Journal
ROYAL SOCIETY OPEN SCIENCE
Volume 7, Issue 1, Pages -Publisher
ROYAL SOC
DOI: 10.1098/rsos.191921
Keywords
algae; phase-microscopy; three-dimensional printing; open access
Categories
Funding
- Royal Society [CHG/R1/170017, URF/R/180017]
- Royal Society University Research Fellowship
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Phase microscopy allows stain-free imaging of transparent biological samples. One technique, using the transport of intensity equation (TIE), can be performed without dedicated hardware by simply processing pairs of images taken at known spacings within the sample. The resulting TIE images are quantitative phase maps of unstained biological samples. Therefore, spatially resolved optical path length (OPL) information can also be determined. Using low-cost, open-source hardware, we applied the TIE to living algal cells to measure their effect on OPL. We obtained OPL values that were repeatable within species and differed by distinct amounts depending on the species being measured. We suggest TIE imaging as a method of discrimination between different algal species and, potentially, non-biological materials, based on refractive index/OPL. Potential applications in biogeochemical modelling and climate sciences are suggested.
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