Successfully reported this slideshow.
We use your LinkedIn profile and activity data to personalize ads and to show you more relevant ads. You can change your ad preferences anytime.

Bacterial Growth

35,225 views

Published on

Bacteria divide by a process known as binary fission in which a single bacterium splits into two.

  • As a student athlete I’m always on the grind at basketball practice and I’ve been really short on time all through high school. I usually order a research paper or English essay here and there. The website is called ⇒ www.HelpWriting.net ⇐ and they really help me out, man. Don’t know where I’d be without it.
       Reply 
    Are you sure you want to  Yes  No
    Your message goes here
  • Follow the link, new dating source: ❶❶❶ http://bit.ly/2F4cEJi ❶❶❶
       Reply 
    Are you sure you want to  Yes  No
    Your message goes here
  • Dating for everyone is here: ❶❶❶ http://bit.ly/2F4cEJi ❶❶❶
       Reply 
    Are you sure you want to  Yes  No
    Your message goes here
  • Unlock Her Legs is your passage way to a life full of loving and sex... read more ... ♥♥♥ http://t.cn/AijLRbnO
       Reply 
    Are you sure you want to  Yes  No
    Your message goes here
  • DOWNLOAD THIS BOOKS INTO AVAILABLE FORMAT (Unlimited) ......................................................................................................................... ......................................................................................................................... Download Full PDF EBOOK here { https://tinyurl.com/yyxo9sk7 } ......................................................................................................................... Download Full EPUB Ebook here { https://tinyurl.com/yyxo9sk7 } ......................................................................................................................... ACCESS WEBSITE for All Ebooks ......................................................................................................................... Download Full PDF EBOOK here { https://tinyurl.com/yyxo9sk7 } ......................................................................................................................... Download EPUB Ebook here { https://tinyurl.com/yyxo9sk7 } ......................................................................................................................... Download doc Ebook here { https://tinyurl.com/yyxo9sk7 } ......................................................................................................................... ......................................................................................................................... ......................................................................................................................... .............. Browse by Genre Available eBooks ......................................................................................................................... Art, Biography, Business, Chick Lit, Children's, Christian, Classics, Comics, Contemporary, Cookbooks, Crime, Ebooks, Fantasy, Fiction, Graphic Novels, Historical Fiction, History, Horror, Humor And Comedy, Manga, Memoir, Music, Mystery, Non Fiction, Paranormal, Philosophy, Poetry, Psychology, Religion, Romance, Science, Science Fiction, Self Help, Suspense, Spirituality, Sports, Thriller, Travel, Young Adult,
       Reply 
    Are you sure you want to  Yes  No
    Your message goes here

