Judul: Potensi Ekstrak Daun Cengkeh dan Eugenol dalam Memodulasi Apoptosis melalui Kajian Molecular Docking
Abstrak: Apoptosis adalah proses kematian sel yang dapat digunakan sebagai salah satu upaya menghindari penyakit seperti kanker, gangguan neurodegeneratif, autoimun dan penyakit kardiovaskular. Mekanisme apoptosis dapat diinduksi dengan adanya senyawa bioakif yang kaya antioksidan. Eugenol merupakan senyawa bioaktif yang banyak terdapat pada cengkeh (Syzygium aromaticum) dan memiliki aktivitas antioksidan. Dalam penelitian ini, potensi induksi apoptosis pada sel khamir yang diberi ekstrak cengkeh dianalisis. Apoptosis pada khamir (Saccharomyces cerevisiae) dapat diamati melalui terbentuknya koloni petite. Potensi pengikatan senyawa yang terkandung di dalam ekstrak cengkeh yakni eugenol terhadap regulator kunci lintasan apoptosis, protein YCA1 juga dianalisis melalui pendekatan molecular docking (penambatan molekuler). Penelitian ini bertujuan menentukan aktivitas modulasi apoptosis ekstrak kasar daun cengkeh pada S. cerevisiae serta menganalisis potensi pengikatan eugenol sebagai senyawa aktif daun cengkeh terhadap protein YCA1. Sebanyak 22 publikasi terkait aktivitas senyawa bioaktif dan tanaman yang memodulasi apoptosis menunjukkan bahwa ekstrak cengkeh memiliki potensi dalam memodulasi apoptosis. Hasil penelitian menunjukkan bahwa ekstrak kasar daun cengkeh dengan konsentrasi 500 ppm meningkatkan frekuensi koloni petite hingga 94,2% pada S. cerevisiae. Senyawa bioaktif eugenol mampu mengikat YCA1 dengan afinitas -4,4 kkal/mol yang diduga dapat memicu terjadinya apoptosis.
Keyword: apoptosis, docking, eugenol, petit

Judul: Kemampuan Ekstrak Dedaunan Berpotensi Antioksidan Untuk Memodulasi Apoptosis Pada Sel Khamir.
Abstrak: One of the causes of cardiovascular disease is atherosclerosis. Some of medicinal herbs extracts which are reported to have anti atherosclerotic property are Guava leaves extract, Jati Belanda leaves extract, and Salam leaves extract. Apoptosis occures in atherosclerosis lesions intima. So this research is to determine that the capability of some herbal extracts to modulate apoptosis in yeast cells. For that purpose, yeast cells are used as model, as they will become small colonies (petite colonies) when apoptosis is induced. Yeast cells were incubated into 50 ppm, 100 ppm, 200 ppm, 1000 ppm, and 2000 ppm of each extracts, previously had been enriched in sterile YEPD and Petite Broth. On day 3 and 4, yeast cells were spread into YEPD and Petite media, and then petite frequency was counted directly from the plate. Promising extract for apoptosis stimulation on yeast cells is the 100 ppm Salam leaves extracts has petite frequency of 97.90%, whereas the 1000 ppm and 2000 ppm petite frequency are respectively 94.45% and 91.99%. No petite colony was formed on other extracts. Guava leaves extracts at 100 ppm inhibits apoptosis on yeast cells.
Keyword: 

Judul: Kajian Atmosfer Bawah Wilayah Tropis dan Subtropis
Abstrak: Planetary Boundary Layer is the lowest part of the atmosphere directly affected by the earth’s surface and responds to surface forcings within a time period of hourly to daily. The thickness of boundary layer varies over space and time, ranging from hundreds of meters to a few kilometers. The objective of this study consist of the analysis of Boundary Layer based on diurnal and nocturnal vertical profiles of meteorological properties and identification of characteristics pertaining to tropical atmosphere (represented by Soekarno-Hatta (6.110S, 106.650E), Polonia (3.560N, 98.680E), and Da Nang (16.030N, 108.200E) stations) and subtropical atmosphere (represented by Perth (31.930S, 115.960E), Nanjing (32.000N, 118.800E), and Hakasskaja (43.780N, 87.620E) stations). Virtual potential temperature, specific humidity, wind speed and direction, atmospheric stability, and Bulk-Richardson number are used to estimate the boundary layer thickness. Vertical profile of the virtual potential temperature and specific humidity are used to determine the Mixed Layer heights during the day and Residual Layer heights during the night. On the other hand, the mean value of Turbulent Flow Thickness is derived from the vertical profile of the Bulk-Richardson number (RiB). Analytical results of this study revealed that Mixed Layer height in the tropical atmosphere varies in a range from 260 m to 1410 m, Residual Layer height varies in a range from 267 m to 925 m, whereas the Turbulent Flow Thickness variation is confined between 0 m to 335 m. In subtropical atmosphere Mixed Layer height varies in a range from 101 m to 1483 m, Residual Layer height varies in a range from 121 m to 1276 m, whereas the Turbulent Flow Thickness variation is confined between 0 m to 769 m. This study also revealed that, except during summer, Mixed Layer Heights in the tropics are normally higher than in the subtropics.
Keyword: