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Experiments linking nitrogenase gene expression to nitrogen fixation in the North Pacific subtropical gyre
Experiments linking nitrogenase gene expression nitrogen fixation North Pacific subtropical gyre
2014/4/22
We examined diazotroph activity in controlled experiments containing natural populations of nitrogen (N2)- fixing microbes collected offshore from Kane’ohe Bay, Hawai’i, and from Station ALO...
Partial Stabilization of Fe(II) in Reduced Ferruginous Smectite by Li Fixation
Ferric Ferrous Ferruginous Smectite Infrared Spectroscopy Li Fixation Mossbauer Spectroscopy Oxidation Reduction SWa-1
2011/12/7
Abstract: Partial stabilization of Fe(II) in chemically reduced smectite, which normally readily undergoes reoxidation in air, was achieved. The purpose of this study was to determine if Fe(II) can be...
Hydroxy-Interlayers in Expansible Layer Silicates and Their Relation to Potassium Fixation
Hydroxyaluminum Hydroxyaluminosilicate Montmorillonite Potassium Fixation Vermiculite
2011/12/8
Abstract: Hydroxyaluminosilicate (HAS) and hydroxyaluminum (HyA) ionic solutions having final Al concentrations ranging from 3.74 to 4.00 mM; NaOH/Al molar ratios of 1.0, 2.0 and 2.5; and Si/Al molar ...
Apatite Replacement and Rare Earth Mobilization, Fractionation, and Fixation During Weathering
Apatite Florencite Granite Phosphorus Rare earth elements Rhabdophane Scanning electron microscopy Weathering
2012/1/5
During an electron microscope study of the weathering of granite from southern New South Wales, Australia, an assemblage of minerals including florencite and rhabdophane was discovered replacing apati...
Potassium Fixation by Clay Minerals during Hydrothermal Treatment
Diagenesis Fixation Hydrothermal Interstratification Montmorillonite Potassium Rectorite
2012/2/6
The amount of K fixed in K- and Ca-saturated montmorillonite, vermiculite (trioctahedral), rectorite-type and IMII-ordered mica/montmorillonites was measured as a function of time (1–64 days), tempera...
Alkali Cation Selectivity and Fixation by Clay Minerals
Cation exchange Cation fixation Cation selectivity Equivalent anionic radius Free energy of exchange Illite Smectite
2012/2/9
Two variables must be considered when calculating exchange free energies (ΔG0ex) for 2:1 clays: (1) anionic field strength, as expressed by equivalent anionic radius (ra), and (2) interlayer water con...
Hydrothermal Effects on Cesium Sorption and Fixation by Clay Minerals and Shales
Cesium Hydrothermal Illite Ion fixation Ion sorption Shale Vermiculite Waste repository
2012/2/8
The effects of hydrothermal conditions on the sorption and fixation of cesium by various clay minerals and shales were investigated. Hydrothermal heating, which may be expected in a radioactive waste ...
Selective Sorption and Fixation of Cations by Clay Minerals: A Review
Selective Sorption Fixation of Cations Clay Minerals Review
2012/2/15
Investigations concerning selective sorption and fixation of K and similar cations by clay minerals and soil clays and the mechanisms of these reactions are reviewed. In particular, recent observation...
Relation of Potassium Exchange and Fixation to Degree of Weathering and Organic Matter Content in Micaceous Clays of Podzol Soils
Potassium Exchange Degree Weathering Organic Matter Content Micaceous Clays
2012/2/20
The rates of K exchange of untreated and peroxide-treated micaceous clays from five Podzol soils of increasing degrees of weathering were determined using sodium tetraphenyl boron. In addition, the am...
Factors Affecting Potassium Fixation and Cation Exchange Capacities of Soil Vermiculite Clays
Potassium Fixation Cation Exchange Capacities Factors Soil Vermiculite Clays
2012/2/20
Soil vermiculite clays of varying tetrahedral and octahedral composition and cation exchange capacity (CEC) were examined for their ability to fix K+ in both the wet and dry states. Fixation capacity,...
Boron Fixation by Illites
Boron Fixation Illites
2012/2/21
The mechanism of boron uptake by clays, especially illitic clays, and the factors which control such uptake have long been debated issues. In an attempt to answer some of the questions of the controve...