Judul: Mempelajari pengaruh dosis enzim alpha-amilase dan glukoamilase serta waktu sakarifikasi terhadap mutu dan rendemen sirup glukosa dari pati sagu
Abstrak: Penelitian ini bertujuan untuk mempelajari pengaruh dosis enzim alpha-amilase dan glukoamilase serta waktu sakarifikasi pada proses hidrolisa pati sagu terhadap mutu dan rendemen sirup glukosa yang dihasilkan. Perlakuan dalam penelitian ini terdiri dari 3 faktor. Faktor perlakuan dosis enzim alpha-amilase terdiri dari 3 taraf (1.6, 1.3 dan 2.0 g/kg tepung kering), dosis enzim glukoamilase 3 taraf (1.8, 2.0 dan 2.2 ml/kg tepung kering) dan waktu sakarifikasi 3 taraf (46, 48 dan 50 jam). Analisa terhadap sirup glukosa meliputi rendemen, ekivalen dekstrosa, kadar abu dan warna/kejernihan. Hasil penelitian menunjukkan perlakuan dosis enzim alpha-amilase berpengaruh sangat nyata terhadap rendemen sirup, berinteraksi dengan waktu sakarifikasi berpengaruh nyata terhadap ekivalen dekstrosa, tetapi tidak berpengaruh nyata terhadap kadar abu dan warna/kejernihan. Faktor perlakuan dosis enzim glukoamilase berpengaruh nyata terhadap rendemen sirup, berinteraksi dengan waktu sakarifikasi berpengaruh nyata terhadap ekivalen dekstrosa, tidak berpengaruh nyata terhadap kadar abu, tetapi berpengaruh nyata terhadap warna/kejernihan.
Keyword: 

Judul: Pengaruh dosis enzim glukosa isomerase dan lama isomerisasi terhadap rendemen dan mutu high fructose syrup dari sagu (Metroxylon rumphii Mart.)
Abstrak: High Fructose Syrup (HFS) adalah gula cair hasil proses Isomerisasi dari sirup glukosa dengan bantuan katalis enzim glukosa isomerase dengan merek dagang Sweetzyme tipe A. Tujuan dari penelitian ini adalah untuk mempelajari pembuatan High Fructose Syrup (HFS) dari pati sagu dengan bantu- an katalis kombinasi asam dan enzim. Selanjutnya dipelajari pola perubahan sifat-sifat fisikokimia sirup fruktosa yang meliputi rendemen, kadar gula pereduksi, ekivalen dekstrosa, kadar fruktosa, derajat konversi, kejernihan, dan kadar abu pada dosis enzim glukosa isomerase (1.2, 1.7, 2.2 g/kg sirup) dan lama isomerisasi (18, 24, 30 jam). Rancangan percobaan yang digunakən ədalah Rancangan Acak Lengkap pola faktorial dengan dua kali ulangan. Hasil penelitian menunjukkan bahwa sifat-sifat fisikokimia sirup fruktosa yang meliputi rendemen, kadar gula pereduksi, kejernihan, dən kədər abu tidak dipengaruhi oleh faktor dosis enzim glukosa isomerase dan faktor lama isomeri- sasi maupun interaksi antara kedua faktor tersebut di atas. Faktor lama isomerisasi berpengaruh nyata terhadap ekivalen dekstrosa, dan berpengaruh sangat nyata terhadap kadar fruk- tosa dan derajat konversi. Akan tetapi kadar fruktosa dan derajat konversi tidak dipengaruhi oleh faktor dosis enzim glukosa isomerase dan interaksi antara faktor dosis enzim glukosa isomerase dan lama isomerisasi. Hasil analisis sirup fruktosa yang dihasilkan yang meli- puti rendemen, kedar gula pereduksi, ekivalen dekstrosa, ka- dar fruktosa, derajat konversi, kejernihan, dan kadar abu ma- sing-masing mempunyai nilai rata-rata 68.55 persen, 48.36 per- sen, 87.72, 24.49 persen, 27.78 persen, 30.42 persen, 0.57 persen…
Keyword: 

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