{HEAD ~ The construction} of the devices, and the resulting application of the sample and reagents to the chromatographic medium through a barrier in an aperture, allows more even application of the samples and reagents to the chromatographic medium, and reduces {TAIL ~ interference} that might otherwise be introduced by particulates or colored samples 
reduces
{ HEAD ~ The construction } of the devices , and the resulting application of the sample and reagents to the chromatographic medium through a barrier in an aperture , allows more even application of the samples and reagents to the chromatographic medium , and reduces { TAIL ~ interference } that might otherwise be introduced by particulates or colored samples
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