Shapes and Arrangements of bacteria.pptx

The presentation describes the different morphological forms and arrangement of bacteria. It address the topic at the beginner's level

1. Shapes and Arrangement of bacteria Nimi Narayanan Assistant Professor Department of Micrbiology Government Arts and Science College Kozhinjampara, Palakkad

2. Basic shapes of bacteria Basic shapes of bacteria are: Coccus (pl. cocci ) Bacillus (pl. bacilli) Vibrios Spirillum (pl. spirlli ) Spirochaetes

3. Basic shapes of bacteria Basic shapes of bacteria are: Coccus (pl. cocci ) Spherical or ovoid cells 0.5 – 1.0 µm in diameter Eg : Staphylococcus aureus

4. Basic shapes of bacteria Basic shapes of bacteria are: Bacillus Straight and cylindrical rods 1 – 10 µm in length and 0. 3 -1.0 µm in diameter Eg : Escherichia coli, Bacillus subtilis

5. Basic shapes of bacteria Basic shapes of bacteria are: Vibrio Slightly curved rods or comma shaped. Eg : Vibrio cholerae

6. Basic shapes of bacteria Basic shapes of bacteria are: Spirillum Regularly coiled, rigid, wave-like shaped cell 3 -4 µm in length Usually motile with flagella at both ends Eg . Spirillum minus

7. Basic shapes of bacteria Basic shapes of bacteria are: Spirochaetes Flexible, coiled, Corkscrew shaped cells Usually motile Eg : Treponema pallidum

8. Basic shapes of bacteria

9. Arrangement of bacteria Arrangement of cocci : Cocci have different types of arrangements Diplococci Streptococci Tetracocci Sarcinae Staphylococci

10. Arrangement of bacteria Arrangement of cocci : Cocci have different types of arrangements Diplococci - Cells divide in one plane and remain attached predominately in pairs. Eg : Neisseria gonorrhoeae Division along the same plane forms chains; 2 cocci together - Diplococcus

11. Arrangement of bacteria Cocci have different types of arrangements Streptococci - Cells divide in one plain and remain attached to form chains Eg : Streptococcus faecalis 4 - 20 in chains - Streptococcus.

12. Arrangement of bacteria Cocci have different types of arrangements Tetracocci - - Cells divide in two planes and forms groups of four cells. (also called as ‘tetrads’) Eg : Aerococcus Division along 2 different planes - Tetrads

13. Arrangement of bacteria Cocci have different types of arrangements Sarcinae - Cells divide in three planes , in a regular pattern producing a cubodial arrangement of cells. Eg : Sarcina aurantiaca Division along 3 planes regularly - Sarcinae

14. Arrangement of bacteria Cocci have different types of arrangements Staphylococci - Cells divide in three planes, in an irregular pattern producing bunches of cocci , e.g. Staphylococcus aureus Division along 3 planes irregularly – Staphylococci

15. Identify ??? 1. 2.

16. Identify ??? 3. 4.

17. Identify ??? 5. 6.

18. Identify ??? 7. 8.

19. Identify ??? 9.

20. Answers Diplobacilli Spirillum Vibrio Spirochaetes Diplococci Streptococci Sarcinae Tetracocci Staphylococci

21. Arrangement of bacteria Arrangement of bacilli: Bacilli have different types of arrangements Diplobacilli Streptobacilli Trichomes Palisade

22. Arrangement of bacteria Bacilli have different types of arrangements Diplobacilli – Two bacilli together or in pairs e.g. Coxiella burnetii

23. Arrangement of bacteria Bacilli have different types of arrangements Streptobacilli – bacilli arranged in chains e.g. Bacillus subtilis

24. Arrangement of bacteria Bacilli have different types of arrangements Trichomes – rod-shaped bacteria arranged in chains with a larger area of contact between adjacent cells e.g. Beggiatoa spp

25. Arrangement of bacteria Bacilli have different types of arrangements Palisade - bacilli bend at the area of the division leading to the formation of picket fences or chinese letter alphabets e.g. Corynebacterium diphtheriae

26. Arrangement of bacteria Additional arrangements Filamentous - long thin filament-like bacteria that can branch and form networks called  mycelium e.g. Candidatus savagella

27. Shapes of bacteria Additional shapes Pleomorphic Bacteria - These bacteria do not have any characteristic shape unlike all others described above. They can change their shape under different conditions. e.g.   Mycoplasma pneumoniae

28. Shapes of bacteria Additional shapes Coccobacilli - T heir shape intermediates between rod-shaped and spherical.  short rods that can easily be mistaken for spherical bacteria. e.g.   Haemophilus influenzae .

29. Arrangement of bacteria Trichome Streptobacilli

30. Arrangement of bacteria Diplobacilli Palisade

31. Arrangement of bacteria Filamentous Pleomorphic

32. Arrangement of bacteria Pleomorphic Coccobacilli

33. Shapes of bacteria Coccobacilli Bacilli Cocci

34. Shapes of bacteria

35. Thank you