Judul: Regenerasi Pucuk, Daun dan Petiol Tanaman Strawberry (Fragraria X ananassa) CV. Sweet Heart In vitro
Abstrak: Tujuan penelitian ini adalah untuk mempelajari pengaruh NAA dan BAP terhadap merfogenesis ekaplan pucuk, daun dan petiol tanaman strawberry varietas budi daya Sweet Heart secara in vitro, Jurusan Budi Daya Pertanian, Institut Pertanian Bogor. Seluruh eksplan pucuk yang ditanam dapat tumbuh dan berkembang, sedangkan pada eksplan daun hanya 37 % dan petiol 17 %.
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Judul: Studi perbanyakan tanaman stroberi (Fragaria x ananassa Duch cv. Yael) secara in vitro
Abstrak: Penelitian ini terdiri dari dua percobaan terpisah. Percobaan pertama bertujuan untuk mendapatkan jenis sitokinin dan auksin terbaik dalam perbanyakan tunas tanaman stroberi. Percobaan kedua bertujuan untuk mendapatkan jenis auksin terbaik dalam pengakaran tunas tanaman stroberi. Percobaan pertama adalah percobaan faktorial yang menggunakan rancangan lingkungan Rancangan Acak Lengkap (RAL). Faktor pertama adalah jenis sitokinin yakni: BAP, kinetin, 2i-P dan thidiazuron dengan masing-masing konsentrasi 1.00 µM. Faktor kedua adalah jenis auksin yakni: IAA, NAA, IBA, dan 2,4-D dengan masing-masing konsentrasi 0.20 µM. Setiap perlakuan diulang sebanyak 8 kali. Setiap botol kultur merupakan satu satuan percobaan yang berisi 2 eksplan tunas. Percobaan kedua digunakan Rancangan Acak Lengkap dengan perlakuan jenis auksin. Jenis auksin yang digunakan yakni: IAA, NAA, IBA dengan konsentrasi masing-masing 0.00, 0.50, 1.00, 1.50, 2.00 dan 2.50 µM. Setiap perlakuan diulang sebanyak 8 kali. Setiap botol kultur merupakan satu satuan percobaan yang berisi 2 planlet. Media perbanyakan tunas terbaik tanaman stroberi Fragaria x ananassa Duch. cv. Yael adalah perlakuan media MS ditambah BAP 1.00 μM dan IAA 0.20 uM. Tunas dapat disubkultur kembali untuk perbanyakan selanjutnya atau dapat dipindah dalam media pengakaran untuk kemudian diaklimatisasi. Media pengakaran tunas tanaman stroberi Fragaria x ananassa Duch. cv. Yael terbaik adalah media MS ditambah IBA pada konsentrasi 2.00 µм. Penambahan konsentrasi IBA lebih besar dari 2.0 μM dapat menghambat pertumbuhan dan perkembangan akar.
Keyword: strawberry, Fragaria x ananassa Duch. cv. Yael, in vitro, plant propagation

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