage of callus coverage, percentage and total explants with base apocol smaller than haustorium, percentage and total pseudo roots, percentage and total explants which induced globular embryos, percentage and total alive and mature globular embryo clumps. Sterilization using NaOCl 1.575 % and alcohol 96 % was able to provide 50-85 % sterile explants. During callus induction phase, embryogenic callus were mostly formed at treatment A5 (MS + 3 mg l-1 2,4-D + 0.2 mg l-1 NAA + 100 mg l-1 biotin) which is 73.4 % after 8 weeks. All explants were able to form globular embryos on media B3 (callus A1 to media MS + 4 mg l-1 Kinetin), B6 (callus A1 to media MS + 1 mg l-1 Kinetin + 0.1 mg l-1 TIBA), B12 (callus A2 to media MS + 0.1 mg l-1 Kinetin + 1 mg l-1 TIBA), and B14 (callus A2 to media MS + 1 mg l-1 Kinetin + 1 mg l-1 TIBA) at 2 WAT during embryo globular induction phase. During embryo globular maturation phase, media C11 (globular embryo clumps B9 to media MS + 0.1 mg l-1 GA3) was able to induce 70.8 % mature globular embryo clumps.
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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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