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 Usahatani dan Tataniaga Padi Varietas Unggul (Studi Kasus  Beras Pandan Wangi di Kecamatan Warungkondang Kabupaten  Cianjur)
Abstrak: Sistem ketahanan pangan merupakan persoalan tentang penyediaan bahan pangan pokok dalam dimensi kuantitas, kualitas, ruang dan waktu bagi seluruh masyarakat. Dalam bahasa ekonomi masalah ketahanan pangan menyangkut persoalan ekonomi produksi, distribusi dan konsumsi. Beras merupakan bahan pangan pokok bagi 95 persen penduduk Indonesia. Indonesia berhasil berswasembada beras pada tahun 1984. Dua dasawarsa terakhir ketersediaan beras nasional hanya mampu memenuhi 90 persen kebutuhan nasional. Ketersediaan beras dipengaruhi oleh beberapa faktor. Faktor-faktor yang mempengaruhi ketersediaan beras adalah luas areal panen (usahatani), produksi beras atau gabah, dan jumlah penduduk. Peningkatan produksi padi di Indonesia belum mampu mencukupi permintaan kebutuhan masyarakat dalam negeri yang jumlahya semakin bertambah setiap tahunnya. Agar stok beras nasional tercukupi pemerintah melalui Bulog melakukan impor.
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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