Judul: ABSTRACT ANGGIANING TYAS RAHAYU. Formulation of Biological Product Based on Endophytic Actinomycetes as Growth Promotor of Rice Plant
Abstrak: Produk hayati mengandung mikrob hidup dan dapat memacu pertumbuhan tanaman dengan cara meningkatkan ketersediaan nutrisi pada tanaman. Aktinomiset endofit hidup di dalam jaringan tanaman tanpa membahayakan inangnya. Penelitian ini bertujuan untuk memformulasi produk hayati berbasis aktinomiset endofit dan menguji viabilitasnya pada kondisi penyimpanan berbeda, serta menguji efektivitasnya sebagai pemacu pertumbuhan tanaman padi. Produk hayati yang dihasilkan berupa tablet dan manik-manik alginat yang mengandung konsorsium isolat aktinomiset endofit PS4-16, AB131-2, dan AB131-1. Hasil uji viabilitas aktinomiset endofit pada produk hayati selama 12 minggu penyimpanan menunjukkan bahwa produk tablet yang disimpan pada suhu 4°C memiliki viabilitas bakteri yang lebih baik dibandingkan dengan penyimpanan pada suhu ruang, sedangkan produk manik-manik alginat memiliki viabilitas bakteri yang stabil selama penyimpanan, baik pada suhu ruang maupun suhu 4°C. Pengujian kemampuan produk dilakukan di rumah kaca menggunakan padi varietas IR-64 dengan rancangan acak lengkap, 3 ulangan dan 7 perlakuan, yaitu P0 (tanpa pemupukan sebagai kontrol negatif); Pk (1 dosis NPK sebagai kontrol positif); P1 (1 dosis NPK dengan produk hayati); P2 (0.75 dosis NPK dengan produk hayati); P3 (0.5 dosis NPK dengan produk hayati); P4 (0.25 dosis NPK dengan produk hayati); dan P5 (produk hayati). Perlakuan P4 mampu meningkatkan hasil rata-rata bobot kering tajuk (18.41 gram), bobot kering akar (11.47 gram), serta bobot kering total tanaman (29.88 gram) melebihi aplikasi perlakuan P0 dan Pk. Produk hayati berbasis aktinomiset endofit mampu meningkatkan pertumbuhan tanaman padi.
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Judul: Kemampuan aktinomiset endofit dalam meningkatkan pertumbuhan tanaman padi (Oryza sativa L.) melalui aktivitas asam Indol Asetat
Abstrak: Actinomycetes endophyte lives in plant tissue and may be able to produce various bioactive compounds. The bioactive compound produced by Actinomycetes endophyte can be useful to enhance the growth of plant through the activity of phytohormones substances produced, i.e. indole Acetic Acid (IAA). In vitro production of IAA from the ten isolates that were grown in ISP 2 liquid medium with the addition of 0.2 ml L-tryptophan 0.2% showed various concentration ranging about 11-99 ppm. Isolates producing high IAA were AB131-1 (99.2 ppm), AB131-2 (99,2 ppm), and PS4-16 (93.4 ppm). Those three superior isolates were then inoculated into rice seedlings which were then grown in pouches. Inoculation were designed in 20 different treatments, i.e. negative control, positive control (IAA 0.01, 0.1 dan 1 ppm), media control of ISP 2 liquid medium and supernatant of the three isolates in various concentrations. AB131-1 (1.05 ppm IAA) was considered as the most potential isolate based on its capability to increase plant height (26%), root length (33.4%) and dry weight (206%) more than the influence of IAA sintetic of 0.1 ppm addition. Microscopic observation of AB131-1 and PS4-16 of rice treatment using root coloring and Scanning Electron Micrographs (SEM) method showed that both of isolate were able to penetrate to the root of rice. The data showed that the application of Actinomycetes endophytic can increase the growth of rice plant.
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Judul: Construction of Strongly Optimal Binary Linear Code with Minimum Distance 9 and 11
Abstrak: A binary linear code of length n over q F is a subspace of n q F . A code has three parameters that attached to it, namely length, dimension, and minimum distance. A code with length n, dimension k and minimum distance d is often called [n, k, d ]-code. Usually, when two parameters are given, then we want to find a code that has the best value for the last parameter. Based on Gilbert- Varshamov bound, if a [n, k, d ]-code exists and can not be expanded, we call it a strongly optimal code. In this paper, we construct strongly optimal code with minimum distance 9 and 11. In constructing the code, we created a theorem and algorithm based on Gilbert-Varshamov bound before we implement the algorithm to MAPLE programming language. Because of computational limitations, the program can only construct up to k = 10 for d = 9 and k = 12 for d = 11.
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