Judul: Toksisitas logam berat Cu pada berbagai pH terhadap konsumsi oksigen dan respon hematologi ikan nila gift (Oreochromis sp)
Abstrak: Copper is one of the essential element useful for metabolism of aquatic organisms. Its usually used to control growth of algae and pathogenic bacteria in aquatic environment, but it can be toxic if in large quantities. The pH value is very influential on copper specification in water. The aim of this research was to analyse the toxicity of copper element at various pH on oxygen consumption and haematology responses of nile tilapia. This results can be used as information for aquaculturists and the society at large on copper toxicity incase of change in the water pH value. The results of this research indicates that significant difference in all the blood parameters (average erythrocyte, leucocyte, Hct, Hb and leucocyte differentiation) between treatments (p<0,05) with preference, decreases with decrease in pH value. Based on filaments histology analysis results indicates that infection on gill filament, kidney and skin hence interferes with the rate of oxygen consumption and abnormality in the blood of specimen. Fish survival rate in the P1 (pH 5±0,5) 46.67% was lower than in other treatments. Accumulation of copper due to decrease in water pH also decreases oxygen consumption rate, as well as blood parameters.
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Judul: Toksisitas nikel [ni] terhadap ikan nila gift (Oreochromis niloticus) pada media berkesadahan lunak (soft hardnes)
Abstrak: Nickel is a member of heavy metals. It can potentially poison the blood, interfere the respiratory system, damage tissues and membranes of lenders, and change the cell system. This research aimed to determine the effect of nickel toxicity on various biochemical processes in body GIFT tilaphia such as : level of oxygen consumption, hematological system, histopathology system, level of nickel accumulation,growth rate, and on survival rate. This research was conducted in three stages: test value range, acute test, and sub-chronic test. Acute test consisted of 5 treatment concentrations (0.00, 10.67, 18.98, 33.76, and 60.05 ppm). Sub-chronic test consisted of 3 phases (0.00, 1.39, and 4.18 ppm). Lc-50 value of 96 hours was 13.93 ppm. The level of nickel accumulations in flesh on treatment with concentrations of 60.05, 33.76, 18.98, 10.67, and 00:00 ppm respectively were: 73.37, 56.08, 42.00, and 32.90 mg/kg, while at 0:00 ppm, nickel was not detected. Generally, level of oxygen consumption in chronic sub test decreased significantly. After 32 days nickel exposure, treatment with concentration 4,18 and 1,39 ppm was respectively down: 0,47 to 0,14, and 0,46 to 0,21. At 0,00 ppm, it also decreased level of oxygen consumption but it was still stable relatively, from 0,49 to 0,42. Nickel exposure for 30 days also decreased hematocrit level, hemoglobin, erythrocyte, increased number of leukocytes, reduced growth rate, and damaged gill and liver
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Judul: Pengembangan model markov tersembunyi pada identifikasi pembicara
Abstrak: Model Markov Tersembunyi merupakan suatu model yang tersusun dari dua buah proses stokastik, yaitu rantai Markov untuk menampung kemajuan temporal dan proses yang teramati untuk menampung variasi akustik. Model ini dapat digunakan sebagai metode pencocokan pola pada sistem identifikasi pembicaraan. Setiap model mewakili referensi pola dari seorang pembicara di dalam sistem identifikasi pembicara.
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