Judul: Pemanfaatan Konsorsia Oleaginous untuk Produksi Biodiesel Menggunakan Substrat Palm Oil Mill Effluent (POME)
Abstrak: Oleaginous accumulate lipid in the bodies and able to use cellulose in POME (Palm Oil Mill Effluent) as sole carbon source for lipid accumulation. Enzyme produce by microorganism is able to hydrolyze cellulose into fermentable sugar. Hydrolytic fungi used in study ATH 2147, S-30, S-50, and oleaginous yeast selected was Y34. The purpose of this study is to determine the hydrolysis activities and the most optimal lipid accumulation biodiesel production and determine the effect of temperature, microbial inoculants, and the incubation time on hydrolysis and lipid accumulation. Hydrolysis and lipid accumulation process at 30oC and 50oC. Based on the analysis, it was found that consortia of ATH 2147+Y34 produce highest cellulose enzyme activity at a temperature of 50oC at day 4 and the highest lipid accumulation at 30oC at pH 4.3 after 6 days cultivation. Fatty acid methyl ester composition was dominated by methyl butanoate, palmitic acid, and stearic acid. These consortia could be used for second-generation biofuel research.
Keyword: Palm Oil Mill Effluent., Oleaginous microbes, Biodiesel

Judul: Pemanfaatan Mikroba Penghidrolisis Selulosa untuk Produksi Gas Metana dengan Bahan Dasar POME (Palm Oil Mill Effluent).
Abstrak: Utilization POME (Palm Oil Mill Effluent) for the production of methane gas has double advantages: increasing effluent quality and energy obtained from methanogenesis. Hydrolyzing microbes play key central role on hydrolyses of complex polysaccharide into fermentable sugar to produce methane gas. The objective of this research was to optimize hydrolyses process to enhance methane production by hidrolizing microbes. The experiment was started with determination of cellulolytic capacity on CMC media, and optimation of celulose activity, focused on the effect of temperature (30C and 50C) and methane gas in the sample analysis using GC-FID. Ability of ATH 2147 was able to hydrolyse cellulose, using CMC and POME substrates, while Y34 was able to ferment POME. Based on methane production consortia of ATH 2147 and Y34 was able to produce highest methane. Amount of methane produced dependent on amount of biomass and temperature. Optimum methanogenesis was at 30C.
Keyword: Palm Oil Mill Effluent, methanogenesis, Hydrolysis

Judul: Closed Knight’s Tour pada Papan Catur Berbentuk Persegi Panjang dengan Ukuran Maksimal 8 × 8
Abstrak: Closed Knight’s Tour merupakan langkah kuda yang mengunjungi setiap kotak pada papan catur tepat satu kali dengan langkah kuda berawal dan berakhir pada kotak yang sama. Graf yang terbentuk dari closed knight’s tour dinotasikan sebagai graf G(m,n), dengan m adalah banyaknya baris dan n adalah banyaknya kolom. Graf tersebut memuat Hamiltonian cycle. Sebuah graf terhubung G adalah graf bipartite jika dan hanya jika graf tersebut tidak memiliki cycle dengan panjang ganjil. Papan catur yang memenuhi syarat cukup untuk memiliki closed knight’s tour adalah papan catur berukuran 5 × 6, 5 × 8, 6 × 6, 6 × 7, 6 × 8, 7 × 8, dan 8 × 8.
Keyword: bipartite, closed knight’s tour, hamiltonian cycle, knight’s tour, teori graf