Lab 24 Control of Microbial Growth: UV Irradiation of Bacteria

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Created Feb 25, 2013
by
docambridge

 

 
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1
What are the 2 types of radiation used to kill microorganisms?
 
Gamma and Ultraviolet
2
What is Gamma radiation also known as?
 
Ionizing radiation, it's greatest impact is when it collides with molecules in the cell,...
3
What is Ultraviolet radiation also known as?
 
Non-Ionizing radiation, kills by damaging DNA
4
Give an example of UV radiation
 
formation of thymine or cytosine dimers (bonds between 2 adjacent pyrimidines in the DNA strand),...
5
What wavelength of UV light is most lethal?
 
200-900 nm
6
Why is UV light as a sterilzing method not a good idea?
 
It has poor penetrating ability, will not go through plastic, glass and many other materials....
7
What kind of lamps are used in UV light?
 
Germicidal lamps
8
What will looking directly into UV raise cause?
 
Eye damage and cataracts, wear goggles
9
What 2 organisms were used in this experiment?
 
Bacillus cerus and Serratia
10
What were index cards used for in this experiment?
 
While half of the plates were exposed to UV light, the other half was covered with an index...


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