Judul: Evaluasi toleransi beberapa galur/varietas kedelai (Glycine max (L.) Merr.) terhadap cekaman aluminium
Abstrak: Percobaan ini bertujuan untuk mempelajari penggunaan uji hayati akar pada fase kecambah sebagai metode evaluasi toleransi galur/varietas kedelai terhadap cekaman alumunium (Al) dan melakukan uji verifikasi daya adaptasi serta konsistensi toleransi suatu galur/varietas kedelai terhadap cekaman alumunium. Percobaan I merupakan percobaan lapangn yang dilakukan di Desa Guradog Lebak, pada bulan Januari 1998 sampai Juli 1999. Percobaan II merupakan uji hayati akar fase kecambah (root bioassay test), dilakukan di rumah kaca Pusat Antar Universitas (PAU) IPB Darmaga Bogor, pada bulan Januari 2000 sampai Mei 2000.
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Judul: Deteksi visual toleransi kedelai (Glycine max (L.) Merr.) terhadap aluminium melalui metode pewarnaan hematoxylin
Abstrak: Penelitian ini bertujuan untuk untuk menentukan. konsentrasi aluminium yang terbaik untuk seleksi galur/ varietas kedelai dan mengklasifikasikan galur/varietas kedelai toleransi Al. Penelitian dilakukan di laboratorium Biologi Molekuler PAU IPB pada bulan Maret sampai Juni 1995. Galur kedelai yang digunakan dalam penelitian ini berjumlah 28 galur yang terdiri dari Sindoro, Slamet, GH-07, GH-06, GH- 01, Sopeng I, Si Cinang, Genjah Jepang, Ti-73, Sriyono, Yellow Biloxi dan Singgalang adalah galur toleran, dan Remaga, Ti-79, Garut, AVRDC 1818, Mlg 2837, Mlg 3506, Mlg 3322, Lumut, Taitokauh, M.B.B, Mig 2644, Mlg 3300, Mlg 2508, Susu 224, Arksoy dan Glycine soja adalah galur sensitif Al. Galur-galur terpilih tersebut merupakan hasil seleksi di lapang dan di kultur air (Jusuf et al., 1994 dan Sopandie et al., 1994). Metode pewarnaan hematoxylin yang digunakan merupakan modifikasi Polle et al. (1978). Kedelai dikecambahkan selama 24 jam pada media air, kemudiaan kecambah ditumbuhkan pada media nutrisi tanpa aluminium dengan pH 4.0 selama 24 jam dan kemudian kecambah ditumbuhkan pada media nutrisi dengan perlakuan Al pada pH 4.0 selama 17 jam.
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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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