Filtern
Erscheinungsjahr
- 2011 (25) (entfernen)
Dokumenttyp
- Zeitschriftenartikel (21)
- Vortrag (3)
- Beitrag zu einem Tagungsband (1)
Schlagworte
- LIBS (2)
- Acceptance area (1)
- Biosensor development (1)
- Calibration (1)
- Carbamazepin (1)
- Cetirizin (1)
- Chemical analysis (1)
- Dairy cows (1)
- Double-pulse LIBS (1)
- Droplet (1)
- EDS (1)
- ELISA (1)
- Encapsulation (1)
- FWHM (1)
- Feed (1)
- Firework display (1)
- Fixed-points (1)
- Fluorescence (1)
- Focal distance (1)
- Glow discharge (1)
- ITS-90 (1)
- Immunoassay (1)
- Impurities (1)
- Kreuzreaktivität (1)
- Laser induced plasma (1)
- Laser-induced breakdown spectroscopy (1)
- MALDI (1)
- MALDI Massenspektrometrie (1)
- Mass spectrometry imaging (1)
- Microparticles (1)
- Milk (1)
- Molten glass (1)
- Multi-element screening (1)
- Nanoparticles (1)
- Nile red (1)
- Organic peroxides (1)
- Parallelising mode (1)
- Particle size range (1)
- Particulate matter (1)
- Pin sample (1)
- Plasma tomography (1)
- Polycapillary X-ray optics (1)
- Polymer (1)
- Polymerisation (1)
- Polystyrene (1)
- Radon transform (1)
- Recycling (1)
- SEM (1)
- SF-ICP-MS (1)
- Semi-lens (1)
- Swelling (1)
- Terrorism (1)
- Threshold values (1)
- Transmission (1)
- Ultraschallfalle (1)
- Water (1)
- XRF (1)
- pH-Abhängigkeit (1)
Eingeladener Vortrag
- nein (3)
A new laser ablation (LA)-ICP-MS method for single cell and cell nucleus imaging was developed. Therein, iodine was employed as an elemental dye for fibroblast cells and for thin tissue sections. At an incubation time of 60 s, iodine is located mainly within the cell nuclei. This effect was illustrated in fibroblast cells, and iodine signal within the cell nucleus was as high as 5 × 104 cps at 4 µm laser spot size. The surrounding cytoplasm was iodinated as well, but to a lesser extent. The spatial resolution attained was sufficient to detect even smaller cell nuclei within a liver biopsy tissue. Furthermore, iodine was successfully employed for biomolecule labeling and we demonstrated that iodine signal increased with increasing thickness of a palatine tonsil tissue. Thus, the use of iodine as an internal standard to correct for tissue inhomogeneities in LA-ICP-MS was investigated for the simultaneous detection of two tumor markers (Her 2 and CK 7) in breast cancer tissue. Additionally, lanthanide background resulting from glass ablation can be corrected for by Eu standardization.
Deciphering the sulfate attack of cementitious materials by high-resolution micro-x-ray diffraction
(2011)
The durability of cementitious materials depends, among others, on their resistance against chemical attack during the service life of a building. Here, we present an approach to analyze changes in the phase composition due to chemical attack in the form of sulfate ingress within the microstructure. Micro-X-ray (µX-ray) diffraction using synchrotron radiation in Debye–Scherrer (transmission) geometry allowed a spatial resolution of 10 µm. Phase transformations in the wake of damaging processes were observed in a detailed high-resolution imaging study. In comparison, samples containing supplementary cementitious materials were investigated and used to reconstruct the influence of different degeneration processes in detail. Additionally, reaction fronts within the bulk were localized by micro-X-ray fluorescence analysis. The experimental setup provided the possibility for analyzing the phase assemblage of a given sample without destroying the microstructure. The specimens for phase analysis are thick sections of the primary material and can be used for further microscopic analysis of the microstructure and microchemistry, e.g., scanning electron microscopy–energy-dispersive X-ray spectroscopy (SEM–EDX) or Raman spectroscopy.
The results of investigations on the emission of particulate matter from three outdoor firework displays are presented. During these events, possibly harmful and toxic aerosol emissions were measured. Aerosols in the size range from 30 to 450 nm were detected. The maxima in the observed particle size distribution were between 80 and 175 nm, and the highest value determined was ~1.3 · 106 particles per cm³, while the highest mass concentration was approximately 1.8 mg m–3. The time-averaged particle mass concentration did, however, not exceed 0.7 mg m–3 (over 15 min).
Molecular masses and end groups of polystyrene (PS) formed in a novel container-less polymerization strategy, based on levitated droplets in an acoustic trap, were determined by Gel Permeation Chromatography (GPC) and Matrix-assisted Laser Desorption/Ionization Time of Flight Mass spectrometry (MALDI-TOF MS).