메뉴 건너뛰기
.. 내서재 .. 알림
소속 기관/학교 인증
인증하면 논문, 학술자료 등을  무료로 열람할 수 있어요.
한국대학교, 누리자동차, 시립도서관 등 나의 기관을 확인해보세요
(국내 대학 90% 이상 구독 중)
로그인 회원가입 고객센터 ENG
주제분류

추천
검색

논문 기본 정보

자료유형
학위논문
저자정보

박민정 (충남대학교, 忠南大學校 大學院)

지도교수
윤민호
발행연도
2015
저작권
충남대학교 논문은 저작권에 의해 보호받습니다.

이용수4

표지
AI에게 요청하기
추천
검색

이 논문의 연구 히스토리 (2)

초록· 키워드

오류제보하기
Acid mine drainage occurrence is a serious environmental problem by mining industry, it usually contains high levels of metal ions, such as iron, copper, zinc, aluminum, and manganese, as well as metalloids of which arsenic is generally of the greatest concern. Microorganisms can mediate the formation of minerals by a biomineralization process. Microbially induced calcite precipitation (MICP) has proven to be an effective means to capture heavy metals. Microbial processes that bind metals and form minerals are widespread and represent a fundamental part of key biogeochemical cycles. In the present study, three bacterial strains capable of producing urease were isolated by selective enrichment of heavy metal contaminated soils from a mine-impacted area. All isolated bacteria were identified as Sporosarcina pasteurii with more than 98% of similarity by analysis of 16S rRNA gene sequence. Therefore, the isolated bacteria were named Sporosarcina sp. KM-01 (KP000029), KM-07 (KP000030), and KM-12 (KP000031). The KM-01, KM-07, and KM-12 strains were shown to be able to hydrolyze urea. When the production of ammonium ion by isolated bacteria was investigated by urease activity analysis of indophenol method, the strain KM-01, KM-07 and KM-12 efficiently convert urea to ammonium ion with the yield of 0.70 mM, 0.64 mM, 0.53 mM, respectively. The KM-01, KM-07, and KM-12 strains were shown to be able to precipitate calcium carbonate using urea as a energy source that was amended with calcium chloride. SEM-EDS and XRD analysis showed that calcium carbonate was successfully produced and increased with time. Column leaching experiment was performed to determine whether MICP serves as barrier to resist diffusion from the heavy metal contaminated soil. Metal concentrations in the leachates decreased with respect to time in the treated columns with bacterial isolates. These findings demonstrate that all isolated bacterial strains could potentially be used in the bioremediation of acidic soil contaminated by heavy metals. These results also suggest that three bacterial isolates may be used in the bioremediation of heavy metal contaminated mine soils as a practical example of biomineralization processes.

목차

Ⅰ. 서론 1
Ⅱ. 재료 및 방법 7
제 1절 균주의 분리 및 동정 7
1. Urease 생성균주의 분리 및 선발 7
2. 균주 분리 토양의 특성 분석 9
3. 16S rRNA gene sequence 분석 10
4. Phylogenetic tree 작성 10
제 2절 Urease 분석 11
1. Indophenol법에 의한 Urease 활성 분석 11
2. Colorimetric urea agar법에 의한 Urease 활성 분석 12
3. Urease gene 분석 12
제 3절 실험균주의 특성분석 14
1. 실험균주의 생육곡선 14
2. CaCO3 생성능 확인 14
3. 생성된 CaCO3의 확인 15
제 4절 중금속 용출 저감 효율 확인 16
1. Column 실험을 이용한 중금속 용출저감 효율 확인 16
Ⅲ. 결과 및 고찰 18
제 1절 균주의 분리 및 동정 18
1. Urease 생성균주의 분리 및 선발 18
2. 균주 분리 토양의 특성 분석 19
3. 16S rRNA gene sequence 분석 21
4. Phylogenetic tree 작성 25
제 2절 Urease 분석 27
1. Indophenol법에 의한 Urease 활성 분석 27
2. Colorimetric urea agar법에 의한 Urease 활성 분석 29
3. Urease gene 분석 31
제 3절 실험균주의 특성분석 33
1. 실험균주의 생육곡선 33
2. CaCO3 생성능 확인 35
3. 생성된 CaCO3의 확인 37
제 4절 중금속 용출 저감 효율 확인 44
1. Column 실험을 이용한 중금속 용출저감 효율 확인 44
Ⅳ.결론 48
Ⅴ.참고문헌 50
ABSTRACT 60

최근 본 자료

전체보기

댓글(0)

0