Estimation of Reactive Thiol Concentrations in Dissolved Organic Matter and Bacterial Cell Membranes in Aquatic Systems

2012 ◽  
pp. 120831120231009 ◽  
Author(s):  
Claresta Joe-Wong ◽  
Elizabeth Shoenfelt ◽  
Emily J. Hauser ◽  
Nyssa Crompton ◽  
Satish C. B. Myneni
Keyword(s):  
Organic Matter ◽  
Dissolved Organic Matter ◽  
Bacterial Cell ◽  
Cell Membranes ◽  
Aquatic Systems

Characterisation of dissolved organic matter in Parisian urban aquatic systems: predominance of hydrophilic and proteinaceous structures

2010 ◽  
Vol 106 (1) ◽  
pp. 89-106 ◽  
Author(s):  
B. Pernet-Coudrier ◽  
G. Varrault ◽  
M. Saad ◽  
J. P. Croue ◽  
M.-F. Dignac ◽  
...  
Keyword(s):  
Organic Matter ◽  
Dissolved Organic Matter ◽  
Aquatic Systems

Quantifying fluxes and characterizing compositional changes of dissolved organic matter in aquatic systems in situ using combined acoustic and optical measurements

2009 ◽  
Vol 7 (1) ◽  
pp. 119-131 ◽  
Author(s):  
Bryan D. Downing ◽  
Emmanuel Boss ◽  
Brian A. Bergamaschi ◽  
Jacob A. Fleck ◽  
Megan A. Lionberger ◽  
...  
Keyword(s):  
Organic Matter ◽  
Dissolved Organic Matter ◽  
Aquatic Systems ◽  
Optical Measurements ◽  
Compositional Changes

Stability and dissolution of silver nanoparticles in sediment-laden water: Influence of suspended sediment and associated dissolved organic matter

2021 ◽  
Author(s):  
Jian Zhao ◽  
Yang Li
Keyword(s):  
Silver Nanoparticles ◽  
Organic Matter ◽  
Ionic Strength ◽  
Dissolved Organic Matter ◽  
Suspended Sediment ◽  
Aquatic Systems ◽  
Physicochemical Transformation ◽  
Effect Mechanism ◽  
Suspended Particulate ◽  
Insight Into

<p>The released silver nanoparticles (AgNPs) will inevitably interact with suspended sediment (SS), because of the ubiquity and abundance of SS in aquatic systems. However, the effect mechanism of SS on the transformation of AgNPs remains unknown and unpredictable. This research investigated the effect of SS on the aggregation, settling, and dissolution of polyvinylpyrrolidone-coated (PVP) AgNPs under environmentally diverse salinity conditions. By determining the morphology of AgNP–SS heteroaggregates and using the DLVO analysis, we revealed that the heteroaggregation between AgNPs and SS was dependent on ionic strength. The formation of AgNP-SS heteroaggregates eventually lead to the rapid settling of AgNPs. Besides, the interactions of sediment-associated dissolved organic matter (SS-DOM) with AgNPs interfered the dissolution of AgNPs under different NaCl concentrations.<strong> </strong>The fate (i.e., aggregation, dissolution and settling) of AgNP in sediment-laden water has been found to be strongly dependent on the presence of SS, SS-DOM and ionic strength. This work provides novel insight into the interaction between suspended particulate matter and AgNPs as well as its effect on AgNP physicochemical transformation in aquatic environment.</p>

Risk analysis of dissolved organic matter-mediated ultraviolet B exposure in Canadian inland waters

2004 ◽  
Vol 61 (12) ◽  
pp. 2511-2521 ◽  
Author(s):  
L A Molot ◽  
W Keller ◽  
P R Leavitt ◽  
R D Robarts ◽  
M J Waiser ◽  
...  
Keyword(s):  
Climate Change ◽  
At Risk ◽  
Organic Matter ◽  
Dissolved Organic Matter ◽  
Ultraviolet B ◽  
Aquatic Systems ◽  
Inland Waters ◽  
Direct Exposure ◽  
Risk Of Exposure ◽  
Ozone Levels

With depleted ozone levels and the possibility that climate change might lower dissolved organic matter (DOM) concentrations, the risk of exposure of fresh waters in Canada to ultraviolet B (UV-B) was evaluated. First, the distribution of a UV-B-sensitive zooplankton genus, Daphnia, was examined as a function of DOM concentration and maximum depth (Zmax) in 258 systems. Distribution was not restricted by UV-B, although very clear, shallow systems are underrepresented. Secondly, the depth at which 1% of surface radiance at 320 nm occurs (Z320,1%) was compared with Zmax in over 1000 aquatic systems in 15 ecozones to determine the proportions of optically clear systems (Zmax ≤ Z320,1%) and systems that may become clear (i.e., are "at risk") should DOM decrease by 50%. South of the treeline, <6% of systems were clear, with the exception of two ecozones with 10%–20%. The proportion of systems at risk was 0% in most regions, with 5%–9% in four regions. DOM levels appear adequate to prevent extirpation of sensitive taxa like Daphnia through direct exposure to UV-B in most regions south of the treeline. However, optically clear and at-risk ponds were much more common in the three Artic ecozones, especially the Northern Arctic and Arctic Cordillera.

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