• Title/Summary/Keyword: biological effect

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Effect of the Shape and Size of Quorum-Quenching Media on Biofouling Control in Membrane Bioreactors for Wastewater TreatmentS

  • Lee, Seonki;Lee, Sang Hyun;Lee, Kibaek;Kwon, Hyeokpil;Nahm, Chang Hyun;Lee, Chung-Hak;Park, Pyung-Kyu;Choo, Kwang-Ho;Lee, Jung-Kee;Oh, Hyun-Suk
    • Journal of Microbiology and Biotechnology
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    • v.26 no.10
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    • pp.1746-1754
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    • 2016

  • Recently, spherical beads entrapping quorum quenching (QQ) bacteria have been reported as effective moving QQ-media for biofouling control in MBRs for wastewater treatment owing to their combined effects of biological (i.e., quorum quenching) and physical washing. Taking into account both the mass transfer of signal molecules through the QQ-medium and collision efficiencies of the QQ-medium against the filtration membranes in a bioreactor, a cylindrical medium (QQ-cylinder) was developed as a new shape of moving QQ-medium. The QQ-cylinders were compared with previous QQ-beads in terms of the QQ activity and the physical washing effect under identical loading volumes of each medium in batch tests. It was found that the QQ activity of a QQ-medium was highly dependent on its specific surface area, regardless of the shape of the medium. In contrast, the physical washing effect of a QQ-medium was greatly affected by its geometric structure. The enhanced anti-biofouling property of the QQ-cylinders relative to QQ-beads was confirmed in a continuous laboratory-scale MBR with a flat-sheet membrane module.

  • https://doi.org/10.4014/jmb.1605.05021 인용 PDF KSCI KPUBS HTML

Effect of Additives on the Contents of Fatty Acid Methyl Esters of Biodiesel Fuel in the Transesterification of Palm oil with Supercritical Methanol (팜유로부터 바이오디젤 연료를 합성하는 초임계유체반응에서 지방산메틸에스테르의 함량에 미치는 첨가물의 영향)

  • Lee, Hong-shik;Choi, Joon-hyuk;Shin, Young Ho;Lim, Youngsub;Han, Chonghun;Kim, Hwayong;Lee, Youn-Woo
    • Korean Chemical Engineering Research
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    • v.46 no.4
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    • pp.747-751
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    • 2008

  • The effect of additives in the synthesis of biodiesel fuel using supercritical methanol was studied in order to examine the possibility of application of spent vegetable oil as a raw material, which has high contents of water or free fatty acid. The experiments were performed by varying the contents of water, free fatty acid or antioxidants respectively in a batch reactor. The contents of fatty acid methyl ester was analyzed by a gas chromatography. As the water contents increased, the contents of fatty acid methyl ester decreased, however, the decrease was very little compared with the alkaline and acid catalyst. The effect of the contents of free fatty acid, vitamin E, and ${\beta}$-carotene was negligible.

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Stachys sieboldii M iq. Protects SH-SY5Y Cells Against Oxygen-Glucose Deprivation/Reoxygenation-Induced Injury by Inhibition of Mitochondrion-Mediated Apoptosis Pathway (허혈-재관류 유도 SH-SY5Y 모델에서 미토콘드리아 매개 Apoptosis 기전 제어를 통한 초석잠 추출물의 세포보호 효과)

  • Jin-Woo Jeong;Eun Jung Ahn;Chul Hwan Kim;Su Young Shin;Seung Young Lee;Kyung-Min Choi;Chang-Min Lee
    • Proceedings of the Plant Resources Society of Korea Conference
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    • 2021.04a
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    • pp.57-57
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    • 2021

  • Oxygen glucose deprivation/re-oxygenation (OGD/R) induces neuronal injury via mechanisms that are believed to mimic the pathways associated with brain ischemia. Stachys sieboldii Miq. (Chinese artichoke), which has been extensively used in oriental traditional medicine to treat of ischemic stroke; however, the role of S. sieboldii Miq. (SSM) in OGD/R induced neuronal injury is not yet fully understood. The present research is aimed to investigate the protective effect and possible mechanisms of SSM extract treatment in an in vitro model of OGD/R to simulate ischemia/reperfusion Injury. Pretreatment of these cells with SSM significantly attenuated OGD/R-induced production of reactive oxygen species (ROS) by increasing GPx, SOD, and decreasing MDA. SSM decreased mitochondrial damage caused by OGD/R injury and inhibited the release of cyt-c from mitochondrion to cytoplasm in SH-SY5Y cells. Furthermore, neuronal cell apoptosis caused by OGD/R injury was inhibited by SSM, and SSM could decrease apoptosis by increasing ratio of Bcl-2/Bax and inhibiting caspase signaling pathway in SH-SY5Y cells. SSM demonstrated a neuroprotective effect on the simulated cerebral ischemia in vitro model, and this effect was the inhibition of mitochondria-mediated apoptosis pathway by scavenging of ROS generation. Therefore, SSM may be a promising neuroprotective strategy against ischemic stroke.

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