Jurnal Ilmu Pertanian Indonesia
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distribusi spesial populasi simping (Placuna placenta) di Pesisir Tanggerang
No full textSimping population (Placuna placenta) represent a type of benthic biota and it immobility. This species disperse in any coastal and territorial water of Indonesia such as in north Banten coast, Bekasi coast, Tuban, Gresik and Kalimantan. Dispesion of simping in Banten coastal having differences with other site
Biaya Transaksi Usaha Penangkapan Ikan di Kota Pekalongan
No full textEconomic efficiency is often measured from production aspect and lack of attention to non-production aspect, such as transaction cost
Pemetaan quantitative trait loci untuk sifat berskala kategorik
No full textGenes or regions on chromosome underlying a quantitative trait are called quantitative trait loci (QTL). Characterizing genes controlling quantitative trait on their position in chromosome and their effect on trait is through a process called QTL mapping. In estimating the QTL position and its effect, QTL mapping utilizes the association between QTL and DNA makers. However, many important traits are obtained in categorical scale, such as resistance from certain disease. From a theoritical point of view, QTL mapping method assuming continuous trait could not be applied to categorical trait. This research was facusing on the assessment of the performance of maximum likehood (ML) and regression (REG) approach employed in QTL mapping for binary trait by means of simulation study. The simulation study to evaluate the performance of ML and REG approach was conducted by taking into accounte several factors that may affecting the performance of both approaches. The factors are (1) maker density, (2) QTL effect, (3) sample size, and (4) shape of phenotypic distribution. Form simulation study, it was obtained that the two approaches showing comparable performance. Hence, QTL analysis could be performed using these two approaches due to their similar performance
Mineral besisebagai pengikat vitalisas ikan kerapu bebek (Cromileptes altivelis) saat kondisi stres hipoka
No full textHumpback grouper (Cromileptes altivelis) is sensitive to stress that coused low growth rate, mortality, and harvest. Iron is micronutrient that can enhance the immunity. This experiment was conducted to determine the iron supplement in the feed for humpback grouper fish to vitality increase at hypoxia stress condition. The fish weight 4.14+-0.01 g/ind. and was cultured in 60x40x50 cm aquarium and stocked at a density of 10 ind./aquarium. After reader for 61 days, the fish was
Produksi konsentrat karetenoid dari fraksi cair minyak menggunakan metode kromotografi
No full textThis research was aimed to obtain an optimum conditions for production of liquid fraction of crude palm (CPO) containing high concentration of carotenoids,as well as to get the optimum condition on production o carotenoids concentrate, by using adsorption column chromatography method at laboratory scale. Adsorbent used were rice hull ash and silica gel. In order to get high amount of carotenoids on liquid fraction of palm o the palm oil was treated with n-hexane and was mixed by using shaker. Based on recovery and tot carotenoids parameters contained in the liquid fraction, the optimum condition to get high total carotenoids o liquid fraction was shown when employing 50% hexane,mixing at 200 rpm for 10 minutes,and decanting for days at ambient temperatures. The palm oil liquid fraction contained 275 ppm carotenoids with 81.0 recovery. The next step was the separation of carotenoids from other components of palm oil by usin adsorption column chromatography method with rice hull ash and silica gel as adsorbents. The optimu condition on separation were found by using ratio of rice hull ash:silica gel 30:10, which produced total corotenoids of 317.2 11g and recovery of carotenoids of 41.7%. The final concentration in carotenoi concentrate was 1865.9 ppm,4 times higher than the initial concentration in CPO. Key words: carotenoids,palm oil,adsorption column hromatograph