Judul: Maskulinisasi Ikan Cupang (Betta splendens) Melalui Perendaman Embrio dalam Ekstrak Purwoceng (Pimpinella alpina)
Abstrak: This study aimed to know the effect of extract of P. alpina for masculinization of Betta splendens. This research used the Completely Randomized Design with 3 treatments that were distinguished by doses of extract of P. alpina, those are 10, 20, and 30 μL/L, and 0 μL/L as control. The treatments are given to 35 embryos by immersion in extract of Pimpinella alpina when eye spots phase or about 28th hour after fertilization. The immersion process was done for 8 hours. The result showed that 20 μL/L dose of P. alpina’s extract produced male fish percentage 62,66%, it’s higher than control (45,91%), and hatching rate was 85,71%. At the higher dose (30 μL/L), male fish population and hatching rate went down with each value 39,72% and 68,57%.
Keyword: 

Judul: Maskulinisasi Ikan Cupang Betta splendens dengan Ekstrak Tanaman Purwoceng Pimpinella alpina Melalui Perendaman Artemia
Abstrak: Ikan cupang Betta splendens jantan memiliki keindahan warna serta sifat yang agresif sehingga banyak diminati dan memiliki harga jual yang lebih tinggi. Penelitian ini dilakukan untuk menguji penggunaan ekstrak tanaman purwoceng dengan teknik perendaman artemia pada maskulinisasi ikan cupang. Penelitian ini menggunakan rancangan acak lengkap dengan tiga perlakuan dosis ekstrak tanaman purwoceng (20, 40, dan 60 mg/L), perlakuan 17α-methyltestosterone (MT) 500 μg/L dan kontrol dengan masing-masing tiga ulangan setiap perlakuan. Artemia bervolume 100 mL diperkaya selama 24 jam melalui perendaman dan diberikan pada larva sejak berumur 4 hari setelah penetasan hingga 40 hari. Jenis kelamin ikan yang telah berumur 2 bulan diidentifikasi. Hasil penelitian menunjukkan bahwa perlakuan ekstrak tanaman purwoceng 20 mg/L memberikan nisbah kelamin jantan (75,00%) dan kelangsungan hidup (86,67%) tertinggi bila dibandingkan dengan kontrol (40,00 % dan 77,78%) dan perlakuan dengan 17-α methyltestosterone (MT) 500 μg/L (62,50% dan 46,67%). Dengan demikian, ekstrak tanaman purwoceng dapat digunakan untuk maskulinisasi ikan cupang melalui perendaman artemia dengan dosis terbaik adalah 20 mg/L yang membuat nisbah kelamin jantan ikan cupang lebih tinggi dari kontrol.
Keyword: artemia, Betta splendens, ekstrak tanaman purwoceng P. alpina, maskulinisasi, perendaman

Judul: Utilization of terra/MODIS L1B data for analysis of horizontal wind profile in the troposphere
Abstrak: This study was concerned with horizontal wind derived from data collected with the Moderate-resolution Imaging Spectroradiometer (MODIS) on board the NASA’s Earth Observation System (EOS)-Terra satellite. The aim of this study is to develop a method for the estimation of horizontal wind movement in the troposphere based on Navier-Stokes equation. The method was applied to a calibrated and geolocated Terra/MODIS L1B 1 km data set. The data inputs to estimate surface temperature are retrieved from TIR (Thermal Infrared) bands 31 (10.780 μm to 11.280 μm) and 32 (11.770 μm to 12.270 μm). The obtained surface temperatures were later used to approximate geopotential height on a constant-pressure surface by using the modified Poisson equation. The main assumptions used are the hydrostatic equilibrium, ideal gas law, constant lapse rate and constant acceleration of gravity. Based on the distribution of geopotential height, the pressure gradient force is measured by the gradient of geopotential on an isobaric coordinate to present the horizontal wind profile. For certain topographic areas especially in the mountain ranges, there was a disadvantage of using pressure as a vertical coordinate which lead to inaccuracy. In spite of that, Terra/MODIS L1B data with 1 km spatial resolution can be used to estimate the horizontal wind movement in the troposphere.
Keyword: