{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 {TAIL ~ more even application} of the samples and reagents to the chromatographic medium, and reduces interference that might otherwise be introduced by particulates or colored samples 
{ 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 { TAIL ~ more even application } of the samples and reagents to the chromatographic medium , and reduces interference that might otherwise be introduced by particulates or colored samples
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