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: Kajian Tablet Aktinomiset Endofit terhadap Pengendalian Penyakit Hawar Daun Bakteri dan Peningkatan Pertumbuhan Tanaman Padi
Abstrak: Bacterial leaf blight (BLB) is an important disease in rice plants that cause production to decrease. Endophytic actinomycetes has been known to have an important role in enhancing rice plant’s growth. This research aimed to assess the capability of endophytic actinomycetes based product in controlling BLB disease, to improve rice plant’s growth, and to identify bacteria causing the BLB disease. Selected endophytic actinomycetes (AB131, AB131-2, and PS4-16) biomass were produced using modified molasses-soybeans medium and formulated into tablet. Biological product application was done by seed coating and soaking the roots of seedlings. Identification of bacteria causing the BLB disease was done using API iii 20 NE kit. Application of endophytic actinomycetes tablet at 200 g ha-1 in the field was able to increase plant height by 4% higher than control. Endophytic actinomycetes tablet could reduced BLB disease severity up to 74%. Based on morphological and biochemical characters, bacteria causing BLB disease which was isolated from the affected leaves in the field was indicated as Sphingomonas paucimobilis. Result of Koch's postulates test showed that S. paucimobilis produced similar symptoms with BLB disease in rice plant.
Keyword: bacterial leaf blight, biological product, endophytic actinomycetes, rice, Sphingomonas paucimobilis

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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