Determination of enantiomeric excess of leucine and valine by X-ray powder diffraction

Two amino acids, leucine and valine, were studied by X-ray powder diffraction (XRPD). The linear correlations between intensity of racemate (decrease) or enantiomer (increase) and enantiomeric excesses were observed in each case

Changes of IgM expression levels in the head kidney of Cyprinus carpio following an infection with Sphareospora molnari

Sphaerospora molnar is a myxozoan inducing sphaerosporosis in common carp and causing serious damage to secondary lamellae and epithelia of the gills. The understanding of the host immune response against S. molnari as well as other myxozoans is very limited in part due to the unresolved life cycle. The focus of this thesis was the quantification of membrane bound and secretory IgM expression levels in the head kidney over a period of 9 weeks following an intraperitoneal injection of S. molnari blood stages. Significant increases in the expression levels of both IgMs were observed reaching its maximum at 42 days after infection. Two weeks following the infection the first significant increases of secretory IgM were detected

Structural Insights into Influence of Isomerism on Properties of Open Shell Cobalt Coordination System

The two coordination compounds of cobalt were designed and synthesized. The substrates were carefully selected to allow gentle tuning of the molecular structure of the designed compounds. The crystal, molecular and supramolecular structure of studied compounds has been determined and discussed. The spectroscopic and thermal properties of designed coordination compounds have been studied and their application as precursors for the synthesis of cobalt oxide nanoparticles has been demonstrated. It was proven that not only are parameters of conversion of the precursor to nanoparticles important, but also small changes in molecular structure can considerably affect the size of formed particles. For unambiguous determination of the influence of compounds structure on their UV-Vis radiation absorption, density functional theory and time-dependent density functions theory calculations have been performed. The complexity of the correct ab-initio reflection of the open shell molecular system was outlined and discussed. The results obtained from density functional theory (DFT) calculations have been also employed for discussion of the bonding properties

DLTS study of Be-DOPED p-type AlGaAs/GaAs MBE layers

Deep-level transient spectroscopy method was applied to study deep hole traps in p-type Al$\text{}_{0.5}$Ga$\text{}_{0.5}$As grown on GaAs semi-insulating substrate by MBE. Five hole traps labelled by us as H0 to H4 were found. For the traps H1, H3 and H4 thermal activation energies obtained from Arrhenius plots were equal to: E$\text{}_{H1}$=0.15 eV, E$\text{}_{H3}$=0.4 eV, and E$\text{}_{H4}$=0.46 eV. Hole emission from the trap H2 was electric field dependent with the thermal activation energy extrapolated to zero-field equal to 0.37 eV. Capture cross-sections for the traps H1 and H4 were thermally activated with energetic barriers 0.04 eV (for H1) and 0.18 eV (for H4)