Judul: Induksi Proliferasi Tunas Adventif Kenaf (Hibiscus cannabinus L.) Secara In Vitro Melalui Penambahan Zat Pengatur Tumbuh 2.4-D Dan BAP
Abstrak: This research aimed to study the response of plant growth hormones 2.4-D and BAP to stimulate shoot proliferation initiation from three type of explants (meristem, meristem with cotyledon, and cotyledon) of kenaf. The research performed at Tissue Culture Research Laboratory, Agronomy and Horticulture Department, Agriculture Faculty, Bogor Agriculture University, from February to November 2010. Adventitious shoot formation on MS media supplemented with combinations of 2,4-D (0.0, 0.5, 1.0 mg/l) and BAP (0.0, 2.0, 4.0, 8.0, 10.0 mg/l). Callus began to appear in 2 weeks for all treatments on meristem and meristem with cotyledon. Results of this research showed that the medium composition without the 2.4-D + BAP had the highest number of adventitious shoots from meristem with cotyledon explants. Adventitious shoots formed after 11 weeks in culture without callus formation. The highest number of adventitious shoots resulted from the medium composition without 2.4-D +10.0 mg/l BAP. The medium composition without the 2.4-D +4.0 mg / l BAP resulted the highest number of roots from cotyledon explants. The roots of kenaf formed after 3 weeks which is marked by the emergence of roots from callus that formed on cotyledon explants.
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Judul: Induksi Pertumbuhan Mata Tunas Aksilar Aglaonema Pride Of Sumatera Secara In Vitro Melalui Penambahan Bap Dan 2,4-D
Abstrak: The research aimed to study the effect of plant growth regulator (BAP and 2,4-D) on the shoot bud growth of aglaonema Pride of Sumatera using axillary bud explant in vitro. This research was conducted from February 2010 to March 2011 at Laboratory of Plant Tissue Culture, Department of Agronomy and Horticulture IPB, Bogor. Completely Randomized Block Design was used in this research. The research consisted of two factors and three replications. The first factor is 2,4-D with two concentrations are 1 and 2 mg/l. The second factor is BAP with five concentrations are 2, 4, 6, 8, and 10 mg/l. The result showed that the treatment of BAP, 2,4-D, and the interaction between them are not significantly affected the number and the length of buds. The treatment of 6 mg/l BAP + 1 mg/l 2,4-D gave the fastest growth of shoot bud, that was 2.17 weeks. The optimal medium for axillary bud proliferation is 10 mg/l BAP + 2 mg/l 2,4-D, gave the highest number of bud (1 bud).
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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