Dissolved Organic Matter Sorption and Molecular Fractionation by Naturally Occurring Bacteriogenic Iron (Oxyhydr)oxides

2019 ◽  
Vol 53 (8) ◽  
pp. 4295-4304 ◽  
Author(s):  
Tyler D. Sowers ◽  
Kathryn L. Holden ◽  
Elizabeth K. Coward ◽  
Donald L. Sparks
Keyword(s):  
Organic Matter ◽  
Dissolved Organic Matter ◽  
Naturally Occurring ◽  
Molecular Fractionation

Sorption and molecular fractionation of biochar-derived dissolved organic matter on ferrihydrite

2020 ◽  
Vol 392 ◽  
pp. 122260 ◽  
Author(s):  
Peng Zhang ◽  
Aiju Liu ◽  
Peng Huang ◽  
Lujuan Min ◽  
Hongwen Sun
Keyword(s):  
Organic Matter ◽  
Dissolved Organic Matter ◽  
Molecular Fractionation

Molecular fractionation of dissolved organic matter on ferrihydrite: effects of dissolved cations

2019 ◽  
Vol 16 (2) ◽  
pp. 137 ◽  
Author(s):  
Minqin Liu ◽  
Yang Ding ◽  
Shimeng Peng ◽  
Yang Lu ◽  
Zhi Dang ◽  
...  
Keyword(s):  
Organic Matter ◽  
Dissolved Organic Matter ◽  
Carbon Cycling ◽  
Natural Environment ◽  
Divalent Cations ◽  
Ion Cyclotron Resonance ◽  
Underlying Mechanisms ◽  
Cu Ions ◽  
Molecular Fractionation ◽  
Background Electrolytes

Environmental contextCarbon sequestration and dynamics are influenced by adsorptive fractionation of dissolved organic matter (DOM) on minerals. We found that the molecular fractionation of DOM on ferrihydrite was highly dependent on the presence of Na, Ca and Cu ions in water. These results advance our mechanistic understanding of the dynamic behaviour of DOM, and contribute to predicting carbon cycling and contaminant behaviour in the natural environment. AbstractThe adsorptive fractionation of dissolved organic matter (DOM) at the ferrihydrite and water interface is a key geochemical process controlling DOM compositions and reactivity, thus affecting carbon cycling and contaminant behaviour in the environment. However, the effects of cations on DOM fractionation and the underlying mechanisms are poorly understood. In this study, Fourier-transform ion cyclotron resonance mass spectrometry (FT-ICR-MS) combined with spectroscopic methods were employed to investigate molecular fractionation of DOM on ferrihydrite under different cations in the background electrolytes, including Na, Ca, and Cu ions. The results indicated that DOM fractionation was influenced by the combined effects of cation type, intrinsic molecular property, and extent of DOM adsorption. DOM adsorption on ferrihydrite exhibited the strongest and the weakest fractionation under Na and Ca background electrolytes, respectively. Both Ca and Cu background electrolytes reduced the adsorption of highly unsaturated and phenolic/polyphenolic molecules with high molecular weight and number of O atoms. In addition to the molecular acidity, the complexation of Ca and Cu ions to DOM binding sites and the coagulation effect of divalent cations may affect molecular fractionation. Additionally, DOM fractionation was enhanced with increasing DOM adsorption. Our results contribute to predicting carbon cycling and contaminant behaviour in the natural environment.

Molecular fractionation and sub-nanoscale distribution of dissolved organic matter on allophane

2019 ◽  
Vol 6 (7) ◽  
pp. 2037-2048 ◽  
Author(s):  
Yang Ding ◽  
Yang Lu ◽  
Peng Liao ◽  
Shimeng Peng ◽  
Yuzhen Liang ◽  
...  
Keyword(s):  
Organic Matter ◽  
Spatial Distribution ◽  
Dissolved Organic Matter ◽  
Molecular Fractionation

We elucidated the spatial distribution of DOM on allophane and the mechanisms controlling the adsorptive fractionation of DOM molecules.

