Nowadays micro-dust is a serious problem in Korea. In particular micro-dust contains heavy metals such as Pb (lead) and Cd (cadmium) which negatively effect on human health. In this study, we intended to isolate lactic acid bacteria which can scavenge the heavy metals. Firstly we isolated two lactic acid bacteria which were resistant to Ag, Cu, and Zn (30-100 mM AgNO3, CuSO4, ZnSO4 in MRS broth). The two lactic acid bacteria CJNU 1877 and JG 15 were identified Lactobacillus paracasei and Enterococcus faecium, respectively. Subsequently the strains were inoculated in MRS broth and agar plate where 100 ppm of Pb(NO3)2 and CdSO4 were added, respectively. They did grow in the conditions and we found aggregations from 24 h cultures, indicating the strains can absorb the heavy metals, which was further proved by scanning electron microscopy (SEM) and Inductively Coupled Plasma-Optical Emission Spectrometer. Therefore the isolated lactic acid bacteria can be used as a probiotics harboring heavy metal scavenging activity.

Abstract
서 론
재료 및 방법
    시약 및 재료
    중금속(Ag, Cu, Zn) 내성 유산균주 선발
    선발 유산균주의 중금속(Pb, Cd) 내성시험
    선발 유산균주의 중금속(Pb, Cd) 흡착능 검증
    Pb 제거능 정량분석
결 과
    중금속(Ag, Cu, Zn) 내성 유산균주 선발
    선발 유산균주의 중금속(Pb, Cd) 내성시험
    선발된 유산균주의 Pb 및 Cd 흡착능 검증
    선발균주의 Pb 제거능 정량분석
고 찰
References

• 김자이(한국교통대학교 생명공학전공) | Ja-I Kim (Department of Biotechnology, Korea National University of Transportation)
• 김선규(한국교통대학교 생명공학전공) | Seon-Gyu Kim (Department of Biotechnology, Korea National University of Transportation)
• 문기성(한국교통대학교 생명공학전공) | Gi-Seong Moon (Department of Biotechnology, Korea National University of Transportation) Corresponding author