Judul: Studi morfologi dan anatomi guna mempelajari perubahan genetik kedelai varietas orba dan wilis akibat perlakuan colchicine
Abstrak: Hibridisasi suatu species merupakan salah kegiatan utama dalam setiap program satu pemuliaan. Hibridisasi antar antar species sering menghasilkan sterilitas hibrid. Penggandaan jumlah kromosom (poliploidisasi) merupakan suatu cara untuk menghilangkan sterilitas. Usaha pengaandaan jumlah kromosom pada kedelai terbudidaya (Glycine max) varietas Orba dan Wilis telah dilakukan dan dihasilkan 7 mutan (6 mutan varietas Drba dan 1 mutan berasal varietas Wilis). berasal Guna keperluan tersebut di atas, maka perlu dilakukan pengamatan secara mendasar terhadap morfologi dan anatomi dari ke 7 mutan tersebut. Hasil pengamatan morfologi (sifat kualitatif dan kuantitatif) dan anatomi serta hasil pengolahan data dengan metode Analisis Gerombol dan Analisis Diskriminan memunculkan tiga kelompok yaitu: kelompok I terdiri tanaman asalnya Orba dan Wilis sebagai kontrol; kelompok II terdiri dari 0/0.5/1, 0/0.5/5 dan W/0.3/1 yang diduga. mengalami perubahan ke arah poliploidisasi dengan ciri penting umur berbunga dan umur matang lebih dalam, periode berbunga lebih lama, warna bunga ungu tua, warna daun hijau tua, jumlah polong dan biji berkurang, peningkatan jumlah kloroplas, ukuran stoma dan berkurangnya kerapatan stoma serta jaringan-jaringan sel yang bertambah besar; dan kelompok III terdiri dari 0/0.5/2, 0/0.5/3, 0/0.5/4 dan 0/0.5/6 yang diduga mengalami perubahan kearah perubahan mutasi gen biasa dengan ciri penting jumlah polong dan biji banyak.
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Judul: Studi sitologi pada kedelai keturunan tanaman autotetraploid hasil perlakuan kolkisin
Abstrak: Penelitian bertujuan untuk mengetahui perubahan jumlah kromosom, ukuran sel, dan fertilitas polen keturunan kedelai varietas Orba dan Wilis hasil perlakuan kolkisin. Kedelai tersebut merupakan koleksi Laborato- rium Genetika, Jurusan Biologi, IPB. Penelitian dilaksanakan dari bulan Juni sampai bulan Oktober 1990, di Kebun Percobaan IPB Tajur, dan Laboratorium Genetika, Jurusan Biologi, IPB, Bogor.
Keyword: kedelai

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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