Judul: Pengaruh Lama Penyimpanan Ekstrak Daun Lindur (Bruguiera gymnorrhiza) Dalam Botol Berbeda Warna Terhadap Aktivitas Antioksidan
Abstrak: Daun lindur mengandung senyawa metabolit sekunder yang dapat bersifat antioksidan, namun mudah mengalami penurunan akibat cahaya matahari. Oleh karena itu penelitian ini bertujuan menentukan pengaruh lama penyimpanan ekstrak daun lindur yang disimpan dalam botol bening, biru, dan coklat dengan disinari lampu ultraviolet (UV) blue light 356 nm. menggunakan metode 1,1-difenil-2-pikrilhidrazil (DPPH) Nilai IC50 ekstrak etanol daun lindur awal sebesar 33,72 mg/L, penyimpanan 7 hari pada botol bening 81,29 mg/L, botol biru 71,24 mg/L, botol coklat 62,50 mg/L; penyimpanan 14 hari pada botol bening 102,15 mg/L, botol biru 89,73 mg/L, botol coklat 74,76 mg/L. Aktivitas antioksidan terbaik diperoleh pada ekstrak etanol daun lindur yang disimpan dalam botol coklat berdasarkan persentase peningkatan nilai IC50 terendah.
Keyword: antioksidan, ekstrak etanol daun lindur, DPPH, IC50, warna botol

Judul: Effect of UV Light and Different Color Bottle Packaging on Antioxidant Activity of Lindur Leaf Bruguiera gymnorrhiza
Abstrak: The quality of antioxidant materials such as those found in lindur leaves (Bruguiera gymnorrhiza) is greatly influenced by proper packaging and storage techniques, because they are very susceptible to damage due to external environmental influences. The study is aimed to determine the effect of UV exposure and packaging of dried lindur leaves in bottles of different colors (clear, brown, blue) on the quality of the antioxidant compound content of lindur leaves during storage. The content of antioxidant compounds during storage and UV exposure was observed through the DPPH method which would produce IC50 values so that the classification of the strength of the antioxidant activity of lindur leaves was obtained. The results showed that the color of the storage bottle and UV light caused the antioxidant activity of lindur leaves to decrease. The best storage bottle color treatment in the IC50 value was obtained in brown bottles 85.72 ± 1.35, blue 109.78 ± 1.31, and clear 131.42 ± 6.38. UV light exposure and storage bottle color could affect the antioxidant activity value during storage.
Keyword: antioxidant, lindur leaf, UV light, bottle color

Judul: Rancang Bangun Jaringan Peer-to-Peer Webcam dengan Menggunakan Protokol JXTA
Abstrak: Internet is a media for exchange of information and data. Network used on the internet today still implementing client-server network model. Clients need the information must related to the server and request the information needed. System established client-server network is a centralized system and can potentially commercial. If the server was down, the information requested by the client can’t be given and the whole network will be disrupted. Peer-to-peer network is set up to reduce the problem of client-server. Peer-to-peer will not be affected to the problems that occur in each host. If one host to crash or be unable to connect, the network was still able to run. In this research we develop an application using JXTA protocol as a framework for peer-to-peer and API JMF as an additional feature integrated on a JXTA application. API JMF is used to access webcam and produces images or videos. Video or image files generated by the API JMF can be distributed directly into the peer-to-peer network which has been formed. Other connected peers can directly search and download the video files or images. Downloaded files will be directly stored into a local folder on each peer. Files downloaded can be directly redistributed by every peer. If one peer dies, the other peer can share the data from the dead peer after the file is downloaded from the source peer.
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