Judul: in vitro callus and shoot induction of “mahkota dewa” by manipulation of plant growth regulators and explant
Abstrak: The objective of this research was to study the effects of auxin and cytokinin in in vitro callus and shoot induction of “mahkota dewa” (Phaleria macrocarpa). Three experiments used Complete Randomized Design for shoot induction (experiment I) and callus induction (experiment II and III). Shoot induction experiment consisted of 16 combinations of BA (0.0, 2.5, 5.0, and 7.5 mg/l) and NAA (0.0, 0.5, 1.0, and 1.5 mg/l) using MS basal medium and seed as explant. The callus induction experiment consisted of MS basal medium with nine combinations of 2,4-D (2.5, 5.0, and 10.0 mg/l) and BA (0.0, 0.5, and 1.0 mg/l) and six combinations of NAA (20.0 and 40.0 mg/l) and BA (0.0, 0.5, and 1.0 mg/l). Experiment II and III using leaf and seed as explants in separated experiment. within MS medium. The result of experiment I showed that shoots can be produced in MS basal medium with combinations BA and NAA. The best combination of auxin and cytokinin for shoot induction was BA 2.5 mg/l. For callus induction using leaf explants was 2,4-D 2.5 mg/l + BA 0.5 mg/l and 20.0 mg/l NAA without BA, and for seed explants was 2,4 -D 10.0 mg/l + BA 5.0 mg/l and NAA 20.0 mg/l + BA 0.5 mg/l but it is not significantly with NAA 20.0 mg/l + BA 1.0 mg/l.
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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: Konstruksi Persamaan Friedmann Alam Semesta Friedmann-Lemaitre-Robertson-Walker Termodifikasi Materi Gelap Superfluida
Abstrak: Kosmologi merupakan salah satu objek kajian dari teori relativitas umum. Salah satu model dalam kosmologi adalah model kosmologi Friedmann. Model kosmologi Friedmann dibangun berdasarkan asumsi bahwa materi dan energi terdistribusi secara homogen dan isotropik di alam semesta. Teori relativitas umum dapat dimodifikasi melalui pendekatan teori materi gelap superfluida (MGS). Persamaan medan Einstein untuk teori MGS dapat dirumuskan melalui prinsip aksi dengan memodifikasi Lagrangian pada aksi teori MGS. Selanjutnya dengan memilih metrik Friedmann-Lemaitre-Robertson-Walker (FLRW) datar dengan indeks kurvatur sama dengan nol, dapat dibangun suatu bentuk persamaan Friedmann yang dimodifikasi teori MGS.
Keyword: kosmologi, teori materi gelap superfluida, persamaan medan Einstein, metrik FLRW, persamaan Friedmann.