Chapter 6,part B Microbial Growth
Copyright © 2004 Pearson Education, Inc., publishing as Benjamin Cummings B.E Pruitt & Jane J. Stein Chapter 6, part B Microbial Growth
Preserving Bacteria Cultures 。Deep-freezing:-50°to-95°C 。Lyophilization(freeze-drying):Frozen(-54°to-72°C) and dehydrated in a vacuum
• Deep-freezing: -50°to -95°C • Lyophilization (freeze-drying): Frozen (-54° to -72°C) and dehydrated in a vacuum Preserving Bacteria Cultures
Reproduction in Prokaryotes 。Binary fission 。Budding 。 Conidiospores (actinomycetes) Fragmentation of filaments
• Binary fission • Budding • Conidiospores (actinomycetes) • Fragmentation of filaments Reproduction in Prokaryotes
Binary Fission Cell wall Plasma membrane Cell elongates and DNA is replicated DNA(nuclear area) 2 Cell wall and plasma membrane begin to divide DNA Partially Cell wall (nuclear formed area) cross-wall 3 Cross-wall forms completely around divided DNA Cells separate (a)A diagram of the sequence (b)A thin section of a cell of Bacillus of cell division. licheniformis starting to divide. Figure 6.11
Binary Fission Figure 6.11
Generation Logio of Number Number of Cells Number of Cells 0 1 0 5(25)= 32 1.51 10(210)= 1,024 3.01 15(215)= 32,768 4.52 16(216)= 65,536 4.82 17(21)= 131,072 5.12 18(218)= 262,144 5.42 19(219)= 524,288 5.72 20(220)= 1,048,576 6.02 (b) Figure 6.12b
Figure 6.12b