Peat collapse in the southwestern Everglades: Understanding the matrix level response to salinization and its implications for biogenic gas fluxes from peat soils

2020 ◽  
Author(s):  
Matthew J. Sirianni ◽  
Xavier Comas ◽  
Carlos Coronado-Molina ◽  
David Rudnick ◽  
Gregory J. Mount
Keyword(s):  
Peat Soils ◽  
Biogenic Gas ◽  
Gas Fluxes ◽  
The Matrix

Assessing Forest Soil Disturbance through Biogenic Gas Fluxes

1996 ◽  
Vol 60 (1) ◽  
pp. 291-298 ◽  
Author(s):  
C. J. Dulohery ◽  
Lawrence A. Morris ◽  
Richard Lowrance
Keyword(s):  
Forest Soil ◽  
Soil Disturbance ◽  
Biogenic Gas ◽  
Gas Fluxes

Strategies to mitigate diffuse phosphorus pollution during rewetting of fen peat soils

2010 ◽  
Vol 62 (1) ◽  
pp. 123-131 ◽  
Author(s):  
R. Meissner ◽  
H. Rupp ◽  
J. Seeger ◽  
P. Leinweber
Keyword(s):  
Surface Waters ◽  
Aquatic Ecosystems ◽  
Large Scale ◽  
Nutrient Transfer ◽  
Peat Soils ◽  
Phosphorus Pollution ◽  
Scientific Disciplines ◽  
Gas Fluxes ◽  
North Eastern ◽  
Practical Experiences

The cultivation of fen peat soils (Eutric Histosols) for agricultural purposes, started in Europe about 250 years ago, resulting in decreased soil fertility, increased oxidation of peat and corresponding greenhouse gas fluxes to the atmosphere, nutrient transfer to aquatic ecosystems and losses in total area of the former native wetlands. To prevent these negative environmental effects set-aside programs and rewetting measures were promoted in recent years. Literature results and practical experiences showed that large scale rewetting of intensively used agricultural Histosols may result in mobilisation of phosphorus (P), its transport to adjacent surface waters and an accelerated eutrophication. The paper summarises results from an international European Community sponsored research project and demonstrates how results obtained at different scales and from different scientific disciplines were compiled to derive a strategy to carry out rewetting measures. Based on this findings a simple decision support system (DSS) for a hydrologically sensitive area in the Droemling catchment in north-eastern Germany was developed and since 2005 practically used to prevent freshwater resources from non point P pollution.

scholarly journals Details of Gas Flow in Wetland Plant Roots Unearthed

Eos ◽  
2016 ◽  
Vol 97 ◽  
Author(s):  
David Shultz
Keyword(s):  
Gas Flow ◽  
Trace Gases ◽  
Root Systems ◽  
Plant Roots ◽  
Wetland Plant ◽  
Biogenic Gas ◽  
Gas Fluxes

Scientists track the flow of trace gases through wetland root systems to understand the role of plants in biogenic gas fluxes.

Crystalloid Inclusions in Hepatocyte Mitochondria and Their Similarity to Cytoplasmic Crystalloids

1974 ◽  
Vol 32 ◽  
pp. 198-199
Author(s):  
Odell T. Minick ◽  
Hidejiro Yokoo
Keyword(s):  
Liver Disease ◽  
Alcoholic Liver Disease ◽  
Special Interest ◽  
Structural Variations ◽  
Mitochondrial Alterations ◽  
The Matrix ◽  
Crystalloid Inclusions ◽  
Liver Biopsies

Mitochondrial alterations were studied in 25 liver biopsies from patients with alcoholic liver disease. Of special interest were the morphologic resemblance of certain fine structural variations in mitochondria and crystalloid inclusions. Four types of alterations within mitochondria were found that seemed to relate to cytoplasmic crystalloids.Type 1 alteration consisted of localized groups of cristae, usually oriented in the long direction of the organelle (Fig. 1A). In this plane they appeared serrated at the periphery with blind endings in the matrix. Other sections revealed a system of equally-spaced diagonal lines lengthwise in the mitochondrion with cristae protruding from both ends (Fig. 1B). Profiles of this inclusion were not unlike tangential cuts of a crystalloid structure frequently seen in enlarged mitochondria described below.

Coherency loss in γ' precipitates in nickel-base superalloy

1983 ◽  
Vol 41 ◽  
pp. 244-245
Author(s):  
R. A. Ricks ◽  
Angus J. Porter
Keyword(s):  
Lattice Mismatch ◽  
Lattice Parameter ◽  
Nickel Base Superalloy ◽  
Large Size ◽  
The Matrix ◽  
Nimonic 80A ◽  
Interfacial Dislocations ◽  
Nickel Base ◽  
Coherency Loss ◽  
Nimonic 115

During a recent investigation concerning the growth of γ' precipitates in nickel-base superalloys it was observed that the sign of the lattice mismatch between the coherent particles and the matrix (γ) was important in determining the ease with which matrix dislocations could be incorporated into the interface to relieve coherency strains. Thus alloys with a negative misfit (ie. the γ' lattice parameter was smaller than the matrix) could lose coherency easily and γ/γ' interfaces would exhibit regularly spaced networks of dislocations, as shown in figure 1 for the case of Nimonic 115 (misfit = -0.15%). In contrast, γ' particles in alloys with a positive misfit could grow to a large size and not show any such dislocation arrangements in the interface, thus indicating that coherency had not been lost. Figure 2 depicts a large γ' precipitate in Nimonic 80A (misfit = +0.32%) showing few interfacial dislocations.

Influence of Heat Treatments on Microstructures in an Fe-Co-V Alloy

1974 ◽  
Vol 32 ◽  
pp. 512-513
Author(s):  
S. Mahajan ◽  
M. R. Pinnel ◽  
J. E. Bennett
Keyword(s):  
Single Phase ◽  
Alloy Composition ◽  
Supersaturated Solid Solution ◽  
Cell Formation ◽  
Heat Treatments ◽  
Air Cooling ◽  
Iced Brine ◽  
Transmission Electron ◽  
The Matrix ◽  
Bcc Structure

The microstructural changes in an Fe-Co-V alloy (composition by wt.%: 2.97 V, 48.70 Co, 47.34 Fe and balance impurities, such as C, P and Ni) resulting from different heat treatments have been evaluated by optical metallography and transmission electron microscopy. Results indicate that, on air cooling or quenching into iced-brine from the high temperature single phase ϒ (fcc) field, vanadium can be retained in a supersaturated solid solution (α2) which has bcc structure. For the range of cooling rates employed, a portion of the material appears to undergo the γ-α2 transformation massively and the remainder martensitically. Figure 1 shows dislocation topology in a region that may have transformed martensitically. Dislocations are homogeneously distributed throughout the matrix, and there is no evidence for cell formation. The majority of the dislocations project along the projections of <111> vectors onto the (111) plane, implying that they are predominantly of screw character.

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