Judul: Komposisi Mikroorganisme Penyusun dan Kandungan Nutrisi Bioflok dalam Media Pemeliharaan Induk Ikan Nila Oreochromis niloticus dengan Aplikasi Teknologi Bioflok
Abstrak: This study aims to analyze the composition of microorganisms and primary nutrients in biofloc collected from tilapia Oreochromis niloticus broodstock tanks cultured with the application biofloc technology. Samples were taken from 8 biofloc bath unit tilapia maintained for 3 months with two different treatments ie control treatment (without the addition of molasses) and bioflok (with the addition of molasses). The results showed that the abundance of bacteria and plankton in biofloc treatment tends to increase with the maintenance period. The results of the identification of bacterial isolates found in water conservancy media obtained 7 types of bacteria in biofloc system are Actinobacter sp., Listeria sp., Kurthia sp., Actinobacillus sp., Streptococcus sp., Bacillus sp., Micrococcus sp. and 5 types of bacteria in the control Actinobacter sp., Listeria sp., Kurthia sp., Actinobacillus sp., Streptococcus sp.. Types of phytoplankton that dominate biofloc treatment at the end of the study were a group of Chlorophyceae genus Scenedesmus as many as 1,936,804 cells/L. While in the control Cyanophyceae dominated by genus of Microcystis much as 4,967,296 cells/L. Contain of biofloc nutrition were 37.37 % protein, 1.66% of lipid, 2.05% of crude fiber, and 2.26% of ash.
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Judul: Pertumbuhan dan gambaran darah Ikan Nila (Oreochromis niloticus) yang diberi pakan dengan suplementasi tepung bioflok
Abstrak: Teknologi bioflok telah diaplikasikan pada budidaya udang maupun ikan. Bioflok dalam bentuk tepung memiliki kandungan nutrisi yang cukup tinggi dan berpotensi untuk digunakan sebagai imunostimulan. Tujuan penelitian ini adalah untuk mengevaluasi pengaruh suplementasi pakan dengan tepung bioflok terhadap pertumbuhan dan gambaran darah ikan nila. Perlakuan yang diterapkan adalah pemberian pakan dengan penambahan tepung bioflok sebanyak 2,5% dan 5%, serta pakan tanpa penambahan tepung bioflok sebagai kontrol. Hasil penelitian ini menunjukkan suplementasi tepung bioflok dalam pakan tidak berpengaruh nyata (P>0,05) terhadap pertumbuhan, namun dapat meningkatkan sistem imun non spesifik yang ditunjukkan dengan meningkatnya sel darah putih dan aktivitas fagositik ikan nila. Penambahan tepung bioflok sebanyak 5% menghasilkan jumlah sel darah putih dan aktivitas fagositik tertinggi, yaitu berkisar 8-8,6×104 sel/mm3 dan 40-41%.
Keyword: tilapia, biofloc meal, growth, blood parameters

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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