Judul: Analisis Tataniaga Beras di Indonesia (Kasus : Jawa Barat dan Sulawesi Selatan)
Abstrak: Beras merupakan makana pokok bagi sebagian besar penduduk di Indonesia. Sebagi bahan pokok utama maka ketersediaan dan aksebilitas beras harus terpenuhi baik dari segi kuantitas, kualitas, sasaran dan waktunya.
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Judul: Analisis ketersediaan beras di Propinsi Jawa Barat
Abstrak: Sebagai propinsi penghasil beras terbesar di Indonesia, Jawa Barat mempunyai peranan yang sangat penting dalam pencapaian swasembada pangan di Indonesia. Sebelum propinsi Jawa Barat dimekarkan menjadi propinsi Jawa Barat dan Banten, jumlah penduduk Jawa Barat sebesar 42.4 juta jiwa dan produksi padi sebesar 10 juta ton, setelah terjadi pemekaran pada tahun 2001 jumlah penduduk Jawa Barat menjadi 35.3 juta jiwa (82%) dengan produksi padi sebesar 9.2 juta ton (86%) dan jumlah penduduk Banten sebesar 8 juta jiwa (18%) dengan produksi padi sebesar 1.5 juta ton (14%). Kontribusi Jawa Barat terhadap ketersediaan beras nasional akan berbeda pada saat sebelum dan setelah terjadinya pemekaran, oleh karena itu perlu adanya analisa ketersediaan beras lebih lanjut terutama setelah adanya pemekaran wilayah menjadi dua propinsi. cipta milik IPB University Analisis ketersediaan beras di Propinsi Jawa Barat dilakukan untuk mempelajari sejauh mana kemampuan produksi Jawa Barat dapat memenuhi kebutuhan beras di Jawa Barat sendiri maupun kebutuhan beras secara Nasional dari tahun 1990-2008, yaitu pada saat Jawa Barat sebelum dimekarkan (1990-2000) dan Jawa Barat setelah dimekarkan (2000-2003) serta Jawa Barat lima tahun ke depan (2003-2008). ...
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Judul: Bioelectricity Production from Citrobacter freundii GBH253 and Chlorella pyrenoidosa on Microbial Fuel Cell Anode with Different Carbon Sources
Abstrak: Microbial Fuel Cell (MFC) development has significantly increased from various aspects to get higher and more stable electricity. Developing MFC on microorganism aspect is very important because it plays a crucial role in the MFC system. C. freundii GBH253 is one of the potential exoelectrogen bacterium that could be developed for the MFC system. Integrating C. freundii GBH253 and electricity-producing microalgae, such as C. pyrenoidosa, in the anode of MFC could get more stable and higher electricity. In this study, C. freundii GBH253 and C. pyrenoidosa were coupled to produce electricity from different substrates. C. freundii GBH253 and C. pyrenoidosa were tested on three different media types before being tested on MFC. They were also examined for the co-cultivation test to determine the symbiotic relationship between the two microorganisms. The MFC test was conducted using the Randomized Block Design Factorial and the Tukey test to see significant differences from each treatment. The parameters observed in this study were voltage, power density, Chemical Oxygen Demand (COD), Coulombic Efficiency (CE), pH, and volatile fatty acid (VFA). C. freundii GBH253 cannot grow on microalgae medium, while C. pyrenoidosa could grow on bacterial medium and a mixture of bacterium and microalgae media. The bacterium gained benefit from co-culture with microalgae. In the MFC test, electricity was generated in all treatments, which bacterium + microalgae with acetate treatment could generate power density up to 211,97 mW/m2 and the most stable compared to others. Production of electricity in bacterium-microalgae combination dominated by the bacterium; hence, microalgae still help bacterium by producing electricity and raised the COD value. The pH value of all treatments was higher than the initial pH. Acetate and phenol were VFA produced in all treatments, whereas butyric acid and propionic acid were found in some treatments. Pearson correlation showed that some VFA highly correlated with power density.
Keyword: Chlorella pyrenoidosa, Substrate, Microbial Fuel Cell, Electricity Producing Microalgae, Volatile Fatty Acid, Citrobacter freundii