Megan Y. Andrews
North Carolina State University
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Publication
Featured researches published by Megan Y. Andrews.
Biology Letters | 2014
Joe Quirk; Megan Y. Andrews; Jonathan R. Leake; Steve A. Banwart; David J. Beerling
Field studies indicate an intensification of mineral weathering with advancement from arbuscular mycorrhizal (AM) to later-evolving ectomycorrhizal (EM) fungal partners of gymnosperm and angiosperm trees. We test the hypothesis that this intensification is driven by increasing photosynthate carbon allocation to mycorrhizal mycelial networks using 14CO2-tracer experiments with representative tree–fungus mycorrhizal partnerships. Trees were grown in either a simulated past CO2 atmosphere (1500 ppm)—under which EM fungi evolved—or near-current CO2 (450 ppm). We report a direct linkage between photosynthate-energy fluxes from trees to EM and AM mycorrhizal mycelium and rates of calcium silicate weathering. Calcium dissolution rates halved for both AM and EM trees as CO2 fell from 1500 to 450 ppm, but silicate weathering by AM trees at high CO2 approached rates for EM trees at near-current CO2. Our findings provide mechanistic insights into the involvement of EM-associating forest trees in strengthening biological feedbacks on the geochemical carbon cycle that regulate atmospheric CO2 over millions of years.
Journal of Microbiological Methods | 2016
Megan Y. Andrews; Cara M. Santelli; Owen W. Duckworth
The chrome azurol S (CAS) assay measures the chelating activity of siderophores, but its application (especially to fungi) is limited by toxicity issues. In this note, we describe a modified version of the CAS assay that is suitable for quantifying siderophore exudation for microorganisms, including fungi.
Data in Brief | 2016
Megan Y. Andrews; Cara M. Santelli; Owen W. Duckworth
This article presents visual image data and detailed methodology for the use of a new method for quantifying the exudation of siderophores during fungal growth. The data include images showing time series for calibration, fungal exudation, and negative controls, as well as replication accuracy information. In addition, we provide detailed protocols for making CAS assay layer plates, the digital analysis protocol for determining area of color change, and discuss growth media that do and do not work with the layer plate method. The results of these data, their interpretation, and further discussion can be found in Andrews et al., 2016 [1].
Environmental Science: Processes & Impacts | 2014
Owen W. Duckworth; Martin M. Akafia; Megan Y. Andrews; John R. Bargar
Biometals | 2016
Megan Y. Andrews; Owen W. Duckworth
Journal of Contemporary Water Research & Education | 2017
Nohemi Almaraz; Andrew H. Whitaker; Megan Y. Andrews; Owen W. Duckworth
Environmental Science: Processes & Impacts | 2017
Owen W. Duckworth; Nelson Rivera; Terrence G. Gardner; Megan Y. Andrews; Cara M. Santelli; Matthew L. Polizzotto
Natural Sciences Education | 2013
James M. Harrington; Terrence G. Gardner; Aziz Amoozegar; Megan Y. Andrews; Nelson Rivera; Owen W. Duckworth
Environmental Science: Processes & Impacts | 2017
Owen W. Duckworth; Nelson Rivera; Terrence G. Gardner; Megan Y. Andrews; Cara M. Santelli; Matthew L. Polizzotto
Agricultural & Environmental Letters | 2017
Owen W. Duckworth; Megan Y. Andrews; Marc A. Cubeta; Amy M. Grunden; P. S. Ojiambo