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Chương 6. Trao đổi thông tin ở vi sinh vật trong
quá trình sống
•Giới thiệu chung
•Biofilms
•Quorum Sensing
•Sự quần tụ và giải quần tụ ở vi sinh vật
•Sản xuất sơ cấp và dòng năng lượng
•Các ví dụ về cộng đồng vi sinh vật
Giới thiệu chung
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Biofilms
Bacteria that are attached to a surface
and form a 3-dimensional structure,
held together by an extracellular
polymeric substance
• Quorum sensing and chemical signaling
• Microcolonies with extracellular matrix
• Network of channels
• Cells experience different environmental conditions
• Multi-species
Sự hình thành và phát triển của Biofilm
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Given the heterogeneity of the environment, how is the biofilm community
structured? There is a strong relationship between the cell’s environment
and its physiology and structure.
Biofilms form Variety of environmental
niches form
Nutrient levels
decrease towards the
center
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Sự phức tạp ở Biofilm
• “Structural” complexity: Number of different parts
and their interactions
• “Hierarchical” complexity: Number of levels in a
hierarchy
• “Functional” complexity:
–Number of different functions an organism can perform, or
–Computational capacity of an organism (or device), the maximal mutual
entropy between input signals and output actions.
• “Sequence” complexity
Microenvironment (chemical signals, nutrient conditions)
-> complex regulatory networks
-> change in physiology or metabolism
-> affects environment
Quorum sensing
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