Judul: Aktivitas Antioksidan serta Korelasinya dengan Kadar Fenolik dan Flavonoid Total pada Enam Tanaman Hias.
Abstrak: Senyawa antioksidan dapat diperoleh dari berbagai tumbuhan seperti halnya tanaman hias. Enam tanaman hias yaitu Aerva sanguinolenta (L.) Bulme, Hydrangea macrophylla (Thunb.) Ser., Torenia violacea (Azaola ex Blanco) Pennell, Allamanda cathartica L., Acalypha siamensis Oliv. Ex Gage, dan Anthurium crystallinum Linden & André dimaserasi menggunakan pelarut etanol yang dilanjutkan dengan menentukan kadar fenolik, dan flavonoid total serta aktivitas antioksidan menggunakan metode 2,2-difenil-1-pikrilhidrazil (DPPH), reducing power, dan cupric ion reducing antioxidant capacity (CUPRAC). Kadar fenolik dan flavonoid total tertinggi terdapat dalam tanaman bokor. Acalypha siamensis Oliv. Ex Gage memiliki aktivitas antioksidan tertinggi pada metode DPPH, reducing power, dan CUPRAC dengan nilai masing-masing 180.45; 202.17; dan 589.90 μmol trolox/g serbuk kering. Kadar fenolik dan flavonoid total tidak berkorelasi secara nyata dengan aktivitas antioksidan pada enam tanaman hias.
Keyword: aktivitas antioksidan, fenolik total, flavonoid total, tanaman hias

Judul: Pengukuran Aktivitas Antioksidan dengan Metode Cuprac, DPPH, dan Frap serta Korelasinya dengan Fenol dan Flavonoid pada Enam Tanaman
Abstrak: Oxidative stress is the imbalance condition between free radical and antioxidants that can cause oxidative damage in cell, tissues, organ, accelerates the aging process, and emergence of diseases. This study aims to determine the antioxidant capacity of 6 herbs, and the relationship between phenol and flavonoids content with their antioxidant activity and relationship between phenol and flavonoids content in the ethanol extract of some Indonesian herb, there are Orthosiphon stamineus, Sonchus avensis, Sida rhombifolia, Guazuma umifolia, Andrographis paniculata, and Parkia biglobosa. The measurement of antioxidant activity use 3 methods, that are CUPRAC (cupric ion reducing antioxidant capacity), DPPH (2,2-diphenyl-1-pickrylhidrazyl), and FRAP (ferric reducing antioxidant power). The research of the six herbs showed antioxidant activity. Statistic test from three method antioxidant showed that measurement antioxidant activity with CUPRAC, DPPH, and FRAP gave a significantly different result, but CUPRAC and FRAP give the same response of the six herbs. The phenol has no correlation with flavonoids content but have highly correlation with their antioxidant activity. Flavonoids have no correlation with antioxidant activity.
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Judul: Pengukuran Kecepatan Gelombang Seismik Laut 2D menggunakan Prestack Time Migration dengan Metode Kirchhoff
Abstrak: Seismic method is a method used in geophysics to study the structure of earth surface and below using sounds. Seismic waves are emitted by the transmitter into the sea to the subsurface ocean floor. Reflected wave is returned subbottom to the hydrophone and contains information on the elastic parameters of the subbottom. The method used in this study is using the Prestack Time Migration (PSTM) with the Kirchhoff method has the advantage to increase the Signal/Noise data and be able to improve data quality including time, angles, and distances. This study was conducted to analyze the speed of default parameters and the root mean square (rms) using Prestack Kirchhoff Time Migration method. Cross-sectional results of the two treatments were applied in seismic data line 13-1 in the Gulf of Bone waters, South Sulawesi. In the seismic section are sequence boundaries of toplap, downlap, normal and reverse faults event. Based on the results obtained, cross prestack time migration using the rms velocity analysis (picking velocity) gives better results compare to the cross section of prestack time migration using default parameters.
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