Judul: Pengaruh enzim fitase dalam pakan terhadap kecernaan nutrien dan kinerja pertumbuhan ikan lele dumbo (Clarias sp)
Abstrak: Penelitian ini bertujuan untuk mengetahui pengaruh pemberian enzim fitase terhadap ketersediaan fosfor (P) dari sumber bahan nabati pakan ikan lele. dan pengaruhnya terhadap kinerja pertumbuhan serta limbah P yang dihasilkan. Percobaab ini menggunakan Rancangan Acak Lengkap (RAL) yang terdiri dari 4 perlakuan dan 4 ulangan yaitu: pakan A sebagai kontrol pakan dengan penambahan P anorganik; pakan B tanpa P organik dengan penambahan enxim fitase; pakan C pakan tanpa P organik dengan penambahan enzim fitase.
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Judul: Penggunaan Fitase dalam Pakan Berbasis Tepung Bungkil Kedelai untuk Ikan Baung (Hemibagrus nemurus).
Abstrak: Percobaan ini bertujuan untuk mengevaluasi pengaruh penambahan fitase dalam pakan terhadap kecernaan fosfor (P) dan kinerja pertumbuhan ikan baung (Hemibagrus nemurus). Percobaan ini menggunakan Rancangan Acak Lengkap (RAL) satu faktor, terdiri dari 5 (lima) perlakuan dan 3 (tiga) ulangan, yaitu: pakan A (tanpa fitase dan dengan penambahan fosfor anorganik/kontrol), pakan B, C, D dan E masing-masing penambahan 0, 20, 40 dan 60 mg fitase/100g tepung bungkil kedelai dan tanpa penambahan P anorganik. Data yang diperoleh dianalisa dengan menggunakan sidik ragam (ANOVA), yang dilanjutkan dengan uji Duncan. Ikan baung sebanyak 15 ekor dengan bobot 6,9 + 0,2 g dimasukkan ke dalam akuarium ukuran 50 x 40 x 35 cm. Pakan diberikan 3 kali sehari secara at satiation dan dipelihara selama 60 hari. Hasil menunjukkan bahwa kecernaan P meningkat dari 64,5% menjadi 87,0% dengan meningkatnya kadar fitase dari 0 mg/100 g tepung bungkil kedelai dalam pakan (pakan B) sampai 60 mg fitase/100 g tepung bungkil kedelai dalam pakan (pakan E). Kecernaan P pada pakan E lebih tinggi daripada pakan A (77,6%). Rata-rata pertambahan bobot ikan yang diberi pakan E lebih tinggi (p<0,05) daripada pakan lainnya. Laju pertumbuhan harian mempunyai pola yang sama dengan pertambahan bobot ikan. Nilai konversi pakan (FCR) yang terbaik (p<0,05) dihasilkan pada pakan E, sementara yang terjelek diperoleh pada pakan B. Konsentrasi P, kalsium (Ca) dan seng (Zn) dalam tubuh dan tulang ikan yang diberi pakan E lebih tinggi daripada pakan B, C dan D, tetapi sama dengan (p<0,05) pakan A. Limbah Nitrogen (N) dan P yang dikeluarkan oleh ikan melalui feses yang diberi pakan E 76% dan 20% lebih rendah daripada pakan kontrol.
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Judul: Characteristic of Overshooting Top (OT) Based on  Himawari  8  Satellite  as  a  Convective  Cloud  Feature  that  Generates  Extreme Weather in the Java Island Region
Abstrak: Overshooting Top (OT) is a feature at the top of a convective cloud that is associated with extreme weather. Research on OT in tropical Indonesia is still very limited. The existence of geostationary satellites with wide area coverage and fast frequency observations is useful for observing the fast dynamics of the OT life cycle. Therefore, this study intends to analyze the relationship between OT and extreme weather, updraft and thermodynamic conditions of OT when extreme weather occurs, the best objective method for detecting OT in the day time and night time, and the spatiotemporal distribution of OT in the tropical region of Java Island during the 2018-2021 period. Based on visual analysis using visible channel and Himawari 8 sandwich products, 87% of extreme weather events in Java were accompanied by the appearance of OT. It indicates that the presence of the OT pattern is a convection cloud pattern or feature that is closely related to extreme weather events for the Java Island region. The existence of a time lag between the appearance of OT and extreme weather events on Java Island indicates that the OT of convection cloud can be used as a precursor or nowcasting for the appearance of extreme weather. Most of the convective cloud OT features during extreme weather events on Java Island have altitude that were only able to exceed the altitude of the equilibrium level and few were able to exceed the tropopause level of 9 km – 16 km. The difference in atmospheric conditions during extreme weather events on Java Island, which is in the tropics and subtropics, is a strong and unstable convective energy condition characterized by a larger CAPE, as well as unstable KI, LI, SI and TTI values. It is offset by kinematic factors in the form of a weak vertical wind shear (bulk wind shear 0-6 km) and a higher freezing point height. The difference between extreme weather events in the Java Island region and other tropical regions compared to subtropical regions is the strong updraft speed of convection clouds. The IRW Texture COMB algorithm based on the IRW-Texture Gradient modification and the COMB algorithm shows a significant increase in quality for detecting OT and non-OT pixels in Java. Rainy days with rainfall > 50 mm/day are very common in areas with an altitude of > 500 m. On the other hand, the level of convection activity which is indicated by the presence of OT and lightning is significantly reduced in this area. OT of convective clouds appear more frequently during the DJF season and less frequently during the JJA season. OT often appears during the day time and rarely at night time. Most OTs appear in the central part, away from the south and north coasts of Java Island during the day, while OTs that appear near the south and north coasts of Java Island can appear in the morning or afternoon.
Keyword: convective clouds, extreme weather, Overshooting Tops, Himawari 8 Satellite