Judul: Evaluasi Kecernaan Jagung yang Diolah Secara Kimia dan Fermentasi Sebagai Bahan Pakan Ikan Nila Oreochromis sp.
Abstrak: This aims of this experiment were to find the best ways of processing corn to increase digestibility values of the feed for tilapia. Material used for chemicaltreatment was NaOH solution, and for fermentation were Tricoderma viride, Phanerochaete chrysosporium and Bacillus megaterium. This study use Complete Randomized Design (CRD), consists of four treatments and three replicates. The treatments are : non-treated corn as control (feed A), chemical-treated corn soaked in NaOH (feed B), fermented corn with fungi Tricoderma viride and Phanerochaete chrysosporium (feed C), and fermented corn with bacteria Bacillus megaterium (feed D). The data were analyzed using SPSS 16.0, ANOVA with 95% confidence level and Duncan's test to determine the effect of different treatment in each variable. Parameters observed were protein digestibility, energy digestibility, raw material digestibility, and total digesbility. Based on the parameters of energy digestibility, ingredient digestibility, and total digestibility feed D shown to have the highest value of those parameters (72,98%, 77,95%, and 67,16%, respectively) and significantly different (P <0.05) compared to control feed (feed A). The results of this study shows that the best way of processing corn to increase its values in tilapia feed is by fermentation using bacteria Bacillus megaterium.
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Judul: Evaluasi kecernaan campuran bungkil inti sawit dan onggok yang difermentasi oleh Trichoderma harzianum Rifai untuk pakan Nila Oreochromis sp
Abstrak: Utilization of palm kernel cake (PKC) and tapioca waste (TW) as fish diet is limited due to the high fiber content. The experiment consisted of two step. The aim of first experiment was to evaluate the reduction of crude fiber from the mixture of 80% PKC and 20% TW fermented by Trichoderma harzianum with incubation period of 6, 8 and 10 days respectively. An inoculum dose was 5%, and the number of T. harzianum colonies were 2.6x106 CFU/ml. The result showed that the highest crude fiber reduction was achieved in the incubation period of 8 days, reaching 44.28%. The fermentation process could also increased the glucose content. The aim of second experiment was to evaluate the digestibility of fermented PKC-TW (FPKC-TW) for tilapia. Digestibility test was conducted on tilapia with an average initial weight of 41.27 ± 2.16 g and reared in each aquarium (40x50x35 cm) for 15 days. The result showed that digestibility of fermented 80% PKC-20%TW was higher than unfermented PKC. Based on the results of this study, it can be concluded that the use of T. harzianum reduced the fiber content of PKC-TW, thereby increasing the digestibility
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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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