Judul: Keanekaragaman Jenis Ikan Air Tawar di Sungai-sungai yang Berasal dari Gunung Salak
Abstrak: Approximately 50 river flow from Salak Mountain passed Bogor and Jakarta is Ciliwung and Cisadane river. Sampling period from January until March 2012, on 11 sampling sites of 7 rivers. We found 6 ordo, 9 family, and 13 species of fish. Ten species are native fish and 3 species are introduction fish. Cypriniformes are dominant ordo found at all sampling sites. Ordo Cypriniformes with 2 family, is Cyprinidae (Barbodes gonionotus, Rasbora aprotaenia, Puntius sp., and Puntius binotatus) and Balitoridae (Nemacheilus fasciatus). Ordo Siluriformes with 3 family, is Clariidae (Clarias teijsmanni), Loricariidae (Hypostomus plecostomus), and Sisoridae (Glyptothorax platypogon). Ordo Perciformes that found one family Channidae (Channa striata), Ordo Beloniformes found one family Hemiramphidae (Dermogenys pusilla), Ordo Synbranchiformes is family Mastacembelidae (Macrognathus maculatus), Ordo Cyprinodontiformes with 2 species (Xiphophorus helleri and Poecilia reticulata).
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Judul: Keanekaragaman Udang Air Tawar di Sungai yang Berhulu di Gunung Salak, Jawa Barat
Abstrak: Udang air tawar merupakan anggota Crustacea yang banyak ditemukan di seluruh dunia termasuk Indonesia. Udang air tawar yang paling banyak ditemukan di Indonesia ialah anggota famili Palaemonidae dan Atydae. Anggota famili Palaemonidae yang umum ditemukan yaitu dari genus Macrobrachium, sementara dari famili Atydae yaitu dari genus Caridina. Penelitian ini bertujuan mengeksplorasi kembali untuk mengetahui keanekaragaman udang air tawar di sungai Gunung Salak berdasarkan sebaran spasialnya. Metode yang digunakan pada penelitian ini yaitu purposive sampling dan road sampling yang di dasarkan pada kemudahan memperoleh data. Hasil penelitian yang dilakukan yaitu ditemukan 4 spesies udang air tawar, 3 dari genus Macrobrachium dan 1 dari Caridina. Spesies dari genus Macrobrachium yaitu M. pilimanus, M. sintangense, dan M. lanchesteri. Sementara dari genus Caridina yaitu Caridina propinqua. Keberadaan udang air tawar tidak dipengaruhi oleh faktor penghalang seperti bendungan, perumahan, jembatan, curug, dan kebun bambu, tetapi dipengaruhi oleh faktor ketinggian tempat.
Keyword: Faktor penghalang, Gunung Salak, keanekaragaman, ketinggian, udang air tawar

Judul: Gamma Ray Irradiation on UHMWPE and HDPE to Increase Tibial Tray Mechanical Properties
Abstrak: Ultrahigh molecular weight polyethylene (UHMWPE) is a polymer that is widely used in the manufacture of tibial tray, but it is very expensive. Therefore, high density polyethylene (HDPE) was developed for the manufacturing of tibial tray because the price is lower and has similar properties to UHMWPE. HDPE was made by two methods, namely hot pressing method and heating method, but UHMWPE wass made only by hot pressing method. Tibial tray film of HDPE and UHMWPE from both methods were irradiated with various doses of gamma rays 0, 100, 200, 300 and 500 kGy. The polymers were analyzed for surface microstructure, hardness , tensile strength, elongation at break percentage, and degree of crystallinity. The higher the dose of irradiation the higher the hardness and the degree of crystallinity, but not for the tensile strength and elongation at break percentage. Both polymers were not able to increase mechanical properties in those irradiation doses range because crosslink formation is inhibited by the presence of oxygen that causes chain scission. HDPE hardness enhancement by hot pressing method was close to
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