Dynamics of nonphotochemical superoxide production and decay in the Great Barrier Reef lagoon. Rose, A. L., Godrant, A., Furnas, M., & Waite, T. D. Limnology and Oceanography, 55(4):1521--1536, 2010. doi abstract bibtex Superoxide (O(2)(-)) and hydrogen peroxide (H(2)O(2)) concentrations ranging from 87 to 1120 pmol L(-1) and 5 to 107 nmol L(-1), respectively, were measured in samples of surface water from the Great Barrier Reef (GBR) lagoon in the absence of photochemistry. Nonphotochemical, particle-associated net production rates of O(2)(-) ranging from 1 to 16 pmol L(-1) s(-1) were also determined and calculated to be similar in magnitude to the likely abiotic photochemical O(2)(-) production rates in GBR surface waters. Manipulative experiments using 0.22-mu m filtration and addition of biological inhibitors demonstrated that the majority of this particle-associated production was biological and likely driven by photosynthetic organisms. Pseudo-first-order O(2)(-) decay rate constants were very low at O(2)(-) concentrations \textless 1 nmol L(-1) (values in filtered samples ranged from 0.7 to 4.3 3 10(-2) s(-1)) but increased with increasing O(2)(-) concentration toward a value of similar to 0.2 s(-1) at O(2)(-) concentrations \textgreater 10 nmol L(-1). This was thought to occur because reduced forms of metals such as iron and copper, or redox-active organic moieties, preferentially react with O(2) rather than O(2)(-) at low O(2)(-) concentrations, thereby inhibiting catalyzed O(2)(-) disproportionation. This notion was supported by the observation that addition of superoxide dismutase dramatically increased rates of H(2)O(2) production in samples. We suggest that, under these conditions, O(2)(-) can maintain a biologically useful reducing microenvironment around cells without resulting in significant accumulation of potentially harmful H(2)O(2).
@article{rose_dynamics_2010,
title = {Dynamics of nonphotochemical superoxide production and decay in the {Great} {Barrier} {Reef} lagoon},
volume = {55},
issn = {0024-3590},
doi = {10.4319/lo.2010.55.4.1521},
abstract = {Superoxide (O(2)(-)) and hydrogen peroxide (H(2)O(2)) concentrations ranging from 87 to 1120 pmol L(-1) and 5 to 107 nmol L(-1), respectively, were measured in samples of surface water from the Great Barrier Reef (GBR) lagoon in the absence of photochemistry. Nonphotochemical, particle-associated net production rates of O(2)(-) ranging from 1 to 16 pmol L(-1) s(-1) were also determined and calculated to be similar in magnitude to the likely abiotic photochemical O(2)(-) production rates in GBR surface waters. Manipulative experiments using 0.22-mu m filtration and addition of biological inhibitors demonstrated that the majority of this particle-associated production was biological and likely driven by photosynthetic organisms. Pseudo-first-order O(2)(-) decay rate constants were very low at O(2)(-) concentrations {\textless} 1 nmol L(-1) (values in filtered samples ranged from 0.7 to 4.3 3 10(-2) s(-1)) but increased with increasing O(2)(-) concentration toward a value of similar to 0.2 s(-1) at O(2)(-) concentrations {\textgreater} 10 nmol L(-1). This was thought to occur because reduced forms of metals such as iron and copper, or redox-active organic moieties, preferentially react with O(2) rather than O(2)(-) at low O(2)(-) concentrations, thereby inhibiting catalyzed O(2)(-) disproportionation. This notion was supported by the observation that addition of superoxide dismutase dramatically increased rates of H(2)O(2) production in samples. We suggest that, under these conditions, O(2)(-) can maintain a biologically useful reducing microenvironment around cells without resulting in significant accumulation of potentially harmful H(2)O(2).},
language = {English},
number = {4},
journal = {Limnology and Oceanography},
author = {Rose, Andrew L. and Godrant, Aurelie and Furnas, Miles and Waite, T. David},
year = {2010},
keywords = {ACL, E3, WOS},
pages = {1521--1536}
}
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