Judul: Aplikasi poliamin pada kultur anter padi silangan resiprokal jatiluhur x Grogol untuk meningkatkan produksi kalus dan regenerasi tanaman hijau
Abstrak: Kultur anter merupakan salah satu metode yang dapat mempercepat waktu untuk mendapatkan galur yang homozigos. Persilangan dan media merupakan faktor yang penting dalam kultur anter. Masalah yang dihadapi pada kultur anter adalah sedikitnya tanaman hijau dan banyaknya tanaman albino. Modifikasi media dengan penambahan poliamin diharapkan daapt meningkatkan produksi kalus dan regenerasi tanaman hijau. Tujuan penelitian ini adalah untuk mengetahui pengaruh poliamin pada berbagai tahap kultur anter pada hasil persilangan terhadap pembentukan kalus dan regenerasi tanaman hijau.
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Judul: Pengaruh Poliamin terhadap Induksi Kalus dan Regenerasi Tanaman Hijau pada Kultur Antera Padi (Oryza sativa L.) ev. Taipei 309
Abstrak: Penelitian bertujuan untuk mengetahui pengaruh putresin, spermidin dan spermin pada tahap induksi kalus terhadap induksi kalus dan regenerasi tanaman hijau dan mengetahui pengaruh spermin yang diberikan pada tahap kttltur yang berbeda terhadap induksi kalus dan regenerasi tanaman hijau pada kultur antera padi. Penelitian dilakukan di Laboratorium Kultur Jaringan, Balai Penelitian Bioteknologi Tanaman Pangan, Pusat penelitian dan Pengembangan Tanaman Pangan, Bogor. Penelitian dimulai bulan Februari 1998 satnpai bulan Oktober 1998. Bahan yang digtmakan adalah antera tanaman padi varietas Taipei 309, NAA, Kinetin datt IBA. Poliamin yang digunakan adalah putresin.2 HC1, spertnidin.3 HCI dan spermin.4 MCI dengan konsentrasi M. Media yang digunakan adalah media N6 dan media MS. Alat yang digunakan adalah Laminar Air Flow Cabinet, alat-alat kultur jaringan, cawan petri, tabung kultur, pinset bayonet dan autoclave.
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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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