Judul: Peranan sumber karbon eksternal yang berbeda dalam pembentukan bioflok dan pengaruhnya terhadap kualitas air serta produksi pada sistem budidaya udang vaname Litopenaeus vannamei
Abstrak: Total ammonia nitrogen (TAN) is one issue on White shrimp cultivation. To reduce the TAN levels in order to remain within the limits specified in the cultivation process, the addition of organic carbon sources to improve the C / N ratio which aims to encourage the growth of heterotrophic bacteria. The study consisted of two phases. Phase one aims to determine the decrease in the concentration of TAN. This study uses a completely randomized design with four treatments and four reaply such as the addition of a carbon source (A) molasses; (B) tapioca; (C) rice bran; (D) the use of cassava by product with C/N ratio of 10, 15 and 20. Parameters is observed as a decrease in the concentration of TAN and DO, pH and temperature. Data were statistically analyzed by one-way analysis of variance (ANOVA) using Minitab software (version 16.0) at the 95% confidence interval (P <0,05).The measurements of TAN with different C/N ratios giving different values where the C/N ratio of 20 has effect not significantly different from C/N ratio of 15, but has a significantly different effect with the C/N ratio of 10 in all treatments of carbon sources after 24 hours. Phase two study aimed to determine the effect of carbon sources on bioflocs profile, water quality parameters and growth performance of White shrimp. The study consisted of 4 treatments such as the addition of a carbon source (A) molasses; (B) tapioca; (C) rice bran; (D) cassava by product and without carbon, use of C/N ratio of 15 and four reaply. Parameter of water quality are TAN, nitrite, nitrate and ammonia. Bioflocs profile observed is identification of bacteria, Vibrio bacterial counts and the total number of bacteria in the water and shrimp intestine. Production parameters observed is specific growth rate, feed conversion, survival rates and average weights of White shrimp. Water quality parameters, especially TAN, nitrite and ammonia decreased at the end of maintenance period. Results of profile bioflocs found some microorganisms such as worms, phytoplankton and zooplankton. Genus Bacillus sp. was found in all treatments of carbon sources. Highest total number of bacteria present in molasses treatment (water and intestinal shrimp). Vibrio bacteria counts are highest in the no-carbon treatment (water and shrimp intestine). Vibrio bacteria counts are highest in the no-carbon treatment (Water and shrimp intestine). Feed conversion on treatment without carbon carbon (1.67 ± 0.10) were significantly different with the treatment of tapioca (1.41 ± 0.13). White shrimp survival rate during the maintenance treatment without carbon (84.17 ± 3.20%) was lower in all treatments and were significantly different with cassava by product treatment (92.50% ± 5.00).
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Judul: Biofloc Quality and Growth of Vaname Shrimp (Litopenaeus vannamei) With Bamboo Flour Carbon Source in Biofloc System
Abstrak: Kualitas Bioflok dan Pertumbuhan Udang Vaname (Litopenaeus vannamei) pada Sistem Bioflok dengan Sumber Karbon Tepung Bambu. Dibimbing oleh JULIE EKASARI dan MIA SETIAWATI. Prinsip sistem bioflok adalah menumbuhkan mikroorganisme terutama bakteri heterotrof dalam media pemeliharaan untuk mengkonversi limbah nitrogen menjadi biomassa mikroba yang selanjutnya dapat dikonsumsi oleh ikan atau udang. Penggunaan sumber karbon tepung bambu yang memiliki potensi sebagai prebiotik dapat digunakan pada sistem bioflok. Penelitian ini bertujuan mengevaluasi pengaruh penambahan sumber karbon tepung bambu dalam sistem bioflok terhadap kualitas bioflok dan pertumbuhan udang