Judul: Kajian Pengaruh Jenis Media  dan Penambahan Minyak Zaitun sebagai Induser pada Produksi Enzim Lipase oleh Candida lipolytica
Abstrak: Enzim lipase berfungsi sebagai katalis proses hidrolisis lemak menjadi gliserida parsial, gliserol dan asam lemak. Penggunaannya sangat luas baik di dalam industri pangan maupun non pangan. Mikroorganisme merupakan penghasil lipase yang potensial karena kemampuan produksinya tinggi dan mampu berkembangbiak dengan cepat. Salah satu pemanfaatan enzim lipase yang mempunyai prospek cerah di Indonesia adalah di dalam industri oleokimia karena biaya investasi peralatan lebih murah, hasil yang diperoleh lebih baik dan aman bagi lingkungan. Komposisi media yang baik serta penambahan induser yang tepat akan meningkatkan produksi lipase dari mikroorganisme. Penelitian ini bertujuan untuk mendapatkan jenis media yang tepat dan meneliti pengaruh penambahan minyak zaitun sebagai induser pada produksi enzim lipase oleh Candida lipolytica dengan kultivasi media cair dalam skala laboratorium.
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Judul: Penentuan media kultivasi dan penambahan minyak zaitun sebagai induser pada produksi lipase oleh pseudomonas fluorescens
Abstrak: Lipase (EC. 3.1.1.3, gliserol ester hidrolase) telah banyak digunakan dalam industri detergen, keju, susu dan industri oleo- kimia. Lipase merupakan enzim yang menghidrolisis trigliserida menjadi asam lemak bebas dan gliserol. Penelitian ini ditujukan untuk menentukan media kultivasi dan penambahan minyak zaitun sebagai induser pada produksi li- pase. Media yang dicobakan berupa Media Basal, Nutrient Broth, dan Skim Milk. Pada penelitian ini juga dilakukan identifikasi sifat-sifat lipase, yaitu sifat ekstra/intraselular enzim dan sifat stabilitas enzim terhadap penambahan B-Merkaptoetanol. Penelitian dilakukan dengan memilih media kultivasi yang menghasilkan aktivitas lipase tertinggi, kemudian melakukan pengujian terhadap sifat-sifat lipase, memilih metoda isolasi terbaik dengan menggunakan media terpilih, dan melakukan penambahan minyak zaitun pada berbagai konsentrasi dengan menggunakan media dan metoda isolasi terpilih. Lipase yang dihasilkan oleh Pseudomonas fluorescens bersifat ekstraselular dan tidak stabil dengan penambahan B-Merkaptoetanol. Pertumbuhan bakteri Pseudomonas fluorescens mengikuti per- tumbuhan biner dengan fase-fase pertumbuhan yang terjadi adalah fase lag, log, stasioner dan penurunan.
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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