Solute fluxes and sulfur cycling in forested catchments in SW Germany as influenced by experimental (NH4)2SO4 treatments

1995 ◽  
Vol 79 (1-4) ◽  
pp. 109-130 ◽  
Author(s):  
K. H. Feger
Keyword(s):  
Sulfur Cycling ◽  
Forested Catchments ◽  
Solute Fluxes

Modelling the Effects of Acid Deposition: Estimation of Long-Term Water Quality Responses in Forested Catchments in Finland

1988 ◽  
Vol 19 (2) ◽  
pp. 99-120 ◽  
Author(s):  
A. Lepistö ◽  
P. G. Whitehead ◽  
C. Neal ◽  
B. J. Cosby
Keyword(s):  
Water Quality ◽  
Surface Water ◽  
Base Cations ◽  
Surface Water Quality ◽  
Mineral Weathering ◽  
Co2 Solubility ◽  
Forested Catchments ◽  
Deposition Rates ◽  
Magic Model

A modelling study has been undertaken to investigate long-term changes in surface water quality in two contrasting forested catchments; Yli-Knuutila, with high concentrations of base cations and sulphate, in southern Finland; and organically rich, acid Liuhapuro in eastern Finland. The MAGIC model is based on the assumption that certain chemical processes (anion retention, cation exchange, primary mineral weathering, aluminium dissolution and CO2 solubility) in catchment soils are likely keys to the responses of surface water quality to acidic deposition. The model was applied for the first time to an organically rich catchment with high quantities of humic substances. The historical reconstruction of water quality at Yli-Knuutila indicates that the catchment surface waters have lost about 90 μeq l−1 of alkalinity in 140 years, which is about 60% of their preacidification alkalinity. The model reproduces the declining pH levels of recent decades as indicated by paleoecological analysis. Stream acidity trends are investigated assuming two scenarios for future deposition. Assuming deposition rates are maintained in the future at 1984 levels, the model indicates that stream pH is likely to continue to decline below presently measured levels. A 50% reduction in deposition rates would likely result in an increase in pH and alkalinity of the stream, although not to estimated preacidification levels. Because of the high load of organic acids to the Liuhapuro stream it has been acid before atmospheric pollution; a decline of 0.2 pH-units was estimated with increasing leaching of base cations from the soil despite the partial pH buffering of the system by organic compounds.

SULFUR CYCLING AND PYRITE FORMATION IN MODERN EUXINIC LAKES

2017 ◽  
Author(s):  
Fotios Fouskas ◽  
◽  
William Gilhooly ◽  
Josef P. Werne ◽  
Molly D. O'Beirne
Keyword(s):  
Sulfur Cycling ◽  
Pyrite Formation

Claudin Tight Junction Proteins: Novel Aspects in Paracellular Transport

2008 ◽  
Vol 28 (6) ◽  
pp. 577-584 ◽  
Author(s):  
Constanze Will ◽  
Michael Fromm ◽  
Dominik Müller
Keyword(s):  
Tight Junction ◽  
Solute Transport ◽  
Molecular Mechanisms ◽  
Family Members ◽  
Transport Processes ◽  
Paracellular Transport ◽  
Solute Flux ◽  
Solute Fluxes ◽  
Essential Components ◽  
Renal Tubular

Claudins are essential components of the intercellular tight junction and major determinants of paracellular solute fluxes across epithelia and endothelia. Many members of this family display a distinct charge or size specificity, whereas others render the epithelium impermeable to transport. Due to intercellular localization, claudin-mediated transport processes are passive and driven by an electrochemical gradient. In epithelial tissues, claudins exhibit a temporal–spatial expression pattern corresponding with regional and local solute transport profiles. Whereas paracellular transport mechanisms in organs such as intestine and kidney have been extensively investigated, little is known about the molecular mechanisms determining solute transport in the peritoneum, and thus the determinants of peritoneal dialysis. Given the ubiquitous expression of claudins in endothelia and epithelia, it is predictable that claudins also contribute to pore formation and determination in the peritoneum, and that they are involved in solute flux. Therefore, we review the basic characteristics of claudin family members and their function as exemplified in renal tubular transport and give an outlook to what extent claudin family members might be of importance for solute reabsorption across the peritoneal membrane.

scholarly journals Pan-Arctic simulation of coupled nutrient-sulfur cycling due to sea ice biology: Preliminary results

2012 ◽  
Vol 117 (G1) ◽  
Author(s):  
S. Elliott ◽  
C. Deal ◽  
G. Humphries ◽  
E. Hunke ◽  
N. Jeffery ◽  
...  
Keyword(s):  
Sea Ice ◽  
Sulfur Cycling ◽  
Preliminary Results

scholarly journals Impact of switching crop type on water and solute fluxes in deep vadose zone

2015 ◽  
Vol 51 (12) ◽  
pp. 9828-9842 ◽  
Author(s):  
T. Turkeltaub ◽  
D. Kurtzman ◽  
E. E. Russak ◽  
O. Dahan
Keyword(s):  
Vadose Zone ◽  
Crop Type ◽  
Solute Fluxes

scholarly journals Stratigraphic controls on fluid and solute fluxes across the sediment-water interface of an estuary

2014 ◽  
Vol 59 (3) ◽  
pp. 997-1010 ◽  
Author(s):  
Audrey H. Sawyer ◽  
Olesya Lazareva ◽  
Kevin D. Kroeger ◽  
Kyle Crespo ◽  
Clara S. Chan ◽  
...  
Keyword(s):  
Water Interface ◽  
Solute Fluxes
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