• 제목/요약/키워드: Biological Effect

검색결과 5,992건 처리시간 0.036초

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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    • 제26권10호
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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.

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

  • 이홍식;최준혁;신영호;임영섭;한종훈;김화용;이윤우
    • Korean Chemical Engineering Research
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    • 제46권4호
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    • pp.747-751
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    • 2008
  • 수분이나 유리지방산 함량이 높은 폐식용유의 적용 가능성을 알아보기 위하여 초임계메탄올을 이용한 바이오디젤 연료의 합성에서 첨가물이 미치는 영향에 대해 실험하였다. 회분식 반응기를 이용하여 물, 유리지방산, 항산화물질의 함량을 달리하여 전이에스테르화반응을 진행하였고, 기체크로마토그래피를 이용해 시료에 포함된 지방산메틸에스테르의 양을 측정하였다. 수분이 증가함에 따라 생성되는 지방산메틸에스테르의 함량이 약간 감소했으나 염기촉매나 산촉매에 비해서는 그 폭이 아주 작았다. 유리지방산, 비타민 E, ${\beta}$-카로틴의 함량 변화에 따른 영향은 거의 없었다.

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

  • 정진우;안은정;김철환;신수영;이승영;최경민;이창민
    • 한국자원식물학회:학술대회논문집
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    • 한국자원식물학회 2021년도 춘계학술대회
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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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