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: Non-Pathogenic Phyllosphere Bacteria Producing Bioactive Compounds as Biological Control Agent of Xanthomonas oryzae pv. oryzae
Abstrak: Xanthomonas oryzae pv. oryzae (Xoo) merupakan penyebab penyakit Hawar Daun Bakteri (HDB) pada tanaman padi. Bakteri patogen ini menginfeksi tanaman melalui luka atau lubang alami pada daun. Kerusakan terberat terjadi ketika patogen menyerang tanaman rentan sehingga menimbulkan gejala kresek dan hawar daun yang menyebabkan kematian padi. Penggunaan pestisida dan bahan-bahan kimia berbahaya pada saat ini mulai ditinggalkan karena tidak ramah terhadap lingkungan. Perkembangan bioteknologi telah mendorong berkembangnya penelitian tentang penggunaan mikroorganisme sebagai agen biokontrol. Pemanfaatan bakteri filosfer padi sebagai agen biokontrol merupakan salah satu strategi alternatif untuk mengendalikan Xoo. Penelitian ini bertujuan untuk mencari potensi bakteri filosfer padi yang memiliki kemampuan antagonis terhadap Xoo dan bersifat non-patogenik terhadap tanaman, serta mempelajari kemampuan penghambatan isolat potensial tersebut terhadap bakteri Xoo, penyebab penyakit hawar daun bakteri pada tanaman padi, di rumah kaca., Xanthomonas oryzae pv. oryzae (Xoo) is a causative agent of bacterial leaf blight (BLB) disease in rice plant. These pathogenic bacteria infect the plants through wounds or natural openings on the leaves. The severest damage occurs when the pathogens invade susceptible plants which cause blight symptoms and affect to the death of the rice. The use of pesticides and chemicals that are harmful for environment are reduced nowadays. The development of biotechnology has pushed the research focus on the use of microorganisms as a bio-control agent. Utilization of rice phylosphere bacteria as bio-control agent is one alternative strategy for controlling Xoo. This study aimed to explore the potencies of phyllosphere bacteria as antagonistic agent to Xoo which non-pathogenic to plants, and study the inhibitory potencies of isolates to Xoo causing bacterial leaf blight in rice plants in greenhouse condition
Keyword: phyllosphere bacteria, bioactive compound, Xoo, biocontrol agent

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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