Proton microprobe for chemical dating of monazite

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SR-FTIR spectra of cells, fixed after exposure to protons and nonirradiated neighboring cells (bystander cells), were recorded.

Spectral differences were observed in both the directly targeted and bystander cells and included changes in the DNA backbone and nucleic bases, along with changes in the protein secondary structure.

The layers formed on the Ti–6Al–4V alloy also contained, besides the phases mentioned above, Ti2Al N and other minor Ti–Al–N ternary phases.

The layer topography of both nitrided alloys, examined by atomic force microscopy, exhibited pronounced surface development.

Principal component analysis (PCA) was used to investigate the variance in the entire data set.

The percentage of bystander cells relative to the applied number of protons with two different energies was calculated.

Montel et al., 1996], [Williams et al., 1999], [Cocherie et al., 1998], [Pyle et al., 2005], [De Souza et al., 2006], [Kusiak et al ...

Investigations of the microstructure and mechanical properties of nitrided Ti–1Al–1Mn alloy were performed.

The method has been tested successfully on monazites previously analysed by the SHRIMP ion microprobe, conventional mass spectrometry and chemical dating with an electron microprobe.

The high sensitivity of the proton microprobe has potential to be used for chemical dating of other minerals with U, Th and Pb abundances below the detection limit of the electron microprobe (e.g., zircon, sphene, rutile).


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