scholarly journals Quantitative Transcriptomics Reveals the Growth- and Nutrient-Dependent Response of a Streamlined Marine Methylotroph to Methanol and Naturally Occurring Dissolved Organic Matter

mBio ◽  
2016 ◽  
Vol 7 (6) ◽  
Author(s):  
Scott M. Gifford ◽  
Jamie W. Becker ◽  
Oscar A. Sosa ◽  
Daniel J. Repeta ◽  
Edward F. DeLong
Keyword(s):  
Organic Matter ◽  
Dissolved Organic Matter ◽  
Carbon Metabolism ◽  
Marine Organic Matter ◽  
Naturally Occurring ◽  
Genome Wide ◽  
Carbon Substrates ◽  
Mrna Content ◽  
Nutrient Conditions

ABSTRACT The members of the OM43 clade of Betaproteobacteria are abundant coastal methylotrophs with a range of carbon-utilizing capabilities. However, their underlying transcriptional and metabolic responses to shifting conditions or different carbon substrates remain poorly understood. We examined the transcriptional dynamics of OM43 isolate NB0046 subjected to various inorganic nutrient, vitamin, and carbon substrate regimes over different growth phases to (i) develop a quantitative model of its mRNA content; (ii) identify transcriptional markers of physiological activity, nutritional state, and carbon and energy utilization; and (iii) identify pathways involved in methanol or naturally occurring dissolved organic matter (DOM) metabolism. Quantitative transcriptomics, achieved through addition of internal RNA standards, allowed for analyses on a transcripts-per-cell scale. This streamlined bacterium exhibited substantial shifts in total mRNA content (ranging from 1,800 to 17 transcripts cell −1 in the exponential and deep stationary phases, respectively) and gene-specific transcript abundances (>1,000-fold increases in some cases), depending on the growth phase and nutrient conditions. Carbon metabolism genes exhibited substantial dynamics, including those for ribulose monophosphate, tricarboxylic acid (TCA), and proteorhodopsin, as well as methanol dehydrogenase ( xoxF ), which, while always the most abundant transcript, increased from 5 to 120 transcripts cell −1 when cultures were nutrient and vitamin amended. In the DOM treatment, upregulation of TCA cycle, methylcitrate cycle, vitamin, and organic phosphorus genes suggested a metabolic route for this complex mixture of carbon substrates. The genome-wide inventory of transcript abundances produced here provides insight into a streamlined marine bacterium’s regulation of carbon metabolism and energy flow, providing benchmarks for evaluating the activity of OM43 populations in situ . IMPORTANCE Bacteria exert a substantial influence on marine organic matter flux, yet the carbon components targeted by specific bacterial groups, as well as how those groups’ metabolic activities change under different conditions, are not well understood. Gene expression studies of model organisms can identify these responses under defined conditions, which can then be compared to environmental transcriptomes to elucidate in situ activities. This integration, however, is limited by the data’s relative nature. Here, we report the fully quantitative transcriptome of a marine bacterium, providing a genome-wide survey of cellular transcript abundances and how they change with different states of growth, nutrient conditions, and carbon substrates. The results revealed the dynamic metabolic strategies this methylotroph has for processing both simple one-carbon compounds and the complex multicarbon substrates of naturally derived marine organic matter and provide baseline quantitative data for identifying their in situ activities and impact on the marine carbon cycle.

Effects of reverse osmosis isolation on reactivity of naturally occurring dissolved organic matter in physicochemical processes

2004 ◽  
Vol 38 (4) ◽  
pp. 1026-1036 ◽  
Author(s):  
James E Kilduff ◽  
Supatpong Mattaraj ◽  
Andrew Wigton ◽  
Mehmet Kitis ◽  
Tanju Karanfil
Keyword(s):  
Organic Matter ◽  
Dissolved Organic Matter ◽  
Reverse Osmosis ◽  
Physicochemical Processes ◽  
Naturally Occurring

Molecular Fractionation of Dissolved Organic Matter with Metal Salts

2012 ◽  
Vol 46 (8) ◽  
pp. 4419-4426 ◽  
Author(s):  
Thomas Riedel ◽  
Harald Biester ◽  
Thorsten Dittmar
Keyword(s):  
Organic Matter ◽  
Dissolved Organic Matter ◽  
Metal Salts ◽  
Molecular Fractionation
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