Soka University Repository / 創価大学機関リポジトリ
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A Structural Analysis on Risks and Solutions in the Information Society
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Optimization of intermittent CO2 supply and flocculation recovery for the cultivation of a haptophyte Isochrysis galbana
Get PDF創価大学博士（工学）The demand for high fucoxanthin and fatty acids content in Isochrysis galbana is rising year by year, therefor, the low-cost cultivation and harvesting in large-scale has become an indispensable issue. Microalgal cultivation is influenced by several factors such as solar irradiance, nutrient availability, agitation, and CO2 supply condition. Continuous aeration for CO2 supply occupies a considerable portion of total energy consumption for microalgae cultivation. While the intermittently CO2 supply has a potential to reduce aeration cost, it may cause a carbon starvation and inhibit the grow of microalgae. Microalgal harvesting also a challenge due to its small cell size. There is a method of flocculation that reduces the cost of harvesting algae by simply adding flocculant and adjusting the pH. Therefore, firstly, this study investigated the effects of concentration and frequency of CO2 supply on productivity of marine microalgae I. galbana. Semi-continuous cultivation of I. galbana was conducted under different CO2 concentration and frequency (0.04 -10% CO2 and continuous, 1/9 minutes of supply; Study 1). Secondly, the effects of using different pH values (between pH 8 and 10) and PO4 (Ca2+) concentrations (between 0 and 10 mM) on microalgal sedimentation were investigated by evaluating the sedimentation efficiency of microalgae cells (Study 2). As a result, under air supply conditions, the biomass productivity reached 0.17 g L-1 d-1 with continuous supply(control). The 5% continuous condition showed highest biomass productivity (0.35 g L-1 d-1). The productivity was only 0.11 g L-1 d−1 in continuous CO2 supply with its concentration of 10%, indicating that a higher DIC concentration also would inhibit the growth of microalgae. On the other hand, the condition with CO2 concentration of 5% and 10% showed 0.3 and 0.22 g L-1 d-1 of productivity in intermittent CO2 supply of 1/9min/min, respectively. These productivities were higher than control. In addition, under air supply conditions, a higher fucoxanthin content was achieved 0.61 mg/g-DW with continuous supply, than 5% and 10% (0.18 and 0.11 mg/g-DW), respectively. However, the fucoxanthin content reached 0.56 mg/g-DW under 5% continuous supply with 1/9 min/min agitation frequency. This result suggests that continuous supply of high concentration of CO2 inhibited the accumulation of fucoxanthin, but intermittent supply was beneficial to the accumulation of fucoxanthin. On the other hand, Fast and efficient sedimentation occurred (within 30 min) at a high PO4 concentration (5,10 mM) at pH 10, the sedimentation rate was achieved 40%.doctoral thesi
Ultimate facts of claim for damage based on company’s duty of care - focus on abuse of authority in workplace cases
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Aspects of Digital Religious Practices and Solitarization in Cuba:The Transformation of the Santeria Religion Through Smart Media and the Internet
Get PDF本稿ではインターネットをはじめとする電子メディアを媒介としたコミュニケーション、相互行為が社会をどのように変容させつつあるのかという点について、宗教文化に限定して考察したものである。日本におけるデジタル・メディアと宗教に関する研究では、宗教教団がどのようにインターネットを活用しており、組織の形態や運営がどのように変化しつつあるのか、といった事例研究が中心となってきた。他方、欧米における研究動向では、Digital Religion という領域において様々な研究が、 990 年代以降蓄積されてきた。本論の前半では、同研究領域の概要を先行研究に沿って紹介し、特にそこでの理論的枠組みが宗教観、儀礼、帰属意識、共同体、権威、身体化という６つの領域である点を整理した。後半では、その中の権威について注目しつつ、キューバにおけるヨルバ系宗教であるレグラ・デ・オチャ＝イファ信仰を題材に、そこにおける伝統的指導者と現代的指導者の相違点、およびそこでの師弟関係の変容および孤独化の現状に注目しつつ論を展開した。departmental bulletin pape
