UV-C suppression on hazardous metabolites in Microcystis aeruginosa: Unsynchronized production of microcystins and odorous compounds at population and single-cell level

Document Type

Article

Publication Date

10-5-2018

Abstract

The effectiveness of UV-C towards the toxin and odor of M. aeruginosa at population and single cell levels were investigated in three ways. In the absence of UV-C, MC-LR and β-cyclocitral production show similar pattern of incremental rate with growth rate on population level shown as intracellular concentrations of MC-LR (CMC) and β-cyclocitral (CBCC), but the cellular quota of MC-LR (QMC) and β-cyclocitral (QBCC) at single-cell level reached the maximum values, 37.5 ± 1.2 fg cell−1 and 4.3 ± 0.1 fg cell−1, just after the early exponential phase. Second, upon UV-C irradiation, the CMC consistently decreased by 10–41% with increase of UV-C dosage (50–200 mJ cm-2) while CBCC increased by 2–14%. Third, during the 14 days’ post-UV incubation, UV-C at 75–200 mJ cm-2 induced remarkable suppressing effects on both CMC and CBCC for 3–14 days. The suppressing effects on QMC and QBCC were induced by UV-C at 100 mJ cm-2 and above, with shorter suppressing periods by 1–4 days and lower decremental rates by 21%–30% than that of CMC and CBCC, indicating interruptions on biosynthesis processes partially contribute to suppression effects of CMC and CBCC. The suppression effect on either CBCC or QBCC, with higher decrement rates while lower recovery rates, was more severe than CMC and QMC.

Identifier

85050115791 (Scopus)

Publication Title

Journal of Hazardous Materials

External Full Text Location

https://doi.org/10.1016/j.jhazmat.2018.07.052

e-ISSN

18733336

ISSN

03043894

PubMed ID

30041121

First Page

281

Last Page

289

Volume

359

Grant

51108244

Fund Ref

Major Science and Technology Program for Water Pollution Control and Treatment

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