Judul: Keanekaragaman udang air tawar di danau Kerinci Provinsi Jambi
Abstrak: Freshwater prawn is a crustacean member which has an important role in maintaining the balance of freshwater ecosystem. The study of freshwater prawn was conducted in Lake Kerinci, Jambi Province. The aim of this research was to study the diversity of the freshwater prawn in the Lake Kerinci. The sampling was conducted at 10 stations around the lake. Each station was sampled for 60 minutes, with a length of 10 meter along the edge of the lake. There were 3 species of freshwater prawn found in the Lake Kerinci, i.e., Macrobrachium lanchesteri (289 specimen), M. pilimanus (39 specimens), and M. sintangense (10 specimens). The highest diversity index from the 10 observed stations was 0.96 and the lowest was 0. The highest diversity index was found in varied habitat, while the lowest diversity index was found in one type habitat. Macrobrachium lanchesteri, the dominant species, was mainly found in slow water current, open area, and area occupied with water plants. Macrobracium pilimanus was found in rocky habitat with fast water current, while M. sintangense was found in shallow muddy water with slow water current and sandy substrate.
Keyword: 

Judul: Keanekaragaman udang air tawar di Danau Singkarak
Abstrak: Udang air tawar termasuk dalam subfilum Crustacea, ordo Decapoda, subordo Caridea. Udang air tawar memiliki peranan penting dalam perairan untuk menjaga kestabilan ekosistem. Penelitian keanekaragaman udang air tawar ini bertujuan untuk mendapatkan informasi mengenai jenis-jenis udang air tawar yang berada di Danau Singkarak. Sampling dilakukan pada dua habitat, yakni litoral dan tumbuhan air secara purposive sampling. Pengambilan sampel udang dilakukan dengan menggunakan alat hand net dan botol sampel. Identifikasi spesies dilakukan berdasarkan ciri morfologi (karapaks, rostrum, segmen abdominal dan pereiopod) mengikuti panduan kunci identifikasi udang air tawar serta identifikasi molekular menggunakan DNA barkode. Terdapat tiga spesies yang ditemukan di Danau Singkarak yaitu Macrobrachium horstii, Macrobrachium meridionalis dan Macrobrachium lanchesteri. Penelitian ini pertama kali melaporkan keberadaan ketiga spesies ini di Danau Singkarak. Macrobrachium lanchesteri merupakan spesies dengan jumlah paling banyak ditemukan.
Keyword: Diversity,, Macrobrachium, freshwater prawn, Singkarak Lake

Judul: Pembuatan Film Tipis Cu2ZnSnS4 sebagai Lapisan Penyerap Cahaya pada Sel Surya Menggunakan Metode Elektrodeposisi
Abstrak: Thin film of Cu2ZnSnS4 (CZTS) is an alternative semiconductor used as light absorber layer on solar cell. CZTS can replace silicon that commonly used as commercial semiconductor. The advantage of using CZTS as absorber layer is due to the abundance of its chemical composer on earth, and its high value of absorption coefficient. The absorber layer was made by using electrodeposition method on ITO glass substrates. The films were deposited at room temperature using potentiostatic mode with a potential of –1.05 V for 30, 45, and 60 minutes. After that, the films were annealed at two different temperatures, 180 ºC and 500 °C, for 45 minutes in N2/H2S atmosphere. Based on X-ray diffraction analysis, the polycrystalline thin film obtained fall into kesterite crystal phase. This type of crystal was obtained when the CZTS was annealed at 500 °C in H2S/N2 atmosphere. The value of optical band gap energy for the CZTS thin film was 2.2 eV with the film thickness about 1.228–6.366 μm. The sample of CZTS with electrodeposition time of 45 minutes and annealing temperature of 500 °C showed the best result and in conformity with absorber layers criteria for solar cells.
Keyword: semiconductor, ITO glass, CZTS thin film, electrodeposition