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. 2023 Jan 10;24(2):1346. doi: 10.3390/ijms24021346

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© 2023 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).

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Multiple factor analysis (MFA) of physiological data in microalgae. (A,B) Score plots of the two-first principal components describing the strains and treatments. Representation of (C) groups of quantitative variables, and (D) categories of qualitative variables. Control and UV-B irradiated microalgal strains (F4, LG1, PEC and ETI) at the end of the treatment. F4 and LG1: Chlorella sorokiniana strains; PEC: Pectinodesmus pectinatus strain; ETI: Ettlia pseudoalveolaris strain; Control: non-treated microalgal strains; UV-B: microalgal strains exposed to UV-B; TAC: total antioxidant capacity; Fv.Fm: the potential efficiency of photosystem II (PSII) photochemistry represented by the ratio F_v/F_m; ΦPSII: the photon yield of PSII photochemistry in the light; Chla: chlorophyll a; Chlb: chlorophyll b; Car: carotenoids. In this analysis, values indicated with nd (not detectable) were approximated with “0” values.