Fig. 3
From: Ambient black carbon particles reach the fetal side of human placenta
Validation experiments to confirm the carbonaceous nature of the identified particles inside the placenta. a XY-images acquired throughout a placental section in the z-direction and corresponding orthogonal XZ-projections and YZ-projections showing a BC particle (white and indicated by white arrowheads) inside the tissue (red and green). Scale bar: 50 µm. b Emission fingerprint of identified black carbon (BC), reference carbon black (REF) particles and two-photon excited autofluorescence (TPAF) under femtosecond pulsed illumination. c Temporal response of BC and REF particles and TPAF measured by time-correlated single photon counting. The instrument response function (IRF) overlaid in blue. Source data are provided as a Source Data file
