Judul: Multiplikasi salak gulapasir (Salacca zalacca) secara invitro dan subkultur dengan metode kultur terapung
Abstrak: Penelitian ini bertujuan memnginduksi multiplikasi salak secara in vitro dengan eksplan berasal dari kecambah dan mengamati pertumbuhan eksplan pada subkultur menggunakan metode kultur terapung. Lima potongan (masing-masing setebal 1 mm) dari pangkal kecambah berumur empat minggu digunakan sebagai eksplan. Eksplan ditanam pada media padat Murashige & Skoog (MS) dengan penambahan 4.0 ppm Benzyl Amino Purin (BAP) dan 200 ppm I-Glutamin. Sebagai perlakuan digunakan empat taraf konsentrasi auksin, yaitu 0.1, 0.4, 0.7, 1.0 ppm 2,4-D. Eksplan yang responsif untuk diregenarasi adalah dari bagian tengah yang merupakan pangkal pelepah daun pertama. Perbedaan konsentrasi auksin tidak berpengaruh nyata terhadap regenerasi.
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Judul: Pengaruh auksin dan sitokinin terhadap pembiakan mikro salak Bali (Salacca edulis Reinw. var. amboinensis Becc.)
Abstrak: Penelitian ini bertujuan untuk mencari kombinasi zat pengatur tumbuh auksin dan sitokinin yang cocok untuk menunjang pertumbuhan dan perbanyakan Salak Bali yang berasal dari eksplan embrio dan kecambah. Penelitian dilaksanakan di Laboratorium Kultur Jaringan, Jurusan Budi Daya Pertanian IPB, mulai Desember 1989 sampai Oktober 1990. Penelitian ini terdiri dari tiga percobaan, semua memakai rancangan acak lengkap faktorial dengan 20 ulangan (Percobaan I dan II) dan 16 ulangan (Percobaan III). Percobaan I menggunakan eksplan kecambah (berasal dari biji yang dikulturkan selama dua minggu pada medium prekondisi), Percobaan II menggunakan eksplan embrio. Kombinasi perlakuan pada Percobaan I sama dengan Percobaan II, terdiri dari 2 faktor yaitu auksin dan sitokinin. Faktor auksin terdiri dari 4 taraf yaitu 0, 1, 10 dan 20 mg/1, faktor sitokinin terdiri dari 0, 10 mg/1 2iP, 10 mg/1 Kinetin dan 5 mg/1 2iP + 5 mg/l Kinetin. Medium dasar yang digunakan yaitu medium MS dengan penambahan 30 g/1 gula dan 7 g/l agar (medium padat). Percobaan III merupakan percobaan kultur embrio pada media MS cair. Perlakuan percobaan III terdiri dari 10 mg/1 2iP, 5 mg/1 IAA + 10 mg/1 2iP, 1 mg/1 NAA + 10 mg/1 BAP, 5 mg/1 NAA + 10 mg/1 BAP, 1 mg/1 NAA + 6 mg/1 BAP, 5 mg/1 NAA + 6 mg/1 ВАР, 1 mg/1 NAA + 2 mg/1 BAP dan 5 mg/1 NAA + 2 mg/1 BAP. Pengamatan dilakukan 2 minggu sekali selama 16 minggu (Percobaan I dan II) dan 24 minggu (Percobaan III)...
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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