Judul: Respon Fisiologi Benih Ikan Patin (Pangasius hypopthalmus) pada Pengangkutan Sistem Tertutup dengan Pemberian Zeolit, Arang Aktif dan Minyak Cengkeh
Abstrak: The objective of this research was to determine the effect of zeolit, activated charcoal and clove oil in maintaining water quality in the transport media and minimizing the stress level of Pangasius hypopthalmus juvenile. This research consisted of 6 treatments and 3 replications. Each treatments were; B). 20 g of zeolite + 10 g of activated charcoal; C). 20 g of zeolite + 10 g of activated charcoal + 3 ppm of clove oil; D). 20 g of zeolite + 10 g of activated charcoal + 6 ppm of clove oil; E). 20 g of zeolite + 10 g of activated charcoal + 9 ppm of clove oil; F). 20 g of zeolite + 10 g of activated charcoal + 12 ppm of clove oil, and A as a control (without zeolite, activated charcoal and clove oil). The duration of this research was 72 hours. The result showed that treatment E gave the best result among them. It was indicated by 5,348 ± 0,02 mg/L TAN (Total Ammonia Nitrogen) concentration, 50,42 mg/L CO2, 14,1 ng/ml of cortisol concentration, 1,56 (106×sel/mm3) erythrocyte, 6,52 (104×sel/mm3) leukocyte, 5,5±0,3 gr/100ml hemoglobin, 36,51±0,15 % hematocrit, 83,11% of survival rate. That treatment also showed the fewest of the gill histopathological changes and also showed the best spesific growth rate ( 1,035% of body weight/day).
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Judul: Efektifitas Penambahan Zeolit dan Karbon Aktif Terhadap Kelangsungan Hidup Benih Ikan Patin Pangasionodon sp. Pada pengangkutan Sistem Tertutup
Abstrak: The problem often faced by Indonesian farmers in striped catfish (Pangasionodon sp) fry transportation is low survival rate due to changes in water quality during transportation caused by high consentration of CO2, ammonia accumulation, fish activity, bacterial infection and physical wound from rough handling. An attempt done to neutralize toxic ammonia that is by adding zeolite and active carbon to packing medium, where the zeolites and activated carbon is a material capable of adsorbing ammonia for a certain time. This research used zeolite and carbon composition A (20 g zeolite), B (15 g zeolite + 5 g activated carbon), C (10 g zeolite + 10 g activated carbon), D (5 g zeolite + 15 g activated carbon) and E (20 g activated carbon). Fish density used 300 fry/ℓ for 72 hours every 24 hours samples were taken to measure water quality (DO, TAN, NH3, pH, temperature, CO2). This research resulted thst 5 g zeolite + 15 g activated carbon addition gave the best results with the highest survival rate of 83.3 ± 6.79%, TAN concentration of 4.6816 ± 0.628 mg / ℓ and NH3 concentration of 0.0228 ± 0.005 mg / ℓ, the temperature of 19.7 to 22 ° C, DO of ± 1.99 mgO2, CO2 sebesar 62,84± 5,53 mg/ℓ.
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Judul: Metrik Einstein (Anti-) Self-Dual Berdimensi Empat dengan Metode Cartan
Abstrak: Gravitational field equation can be formulated in differential forms (differential geometry), which describes gravity as a manifestation of the curvature of space-time. Curvature of space-time is characterized by a metric that satisfies the gravitational field equation. With differential forms it can be formulated the (anti-) self-dual Einstein equation, which is a modification of the Cartan structure in (anti-) self-dual basis. Calculation of (anti-) self-dual metric with (anti-) self-dual Einstein equation is simpler than the calculation using Christoffel symbols.
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