Judul: Pengaruh Pemberian Kadar Kromium yang Berbeda dalam Pakan Terhadap Kinerja Pertumbuhan Ikan Baung ( Hemibagrus nemurus Blkr)
Abstrak: This experiment was conducted to determine the effect of dietary chromium on the growth performance of baung fish (Hemibagrus nemurus Blkr). Thisa experiment used four diets containing different level of chromium yeast (0.0,1.47,3.20, and 4.59 ppm kg-1). Twenty fish with the initial body weight 7.0 ± 0.2 g were placed in each aquarium (50x40x35 cm). Fish fed on the experimental diets three times daily at station for 60 days. Results of this experiment showed that chromium diets produced body protein level, ratio RNA/DNA and protein retention higher than that of non chromium diet. However, diet contained 3.20 ppm chromium yeast produced the highest protein deposition, and produced the highest daily growth rate and feed efficiency. The liver and carcass glikogen level increased as the chromium level of diet was elevated, on the other side, body lipid level decreased as the chromium level of diet was elevated
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Judul: Pengaruh pemberian kromium organik terhadap kinerja pertumbuhan ikan bawal air tawar (colossoma macropomum)
Abstrak: Penelitian ini dilakukan untuk mengevaluasi pengaruh pemberian kromium organik terhadap kinerja pertumbuhan ikan bawal air tawar. Penelitian ini menggunakan 5 perlakuan pakan uji yang terdiri dari 4 kadar kromium (0.0; 1.5; 3.0; dan 4.4 ppm Cr+3) dengan isoprotein (37.5%) dan isoenergi serta satu pakan mengandung 2.2 ppm Cr+3 dan kadar protein 30.3%. Dua puluh ekor ikan dengan bobot rata-rata individu 11.34 - 12.31 g dipelihara dalam setiap akuarium (volume air 100 lt). Ikan diberi pakan dua kali sehari (pagi dan sore hari) secara at satiation selama 60 hari. Hasil penelitian memperlihatkan bahwa pemberian pakan yang mengandung kromium organik akan mengefisienkan penggunaan karbohidrat sehingga retensi protein dan efisiensi pakan meningkat serta menekan katabolisme protein sehingga amonia yang diekskresikan rendah, sedangkan laju pertumbuhan harian (LPH) sama (p>0.1). Pemberian kromium organik juga meningkatkan kadar glikogen hati dan daging (p<0.05) serta rasio RNA/DNA (p<0.1). Kadar 3.0 ppm Cr+3 dalam pakan menghasilkan respon terbaik pada ikan bawal ikan air tawar (C. macropomum).
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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