vaname. Penelitian ini menggunakan empat perlakuan sumber karbon yang berbeda, yaitu dekstrosa (Deks), selulosa (Sel), tepung bambu (TB) dan kontrol (tanpa penambahan sumber karbon) dengan empat kali ulangan. Udang dengan bobot awal 6,31 ± 0,01 g ditebar dalam bak fiber berukuran 50x50x100 cm dengan ketinggian air 75 cm dengan kepadatan 20 ekor/bak (106 ekor/m3 ) dan dipelihara selama 60 hari. Udang diberi pakan dengan metode restricted dengan menentukan feeding rate sesuai dengan bobot udang pada saat sampling. Konsentrasi total amonia nitrogen (TAN) pada perlakuan tepung bambu pada enam minggu pertama pemeliharaan secara umum terlihat lebih tinggi daripada perlakuan lain sedangkan konsentrasi nitrit terlihat memiliki trend yang sama untuk semua perlakuan. Volume dan ukuran partikel bioflok pada perlakuan tepung bambu cukup tinggi daripada perlakuan dan kontrol. Hasil penelitian ini menunjukkan penambahan sumber karbon tepung bambu menghasilkan biomassa akhir, tingkat kelangsungan hidup (TKH), dan rasio konversi pakan udang (RKP) yang cukup dibandingkan selulosa dan kontrol. Kata kunci: bioflok, pertumbuhan, tepung bambu, udang vaname, Biofloc Quality and Growth of Vaname Shrimp (Litopenaeus vannamei) With Bamboo Flour Carbon Source in Biofloc System. Guided by JULIE EKASARI and MIA SETIAWATI. The principle of biofloc system is to grow microorganisms, especially heterotrophic bacteria in the maintenance medium to convert nitrogen waste into microbial biomass which can that to be consumed by fish or shrimp. The use of bamboo flour carbon source that has the potential as a prebiotic can be used in biofloc systems. Bamboo flour has good potential for biofloc systems. This study aims to evaluate the effect of the addition of carbon sources of bamboo flour in the biofloc system on biofloc quality and growth of vaname shrimp. This study used four different carbon source treatments, namely dextrose (Deks), cellulose (Sel), bamboo flour (TB) and control (without the addition of carbon sources) with four replications. Shrimp with an initial weight of 6.31 ± 0.01 g were stocked in a 50x50x100 cm fiber tub with a water level of 75 cm with a density of 20 heads/tub (106 heads/m3 ) and maintained for 60 days. Shrimp were fed with restricted method by determining the feeding rate in accordance with the weight of shrimp at the time of sampling. The total ammonia nitrogen (TAN) concentration in bamboo flour treatment in the first six weeks of maintenance was generally higher than other treatments while the nitrite concentration was seen to have the same trend for all treatments. The Volume and particle size of biofloc in bamboo flour treatment is quite high than the treatment and control. The results of this study showed that the addition
Keyword: bioflok, pertumbuhan, tepung bambu, udang vaname

Judul: Kajian frieze groups untuk klasifikasi dan konstruksi desain berdasarkan simetri pada pola
Abstrak: Frieze groups adalah konsep matematika untuk mengklasifikasikan desain pada dua dimensi permukaan yang berulang-ulang dalam satu arah berdasarkan simetri pada pola. Frieze groups merupakan grup yang mempertahankan bentuk pola. Pergerakan bentuk pola terdiri dari translasi, refleksi dan rotasi 180o. Tujuan dari karya ilmiah ini adalah mengkaji sifat Frieze group, mengkaji penggunaan Frieze group dalam mengklasifikasikan simetri pada pola dan mengkonstruksi pola dengan menggunakan software tesselmania. Hasil yang telah diperoleh, bahwa jenis Frieze groups merupakan subgroup dari grup pergerakan pola. Selain itu dapat dilihat dari sifat isomorfik berbagai jenis Frieze groups. Untuk mengkonstruksi sebuah bentuk pola dapat menggunakan salah satu software untuk membentuk sebuah pola bidang datar (dua dimensi) yaitu tesselmania.
Keyword: Frieze groups, Simetri, Pola