E. Mechanical receptors are located in the lungs, upper airways, chest wall, and diaphragm which prevent overdistension of the lungs. F. Respiratory defense mechanisms: 1. filtration of air by the upper airways 2. mucociliary clearance system -which is decreased by infection, atropine, alcohol, dehydration,
However, one. of the most challenging aspects of forensic DNA analysis is the. interpretation of low-level testing results where it is difï¬cult to. distinguish reliably between noise and signal from template DNA. that is associated with an evidence sample (3,4).
1 Detection limits and Quantitation limits. â¢ 2  Detection limits refer to a minimum concentration of an analyte that can be. measured above the instrument background noise. Thus, when detection limits. are used as reporting limits, the laboratory is saying that the analyte is not present. at or above the value given.