"fi" ligature present in documentation

[ramiromagno]

! Package inputenc Error: Unicode character fi (U+FB01)
(inputenc)                not set up for use with LaTeX.

See the inputenc package documentation for explanation.
Type  H <return>  for immediate help.
  ...

l.51 yeast tRNA carrier. qPCR amplifi
                                       cations were performed in 380
replicat...

[2] [3]

! Package inputenc Error: Unicode character fi (U+FB01)
(inputenc)                not set up for use with LaTeX.

See the inputenc package documentation for explanation.
Type  H <return>  for immediate help.
  ...

l.222 qPCR amplifi
                    cations were performed in 7.5 µl total reaction
volume c...