Judul: Fraksionasi Ekstrak Kemedangan Gaharu Aquilaria microcarpa Hasil Inokulasi Berpotensi Antioksidan
Abstrak: Aquilaria microcarpa is an agarwood producing tree which is potential as an antioxidant resource. The objectives of this research were to determine the most active antioxidant fraction in the inoculated kemedangan A. microcarpa agarwood species and to characterize the functional groups contained in the fraction. The antioxidant activity analysis of ethyl acetate and methanol extracs showed the 50% inhibition concentration (IC50) value of 239 and 185 μg/mL, respectively. Methanol extract contained flavonoid, steroid, alkaloid, and phenolic compounds. The methanol extract was further fractionated using column chromatography with gradient elution system that yielded 12 fractions. According to the analysis, the fraction eluted with dichloromethane-ethyl acetate (9:1) was obtained as the most active fraction as antioxidant activity of 165 μg/mL IC50 value. The infrared spectrum of this fraction showed the presence of phenolic functional group that expected responsible for the antioxidant activity, with absorption bands of OH stretch at 3306 cm-1, CO stretch at 1246 cm-1, and aromatic C=C stretch at 1462 and 1597 cm-1.
Keyword: infrared spectra, IC50, fractionation, Aquilaria microcarpa, Bogor Agricultural University (IPB)

Judul: Aktivitas Antioksidan Ekstrak Kemedangan Pohon Penghasil Gaharu Hasil Inokulasi Jenis Aquilaria microcarpa dan Gyrinops verstegii
Abstrak: Agarwood is a non-timber forest product commodity which is traded because of its distinctive fragrance. Kemedangan from gaharu was assumed to have secondary metabolites that are potential as antioxidant. This study aimed to investigate the phytochemicals, toxicity and antioxidant activites of kemedangan from Aquilaria microcarpa and Gyrinops verstegii trees with and without inoculation by Fusarium fungi. Phytochemical assay of ethyl acetate and methanol extract revealed the presence of phenolics, flavonoids, triterpenoids, and alkaloids. The toxicity evaluation using brine shrimp lethality test showed that all extracts were potential as bioactive compounds with 50% lethal concentration value ≤1000 ppm. Antioxidant activities which were measured by using 2,2- diphenyl-1-picrylhidrazyl free-radical scavenging method showed that all extracts had antioxidant activities with 50% inhibition concentration value ≤200 ppm except A. microcarpa ethyl acetate extract from inoculated samples with IC50 of 411 ppm.
Keyword: agarwood, antioxidant, Aquilaria, Gyrinops, kemedangan

Judul: Domain name system dinamis dengan protokol dinamid versi 1.02
Abstrak: Pengalamatan suatu host di jaringan TCP/IP dilakukan dengan menggunakan alamat IP. Sulit sekali bagi manusia untuk mengingat semua host di jaringan lengkap dengan alamat IPnya. Karena itu dibuatlah pemetaan nama ke alamat IP ke dalam suatu file HOST. TXT. Namun dengan cara ini, setiap host akan memiliki salinan HOST.TXT yang sama yang berarti adanya redundansi yang tidak perlu. Karena itu dibuat mekanisme Domain Name System (DNS) yang merupakan database tersebar yang berisi pemetaan nama ke alamat IP. Tiap host hanya perlu menghubungi server khusus yang menyimpan database ini bila ingin meresolve suatu nama host ke dalam alamat IP. Namun database akan selalu berubah bila host di dalam domain menggunakan sistem IP dinamis. DNS Dinamis mengatasi permasalahan ini. DNS Dinamis berfungsi sebagai perantara antara host client dengan name server. Bila client tersambung ke jaringan dengan alamat IP dinamis, maka entri nama host tersebut pada name server akan diupdate sesuai dengan alamat IP yang dimiliki host tersebut. Protokol dinamid digunakan sebagai tata cara pelaksanaan segala perubahan pada name server dan tata cara komunikasi antara server DNS Dinamis dengan client.
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