Judul: Efektivitas Penambahan Simplisia Rimpang Temulawak Curcuma xanthorrhiza Roxb. pada Pakan Ikan Nila Oreochromis niloticus Terhadap Infeksi Streptococcus agalactiae
Abstrak: Streptococcus agalactiae is a common causative agent for Streptococcosis in tilapia. The purpose of this research was to evaluate the efficacy of Curcuma xanthorrhiza Roxb. simplicia feed supplementation tilapia immune systems against the S. agalactiae infection. This research applied different dosages of C. xanthorrhiza Roxb. ie 25; 50; and 200 gr/kg feed. The control treatment was fed only by commercial feed without C. xanthorrhiza Roxb. After that, the fish were challenged with pathogenic cells at concentration of 4.0 x 109 CFU/ml. Supplementation of dietary treatments did not result significant (P>0.05) effect on the survival rate compared to positive control. Treatment of 50 gr/kg feed and 200 gr/kg feed improved the immune systems of tilapia especially on lysozyme before challange test (597 UI/ml/minute and 717 UI/ml/minute) and after challenge test (671 UI/ml/minute and 1488 UI/ml/minute). The C. xanthorrhiza Roxb. feed supplementation decreased the specific growth rate in treatment 25; 50; and 200 gr/kg feed (0.29%, 0.53%, and 1.57%) compared with control but increased the feed convertion ratio (0.01, 0.04, and 0.15) respectively.
Keyword: C. xanthorrhiza Roxb., S. agalactiae, simplicia, feed, tilapia

Judul: Aplikasi sinbiotik melalui pakan pada Ikan Nila Merah Oreochromis niloticus yang diinfeksi Streptococcus agalactiae
Abstrak: One of the constraint on tilapia cultivation is presence of streptococcosis disease caused by Streptococcus agalactiae. Application of synbiotic is one of alternative in controlling the streptococcosis disease in red tilapia. The aims of this research were to compare the effectiveness of synbiotic application in feed fish in artificial feed (PB) and commercial feed (PK) to study the growth performance and to prevent the streptococcosis in red tilapia. Probiotic strain used in this research was NP5, whereas the prebiotic was prepared from extract of sweet potato from sukuh variety. Treatments in this research were positive control with feeding without supplementation of synbiotic & infected by S. agalactiae, negative control with feeding without supplementation of synbiotic & injected by PBS (Phosphate Buffer Saline), and feeding with the addition synbiotic & infected by S. agalactiae. Each treatment was tested on artificial feed (containing protein of 23%) and commercial feed (containing protein of 38%). Feeding treatment was given within first 30 days and on 31st day all fish (except negative control treatment) were challanged by intramuscularly injection of S. agalactiae (109 cfu/ml). The mortality rate was observed daily within 6 days. Result showed that the growth and the feed efficiency of fish fed by commercial feed was higher than that of artificial feed. Application of synbiotic could increase the feed efficiency in both of artificial feed and commercial feed although have not resulted the better growth. Moreover, the synbiotic could increase immune response and the survival rate of tilapia post challenge test. Treatment of synbiotic in commercial feed and artificial feed resulted survival rate of 83.33%, whereas the survival rate of positive control was only 25% (P<0.05).
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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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