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