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News in Action 4 (1999)(Daily Telegraph)[Mac-PC].iso
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00622_Text_Text Window Template.txt
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1999-02-05
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Brain scanner to foil meat cheats
1 Use a textbook to find out how NMR spectroscopy works.
a) What type of scanning radiation is used?
b) Why must the sample be placed in a magnetic field?
c) What types of atoms are detected by this method?
2 What was this method first used for in hospital?
3 Why do you think such a sophisicated analytical method is needed to find out something as simple as the water content of meat?
4 What do you think are the disadvantages in having an extra-high water content in meat on sale in the shops?
5 Why does food which has been frozen and then thawed often have a different texture from fresh food?