Low copper availability limits Helicobacter infection in mice

FEBS Journal ◽  
2020 ◽  
Vol 287 (14) ◽  
pp. 2948-2960
Author(s):  
Roberta Esposito ◽  
Megi Vllahu ◽  
Silvana Morello ◽  
Daniela Baldantoni ◽  
Alessandro Bellino ◽  
...  
Keyword(s):  
Copper Availability

Evaluation of copper availability to plants in copper-contaminated vineyard soils

2001 ◽  
Vol 111 (2) ◽  
pp. 293-302 ◽  
Author(s):  
L.A Brun ◽  
J Maillet ◽  
P Hinsinger ◽  
M Pépin
Keyword(s):  
Vineyard Soils ◽  
Copper Availability ◽  
Copper Contaminated

Oxidised copper wire as a copper supplement for sheep: a study of some variables which may alter copper availability

1984 ◽  
Vol 61 (9) ◽  
pp. 294-295 ◽  
Author(s):  
G. J. JUDSON ◽  
T. H. BROWN ◽  
D. GRAY ◽  
D. W. DEWEY ◽  
P. J. BABIDGE
Keyword(s):  
Copper Wire ◽  
Copper Availability

scholarly journals Copper availability as related to soil copper fractions in oxisols under liming

2003 ◽  
Vol 60 (1) ◽  
pp. 167-173 ◽  
Author(s):  
Clístenes Williams Araújo do Nascimento ◽  
Renildes Lúcio Ferreira Fontes ◽  
Adilson César Fortes Dias Melicio
Keyword(s):  
Organic Matter ◽  
Atomic Absorption Spectrophotometry ◽  
Soil Samples ◽  
Residual Fraction ◽  
Soil Extracts ◽  
Fe Oxide ◽  
Cu Content ◽  
Mn Oxide ◽  
Copper Availability ◽  
Organic Matter Fractions

The knowledge of the chemical forms of copper in soils and the relationships of these forms with soil copper availability are important for predicting the copper behavior in the soil-plant system. The present work studies the influence of liming on the available contents of copper as well as on the forms of copper fractions in six types of Oxisols. Soil samples, with and without liming, received copper at rates of 0.0, 20.0 and 40.0 mg dm-3 and remained incubated for 30 days. Then, available copper was extracted with Mehlich-1, Mehlich-3, DTPA and EDTA solutions, and analyzed by atomic absorption spectrophotometry. Additionally, soil samples were extracted in a sequential procedure to determine Cu in fractions of soil, as follows: exchangeable-Cu fraction, organic matter-Cu fraction, Mn oxide-Cu fraction, amorphous Fe oxide-Cu fraction, crystalline Fe oxide-Cu fraction, residual-Cu fraction, and the total Cu content in the soil. Soil samples to which Cu was added presented higher Cu retention in the organic matter fraction with a small percentage retained in the exchangeable-Cu fraction. Liming resulted in a decrease of Cu in the exchangeable and organic matter fractions and an increase in the Fe and Mn oxide fractions and in the residual fraction. Without liming, the organic matter fraction presented the highest contribution to Cu content found in the soil extracts obtained with all extractors, except EDTA. For treatments with liming, Cu contents in the organic matter fraction were better correlated to Cu contents in extracts obtained with DTPA and Mehlich-3.

Dealing with Multiple Models in System Dynamics

2014 ◽  
Vol 3 (4) ◽  
pp. 17-35 ◽  
Author(s):  
Willem L. Auping ◽  
Erik Pruyt ◽  
Jan H. Kwakkel
Keyword(s):  
System Dynamics ◽  
Simulation Models ◽  
Dynamics Simulation ◽  
Multiple Models ◽  
Top Down ◽  
Bottom Up ◽  
New Approach ◽  
Behavioural Patterns ◽  
Copper Availability

This paper introduces an approach to compare simulation runs from multiple System Dynamics simulation models. Three dynamic hypotheses regarding the uncertain evolutions of long-term copper availability are introduced and used to illustrate the new approach. They correspond to three different perspectives on the copper system (global top-down, global bottom-up, and regional top-down). Although each of these models allows to generate a wealth of behavioural patterns, the focus in this paper is on the differences in trajectories caused by different models for identical values of shared parameters and identical settings of other assumptions, not on differences in behavioural patterns caused by each of the models. Hence, differences in trajectories between the three models are identified, quantified, and classified based on a quantified measure of difference. For these models, small differences between the trajectories are only found in stable runs, while the alternative perspectives are largely responsible for medium to large differences. Hence, it is concluded that multiple dynamic hypotheses may have to be modelled when dealing with uncertain issues.

scholarly journals Aged biochar changed copper availability and distribution among soil fractions and influenced corn seed germination in a copper-contaminated soil

Chemosphere ◽  
2020 ◽  
Vol 240 ◽  
pp. 124828 ◽  
Author(s):  
Maria Isidória Silva Gonzaga ◽  
Maria Iraildes de Almeida Silva Matias ◽  
Kairon Rocha Andrade ◽  
Amanda Nascimento de Jesus ◽  
Grazielle da Costa Cunha ◽  
...  
Keyword(s):  
Seed Germination ◽  
Contaminated Soil ◽  
Corn Seed ◽  
Soil Fractions ◽  
Copper Availability ◽  
Copper Contaminated

Rhizosphere pH Gradient Controls Copper Availability in a Strongly Acidic Soil

2009 ◽  
Vol 43 (15) ◽  
pp. 5686-5691 ◽  
Author(s):  
M. N. Bravin ◽  
P. Tentscher ◽  
J. Rose ◽  
P. Hinsinger
Keyword(s):  
Acidic Soil ◽  
Ph Gradient ◽  
Rhizosphere Ph ◽  
Copper Availability

scholarly journals Historical, Current, and Future Energy Demand from Global Copper Production and Its Impact on Climate Change

Resources ◽  
2020 ◽  
Vol 9 (4) ◽  
pp. 44 ◽  
Author(s):  
Nadine Rötzer ◽  
Mario Schmidt
Keyword(s):  
Energy Demand ◽  
Copper Production ◽  
Cumulative Energy ◽  
Cumulative Energy Demand ◽  
Future Supply ◽  
Geological Factors ◽  
Copper Availability ◽  
Technological Improvements ◽  
The Relationship ◽  
Ore Grade

Copper has always played an important role in human development. Demand for copper is going to rise, which makes its future supply a key issue for society. However, the oft-discussed declining ore grade and, therefore, the assumed enormous increase in energy demand and global warming potential could lead to a supply constraint. To develop suitable strategies to ensure copper availability, it is important to better understand the relationship between energy and ore grade and also its development. Therefore, in this paper we describe the development of the cumulative energy demand of copper production over the last eight decades and give an outlook into the future using a holistic process-based modelling approach. We also discuss how technological progress has thus far been able to offset the decreasing ore grade. However, if geological factors are becoming less favorable, technological improvements such as renewable energies are vital to keep this trend going.

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