Judul: Pembuatan Komposit Zeolit Cikalong-Serat Nilon 6 sebagai Adsorben Logam Fe dan Mn
Abstrak: Komposit antara zeolit asal Cikalong dan serat polimer nilon 6 telah dibuat dengan nisbah 1:1. Komposit dengan nilon 6 diharapkan akan memperbaiki kemampuan penjerapan, karena adanya atom nitrogen pada gugus amida yang dapat berikatan dengan logam. Difraktogram sinar-X menunjukkan kesamaan puncak difraksi zeolit Cikalong dengan pangkalan data program PCDFWIN dengan nomor arsip 29-1257 yang merupakan jenis mordenit. Puncak nilon 6 pada komposit teridentifikasi pada sudut difraksi 2θ 20.85° dan 23.57°. Mikrograf elektron pemayaran memperlihatkan bahwa zeolit hasil aktivasi dan komposit memiliki bentuk pori yang tidak homogen. Uji adsorpsi dengan metode permukaan respons tidak menunjukkan kenaikan signifikan kapasitas adsorpsi sampel komposit terhadap Fe(II) dan Mn(II). Kapasitas optimum adsorpsi sampel komposit diperoleh pada konsentrasi awal 6 ppm, waktu adsorpsi 30 menit, dan bobot adsorben 0.1 g dengan nilai kapasitas adsorpsi tertinggi diperoleh pada adsorpsi Mn(II)
Keyword: Cikalong’s zeolite, composite, Fe, Mn, nylon 6

Judul: Komposit Oksida Besi Magnetit-Zeolit Cikembar Sebagai Adsorben Cr(III) dan Cr(VI)
Abstrak: Iron oxide and iron oxide-zeolite magnetite composites have been prepared by co-precipitation method at temperature 70 ˚C. The magnetite composite were prepared with ratios of 1:1, 1:2, and 1:3 by weight. The magnetite composites were made to obtain an adsorbent that can be responsive to magnetic field so that it can be separated by simple magnetic procedure. The result from X-ray diffraction characterization showed a similarity of diffraction peak of zeolite with specific peak in PCDFWIN program database no 29-1257, which was mordenit. In addition, iron oxide and magnetite composites had a same peak with specific peak in PCDFWIN program database no 19-0629, which was iron oxide of magnetite (Fe3O4). Characterization using scanning electron microscope showed microstructure of zeolite that have small pores, while magnetite composite revealed iron oxide particles that cover and surrounded the pores of the zeolite. Adsorption experiment using surface response method showed that adsorption capacity of Cr(III) and Cr(VI) with composite did not increase significantly. However, the composite samples were capable in separating the composite adsorbent from the adsorbate medium using permanent magnet. The optimum capacity of adsorption occurred in 0.5 g of adsorbent, adsorption time of 12 hours, and initial concentration of 60 ppm
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Judul: Posisi Filogenetik Kura-Kura Carettochelys Insculpta  (Reptillia: Testudinata)
Abstrak: Carettochelys insculpta is an endemic freshwater turtle of southern Papua and northern Australia. Phylogenetic position of this turtle is remain unresolved until now. Most of the research conducted show close relationships of C. insculpta and members of Trionychidae family. However, some of the research show distance between C. insculpta and members of Trionychidae family. This research is conducted to analyze phylogenetic relationship between C. insculpta and other members of Testudinata using 12S rRNA, 16S rRNA, and both gene as markers. DNA samples were obtained from three different organisms of C. insculpta. Two species used as outgroups were Alligator mississippiensis and Iguana iguana. Phylogenetic analysis was carried out using Neighbor-Joining method with Felsenstein 1981 (F81) modeltest. A polytomy tree of Testudinata was produced by using 12S rRNA gene. However, analysis using 16S rRNA and both genes as markers confirmed that C. insculpta was located between the Chelonidae and the Trionychidae family.
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