Judul: Produksi antibodi poliklonal untuk deteksi bakteri layu (Pseudomonas solanaceaum) dari kentang
Abstrak: Penelitian ini bertujuan untuk mendapatkan antibodi poliklonal yang dapat digunakan untuk mendeteksi bakteri layu dari kentang, untuk mengetahui titer antibodi yang terbentuk dari preparat antigen yang berbeda serta cara pengujian yang berbeda dan untuk mengetahui spesifisitas antibodi. Penelitian dilaksanakan di Laboratorium Bakteriologi Tumbuhan dan di rumah kaca Jurusan Hama dan Penyakit Tumbuhan Fakultas Pertanian Institut Pertanian Begor, Laboratorium Biologi dan Kimia Terpadu FMIPA IPB dan di Laboratorium Immunologi Fakultas Kedokteran Hewan IPB. Penelitian dilaksanakan pada bulan Mei 1993 sampai Januari 1994. Penelitian dilakukan melalui tiga tahap percobaan yaitu: (1) uji postulat Koch yang meliputi isolasi patogen, identifikasi patogen, inokulasi patogen dan reisolasi patogen, (2) pembuatan preparat antigen dan (3) produksi antibodi poliklonal. ...
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Judul: Beberapa aspek penularan bakteri layu (pseudomonas solanacearum E. F. Smith) melalui umbi kentang dan kemungkinan penanggulannya
Abstrak: Deteksi jumlah bibit kentang yang terinfeksi bakteri layu dilakukan dengan cara mengisolasi patogen dari sampel bibit yang diambil dari beberapa sentra produksi kentang di Jawa Barat, Jawa Tengah, dan Jawa Timur. Dari hasil penelitian diketahui bahwa intensitas serangan Bakteri layu pada pertanaman kentang tercatat sebesar 17, 3 persen (kisaran 15,56 _sampai 16,75 persen) dan jumlah bibit yang terinfeksi patogen tersebut berkisar dari 5,58 sampai 6,68 persen. Umbi bibit ini merupakan sumber utama inokulum bakteri layu pada daerah yang belum terinfeksi. Semakin tinggi persentase bibit sakit semakin banyak bagian pertanaman kentang yang terkena serangan bakteri layu. Deteksi bakteri layu dari bibit kentang dilakukan dengan melihat gejala dalam umbi bibit, isolasit bioasai dan inkubasi bibit. Cara-cara ini sangat efektif untuk mendeteksi bakteri layu pada umbi bibit. Hasil deteksi tertinggi sampai terendah berturut-turut diperoleh dengan cara isolasi (38,44 - 51,55 persen), melihat gejala dalam umbi bibit (17,78 persen), bioasai (12,22 persen), dan inkubasi bibit (3,37 persen).
Keyword: Field crops;, Incubation tubers;, Bioassay;, Bakterisida;, Bogor Agricultural University;

Judul: Thermal Characteristics and Dynamics of Tropical Cyclone over Western North Pacific Ocean: A Case Study of Typhoon Songda (Chedeng) 2011
Abstrak: The frequent occasion of Tropical Cyclone (TC) over Western North Pacific (WNP) Ocean lies from 10˚N to 26˚N and 121˚E to 170˚E. Sources of TC development come from warm ocean temperature where latent heat is released during condensation processes and subsequently concentrated in the boundary layer. Relative humidity at 850-700 hPa is responsible to produce the most intense storm. Meanwhile, weak vertical wind shear between 850-200 hPa is one of the dynamical factors that lead to the development of TC. Pressure level of 850-200 hPa is chosen to minimize the thermodynamic effect in the lower troposphere. Typhoon Songda (Chedeng in the Philippines) or TSC lasted from May 18th to 30th, 2011 and strengthened into powerful Super Typhoon stage between May 24th and 27th. Long curving track and the exhibition of all sequences of TC life cycle, TSC is then considered as an ideal case of TC. The objective of the study with case of TSC is to investigate the role of thermal characteristics and dynamics on TC intensity. The research is carried out by using Advanced Research of Weather Research and Forecasting model (WRF ARW model) version 3.3. Two domains are employed in the model. The first domain situate from 02˚N to 40˚N and 118˚E to 149˚E and cover spatial resolution () of 33.1 km. The second domain situate from 09˚N to 27˚N and 119˚E to 132˚E with of 11 km. Timestep of the model () is 120 seconds. The model is supported by the following physical parameterization, i.e., Yonsei University Scheme (YSU) in the boundary layer, Kain-Fritsch scheme (KF) in the cumulus, and WRF Single-Moment 3-class scheme in the microphysics. Initial meteorological condition prior to the formation of the cyclone is generated using WRF ARW standard-release model. Sensitivity of the model output is obtained from a selected single-parameter change scenarios, namely, 10 % to 20 % decrease and increase of wind shear initial data at 850-200 hPa, and by 10 % to 20 % decrease of relative humidity initial data at 850-700 hPa. The result showed that the negative correlations between wind shear and intensity are found in wind shear scenarios. Wind shears of 10 ms-1 which lead to strengthening of the wind intensity in the early period of Typhoon development are found in wind shear scenarios. The effect of wind shear changes on wind intensity is statistically significant in the 20 % wind shear scenarios. During mature stage, weak wind intensity occurred when wind shear increase as given in the WRF standard-release and the 20 % decreasing scenario. Different situation is found in the 20 % increasing scenario where wind shear tend to weak and lead to strong wind intensity at this stage. Meanwhile, the reduction of moisture supply at 850-700 hPa resulting from 20 % decreasing relative humidity play a major role in the weakening of wind intensity and reduces mechanical energy of the cycle process as much as 300 J kg-1.
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