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• W2077994015 endingPage "335" @default.
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• W2077994015 abstract "Complex chemistry and biological uptake pathways render iron bioavailability particularly difficult to assess in natural waters. Bioreporters are genetically modified organisms that are useful tools to directly sense the bioavailable fractions of solutes. In this study, three cyanobacterial bioreporters derived from Synechococcus PCC 7942 were examined for the purpose of optimizing the response to bioavailable Fe. Each bioreporter uses a Fe‐regulated promoter ( isiAB , irpA and mapA ), modulated by distinct mechanisms under Fe deficiency, fused to a bacterial luciferase ( luxAB ). In order to provide a better understanding of the way natural conditions may affect the ability of the bioreporter to sense iron bioavailability, the effect of relevant environmental parameters on the response to iron was assessed. Optimal conditions (and limits of applicability) for the use of these bioreporters on the field were determined to be: a 12 h (12–24 h) exposure time, temperature of 15°C (15°C–22°C), photon flux density of 100 μmol photons·m −2 ·s −1 (37–200 lmol photons·m −2 ·s −1 ), initial biomass of 0.6–0.8 lg chlorophyll a (chl a )·L −1 (0.3–1.5 lg chl a ·L −1 ) or approximately 10 5 bioreporter cells·mL −1 , high phosphate (10 lM), and low micronutrients (absent). The measured luminescence was optimal with an exogenous addition of 60 lM aqueous decanal substrate allowing a 5 min reaction time in the dark before analysis. This study provides important considerations relating to the optimization in the use of bioreporters under field conditions that can be used for method development of other algal and cyanobacterial bioreporters in aquatic systems." @default.
• W2077994015 created "2016-06-24" @default.
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• W2077994015 date "2006-04-01" @default.
• W2077994015 modified "2023-10-13" @default.
• W2077994015 title "OPTIMIZATION OF IRON-DEPENDENT CYANOBACTERIAL (SYNECHOCOCCUS, CYANOPHYCEAE) BIOREPORTERS TO MEASURE IRON BIOAVAILABILITY1" @default.
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• W2077994015 doi "https://doi.org/10.1111/j.1529-8817.2006.00203.x" @default.
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