med micro 8 30am wednesday 29 march 2006 bacterial growth nutrition and death
Download
Skip this Video
Download Presentation
Med. Micro. 8:30AM, Wednesday 29 March 2006 Bacterial Growth, Nutrition and Death

Loading in 2 Seconds...

play fullscreen
1 / 14

Med. Micro. 8:30AM, Wednesday 29 March 2006 Bacterial Growth, Nutrition and Death - PowerPoint PPT Presentation


  • 149 Views
  • Uploaded on

Med. Micro. 8:30AM, Wednesday 29 March 2006 Bacterial Growth, Nutrition and Death. Simon Silver e-mail: [email protected] Bacterial cell multiplication . Bacterial growth rate, k dB/dt = kB large k = fast growth; small k = slow growth Generation Time: doubling time, t D

loader
I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.
capcha
Download Presentation

PowerPoint Slideshow about ' Med. Micro. 8:30AM, Wednesday 29 March 2006 Bacterial Growth, Nutrition and Death' - shiela


An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript
med micro 8 30am wednesday 29 march 2006 bacterial growth nutrition and death

Med. Micro. 8:30AM, Wednesday 29 March 2006Bacterial Growth, Nutrition and Death

Simon Silver

e-mail: [email protected]

bacterial cell multiplication
Bacterial cell multiplication
  • Bacterial growth rate, k
    • dB/dt = kB
    • large k = fast growth; small k = slow growth
  • Generation Time: doubling time, tD
    • large tD = slow growth; small tD = fast growth
the growth curve
The growth curve
  • Lag phase
  • exponential phase: balanced growth
  • Stationery phase
  • Death
  • Bacterial cell cycle and cell division
microbial death
Microbial death
  • Sterilization: total inactivation of all living organisms
  • Disinfection: killing organisms on a surface
  • Antiseptic: agent that kills or prevents growth, can be used on body surface
  • Bacteriostatic: reversibly inhibits bacterial multiplication
  • Bactericidal; irreversibly inhibits bacterial multiplication
requirements for bacterial growth
Requirements for bacterial growth
  • Definition of growth
  • New “state”: VBNC- viable but not culturable
  • Nutritional requirements: water, carbon, nitrogen, phosphorous, sulfur
bacterial growth
Bacterial growth
  • Physical requirements
  • pH
  • Temperature: Psychrophiles, Mesophiles- pathogens, Thermophiles
  • Salinity
  • Oxygen
  • Nutrients
metabolism generating energy and synthesizing macromolecules
Metabolism: generating energy and synthesizing macromolecules
  • Fermentation
    • Glycolytic pathway
    • Alternative fates of pyruvate
respiration
Respiration
  • aerobic respiration
    • molecular oxygen serves as the electron acceptor
  • Anaerobic respiration
    • Organic electron acceptors
ad