Judul: Viability and Efectivity Test of Biori to Control Xanthomonas oryzae pv. oryzae.
Abstrak: Penyakit hawar daun bakteri (HDB) disebabkan oleh bakteri patogen Xanthomonas oryzae pv. oryzae (Xoo) merupakan salah satu penyakit tanaman padi yang dapat menurunkan produktivitas padi. Biori merupakan salah satu produk agens hayati yang ramah lingkungan untuk mengendalikan penyakit patogen pada tanaman padi. Tujuan penelitian ini untuk mengetahui efektivitas konsorsium bakteri pada produk Biori yang disimpan pada suhu ruang dan suhu kulkas sebagai agens pengendali hayati hawar daun bakteri pada tanaman padi di rumah kaca. Metode yang digunakan, yaitu : peremajaan bakteri uji, uji viabilitas bakteri dalam Biori menggunakan metode Total Plate Count, uji antagonisme Biori terhadap Xoo menggunakan metode double layer, dan uji in vivo produk Biori terhadap Xoo pada tanaman padi di rumah kaca. Uji viabilitas Biori mengalami penurunan sebesar 66.47%. Uji antagonisme menunjukkan adanya penghambatan terhadap Xoo sebesar 29.76%. Aplikasi Biori yang dilakukan secara preventif pada padi varietas Inpari 18 dapat menghambat pertumbuhan Xoo sebesar 31.16%
Keyword: Bogor Agricultural University, Institut Pertanian Bogor, IPB, Leaf blight disease, Xanthomonas oryzae pv. oryzae, Biori, Double layer, Bacterial, Hawar daun, Perremajaan bakteri uji/produk biori

Judul: Penapisan Bakteri Filosfer Penghasil Senyawa Bioaktif Anti Xanthomonas oryzae pv. oryzae Penyebab Penyakit Hawar Daun Bakteri pada Padi
Abstrak: Bacterial leaf blight (BLB) caused by Xanthomonas oryzae pv. oryzae (Xoo) is one of the important diseases in rice crops. The disease is difficult to control because it attacks the rice plant at different growth stages ranging tillering, flowering and ripening. One alternative that can be used to control the spread of BLB is using the biocontrol agent which can be obtained from phyllosphere. This study aims to isolate, characterize and screen the rice phyllosphere bacteria producing bioactive compounds anti Xoo causes BLB in rice. Phyllosphere bacteria isolated from rice leaves Ciherang healthy age of 2.5 months using 4 different media obtained 285 bacterial isolates, the 65 isolates of King’s B agar, 86 isolates of nutrient agar, 81 isolates of Luria-Bertani agar, and 53 isolates of trypticase soy agar. Antagonist test using double layer method showed 58 isolates phyllosphere bacteria potential as a biocontrol agent producing bioactive compounds Xoo. Pathogenicity test showed 18 isolates not potentially pathogenic to rice plants. Among the 18 non-phytopathogenic isolates, 14 isolates including Gram-positive bacteria, 4 isolates Gram-negative bacteria, and 5 isolates of Bacillus suspected. Three of the 18 isolates (BFSGb 8, BFSGb 55, and BFSGb 99) has the largest index value inhibition of in-vitro against Xoo is 1.33, 1.67, and 1.33 respectively to isolate BFSGb 8, BFSGb 55, and BFSGb 99.
Keyword: Bogor Agricultural University (IPB), Xanthomonas oryzae pv. oryzae., phyllosphere bacteria, bioactive compounds, Bacterial leaf blight

Judul: Konstruksi Hukum Grup Kurva Eliptik Atas F3m
Abstrak: Elliptic curves upon F3m can be divided in two cases, i.e. supersingular and nonsupersingular case. Based on group laws on elliptic curves, a new arithmetic upon F3m can be formulated as an addition process of two random points on the curve. This addition process can then be applied to the ElGamal algorithm.
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