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Bacteriocin Production by Streptococcus sp. J-C1 Isolated from Kimchi
조영배,조영임,백형석,전홍기,Jo, Young-Bae,Cho, Young-Im,Baik, Hyung-Suk,Jun, Hong-Ki 한국생명과학회 1996 생명과학회지 Vol.6 No.4
Streptococcus sp J-C1 producing bacteriocin was isolated from Kimchi. The optimum conditions for bacteriocin production by Streptococcus sp. J-C1 were evaluated. For the maximum yield of bacteriocin production by Streptococcus sp. J-C1, the cell should be harvested at the late stationary phase and the temperature, pH and NaCl concentration should be 25$\circ$C, pH 8 and without the addition of NaCl, respectively. Sucrose should be used as a carbon source and organic nitrogen such as peptone should be used as a nitorgen source for the best yield. The production of bacteriocin is related to the cell growth of Streptococcus sp. J-C1. The bacteriocin from Streptococcus sp. J-C1 was active for gram positive microorganisms such as Lactobacillus sp., Leuconoctoc sp., Lactococcus sp., Streptococcus mutans, Staphylococcus aureus amd Bacillus subtilis and also active for gram negetive bacteria such as Acetobacter aceti. Antibacterial activity of the bacteriocin was completely disappeared by protease treatment.
조영배(Young-Bae Cho),손호익(Ho-Ik Son),김학만(Hak-Man Kim),곽주식(Joosik Kwak),안용호(Yong-Ho An) 대한전기학회 2014 전기학회논문지 Vol.63 No.11
VSC-HVDC system is vulnerable to a DC fault because the fault current can be injected from AC system to DC system during the fault. Therefore, DC circuit breaker is required to isolate faults in VSC-HVDC system. The inverse current injection method of circuit breaker has been considered as DC circuit breaker. However, the topology has drawback that the breaking time is longer than hybrid circuit breaker using semiconductor devices. In order to solve this problem, this paper proposes an improved topology of circuit breaker based on inverse current injection method . In addition, the proposed topology will be compared with the existing topology. And we will verify its effects by using the simulation results.