Search
Latest topics
Bacterial spores and their arrangements
Microbiology :: MBBS - MICROBIOLOGY SAQs :: General Microbiology :: Bacterial spores & their arrangement
Page 1 of 1
Bacterial spores and their arrangements
Endospores: (spores) are a dormant form of bacterial cell produced by certain bacteria when starved; the actively growing form of the cell is referred to as vegetative. The spore is resistant to adverse conditions like ultraviolet and gamma radiation, desiccation, lysozyme, temperature, starvation, and chemical disinfectants. They are commonly found in soil and water, where they may survive for long periods of time. Endospores can be destroyed by burning or autoclaving at 120°C for 15 mins.
These spores are commonly found in the genera Bacillus and Clostridium (both Gram positive). The position of the endospore differs among bacterial species. The main types within the cell are Terminal endospores,Central endospores,Subterminal endospores and Lateral endospores.
Resistance mechanism is by:
• Formation of new enzymes e.g. heat resistant catalase
• Increase or decrease in other enzymes level
• Dehydration containing calcium dipicolinate (dipicolinic acid) in the core
• Keratin spore coat layer
The staining techniques used are Moeller stain (the endospore shows up as red, while the rest of the cell stains blue) and Schaffer-Fulton stain (the endospore stains green and bacterial bodies red).
Reactivation of the endospore occurs when conditions are more favourable and involves activation, germination, and outgrowth.
Names & Roll No. – 2006MO38. Sophie Gorniewicz
These spores are commonly found in the genera Bacillus and Clostridium (both Gram positive). The position of the endospore differs among bacterial species. The main types within the cell are Terminal endospores,Central endospores,Subterminal endospores and Lateral endospores.
Resistance mechanism is by:
• Formation of new enzymes e.g. heat resistant catalase
• Increase or decrease in other enzymes level
• Dehydration containing calcium dipicolinate (dipicolinic acid) in the core
• Keratin spore coat layer
The staining techniques used are Moeller stain (the endospore shows up as red, while the rest of the cell stains blue) and Schaffer-Fulton stain (the endospore stains green and bacterial bodies red).
Reactivation of the endospore occurs when conditions are more favourable and involves activation, germination, and outgrowth.
Names & Roll No. – 2006MO38. Sophie Gorniewicz
Similar topics
» BACTERIAL PLASMIDS
» Bacterial Virulence Factors
» Bacterial Growth Curve
» LABELLED DIAGRAM OF BACTERIAL CELL STRUCTURE
» Bacterial Virulence Factors
» Bacterial Growth Curve
» LABELLED DIAGRAM OF BACTERIAL CELL STRUCTURE
Microbiology :: MBBS - MICROBIOLOGY SAQs :: General Microbiology :: Bacterial spores & their arrangement
Page 1 of 1
Permissions in this forum:
You cannot reply to topics in this forum
|
|
Wed Oct 22, 2014 6:51 am by Johnsnow
» protozoa inactivation
Wed Jun 29, 2011 4:28 pm by Guest
» Contributions of louis pasteur
Sun Jun 07, 2009 6:52 pm by arsham
» Immuno prophylaxis of tetanus
Sat Jun 06, 2009 11:16 pm by sakia_fazal
» pathogenecity of CLOSTRIDIUM PERFINGES
Sat Jun 06, 2009 11:03 pm by sakia_fazal
» naglers reaction
Sat Jun 06, 2009 10:53 pm by sakia_fazal
» LABORATORY DAIGNOSIS OF SYPHILIS
Sat Jun 06, 2009 9:27 pm by sakia_fazal
» Trichomonas vaginalis
Sat Jun 06, 2009 6:31 pm by sakia_fazal
» instestinal ameobiasis
Sat Jun 06, 2009 4:49 pm by sakia_fazal