Spelling suggestions: "subject:"tonmineralen"" "subject:"tonmineral""
1 |
Experimentelle Untersuchung zur Auflösungskinetik von Kaolinit und Montmorillonit in Anwesenheit von Sulfat, Phosphat, Amino- und Carbonsäuren sowie Harnstoff im offenen und geschlossenen System / Experimental study on the dissolution kinetics of kaolinite und montmorillonite in the presence of sulfate, phosphate, amino and carboxylic acids as well as urea in open and closed systemsHillebrecht, Jens 27 October 2005 (has links)
No description available.
|
2 |
Einfluss des Mikrogefüges auf ausgewählte petrophysikalische Eigenschaften von Tongesteinen und Bentoniten / Influence of the microfabric on selected petrophysical properties of clay-stones and bentonitesKlinkenberg, Martina 26 February 2008 (has links)
No description available.
|
3 |
Importance of substrate quality and clay content on microbial extracellular polymeric substances production and aggregate stability in soilsOlagoke, Folasade K., Bettermann, Antje, Nguyen, Phuong Thi Bich, Redmile-Gordon, Marc, Babin, Doreen, Smalla, Kornelia, Nesme, Joseph, Sørensen, Søren J., Kalbitz, Karsten, Vogel, Cordula 04 June 2024 (has links)
We investigated the effects of substrate (cellulose or starch) and different clay contents on the production of microbial extracellular polymeric substances (EPS) and concomitant development of stable soil aggregates. Soils were incubated with different amounts of montmorillonite (+ 0.1%, + 1%, + 10%) both with and without two substrates of contrasting quality (starch and cellulose). Microbial respiration (CO2), biomass carbon (C), EPS-protein, and EPS-polysaccharide were determined over the experimental period. The diversity and compositional shifts of microbial communities (bacteria/archaea) were analysed by sequencing 16S rRNA gene fragments amplified from soil DNA. Soil aggregate size distribution was determined and geometric mean diameter calculated for aggregate formation. Aggregate stabilities were compared among 1–2-mm size fraction. Starch amendment supported a faster increase than cellulose in both respiration and microbial biomass. Microbial community structure and composition differed depending on the C substrate added. However, clay addition had a more pronounced effect on alpha diversity compared to the addition of starch or cellulose. Substrate addition resulted in an increased EPS concentration only if combined with clay addition. At high clay addition, starch resulted in higher EPS concentrations than cellulose. Where additional substrate was not provided, EPS-protein was only weakly correlated with aggregate formation and stability. The relationship became stronger with addition of substrate. Labile organic C thus clearly plays a role in aggregate formation, but increasing clay content was found to enhance aggregate stability and additionally resulted in the development of distinct microbial communities and increased EPS production.
|
Page generated in 0.07 seconds