Judul: Efek Asam γ-Linolenat dari Spirulina platensis pada Upaya Penghambatan Hiperkolesterolemia
Abstrak: Dewasa ini penderita penyakit hiperkolesterolemia cenderung meningkat.Salah satu faktor penyebab hiperkolesterolemia adalah konsumsi makanan kaya akan asam lemak jenuh dan kolesterol. Hiperkolesterolemia merupakan suatu keadaan yang ditandai oleh tingginya kadar kolesterol dalam darah. Penyakit hiperkolesterolemia ini dapat berianjut menjadi aterosklerosis yang akhimya menjadi penyakit jantung koroner. Oleh karena itu, dunia ilmu pengetahuan dan kedokteran berupaya mencari altematif pengobatan untuk penyakit ini. Salah satu jenis bahan yang digunakan untuk obat altematif adalah ganggang. Berbagai ganggang telah diteliti dan salah satunya adalah S. plalensis. Ganggang ini meogaodung GLA dapat menurunkan kadar LDL pada penderita hiperkolesterolemia. Gaoggang hijau biro ini telah berhasil dibudidayakan dalam medium yang mengandung limbah lateks.
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Judul: Potensi Spirulina platensis Sebagai Antihipertensi Secara In Vitro
Abstrak: Hipertensi menjadi penyebab kematian nomor tiga setelah stroke dan tuberkulosis di Indonesia. Mikroalga Spirulina platensis memiliki kandungan senyawa metabolit sekunder yang berpotensi sebagai sediaan obat alami untuk mengurangi resiko hipertensi.Tujuan penelitian ini adalah untuk mengoptimalkan produksi S. platensis sebagai bahan baku pangan fungsional terutama sebagai suplemen untuk mengurangi resiko hipertensi. Spirulina platensis dikultivasi selama satu minggu dalam media Walne dan RI1+Urea. Spirulina platensis yang dikultivasi dengan media Walne menghasilkan biomassa kering sebesar 7,81 gram, lebih tinggi jika dibandingkan hasil kultivasi dengan media RI1+Urea. Komponen aktif yang terkandung pada kedua kultur S. platensis adalah golongan alkaloid, steroid, dan saponin. Flavonoid hanya ditemukan pada S. platensis hasil kultivasi dalam media pupuk Walne dan didapatkan kandungan total flavonoid sebesar 1,264% (b/b). Kedua kultur S. platensis memiliki aktivitas antioksidan namun tergolong rendah dimana nilai IC50 sebesar 1584,86 ppm pada media Walne dan 1984,34 ppm pada pupuk RI1+Urea. Uji potensi antihipertensi secara in vitro menunjukkan bahwa ekstrak S. platensis 4000 ppm berpotensi sebagai antihipertensi.
Keyword: antioksidan, fitokimia, flavonoid, hipertensi, ileum

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