Judul: Pengaruh kombinasi dua taraf BAP dengan L-Glutamin atau ekstrak malt terhadap organogenesis in vitro eksplan daun melinjo
Abstrak: Percobaan yang dilakukan di Laboratorium Bioteknologi Kultur Jaringan PUSLITBANGTRI Cimanggu Bogor pada bulan. April hingga September 1994 ini bertujuan untuk mempela- jari pengaruh BAP dengan L-glutamin atau ekstrak malt ter- hadap regenerasi eksplan potongan jaringan daun melinjo. Desain percobaan menggunakan Rancangan Acak Kelompok dengan 6 macam perlakuan hasil kombinasi dua taraf BAP (3 dan 5 mg/l) dengan 750 mg/1 L-glutamin atau 500 mg/1 ekstrak malt. Peubah yang diamati meliputi waktu inisiasi bakal tu- nas dan tunas, tinggi tunas, jumlah tunas per eksplan, serta jumlah buku dan daun per tunas. Hasil pengamatan menunjukkan bahwa penambahan ekstrak malt maupun L-glutamin ke dalam media MS yang telah di- lengkapi BAP dan NAA berpengaruh sangat nyata terhadap pe- ubah-peubah yang diamati. Penambahan kedua zat tersebut cenderung memperlambat waktu inisiasi bakal tunas dan ke- matian kultur (gugurnya daun dan tunas yang telah terben- tuk), meningkatkan jumlah bakal tunas maupun tunas dan me- macu proses pertumbuhan tunas (meningkatkan tinggi tunas)…..
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Judul: Pengaruh kombinasi Benzyl Amino Purine (BAP) dan N6 - (2-Isopentyl) Adenin (2-ip) terhadap multiplikasi tunas pisang ambon kuning (Musa acuminata L. AAA Group) melalui kultur in vitro
Abstrak: Tujuan penelitian ini adalah untuk mengetahui penga- ruh kombinasi 2 macam sitokinin (BAP dan 2-iP) terhadap multiplikasi dan pertumbuhan tunas pisang Ambon Kuning se- hingga diperoleh bibit yang baik. Penelitian ini dilaku- kan di laboratorium kultur jaringan, Jurusan Budi Daya Pertanian, Fakultas Pertanian IPB sejak bulan Maret hingga Agustus 1994. Eksplan yang digunakan adalah pucuk steril hasil per- banyakan sebelumnya pada media MS + BAP 5 mg/1. Percobaan dilakukan dengan menggunakan Rancangan Acak Lengkap ter- diri dari 8 faktor tunggal sebagai perlakuan yaitu BAP 5 mg/1 (B5), 2-1P 5 mg/1 (P5), BAP 10 mg/1 (B10), 2-1P 10 mg/1 (P10), BAP 2.5 mg/1 + 2-iP 2.5 mg/1 (B2.5P2.5), BAP 5 mg/1 + 2-iP 5 mg/l (B5P5), BAP 4 mg/1 + 2-ip 1 mg/1 (B4P1), BAP 8 mg/1 + 2-iP 2 mg/1 (B8P2). Masing-masing perlakuan diulang 8 kali sehingga terdapat 64 satuan per- cobaan. Pengamatan dilakukan pada peubah jumlah daun, jum- lah tunas, jumlah akar, lebar daun, panjang daun dan panjang akar.
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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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