Judul: Karakreristik Morfologi dan Kurva Pertumbuhan Bacillus brevis dan Bacillus apiarius.
Abstrak: Bacillus brevis dan Bacillus apiarius merupakan dua spesies Bacillus untuk kandidat probiotik dan sudah banyak diteliti manfaatnya. Pada penelitian ini diamati karakteristik morfologi dan kurva pertumbuhan B. brevis dan B. apiarius. Karakterisfik morfologi diamati secara makroskopis pada agar miring, agar lempengan dan media cair, sedangkan pngamatan mikroskopis dilihat dengan pewarnaan Gram. Kurva pertumbuhan dibuat untuk rnengetahui fase-fase pertumbuhan bakteri yaitu fase lamban (lag), fase eksponensial (logaritmik), fase stasioner dan fase kematian sel. Pada fase eksponensial dapat diketahui waktu generasi bakteri.
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Judul: Bakteri Asam Laktat Asal Bekasam sebagai Kandidat Probiotik
Abstrak: Explotary studies of lactic acid bacteria (LAB) that have the potential as probiotic are continously conducted. One source of LAB which has potential as probiotic candidate is bekasam. The aims of this study were to select and evaluate LAB of bekasam origin as probiotic candidate. Three isolates of LAB of bekasam origin have isolated, selected, and evaluated their probiotic properties by in vitro method, then characterized, and identified with API 50 CHL. The result showed that all isolates well grown in gastric juice pH and small intestines pH with 0.5% bile salt (SR ≥50%). Three isolates showed antimicrobial activity to Enteropathogenic Escherichia coli, Staphylococcus aureus, and Salmonella typhimurium ATCC 14028. Characteristics of three LAB isolates candidate as probiotic were Gram-positive rod shaped, non motile, negative catalase, and homofermentative. The results of the identification found that SK(5) and NS(9) were Lactobacillus plantarum 1 with 99.9% and 99.5% similarities, while BP(10) was Lactobacillus pentosus with 99.9% similarities.
Keyword: probiotic candidate, lactic acid bacteria, in vitro, bekasam

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