The capability of time of flight secondary ion mass spectrometry (ToF-SIMS) to determine the oxidation state of Ce ions doped in a phosphor was investigated. Two samples of SiO2:Ce (4 mol%) with known Ce3+/Ce4+ relative concentrations were subjected to ToF-SIMS measurements. The spectra ...
The cells were constantly grown in synthetic medium and enriched by flow cytometry before depletion of nutrients. At each time point, aliquots were taken for measurements and to determine the age of the population by budscar counting (Figure 1a,Supplementary Figures S1 and S2). The budscar distr...
The detector is equipped with a series of instruments that sample from the center of the chamber to measure reactant and product variation during the reactions. A scanning mobility particle sizer (SMPS) system was used to determine the particle size distribution and mass concentration. The SMPS co...
26. A study on conventional methanotrophs in rice paddy soils showed that methanotrophs regained the ability to oxidize atmospheric CH4after exposure to high CH4concentrations27. A high specific affinity (\({a}_{A}^{0}\)) for CH4has been ...
The type of edge sites,≡MnedgeIVor≡MnedgeIII, and their abundances on Mn oxides were found to be the two most important factors that determine As(III) oxidation rate. This is best seen in the simulation of the stirred-flow experiment where the abundance of fast reacting≡MnedgeIVsites de...
The organic phase was then transferred into a low-volume 5-cm cuvette to determine the absorbance at 482 nm. Because of the na- ture of this technique, a true blank—performed by extract- ing the sample with the organic phase before adding the dye—could not be carried out. However, ...
In the current study,we use a diffusion-controlled reactor to simulate such a redox interfaceto determine how As(III) oxidation by the Mn(III/IV) oxide birnessiteis affected by Fe(II) within transport-limited environments. Our resultsshow that Fe(II) oxidation by birnessite in...
50. Based on the increased abundance of proteins involved in anaerobic respiration and biofilm formation, we speculated that thiosulfate is used as an energy source in the biofilm state. To test this speculation, we measured the proton motive forces (PMFs) in the M382 biofilms with or without ...
To determine the specific residue that is oxidized in the 63His-77Lys fragment, we analyzed the TOF/TOF mass spectrum of the peak at m/z 1736. As shown in Fig. 6C, we found that the residues between 67Glu and 77Lys were intact and that one of the amino acid residues between 63...
To determine whether products were consumed during the reaction or lost during workup, reaction solutions were spiked with small known amounts of these species, and the resulting product mixtures were analyzed for their presence. No such loss or consumption was observed. To test for possible ...