Wein

Ohne Zusammenfassung     

Der Nachweis von Methylalkohol

Ohne Zusammenfassung     

Statistical analysis of the intermediate filament network in cells of mesenchymal lineage by greyvalue-oriented image segmentation

Intermediate filament networks are part of the cytoskeleton and protect cellular integrity during large deformations. In cells from mesenchymal lineage the cytoskeleton is centrally involved in signal transduction, thereby influencing differentiation. We study the ultrastructure of IF networks in three human mesenchymal cell types, namely undifferentiated mesenchymal stem cells, chondrocytes, and osteoblasts. In order to capture the high morphological variability of IF networks we apply techniques from image analysis to extract the network graph from 2D scanning electron microscopy (SEM) images in a fully automatic way, which allows for a high-throughput analysis of SEM data. The extracted network graphs are analyzed by techniques from spatial statistics to detect differences in network morphology between different cell types and infer strategies of network remodeling used by the cells to adapt their mechanical properties during migration and differentiation.     

Compound nucleus fission and quasi-fission in reactions of 238U with 16O and 27Al

The thermodynamics of pion-condensed nuclear matter is investigated in a relativistic field theory in the mean field approximation. The conditions of the thermodynamical equilibrium of the system lead to a set of self-consistent equations for the meson field amplitudes and for the wave vector of the pion condensate. It is proved, that in the thermodynamical equilibrium the pressure tensor of isolated, infinite nuclear matter is isotropic at any values of the temperature and chemical potential.     

On order parameter fluctuations in Rochelle salt detected by Brillouin scattering

In both of the nonpolar phases of ferroelectric-ferroelastic Rochelle salt frequency and linewidth of the quasilongitudinal acoustic phonon propagating along [011] have been investigated in a high resolution Brillouin- scattering experiment. Softening and damping of this mode can be quantitatively explained by a piezoelectric coupling to the fluctuations of the polarization along the ferroelectric axis, P₁.     

SN-2-artige massenspektrometrische Fragmentierungen bei substituierten N-Alkylpiperidinen. 10. Mitteilung über das massenspektrometrische Verhalten von Stickstoffverbindungen [1]

An S_N2-type fragmentation was observed on mass spectrometric analysis of N-(ω-X-alkyl)-2-alkylpiperidines (X = NRCOR′,  CONH₂,  COOR,  NH₂). The molecular ion after loss of the 2 alkyl substituent on the piperidine ring may eject the neutral piperideine on attack of the substituent X on the α-carbon of the N-substituted alkyl-chain. Through this process a cyclic fragment ion is formed. The influence of its ring size and of the substituent X on the stability of this fragment was investigated. The S_N2 reaction is favoured in the case of production of five- and six-membered rings.