Judul: Karakteristik sperma udang vaname Litopenaeus vannamei pada beberapa periode rematurasi
Abstrak: Seiring bertambahnya umur induk jantan, jumlah telur yang dibuahi meupun yang menetas mengalami penurunan. Oleh karena itu perlu dilakukan pengamatan terhadap karakteristik sperma mulai dari awal dihasilkan hingga beberapa periode rematurasi pada individu udang vaname yang sama sehingga dapat diketahui kecenderungan terjadinya perubahan kualitas sperma.
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Judul: Effect of Injection of Karamunting Melastoma malabathricum Leaf Extract on Sperm Quality of Male Vannamei Shrimp Litopenaeus vannamei Broodstock
Abstrak: Induk udang vaname jantan dengan kualitas sperma yang optimal sangat diperlukan untuk menunjang produktivitas pasokan benih unggul. Salah satu tanaman yang berpotensi untuk meningkatkan kualitas sperma pada udang adalah karamunting (Melastoma malabathricum L.). Penelitian ini bertujuan menguji pengaruh injeksi ekstrak daun karamunting terhadap kualitas sperma induk udang vaname jantan. Induk udang vaname jantan diberi perlakuan dengan diinjeksi akuades sebagai kontrol, serta injeksi ekstrak daun karamunting dengan dosis 7,5 mg/kg bobot tubuh (DK7,5), 10 mg/kg bobot tubuh (DK10,0), dan 12,5 mg/kg bobot tubuh (DK12,5). Injeksi dilakukan setiap lima hari sekali selama 20 hari pemeliharaan. Perlakuan injeksi ekstrak daun karamunting mengalami peningkatan jumlah sel sperma relatif dibandingkan kontrol. Abnormalitas sel sperma terendah diperoleh pada perlakuan DK7,5 hari ke-20 sebesar 2,04 ± 0,93%. Persentase melaninasi pada spermatofor induk udang vaname jantan terendah diperoleh pada perlakuan DK7,5 dan DK10,0 yaitu sebesar 27% dan 20%. Injeksi ekstrak daun karamunting yang dilakukan lima hari sekali berpengaruh terhadap kualitas sperma induk udang vaname jantan. Hasil terbaik diperoleh pada dosis 7,5 mg/kg bobot tubuh setelah empat kali injeksi., Male vaname shrimp broodstock with optimal sperm quality is needed to support the productivity of superior seed supply. One of the plants that has potential to improve sperm quality in shrimp is karamunting (Melastoma malabathricum L.). This study aims to examine the effect of karamunting leaf extract injection on sperm quality of male vaname shrimp broodstock. Male vaname shrimp broodstock were treated by injecting distilled water as a control, as well as injections of karamunting leaf extract at following doses: 7,5 mg/kg body weight (DK7,5), 10 mg/kg body weight (DK10,0), and 12,5 mg/kg body weight (DK12,5). The extract was injected every five days for 20 days. Treatments injected with karamunting leaf extract increased the number of relative sperm counts compared to control. The lowest sperm cell abnormality was observed in DK7,5 treatment on day 20 at 2,04 ± 0,93%. The lowest percentage of melanized spermatophore was obtained in DK7,5 and DK10,0 treatments, at 27% and 20%, respectively. The injection of karamunting leaf extract which is done every five days affects the sperm quality of male vaname shrimp. The best results were obtained at a dose of 7,5 mg/kg body weight after four injections.
Keyword: udang vaname, karamunting, kualitas sperma

Judul: Elektrodeposisi Film Tipis Semikonduktor Cu2ZnSnS4 (CZTS) pada Substrat Kaca ITO
Abstrak: Semiconductor Cu2ZnSnS4 (CZTS) thin film that can be used as absorber layers on solar cell module was made via electrodeposition method. CZTS thin film was electrodeposited on the surface of a silicate glass coated with a thin layer of indium tin oxide (ITO). Deposition process was done using potentiostatic mode at room temperature with a potential of 1.05 V for 30, 45, and 60 minutes, followed with annealing the film at 2 different temperatures, 500 ºC using furnace and 180 ºC using hot plate, both treatments for 45 minutes in N2/H2S atmosphere. The X-ray difractograms were analyzed using Match 2 program and showed that the CZTS thin films had kesterit crystalline structure, with a low percentage of CZTS phase. The thin film also contained secondary phases such as Cu2S, ZnS, and SnS. The obtained CZTS thin films had a thickness between 1.039 and 1.676 μm. Absorption study showed that the band gap energy of CZTS thin films which was annealed using furnace ranged from 1.50 to 1.52 eV, whereas that annealed using the hot plate was not observed. The band gap energy value showed that CZTS thin films can be used as sunlight absorber layers on solar cell. The formation of CZTS crystal film on this investigation was effectively performed using furnace annealing process at a temperature of 500 ºC with deposition time of 45 minutes.
Keyword: Thin film, Electrodeposition, Cu2ZnSnS4