Judul: Kapang Endofit dari Tumbuhan Pesisir Sarang Semut (Hydnophytum formicarum) dan Potensinya sebagai Antihiperglikemik
Abstrak: Epiphytic plant sarang semut Hydnophytum formicarum is one of the coastal plants that used as traditional medicine. Microbial endophytic can produce secondary metabolite compounds similar to compounds produced by plants of its host. The purpose of this research was to determine the activity of the endophytic fungi extracts to inhibit α-glucosidase. This research included isolation, cultivation, extraction, characterization, and assay the antihyperglycemic activity. The results showed 7 types of endophytic isolates included 1A, 1B, 2A, 2B, 3, 6A and 6B with a different characterization. Endophytic fungus 3 and 6B were the selected isolate based on antagonism test. A fungal growth patterns showed that the stationary phase of the fungus was on the 21th day until 24th day. Phytochemical test on extracts of mycelium and culture media showed that the extracts containing flavonoids and phenols hydroquinone. The screening results showed that the fungal broth extract with concentration of 20000 ppm had α-glucosidase inhibitor activity 72.63%.
Keyword: α-glucosidase enzyme activity, sarang semut, endophytic fungi, antihyperglycemic

Judul: Isolasi dan Uji Antimikrob Metabolit Sekunder Ekstrak Kultur Jamur Endofit AFKR-5 dari Tumbuhan Akar Kuning (Arcangelisia flava (L) Merr)
Abstrak: Endophytic fungi associated with medicinal plant were known to produce bioactive secondary metabolites similar to its host plant. This study aimed to obtain bioactive secondary metabolites as antimicrobial from endophytic fungi AFKR-5 associated with akar kuning plant from Bogor Botanical Garden. Methanol fraction of ethyl acetate extract from AFKR-5 culture in potato dextrose broth medium was capable to produce the bioactive secondary metabolites F3.4 (10.375 mg/L) with retention factor of 0.30. Antimicrobial activity test using Kirby-Bauer disc diffusion method showed that F3.4 was a broad antimicrobial spectrum on 3 pathogenic microbes, namely Gram-positive bacteria Staphylococcus aureus, Gram-negative bacteria Escherichia coli, and Candida albicans mold. The determination of minimum inhibitory concentration (MIC) and the minimum fungicidal concentration (MFC) were carried out with liquid microdilution method. F3.4 was the most potential with MIC value of 16 μg/mL against C. albicans, twice as stronger than the commercial antifungal Nystatin which was only fungistatic with MIC value of 32 μg/mL. F3.4 was fungicidal with MFC value of 32 μg/mL against C. albicans, so that it is potential to be developed as antimicrobial, especially antifungal.
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Judul: Analisis RSA dengan Penambahan Chinese Remainder Theorem untuk Mempercepat Proses Dekripsi.
Abstrak: RSA merupakan algoritma kunci publik yang keamanannya bertumpu pada kesulitan untuk memfaktorkan modulus n yang sangat besar, tetapi kelebihan ini mengakibatkan lambatnya waktu untuk menyelesaikan proses. Penambahan CRT pada RSA diperlukan untuk mengefisienkan kinerja RSA. Penelitian ini bertujuan untuk mempelajari kinerja RSA dari segi kecepatan dan keamanannya, serta menganalisis algoritmanya. Analisis kecepatan dilakukan dengan mengukur waktu kecepatan rata-rata enkripsi dan dekripsi RSA dan RSA-CRT. Analisis keamanan dilakukan melalui studi literatur. Dari hasil analisis algoritma, dapat ditarik kesimpulan bahwa RSA dan RSA-CRT memiliki kompleksitas yang sama untuk algoritma pembangkitan kunci dan proses enkripsi, yaitu O((lg n)3). Tetapi pada pembangkitan kunci RSA-CRT, ada bagian yang kompleksitasnya O((lg (n/2))2). Algoritma dekripsi RSA memiliki kompleksitas O((lg n)3), sedangkan RSA-CRT memiliki kompleksitas O((lg (n/2))3). Hasil ini dikuatkan oleh hasil implementasi yang memperoleh waktu dekripsi RSA-CRT yang lebih cepat dibandingkan waktu dekripsi RSA. Waktu rata-rata running time proses dekripsi RSA adalah 4211.79 ms, sedangkan pada RSA-CRT diperoleh running time rata-rata proses dekripsi 1372.44 ms. Kata kunci : RSA, RSA-CRT, Chinese Remainder Theorem.
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