Judul: Pengaruh Kerusakan Penutupan Vegetasi Rawa Gambut Terhadap Komunitas Ikan di Sungai Merang, Kabupaten Musi
Abstrak: Vegetation around Merang River is the last peat swamp forest in South Sumatera. Before the year of 2000, forest usage rights/licences (HPH) activity was the main cause destroyig peat swamp vegetation but recently illegal logging is the main factor of ecosystem and fish community damage. The aim of this reseach was to observe the effect of vegetation damage on fish community. Method used was field survey to collected basic data of vegetation, soil, water quality, animal and fisheries biology. The ecosystem of peat swamp forest in Merang River was degradated because of HPH activity, since 1989 until 2002. It made the peat swamp forest became secondary forest gaining 90% from the original ecosystem. At least 21 kinds of trees with medium diversity in this forest. The most of important value index were on manggris, punak and rengas types. The sum of type and individu of vegetation and fish in upstream area were more than borderland and below areas. The diversity of fish was medium with sum of fish type above 40 type. Linier Regression Analysis showed that vegetation cover had a positive impact to fish population. The vegetation covered channel area including seep and floodland area. Often the fish was not afford to live in the opened area, without the covering vegetation. Another factor affecting to fish population was water quality. Illegal logging activity caused oxidation of pirit to sulphate acid. Based on canonic variable, the higher alight, the lower debit and the low turbidity made the more uniform the fish. The other factor affecting fish population was electricity elusive kit to catch fish by poeple .
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Judul: Biodiversity of Protected Freshwater Stingray in Musi River, South Sumatera
Abstrak: Sungai Musi memiliki keanekaragaman hayati yang tinggi. Sungai Musi merupakan salah satu habitat ikan pari air tawar yang keberadaannya sangat langka dan hingga saat ini informasinya masih terbatas. Penelitian ini bertujuan untuk mendeskripsikan dan menganalisis keanekaragaman spesies ikan pari air tawar di Sungai Musi bagian tengah Provinsi Sumatera Selatan. Metode yang digunakan untuk mendeskripsikan ikan pari air tawar menggunakan pendekatan morfologis. Adapun keanekaragaman ikan pari air tawar dianalisis menggunakan pendekatan indeks keanekaragaman, indeks kemerataan, dan indeks dominansi. Ikan pari air tawar yang didapatkan sebanyak 42 ekor, yang terdiri dari enam spesies (Fluvitrygon signifer, Fluvitrygon oxyrhynchus, Fluvitrygon cf. oxyrhynchus, Fluvitrygon kittipongi, Pastinachus stellurostris, dan Urogymnus polylepis). Ikan pari air tawar di Sungai Musi memiliki kesamaan karakteristik, yaitu warna cakram dorsal kecoklatan hingga kehitaman, ekor sangat panjang seperti cambuk, terdapat 2 duri sengat, dan memiliki mata yang kecil. Hasil analisis menunjukkan bahwa keanekaragaman spesies ikan pari air tawar di Sungai Musi memiliki nilai H’= 1,38 dengan persebaran yang merata dan tak ada spesies yang mendominasi., The Musi River has a high biodiversity. The Musi River is one of the habitats of freshwater stingrays whose existence is very rare and until now the information is still limited. This study aims to describe and analyze the diversity of freshwater stingray species in the middle part of Musi River, South Sumatra Province. The method used to describe freshwater stingrays uses a morphological approach. The diversity of freshwater stingrays was analyzed using the diversity index, evenness index, and dominance index approaches. There were 42 freshwater stingrays that obtained during research, consisted of six species (Fluvitrygon signifer, Fluvitrygon oxyrhynchus, Fluvitrygon cf. oxyrhynchus, Fluvitrygon kittipongi, Pastinachus stellurostris, and Urogymnus polylepis). Freshwater stingrays in the Musi River have similar characteristics, namely brownish to blackish color of the dorsal disc, very long whip-like tail, 2 stinging spines, and small eyes. The analysis showed that the species diversity of freshwater rays in the Musi River has a value of H'= 1.38 with an even distribution and no dominant species.
Keyword: diversity, freshwater stingray, Musi River, protected

Judul: Struktur Kristal dan Ikatan Molekul Lithium Okisda dan Niobium Pentaoksida
Abstrak: Lithium oksida dan niobium pentaoksida merupakan material yang digunakan dalam pembuatan lithium niobat. Pendugaan struktur kristal menggunakan perbandingan jari-jari ionik menunjukkan bahwa lithium oksida dan mobium pentaoksida memiliki struktur oktahedron, sedangkan hasil karakterisasi XRD menunjukkan lithium oksida memiliki struktur kubik dengan parameter kisi 4.617 Å dan niobium pentaoksida memiliki struktur monoklinik dengan parameterkisia sebesar 18.5070 Å, b sebesar 7.7679 Å dan c sebesar 17.5994 Å. Hasil karakterisasi FTIR, lithium oksida dengan gugus Li-O memiliki kontanta pegas 641.77 Nm¹ pada bilangan gelombang serapan 864 cm-1. dan 1088 cm-1.. Sedangkan gugus Li-O-Li memiliki konstanta pegas 537.67 Nm¹ pada bilangan gelombang serapan 1003 cm-1.dan 1435 cm-1.. Niobium pentaoksida dengan gugus fungsi Nb-O memiliki konstanta pegas 1200 Nm pada bilangan gelombang serapan 1222 cm-1., gugus fungsi Nb-O memiliki konstanta pegas 522 cm¹ pada bilangan gelombang serapan 809 cm-1, dan gugus fungsi Nb-O-Nb memiliki konstanta pegas 443 Nm¹ pada bilangan gelombang serapan 509 cm-1 dan 736 cm-1…
Keyword: Crystal Structure, Lithium Oxide, Molecule Bond, Niobium Pentaoxide, Spring Constant, Daerah serapan, Sinar inframerah, Karakterisasi XRD, Kazrakterisasi FTIR