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: 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: Penggunaan Teorema Homeomorphy 2-Manifold dan Teorema Euler Poincare pada Torus 𝑇�� dan Simplicial Complex 𝐾��
Abstrak: Two dimensional topological spaces are said to be homeomorphic if they have the same topological invariant, where one of topological invariant used is an Euler characteristic. Homeomorphy 2-Manifold’s Theorem and Euler Poincare’s Theorem are used to distinguish two topological spaces. Homeomorphy 2-Manifold’s Theorem uses Euler characteristic to identify two dimensional topological spaces. Euler Poincare’s Theorem is an alternative way to find Euler characteristic with Betti number, which is topological invariant as well. The objective of this paper is to investigate the homeomorphism of torus 𝑇����� and simplicial complex 𝐾�����. Topological space torus and simplicial complex 𝐾����� have the same Euler characteristic, which is two. Based on Homeomorphy 2-Manifold’s Theorem topological space torus 𝑇����� and simplicial complex 𝐾����� is homeomorphic.
Keyword: simplicial, torus, Euler, homeomorphism, topology