Lec%207%20Chap%204%20%20Cell%20structures%20Locomotion%20Biofilms%20Sept%208%202008%203%20per

Lec%207%20Chap%204%20%20Cell%20structures%20Locomotion%20Biofilms%20Sept%208%202008%203%20per

Info iconThis preview shows pages 1–5. Sign up to view the full content.

View Full Document Right Arrow Icon
1 1 Lec 7 Chapter 4 Cell Structures Locomotion and Biofilms Sept 8 2008 Fig 4.41 Office phone: 231- 9708 LS-1 room 215 2 Gram Positive Cell Wall Gram Negative Cell Wall Domain Bacteria 3 • Fimbriae and Pili • Paracrystalline Surface Layers (S-Layers) pseudopeptidoglycan Structure of pseudopeptidoglycan N acetylglucosamine (NAG) N acetyltalosaminuronic acid (NAT) attachment Pili (pilus singular)
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
2 4 Glycocalyx: Capsules and Slime Layers slime layer TEM: E. coli attached by capsule Indian ink stain Protein capsule of Bacillus anthracis containing Poly D glutamic acid Arrows show slime layer attaching cells to one another and surface Phagocytosis in action 5 Biofilms – The Glue of Life: Microbes Living Together 6 Biofilm Examples Biofilm on a Surgical Implant: Staphlococcus aureus Biofilms on Teeth: Streptococcus mutans Biofilms in pipes
Background image of page 2
3 7 Cellular Inclusions Magnetosomes Sulfur granules Chemolithotroph: oxidize reduced sulfur to make ATP 8 Cyanobacteria Heterocyst Gas Vesicles 9 Industry: Bacillus thuringiensis – BT toxin Endospore Formation
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
4 10 Microbial Locomotion
Background image of page 4
Background image of page 5
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: Gas Vesicles: motility in water columns Flagellum (flagella plural) Gliding Movement Spirochete bacteria have their flagella embedded in the membrane Flagella (singlular = flagellum) Varied arrangement 1. Monotrichous - single flagellum 2. Lophotrichous - small bunches 3. Amphitrichous - both poles of the cell 4. Peritrichous - randomly over cell surface 1 2 4 11 External Flagella Structure Gram + Gram -12 Run Run Proteus species Plate swarming by Proteus mirabilis 5 13 Chemotaxis: directed movement of microorganisms in response to chemicals. Phototaxis : movement of phototrophic organisms toward an increasing intensity of light. 14 Gliding Movement Prokaryotes that move by gliding motility do not employ rotating flagella but instead creep along a solid surface by any of several possible mechanisms. Gliding can occur from slime secretion Or by a ratchet-protein mechanism that moves the outer membrane of the cell....
View Full Document

Page1 / 5

Lec%207%20Chap%204%20%20Cell%20structures%20Locomotion%20Biofilms%20Sept%208%202008%203%20per

This preview shows document pages 1 - 5. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online