Judul: Kandungan Senyawa Antibakteri dalam Anggrek Dendrobium  Woo Leng yang Berasal dari Lapang dan Kultur In Vitro
Abstrak: Aggrek sebagai tanaman hias dapat juga dimanfaatkan sebagai tanaman obat. Perbanyak anggrek di lapang yang membutuhkan waktu yang lama dapat dipersingkat dengan menggunakan teknik kultur jaringan tanaman di mana hasilnya bisa diproses menjadi obat-obatan, khususnya antibakteri.
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Judul: Pengaruh komposisi larutan pengawet terhadap vase life bunga anggrek dendrobium
Abstrak: Anggrek merupakan salah satu komoditi tanaman hias yang mempunyai nilai estetika dan nilai ekonomi tinggi. Tidak sedikit keuntungan yang dapat diperoleh dari tanaman ini, baik untuk peluang usaha, peningkatan pendapatan, maupun devisa bagi negara. Nilai ekspor anggrek di Indonesia secara keseluruhan pada tahun 2002 adalah US $ 4.1 juta. Genus yang potensial untuk dikembangkan sebagai anggrek potong adalah Dendrobium. Akan tetapi untuk memenuhi kriteria anggrek potong Dendrobium diperlukan suatu usaha selain dalam hal teknik budidaya. Usaha penanganan pasca panen bunga potong anggrek diperlukan agar vase life bunga ini dapat maksimal. Larutan pengawet (holding solution) dapat digunakan untuk memperpanjang umur kesegaran atau vase life bunga. Oleh karena itu tujuan penelitian ini adalah menentukan komposisi larutan perendam yang tepat sehingga dapat memperpanjang kesegaran (vase life) bunga potong anggrek Dendrobium. Rancangan yang digunakan adalah Rancangan Kelompok Lengkap Teracak (RKLT) satu faktor, yaitu komposisi larutan pengawet yang terdiri atas 9 perlakuan. Perlakuan-perlakuan tersebut yaitu: aquades (P1) sebagai kontrol, sukrosa 3% (P2), sukrosa 3% + asam sitrat 150 ppm (P3), sukrosa 3% + asam salisilat 150 ppm (P4), sukrosa 3%+ alumunium sulfat 150 ppm (P5), sukrosa 3% + asam sitrat 150 ppm + perak nitrat 25 ppm (P6), sukrosa 3% + asam sitrat 150 ppm + sodium hipoklorit 4 ppm (P7), sukrosa 3% + asam sitrat 150 ppm dan Physan-20 (P8), serta sukrosa 3% + asam sitrat 150 ppm dan Chrysal Professional Glory (P9). ...
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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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