Judul: Antioksidan: Jenis, Sumber, dan Perannya
Abstrak: Pola hidup yang tidak sehat dan stres dapat mengganggu metabolisme tubuh termasuk keseimbangan antara radikal bebas dan antioksidan di dalam tubuh. Radikal bebas merupakan suatu atom atau molekul yang memiliki elektron yang tidak berpasangan pada orbit terluarnya. Kondisi ketidakseimbangan antara radikal bebas yang lebih banyak dibandingkan dengan antioksidan dapat menyebabkan stres oksidatif. Stres oksidatif dapat dicegah dengan antioksidan. Studi pustaka ini bertujuan untuk mengetahui tentang jenis-jenis antioksidan, sumber antioksidan, serta mempelajari peran dari antioksidan. Informasi studi pustaka yang digunakan berasal dari media ilmiah. Antioksidan merupakan suatu zat yang dapat memperlambat, menunda, dan atau mencegah terjadinya proses oksidasi, serta dapat menetralisir radikal bebas. Jenis antioksidan dibedakan menjadi dua berdasarkan sumbernya, yaitu antioksidan endogen dan antioksidan eksogen. Antioksidan endogen merupakan antioksidan yang dihasilkan dari dalam tubuh yang antara lain berupa antioksidan enzimatik primer, yaitu glutation peroksidase, katalase, dan superoksida dismutase. Antioksidan eksogen merupakan antioksidan yang berasal dari luar tubuh, contohnya senyawa alkaloid, polifenol, isoflavon, saponin, tanin, vitamin C, vitamin E dan lain-lain yang terdapat dalam bahan pangan dan sumber bahan lainnya. Antioksidan berperan penting dalam meningkatkan enzim pertahanan terhadap stres oksidatif, pencegahan pada komplikasi, dan mengontrol kadar glukosa darah., An unhealthy lifestyle and stress can disrupt the body's metabolism, including the balance between free radicals and antioxidants in the body. Free radicals are atoms or molecules that have an unpaired electron in their outer orbit. The condition of an imbalance between free radicals that are more than antioxidants can cause oxidative stress. Oxidative stress can be prevented with antioxidants. This literature study aims to find out about the types of antioxidants, sources of antioxidants, and to study the role of antioxidants. The literature study information used comes from scientific media. Antioxidants are substances that can slow down, delay, and or prevent the oxidation process, and can neutralize free radicals. Types of antioxidants are divided into two based on the source, namely endogenous antioxidants and exogenous antioxidants. Endogenous antioxidants are antioxidants produced from within the body which include primary enzymatic antioxidants, namely glutathione peroxidase, catalase, and superoxide dismutase. Exogenous antioxidants are antioxidants that come from outside the body, for example alkaloid compounds, polyphenols, isoflavones, saponins, tannins, vitamin C, vitamin E and others found in food and other sources of material. Antioxidants play an important role in increasing defense enzymes against oxidative stress, preventing complications, and controlling blood glucose levels.
Keyword: Antioksidan, penyakit degeneratif, radikal bebas

Judul: IPB (Bogor Agricultural University)
Abstrak: Kondisi stres menyebabkan jumlah radikal bebas berlebih dan dapat menimbulkan kerusakan sel. Tubuh secara normal mempunyai mekanisme pertahanan terhadap radikal bebas yaitu antioksidan. Antioksidan berfungsi untuk menetralkan radikal bebas. Superoksida dismutase (SOD) adalah salah satu enzin antioksidan intrasel yang melindungi sel dari serangan radikal bebas. Salah satu antioksidan ekstrasel yang dapat melindungi sel dari serangan radikal bebas adalah a[alfa]-tokoferol.
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Judul: 3D model reconstruction using aerial photo to measure object height
Abstrak: 3D reconstruction, especially for height extraction, using digital aerial photos taken from a non-metric camera and Unmanned Aerial Vehicle (UAV) is a challenging study. The purposes of the study are to determine the factors affect the accuracy of an object’s height reveal from a 3D model and establish procedures to deliver the optimal result. Two or more overlapping aerial photos can be constructed into the 3D model by applying the principles of collinearity and epipolar geometry using 3D reconstruction algorithm. Due to the instability of non-metric digital camera, the camera must be calibrated before 3D reconstruction is processed, in that way the quality of spatial extraction can be then measured. The study is conducted using 24 megapixels resolution Sony NEX7 digital camera and Hexacopter UAV. UAV was flown to a height of 50 m, 60 m and 70 m and placed at a certain position in order to get some height variations of camera. Camera Calibration Toolbox is utilized to calculate intrinsik parameters of the camera and a specific program is developed using MATLAB in order to build the 3D model and to obtain the object’s height. The result validation is done by comparing the height from 3D model with that one measured using Electronic Total Station. The accuracy of the object’s height up to 1 mm successfully achieved, with the largest height prediction error reaches 15.2 cm at 70 m flying height above ground level and average percentage error 4.07 for 20 objects.
Keyword: 3D reconstruction, collinearity, epipolar geometry, UAV