Assertion: nucleic acid | /r/AtLocation | small concentrations
Facets:
value: often
type: TEMPORAL
value: very
type: DEGREE
Source sentences:
text: Since on the one hand, the nucleic acids are often present in very small concentrations and, on the other hand, they are often found in the presence of many other solid and dissolved substances, e.g., after lysis of cells or in sample material from food, they are difficult to isolate or to measure, in particular in biospecific assays which allow the detection of specific analytes.