Judul: Evaluasi Daya Pembentukan Umbi Mikro Beberapa Galur Kentang Transgenik Pembawa Gen Kitinase Secara In Vitro
Abstrak: Penelitian ini bertujuan untuk: mengetahui respon pembentukan umbi mikro yang dihasilkan dari beberapa galur kentang transgenik pembawa gen kitinase secara in vitro. Penelitian dilaksanakan di Laboratorium Kultur Jaringan Tanaman, Jurusan Budidaya Pertanian. Faperta, IPB dari bulan Januari sampai dengan bulan Agustus 2002.
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Judul: Pengaruh jenis zat penghambat tumbuh dan sitokinin terhadap pengumbian in vitro kentang (Solanum tuberosum)
Abstrak: Penelitian ini bertujuan untuk mengetahui pengaruh kombinasi beberapa jenis sitokinin dan zat penghambat tumbuh yang diberikan pada konsentrasi optimum terhadap pembentukan dan produksi umbi mikro kentang pada sistem pengumbian cair-cair. Penelitian dilaksanakan di Labora- torium Kultur Jaringan, Jurusan Budidaya Pertanian, Fakul- tas Pertanian, IPB dan berlangsung sejak bulan Januari 1990 sampai Juni 1990. Penelitian ini merupakan percobaan faktorial dengan dua faktor yaitu jenis sitokinin dan jenis zat penghambat tumbuh, masing-masing terdiri atas 4 jenis zat pengatur tumbuh. Perlakuan diberikan pada media pengumbian. Per- cobaan ini menggunakan media dasar Murashige dan Skoog (MS) ditambah sukrosa 3% untuk media pertunasan dan 9% pa- da media pengumbian. Pada kedua jenis media ditambahkan 4 ppm Ca Pantotenat. Percobaan terdiri atas 3 tahap yaitu tahap perbanyak- an eksplan, tahap pertunasan dan tahap pengumbian. Per- lakuan diberikan pada tahap pengumbian. Jenis Sitokinin yang digunakan ialah 5 ppm BA, 10 ppm Kinetin, 50 ppm Be- nomyl dan 100 ppm Adenin Sulfat. Sedangkan jenis zat...
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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