Judul: Keragaman Cendawan Entomopatogen di Taman Nasional Gunung Gede Pangrango, Kawasan Cibodas
Abstrak: Entomopathogenic fungi is fungi which are parasite on insect. These fungi can be used as pest control agents that are environmentally friendly. In Indonesia, their existence and diversity especially Gunung Gede Pangrango National Park (TNGGP) is not well known. This research was conducted to explore their biodiversity in TNGGP. Samples were taken four times, at March 13rd and 28th; April 4th and 21st 2012 with a same season, on two pathways that are have different in heights. They were successfully obtained, identified, and isolated using direct spore method. The result showed that in Cibodas, TNGGP there were five genera of entomopathogenic fungi, namely Hypocrella, Cordyceps, Aschersonia, Gibellula, and Lecanicillium. The first two genera were in teleomorf phase and the others are in anamorf. Successfully isolated specimen is Lecanicillium PR 08
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Judul: Eksplorasi keragaman cendawan entomopatogen di kawasan Cagar Alam Telaga Warna, Cisarua Bogor
Abstrak: Cendawan entomopatogen merupakan cendawan parasit serangga yang dapat dimanfaatkan sebagai agens pengendalian hayati hama tanaman dan bahan baku obat dan tonik. Keberadaan dan keragaman cendawan ini di Indonesia khususnya di Cagar Alam Telaga Warna belum banyak diketahui. Penelitian ini bertujuan mengetahui keragaman cendawan entomopatogen di kawasan CA Telaga Warna, Cisarua Bogor. Pengambilan sampel dilakukan sebanyak enam kali, yaitu pada tanggal 18 dan 28 Maret; 16 Mei; 20, 26, dan 27 Juni 2007, pada dua jalur yang berbeda. Sampel yang diambil berupa cendawan yang berasosiasi dengan serangga. Sampel yang berhasil dikoleksi kemudian diidentifikasi dan diisolasi dengan menggunakan teknik spora tunggal dan parafin. Hasil penelitian menunjukkan bahwa di kawasan CA Telaga Warna terdapat delapan genus cendawan entomopatogen, yaitu Torrubiella, Hypocrella, Cordyceps, Paecilomyces, Aschersonia, Akanthomyces, Beauveria, dan Isaria. Tiga genus pertama merupakan fase teleomorf cendawan entomopatogen dan yang lainnya merupakan fase anamorf. Paecilomyces AY 04, Aschersonia AY 10, dan Isaria AY 17 berhasil diisolasi dengan teknik spora tunggal.
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Judul: Numerical modeling of the hydrodynamics of standing wave and scouring in front of impermeable breakwater with different steepnesses
Abstrak: The aim of this paper is to numerically study the effects of breakwater steepness on the hydrodynamics of standing wave and scouring process in front of impermeable breakwaters. A two-dimensional hydrodynamics model based on the Reynolds Averaged Navier–Stokes (RANS) equations and the Volume of Fluid (VOF) method was developed and then combined with an empirical sediment transport model. Comparisons with an analytical solution and experimental data showed the present model is very accurate in predicting the near bottom velocity and capable of simulating the scour/deposition patterns consistent with experimental data. It was found that the additional terms of bottom shear stress in the momentum equations are necessary to produce a physical scouring pattern. Different breakwater steepnesses produce different characteristics of standing wave, the steady streaming system, and scouring pattern in front of the breakwaters, which also affects the correlations between them. An additional analysis of the turbulence field parameters and the sediment transport rate was also performed. All these important information will be presented in details in this paper and can be worthwhile for designing the breakwater in coastal areas.
Keyword: The RANS–VOF model Standingwave Steadystreamingsystem Scouring pattern Breakwatersteepness