Judul: Pembiakan Streptomyces katrae pada Formulasi Beras dan Jagung serta Pengaruhnya Terhadap Daya Tumbuh Benih padi
Abstrak: Streptomyces have a potential to be growth promotion agent and biocontrol of plant disease. The limitation for wide use at the farmer level is the problem of mass production. The objective of this study was to evaluate the rice and corn formulation as media for mass production of Streptomyces katrae and the effect of its application on rice seed growth. Both of rice and corn formulation was inoculated with isolates of S. katrae and incubated until 20 days. Seed coating is application to see effect of S. katrae on rice seed growth. Three days after its inoculation, mycelial had grown on all formulation. Fifteen days after incubation, the higher population S. katrae is FB2 (90% rice + 10% mushroom baglog waste) and FJ2 (90% corn + 10% mushroom baglog waste) with total population 124.8 x 107 cfu and 107.6 x 107 cfu. The effect of S. katrae had seen influence at ten days after rice seed planting on compos sterile, with root length, bud length and reduction of population X. oryzae pv. oryzae, but not influence with germination. Both rice and corn formulation can be an alternative substrate for low cost mass production of S. katrae inoculum.
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Judul: Pengaruh Formulasi Kasar dan Halus untuk Pembiakan Streptomyces katrae terhadap Penghambatan Populasi Xanthomonas oryzae pv. oryzae serta Daya Tumbuh Benih Padi
Abstrak: Streptomyces katrae is bacteria that included in the actinomycetes. The ability of actinomycetes is producing antibiotics that can suppress the development of disease in plants. Growing S. katrae using organic wastes often to minimize production costs. The objective of this study is to get an effective formulation for growing S. katrae to Xanhomonas oryzae pv. oryzae and rice seed growth. S. katrae cultured in 8 formulations, rice + rough waste of mushroom baglog (B1L1); rice + smooth waste of mushroom baglog (B1L2); rice flour + rough waste of mushroom baglog (B2L1); rice flour + smooth waste of mushroom baglog (B2L2); corn + rough waste of mushroom baglog (J1L1); corn + smooth waste of mushroom baglog (J1L2); cornmeal + rough waste of mushroom baglog (J2L1); cornmeal + smooth waste of mushroom baglog (J2L2). Results showed a population S. katrae was highest in the treatment of B1L1 is 102.83x104 cfu/ml and B1L2 is 46.58x104 cfu/ml. This is because the nutrients found in the rice helps the grow of bacteria compared with corn. Rice seed treated with a seed coating B1L1 and B1L2 formulation also has a high shoots better than the control treatment. Germination with seed coating treatment B1L1 and B1L2 percentage of 90% and amounted to 93.3%. Provision of actinomycetes in rice seed can also suppress populations of Xanthomonas oryzae pv. oryzae causes kresek disease.
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Judul: Cycle Hamilton pada Graf Lengkap, Graf Regular, dan Graf 2-Connected 4-Regular Berorder Kurang dari Sepuluh
Abstrak: Suatu graf disebut graf Hamilton apabila graf tersebut memuat cycle Hamilton, yaitu cycle yang melewati setiap vertex tepat satu kali. Menentukan keberadaan cycle Hamilton pada suatu graf dapat menggunakan syarat cukup yang berupa teorema-teorema yang telah diperkenalkan sejak tahun 1950-an. Beberapa syarat cukup yang dibahas dalam karya ilmiah ini adalah syarat cukup yang berhubungan dengan graf lengkap dan graf regular. Suatu graf lengkap berorder 𝑛������ ≥ 3 dan graf r-regular berorder 𝑛������ ≤ 2𝑟������ + 1 merupakan graf Hamilton, Karena kedua graf tersebut memuat cycle Hamilton. Selanjutnya, syarat cukup tersebut digunakan untuk menentukan keberadaan cycle Hamilton pada graf 2-connected 4- regular berorder kurang dari 10.
Keyword: graf Hamilton, graf regular, graf lengkap, graf 2-connected 4-regular