Judul: Efektivitas pengencer laktat ringer, modifikasi ringer dan larutan fisiologis NaCI terhadap viabilitas Spermatozoa ikan baung (Hemibagrus nemurus)
Abstrak: Lambatnya perkembangan budidaya ikan ini antara lain disebabkan oleh masih kurangnya informasi tentang fisiologis dari semen ikan baung dan juga kurang dikuasainya teknologi pembenihan. Penelitian ini bertujuan untuk mendapatkan gambaran karakteristik morfometri testes dan fisiologi semen ikan baung serta menentukan salah satu jenis pengecer dan rasio pengecer yang optimal untuk preservasi semen ikan baung.
Keyword: 

Judul: Pengaruh pengencer modifikasi ringer dan phosphate buffer saline (PBS) terhadap motilitas dan fertilitas spermatozoa ikan beronang (siganus guttatus)
Abstrak: Eksploitasi ikan beronang Siganus spp cukup tinggi se- hingga ketersediaan induk sebagai penghasil benih untuk usaha budidaya kurang. Selain itu volume semen ikan yang sedikit diperkirakan mempersulit spermatozoa untuk membuahi sel telur dalam jumlah yang banyak. Pengenceran semen dengan volume tertentu dapat meningkatkan jumlah telur yang dibuahi. Penelitian bertujuan untuk mendapatkan informasi ten- aspek fisiologi semen ikan beronang Siganus guttatus, tang daya tahan spermatozoa dalam pengencer modifikasi Ringer dan PBS dan pengencer semen terbaik dalam menghasilkan motilitas dan fertilitas spermatozoa S. guttatus. Penelitian ini menggunakan 25 ekor ikan beronang S. guttatus jantan yang matang gonad dengan berat 400 dan panjang 23 pengencer Ringer - 32 cm sebagai sumber semen. - 604 gram Tiga macam semen yang digunakan yaitu: modifikasi Ringer I, II dan PBS dengan rasio 1:4, 1:8 dan 1:12. yang diperoleh dari penelitian ini adalah fisiologi motilitas dan fertilitas spermatozoa serta daya tetas telur.
Keyword: Ikan beronang

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