four distinct binding modes for the interaction of escherichia coli single-strand binding ( ssb ) protein with single-stranded ( ss ) dna have been identified on the basis of quantitative titrations that monitor the quenching of the ssb protein fluorescence upon binding to the homopolynucleotide poly ( dt ) over a range of mgcl2 and nacl concentrations at 25 and 37 degrees c .
C0392762
quantitative
C1514721
range