Judul: Pengujian Aktivitas Antibakteri Ekstrak Tempe Koro Pedang (Canavalia ensiformis L.) terhadap Escherichia coli dan Staphylococcus aureus
Abstrak: Tempeh is a fermented food product usually made from soybean fermented by Rhizopus sp. The objectives of this study were to compare jack bean tempeh characteristics against soybean tempeh and to determine antibacterial activity of jack bean tempeh against Escherichia coli dan Staphylococcus aureus using well diffusion method. The tempeh extraction was conducted by methanol extraction following freezing to separate fatty compound. Characteristic of jack bean tempeh and soybean tempeh were different in moisture content, colour (L and a), and tenderness. The differences in moisture content and tenderness were caused by the difference of soaking time. The colour of jack bean tempeh and soybean tempeh were different because of the beans’s colour. The result showed that jack bean tempeh extracts did not have antibacterial activity against E. coli and S. aureus. Meanwhile, methanol extracts of soybean tempeh from laboratory and market were showed antibacterial activity against S. aureus (7.0 mm and 8.9 mm); but did not have antibacterial activity against E. coli.
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Judul: Kajian Aktivitas Antibakteri Ekstrak Tempe Komak terhadap Bakteri Staphylococcus aureus dan Escherichia coli
Abstrak: Tempe is a modified product fermented by Rhizopus sp. which contains active substances, such as antibacterial substances. The objectives of the study are to compare the yield of hyacinth tempe and bench-scale soybean tempe and to determine the antibacterial activity from hyacinth tempe against bacteria: Staphylococcus aureus and Escherichia coli. The yield is determined by comparing the tempe’s mass and bean’s mass. The antibacterial activities of the extracts are analyzed using well diffusion method. The study shows that the yield of hyacinth tempe (154 %) is higher than the yield of bench-scale soybean (151 %). The study also shows that hyacinth tempe extract has no antibacterial activity against S. aureus 0.0 mm, while commercial-scale and bench-scale soybean tempe extract have antibacterial activity against S. aureus, respectively, 8.9 mm and 7.0 mm. However, all of the tempe extract have no antibacterial activity against E. coli. The raw material of tempe gives contribution to produce antibacterial substance against S. aureus during fermentation by R. oligosporus.
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Judul: Pembuatan Film Tipis Lithium Niobat (LiNbO3) Menggunakan Metode Chemical Solution Deposition (CSD) dengan Variasi Kecepatan Putar (Rpm).
Abstrak: Film tipis merupakan salah satu aspek yang mendapat perhatian sangat besar dalam bidang material, karena film tipis merupakan material menarik yang memiliki sifat optik yang sangat tergantung pada konstanta dielektrik, indeks bias, dan energi gap. Lithium Niobat (LiNbO3 ) dapat digunakan sebagai pelapis pada film tipis karena memiliki sifat piezoelektrik, electrooptical, pyroelectrical dan photorefractive yang sangat baik. Film tipis Lithium Niobat (LiNbO3 ) ditumbuhkan menggunakan metode Chemical Solution Deposition (CSD) dengan variasi kecepatan 3500 rpm, 5000 rpm, 6500 rpm, dan 8000 rpm. Metode ini memiliki keunggulan dapat mengontrol stokiometri film tipis dengan kualitas yang baik, prosedur yang mudah dan membutukan biaya yang relatif murah. Energi band gap yang dihasilkan dari film tipis Lithium Niobat (LiNbO3) berkisar antara rentang 2.1 eV – 2.8 eV dengan indeks bias berada pada rentang 2.18-3.2. Film tipis LiNbO3 memiliki parameter kisi a=b=5.54Ǻ dan c = 16.35 Ǻ. Struktur morfologi film tipis adalah permukaan yang homogen dan ukuran kristal berada pada rentang 0.417 μm – 0.680 μm.
Keyword: film tipis, sifat optik, litium niobat, chemical solution deposition, kecepatan putar