Bacterial Growth

  1. 1. Dr Maria Omair Registrar Microbiology Army Medical College
  2. 2. Training objectives <ul><li>Introduction to the topic </li></ul><ul><li>Understand exam scenarios </li></ul><ul><li>Prepare for viva voce </li></ul>
  3. 3. Bacterial Growth <ul><li>Bacteria divide by a Process called Binary Fission </li></ul>
  4. 4. Binary Fission <ul><li>Binary Fission is a type of Asexual reproduction in single celled organisms </li></ul><ul><li>Each cell divides into 2 equal sized offspring </li></ul>
  5. 5. Bacterial Doubling Time <ul><li>Escherichia coli 20 minutes </li></ul><ul><li>Mycobacterium tuberculosis 1 8 hours </li></ul><ul><li>Mycobacterium leprae 14 days </li></ul>
  6. 6. Logarithmic or Exponential Growth <ul><li>The population of bacterial cells divide at a constant rate so that the total number of cells doubles with each division </li></ul>
  7. 7. Bacteria Undergo Exponential Growth
  8. 8. Stages of Bacterial Growth <ul><li>Lag </li></ul><ul><li>Log (logarithmic) </li></ul><ul><li>Stationary </li></ul><ul><li>Death </li></ul>
  9. 9. Stages of Bacterial Growth <ul><li>Lag Adapt to nutrients </li></ul><ul><li>Log Active Growth </li></ul><ul><li>Stationary Growth equals death </li></ul><ul><li>Death Nutrients Consumed </li></ul>
  10. 10. Stages of Bacterial growth
  11. 12. Factors affecting Bacterial Growth <ul><li>Amount of nutrients </li></ul><ul><li>Temperature </li></ul><ul><li>pH </li></ul><ul><li>Other Environmental factors </li></ul>
  12. 13. Classification based upon Nutrient requirements <ul><li>Auxotrophs </li></ul><ul><ul><li>Can live on simple compounds </li></ul></ul><ul><ul><ul><li>NO 3 -, Glucose </li></ul></ul></ul><ul><ul><ul><li>Make all Amino Acids, Vitamins, etc. </li></ul></ul></ul><ul><li>Prototrophs </li></ul><ul><ul><li>Require complex compounds </li></ul></ul><ul><ul><ul><li>Vitamins, Amino Acids </li></ul></ul></ul><ul><ul><ul><li>Fastidious </li></ul></ul></ul><ul><ul><ul><li>Most Pathogens </li></ul></ul></ul>
  13. 14. Classification based upon temperature requirements <ul><li>Mesophiles </li></ul><ul><ul><li>Organisms which are able to grow at 20-40 0 C </li></ul></ul><ul><ul><li>Most of the human pathogens </li></ul></ul><ul><li>Psychrophiles </li></ul><ul><ul><li>Organisms which grow best at <10 0 C </li></ul></ul><ul><ul><li>Capable of growth in pharmaceuticals and foods stored in refrigerator </li></ul></ul><ul><li>Thermophiles </li></ul><ul><ul><li>Organisms which grow best at >6O 0 C </li></ul></ul>
  14. 15. Effect of Temp on Growth
  15. 16. Classification based upon pH requirements <ul><li>Acidophiles(pH <5.0) </li></ul><ul><ul><li>Organisms that grow at a low pH e.g. Lactobacillus spp., Thiobacillus ferroxidans </li></ul></ul><ul><li>Neutrophiles (pH 6.0-8.0) </li></ul><ul><ul><li>Organisms that grow at a neutral pH </li></ul></ul><ul><ul><li>Most of human pathogens </li></ul></ul><ul><li>Alkaliphiles (pH 8.5-10.5) </li></ul><ul><ul><li>Organisms that grow at a high salt conc. or at high pH e.g. Vibrio spp., Bacillus alcalophilus </li></ul></ul>
  16. 17. Effect of pH on Bacterial Growth
  17. 18. Classification based upon Oxygen requirements <ul><li>Strict Aerobes </li></ul><ul><ul><li>Grow only in the presence of ambient oxygen (21%) </li></ul></ul><ul><ul><li>e.g. Mycobacterium tuberculosis, Pseudomonas aeruginosa </li></ul></ul><ul><li>Strict Anaerobes </li></ul><ul><ul><li>Grow only in the absence of oxygen </li></ul></ul><ul><ul><li>Bacteroides fragilis </li></ul></ul>
  18. 19. Classification based upon Oxygen requirements (Contd.) <ul><li>Facultative Anaerobes </li></ul><ul><ul><li>Can grow in anaerobic environment but grow best in aerobic environment </li></ul></ul><ul><ul><li>e.g. Staphylococcus aureus, Escherichia coli </li></ul></ul><ul><li>Aerotolerant anaerobes </li></ul><ul><ul><li>Are anaerobes but can tolerate exposure to oxygen </li></ul></ul><ul><ul><li>e.g. Clostridium perfringens </li></ul></ul>
  19. 20. Classification based upon Oxygen requirements (Contd.) <ul><li>Microaerophilic </li></ul><ul><ul><li>Require or prefer decreased oxygen environment (5%) </li></ul></ul><ul><ul><li>e.g. Campylobacter jejuni , Helicobacter pylori </li></ul></ul><ul><li>Capnophilic </li></ul><ul><ul><li>Require or prefer increased CO2 environment </li></ul></ul><ul><ul><li>e.g. Neisseria meningitidis </li></ul></ul>
  20. 21. Effect of Oxygen Concentration on Bacterial Growth
  21. 24. Questions?

×