Judul: Efektivitas Penambahan β-glukan dan Vitamin C sebagai Feed Additive terhadap Kinerja Produksi Ikan Lele Clarias sp..
Abstrak: This experiment was conducted to evaluate the addition of β-glucan and vitamin C in the feed on the production of catfish Clarias sp.. Juvenile with an average weight of 0.26 ± 0.01 g stoced in the plastic lined pond with a size of 6 x 3 x 0,5 m3 a density of 15,000 juveniles per pond and reared for 20 days. This experiment consisted of 2 treatments and 2 replications. In the first treatment, fish was fed with commercial feed without of β-glucan and vitamin C, whereas in the second treatment fish was fed with commercial feed with β-glucan and vitamin C addition. Fish were fed at 06.00, 16.00, and 24.00 WIB to satiation. The results showed that the fish was fed by commercial feed with of β-glucan and vitamin C addition had better production compared with control.
Keyword: β-glucan, catfish, growth, Vitamin C

Judul: GROWTH PERFORMANCE OF CATFISH (Clarias gariepinus) WITH ADDITION OF IRON (Fe) MINERALS IN FEED
Abstrak: Pengaruh penggunaan mikro mineral Fe (zat besi) pada pakan sangat mempengaruhi kinerja produksi pertumbuhan ikan lele (Clarias gariepinus). Penelitian ini bertujuan menentukan dosis yang tepat terkait penambahan zat besi (Fe) pada pakan yang mampu meningkatkan pertumbuhan ikan lele (Clarias gariepinus). Formulasi pakan dengan kadar Fe berbeda, sebagai perlakuan dalam penelitian ini, menggunakan lima perlakuan dengan masing-masing dosis 0, 15, 30, 60, dan 120 mg kg-1 yang diberikan pada benih ikan lele dengan bobot rata rata awal 9,49±0,01 g sebanyak 15 ekor/akuarium dengan ukuran 90x45x45 cm dan ketinggian air 30 cm. Setelah masa pemeliharaan selama 60 hari, persentase peningkatan bobot sebanyak 409,1% pada perlakuan Fe 30 mg kg-1 pakan, sedangkan pada perlakuan kontrol yang tidak dilakukan penambahan Fe pada pakan, mengalami peningkatan sebesar 309,1%. Hasil penelitian menunjukkan bahwa parameter kinerja pertumbuhan (biomassa akhir, bobot individu akhir, tingkat kelangsungan hidup, dan laju pertumbuhan spesifik) pada ikan lele yang diberi dosis Fe menunjukkan hasil yang berbeda nyata (p<0,05) terhadap ikan lele dengan perlakuan kontrol. Berdasarkan hasil dari penelitian ini penggunaan dosis terbaik terhadap penambahan Fe pada pakan yaitu 30 mg kg-1 pakan., The influence of micro mineral Fe (iron) usage in feed greatly affects the performance and growth of catfish (Clarias gariepinus). This study aims to determine the appropriate dosage of iron (Fe) supplementation in the feed that can enhance the growth of catfish (Clarias gariepinus). Feed formulations with different Fe levels were used as treatments in this research, consisting of five treatments with doses of 0, 15, 30, 60, and 120 mg kg-1, given to catfish juveniles with an average initial weight of 9.49±0.01 g, totaling 15 individuals per aquarium measuring 90x45x45 cm with a water height of 30 cm. After a 60-day rearing period, the percentage of weight gain was 409.1% in the treatment with 30 mg kg-1 Fe in the feed, while the control treatment without Fe supplementation in the feed experienced an increase of 309.1%. The research results indicate that growth performance parameters (final biomass, final individual weight, survival rate, and specific growth rate) in catfish given Fe doses show statistically significant differences (p<0.05) compared to the control treatment. Based on the findings of this study, the optimal dosage for Fe supplementation in the feed is 30 mg kg-1.
Keyword: ikan lele, pertumbuhan, zat besi, catfish, growth, iron, catfish, growth, iron

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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