원문정보
Isolation and Characterization of Xylanolytic Bacteria from Horse Manure
초록
영어
Twenty six microorganisms were isolated from soil and horse manure samples from in Iowa, U.S. Microorganisms were cultivated and screened by using plate count agar (PCA) at 35℃ containing 1% (w/v) oat spelt xylan instead of glucose. The xylanase activities of bacterial strains were analyzed by measuring the concentration of reducing sugar by DNS method. All isolated strains were characterized as the rod form and gram positive strains. Among the isolated strains, the HM6 strains gave the highest xylanase activity. This strain was identified as Bacillus pumilus HM6 by 16S rDNA sequence, morphological and biochemical analysis. Optimal culture temperature and initial medium pH for B. pumilus HM6 were 30-35℃ and pH 6-7, respectively. The maximum xylanase activity of 6879 IU/mL was obtained after growth of HM6 with 1% (w/v) oat spelt xylan at 35℃ for 6 days. Studies on enzymatic properties showed that the optimum conditions for the highest xylanase activity were 60℃ and pH 8.0. In addition, xylanase activity was stable over 2 hours at 50℃, whereas activity decreased after 30 min at 70℃.
목차
1. 서론
2. 재료 및 방법
2.1. Xylanase 생산균주의 분리 및 동정
2.2. 배양온도 및 pH에 따른 생장 영향
2.3. Xylanase 활성 측정
2.4. Xylanase 활성에 대한 온도 및 pH의 영향
3. 결과 및 고찰
3.1. 균주의 분리 및 동정
3.2. 배양온도 및 pH에 따른 생장 영향
3.3.배양 시간에 따른 xylanase 활성특성
3.4. Xylanase 활성에 미치는 온도 및 pH의 영향
4. 결론
감사
References