D value Graphs

[Becki182]

Hi all

 

D value graphs have just been covered in my microbiology class, although I do not fully understand how the D value is worked out.

 

Could someone please explain this? The lines drawn connecting X and Y are not usually drawn for us therefore I need this explained also. Do the points on the Y axis always have to be one after the other?

 

I have attached the kind of graph we have been given to then work out the D value from.

 

Thanks

[CharonY]

I am actually not quite sure I understand your question.

 

I do not fully understand how the D value is worked out.

 

So, can you give me a definition of what the D-value is (forget the plot for now, it is more relevant for the Z-value) and how it s measured?