Judul: Efektivitas Pengendalian Penyakit Bakterial pada Pembesaran Ikan Lele Clarias sp. dengan Pakan yang Mengandung Bawang Putih dan Meniran
Abstrak: This study aimed to determine the effectiveness of the use of feed containing Allium sativum and Phyllanthus niruri to control bacterial diseases in catfish grow out. Catfish used in this experiment was as length as 7.27 ± 0.34 cm and as body weight as 0.51 ± 3.53 g. Catfish was maintained in plastic ponds with size of 2 m × 1 m × 0.5 m as many as 12 pieces. The treatments applied were Control (-) (without experimental feeding and without water changing), Control (+) (without experimental feeding and with water changing), Prevention (feeding with Allium sativum dose 1.4% and Phyllanthus niruri 0.7% before water changing for 21 days), medical treatment (feeding with Allium sativum dose 2.8% and Phyllanthus niruri 1.4% after water changing for 14 days). The results demonstrated that the survival in medical treatment reached 95.38% ± 7.43%, that was significantly different from control (+) treatment (P ≤ 0.1). Allium sativum and Phyllanthus niruri treatment with the dose of 2.8% and 1.4% were effective for bacterial disease control in catfish Clarias sp. grow out that showed the highest survival of 95.38%.
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Judul: Efektivitas campuran tepung meniran Phyllanthus niruri dan bawang putih Allium sativum dalam pakan untuk pencegahan infeksi bakteri Aeromonas hydrophila pada ikan lele dumbo Clarias sp.
Abstrak: Motile Aeromonad Septicaemia (MAS) caused by Aeromonas hydrophila induced serious epidemics of ulcerative disease in walking catfish (Clarias sp.). Purpose of this research was to determine the effective dosage of Allium sativum and Pyllanthus niruri powders mixed in commercial feed with more applicable method in the field. The treatments tested were four different dosages of A. sativum and P. niruri powders, namely A (0,1%), B (1,1%), C (2,1%), D (3,1%) and control, namely K⁻ (without A. sativum and P. niruri powders, and injected with PBS 0,1 ml) and K⁺ (without A. sativum and P. niruri powders, and infected with A. hydrophila 0,1 ml). The treatments was given for two weeks before challenging test, at 15th day test in vivo carried out by injecting A. hydrophila (108 CFU/ml) into the fish by intramuscular and observed for 10 days. Parameters measured were survival rate, absolute growth, specific growth rate, clinical symptoms, wound healing, organs morphology, and water quality. Data were processed statistically using completely randomized design ANOVA single factor. The results showed that the survival of treatment K⁻ was 100±0,00%, C 60±20%, A 40±40%, B 40±40%, K⁺ 33,33±11,55%, and D 20±0,0% (p<0,05). The survival was not significantly different between treatment K⁻ and C. Thus C (2,1%) was effective and could be for preventing MAS in catfish (Clarias sp.).
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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.
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