Physics of planetary atmospheres. IV - Gas analysis by photoionization mass spectrometry

Photoionization mass spectrometer with 180 deg magnetic analyzer and use as gas analyze

Improvement and optimization of a mass spectrometer employing a photoionization source

Ultraviolet filter and monochromator for mass spectrometer employing photoionization sourc

Development of a mass spectrometer employing a photoionization source

Mass spectrometer using photoionization for ion productio

Analytical photoionization mass spectrometer with an argon gas filter between the light source and monochrometer Patent

Analytical photoionization mass spectrometer with argon gas filter between light source and monochromete

Lunar lander mass spectrometer Final report

Sputter ion source for lunar lander mass spectromete

Plasma beam calibration mass spectrometer

Mass spectrometer for determining ratio of atomic to molecular ions in plasma bea

Mass spectrometer analysis of solid materials with the ion-microprobe sputter source

Sputter ion source mass spectrometer for analysis of solid material

Differential physiological responses of portuguese bread wheat (Triticum aestivum L.) genotypes under aluminium stress

Open Access JournalThe major limitation of cereal production in acidic soils is aluminium (Al) phytotoxicity which inhibits root growth. Recent evidence indicates that different genotypes within the same species have evolved different mechanisms to cope with this stress. With these facts in mind, root responses of two highly Al tolerant Portuguese bread wheat genotypes—Barbela 7/72/92 and Viloso mole—were investigated along with check genotype Anahuac (Al sensitive), using different physiological and histochemical assays. All the assays confirmed that Barbela 7/72/92 is much more tolerant to Al phytotoxicity than Viloso Mole. Our results demonstrate that the greater tolerance to Al phytotoxicity in Barbela 7/72/92 than in Viloso Mole relies on numerous factors, including higher levels of organic acid (OAs) efflux, particularly citrate efflux. This might be associated with the lower accumulation of Al in the root tips, restricting the Al-induced lipid peroxidation and the consequent plasma membrane integrity loss, thus allowing better root regrowth under Al stress conditions. Furthermore, the presence of root hairs in Barbela 7/72/92 might also help to circumvent Al toxicity by facilitating a more efficient uptake of water and nutrients, particularly under Al stress on acid soils. In conclusion, our findings confirmed that Portuguese bread wheat genotype Barbela 7/72/92 represents an alternative source of Al tolerance in bread wheat and could potentially be used to improve the wheat productivity in acidic soils

Towards a fully self-consistent spectral function of the nucleon in nuclear matter

We present a calculation of nuclear matter which goes beyond the usual quasi-particle approximation in that it includes part of the off-shell dependence of the self-energy in the self-consistent solution of the single-particle spectrum. The spectral function is separated in contributions for energies above and below the chemical potential. For holes we approximate the spectral function for energies below the chemical potential by a $\delta$-function at the quasi-particle peak and retain the standard form for energies above the chemical potential. For particles a similar procedure is followed. The approximated spectral function is consistently used at all levels of the calculation. Results for a model calculation are presented, the main conclusion is that although several observables are affected by the inclusion of the continuum contributions the physical consistency of the model does not improve with the improved self-consistency of the solution method. This in contrast to expectations based on the crucial role of self-consistency in the proofs of conservation laws.Comment: 26 pages Revtex with 4 figures, submitted to Phys. Rev.