This downleveling of the low-intensity signals is done electronically but in the process the noise is downleveled an equal amount, as shown in Figure 14.136.

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The e-nose created by surgeon David Morgan and engineer Ritaban Dutta and colleagues can sit on a doctor's desk and analyse gasses given off by swabs from patients for signs of methicillin-resistant Staphylococcus aureus (MRSA) and other strains of Staph aureus.

One third is a recurring decimal, but one half is a terminate decimal.