Judul: Uji Viabilitas Formulasi Bakteri A8 sebagai Agens Hayati dan Aplikasinya pada Tanaman Padi
Abstrak: Penurunan produksi padi yang utama terjadi di Indonesia dilaporkan antara lain disebabkan oleh penyakit blas oleh cendawan Pyricularia oryzae (PO), hawar pelepah daun oleh Rhizoctonia solani (RS), dan hawar daun bakteri oleh bakteri patogen Xanthomonas oryzae pv. oryzae (Xoo). Beberapa bakteri dapat digunakan sebagai agens hayati dalam menekan gejala penyakit pada tanaman. Penelitian ini bertujuan mengetahui viabilitas formulasi A8 sebagai agens hayati dan menguji aplikasi keefektifannya dalam mengendalikan penyakit blas, hawar pelepah daun (HPD), dan hawar daun bakteri (HDB) pada tanaman padi Inpari 13 sesudah masa penyimpanan satu bulan formulasi. Viabilitas konsorsium A8 dalam media pembawa talk cenderung stabil dari bulan ke-0 sampai ke-2. Berdasarkan uji in vivo, pemberian formulasi A8 pada padi Inpari 13 secara preventif dapat menekan pertumbuhan penyakit blas, HDB, dan HPD. Intensitas penghambatan formulasi A8 paling besar didapatkan terhadap penyakit blas yaitu sebesar 75.957%. Kata kunci: blas, formulasi A8, hawar daun bakteri, hawar pelepah daun
Keyword: sheath blight, lation, A8 bacterial formubacterial leaf blight, blast

Judul: Uji Viabilitas Formula Biofilm A8 dan Pengujian pada Penyakit Blas Padi
Abstrak: Blast disease caused by Pyricularia oryzae is a serious rice disease causing yield lost. This study aims to study the viability test of the bacterial consortium biofilm carrier by in vitro and in vivo. The method was performed, by antagonist test, viability, in vivo test on consortium of the A8 and A8 formula treatment using Plastic Refigerator’s Temperature (SKP), Alumunium foil’s Refigeratore’s Temperature (SKA), Plastic Room Termperature (SRP), and Alumunium foil’s Room Temperature (SRA) against Pyricularia oryzae. The results of SKP treatment showed the best inhibition percentage of 63%. Viability test of A8 formula biofilm was carried out during three months of storage. The results showed a decline in log cells at third month, except the SRP treatment. The best in vivo test results was obtained by SRA treatment as a percentage inhibition of 58.89% and 44.89% after 10 and 14 day after inoculation (dai).
Keyword: Bogor Agricultural University (IPB), blast disease, Pyricularia oryzae, biocontrol, bacterial consortium A8, Biofilms

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