《微生物学 Microbiology》课程PPT教学课件（英文版）domains bacteria archaea 1/5

Chapter 11,part A The Prokaryotes: Domains Bacteria and Archaea

Copyright © 2004 Pearson Education, Inc., publishing as Benjamin Cummings B.E Pruitt & Jane J. Stein Chapter 11, part A The Prokaryotes: Domains Bacteria and Archaea

The Prokaryotes: Domains Bacteria and Archaea One circular chromosome,not in a membrane 。No histones ·No organelles Peptidoglycan cell walls 。Binary fission

The Prokaryotes: Domains Bacteria and Archaea • One circular chromosome, not in a membrane • No histones • No organelles • Peptidoglycan cell walls • Binary fission

Domain Bacteria Cause disease in humans 。Proteobacteria Obligate Live in insects intracellular + parasite ·Mythical Wolbachia Have prosthecae Greek god, Cause Survive in spotted phagocytes Proteus,who Caulobacter Chemoautotrophic fevers + Hyphomicrobium 入 could Brucella Bartonella Plant Nitrobacter Rickettsia Ehrlichia assume pathogen many shapes Agrobacterium Fix nitrogen Gram- × In legume Acetobacter S negative roots Gluconobacter Rhizobium Azospirillum

• Proteobacteria • Mythical Greek god, Proteus, who could assume many shapes • Gram￾negative Domain Bacteria

The o (alpha)Proteobacteria 。Human pathogens: 。Bartonella 。B.hensela Cat-scratch disease 。Brucella Brucellosis

• Human pathogens: • Bartonella • B. hensela Cat-scratch disease • Brucella Brucellosis The  (alpha) Proteobacteria

The a (alpha)Proteobacteria Obligate intracellular parasites: Ehrlichia.Tick-borne,ehrlichiosis Rickettsia.Arthropod-borne,spotted fevers R.prowazekii Epidemic typhus ·R.typhi Endemic murine typhus 。R.rickettsii Rocky Mountain Spotted Fever

• Obligate intracellular parasites: • Ehrlichia. Tick-borne, ehrlichiosis • Rickettsia. Arthropod-borne, spotted fevers • R. prowazekii Epidemic typhus • R. typhi Endemic murine typhus • R. rickettsii Rocky Mountain Spotted Fever The  (alpha) Proteobacteria

The o (alpha)Proteobacteria Slime layer Scattered rickettsias Chicken embryo cell Nucleus Masses of rickettsia in nucleus (a】Rickettsia (b)Rickettsias in chicken embryo cell Figure 11.1

The  (alpha) Proteobacteria Figure 11.1

The a (alpha)Proteobacteria Wolbachia.Live Males Females in insects and other animals No offspring Offspring 8 Offspring Offspring

• Wolbachia. Live in insects and other animals The  (alpha) Proteobacteria

The a (alpha)Proteobacteria 。Have prosthecae: Caulobacter.Stalked bacteria found in lakes ·Hyphomicrobium. Budding bacteria found in lakes Figure 11.2&3

• Have prosthecae: • Caulobacter. Stalked bacteria found in lakes • Hyphomicrobium. Budding bacteria found in lakes The  (alpha) Proteobacteria Figure 11.2 & 3

The a (alpha)Proteobacteria 。Plant pathogen: ·Agrobacterium. Insert a plasmid into plant cells, inducing a tumor Figure 9.17

• Plant pathogen: • Agrobacterium. Insert a plasmid into plant cells, inducing a tumor The  (alpha) Proteobacteria Figure 9.17

The a(alpha)Proteobacteria 。Chemoautotrophic: Oxidize nitrogen for energy 。FiⅸC02 ·Nitrobacter.NH3+→NO2 ·Nitrosomonas.NO2-→NO3

• Chemoautotrophic: • Oxidize nitrogen for energy • Fix CO2 • Nitrobacter. NH3 + → NO2 – • Nitrosomonas. NO2 – → NO3 – The  (alpha) Proteobacteria