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Title Page 1
Contents 3
ABSTRACT 7
1. INTRODUCTION 8
2. MATERIALS AND METHODS 10
2.1. Materials 10
2.2. Experimental 10
2.2.1. Isolation and identification of chitinolytic bacterium 10
2.2.2. Composition of medium 11
2.2.3. Determination of chitinase activity 12
2.2.4. Gel electrophoresis and activity staining of chitinase 12
2.2.5. Effect of metal ions on chitinase activity 13
2.2.6. Partial purification of chitinase 13
3. RESULTS AND DISCUSSION 15
3.1. Identification of chitinolytic bacterium 15
3.2. Cell growth and chitinase activity 18
3.3. Expression pattern of chitinase isozymes with different culture medium 20
3.3.1. LB medium and chitin medium 20
3.3.2. CSC, SPC, and CSP medium 22
3.3.3. Three different culture medium and effect of yeast extract source 24
3.4. Expression pattern of Native-PAGE isozymes on SDS-PAGE 27
3.5. Inhibition of metal ions for crude enzyme 29
3.6. Partial purification of chitinase 31
4. CONCLUSIONS 33
5. REFERENCES 34
국문 초록 38
Figure 1. Strain MP-306 showed halo formation around colonies on 0.5% colloidal chitin... 16
Figure 2. 16S rRNA gene sequence of the isolated MP-306. Paenibacillus chitinolyticus... 17
Figure 3. Phylogenetic tree of 16S rRNA from the isolated MP-306 17
Figure 4. Time course of cell growth (-○-), protein contents (-∙-), and chitinase activity of P.... 19
Figure 5. Changes of chitinase activity of P. chitinolyticus MP-306 on native-PAGE (A) and... 21
Figure 6. Expression patterns of chitinase produced from Paenibacillus chitinolyticus MP-... 23
Figure 7. Expression patterns of chitinase produced from Paenibacillus chitinolyticus MP-... 25
Figure 8. Expression patterns of chitinase produced from Paenibacillus chitinolyticus MP-... 26
Figure 9. Chitinase activity of P. chitinolyticus MP-306 on 2-D native/native-PAGE gel [A... 28
Figure 10. Chitinase activity of P. chitinolyticus MP-306 with different metal ions on native-... 30
Figure 11. Chitinase activity of P. chitinolyticus MP-306 after chitin-affinity chromatography... 31
Figure 12. Chitinase activity staining of P. chitinolyticus MP-306 after chitin-affinity... 32
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