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Organisationseinheit der BAM
- 6 Materialchemie (825) (entfernen)
Photoelectron spectroscopy
(2018)
Quantifizierung der Schädigung von DNA in wässriger Lösung unter direkter Elektronenbestrahlung
(2018)
To cure cancer radiation therapy is used to kill tumor cells.
It is based on radiation induced damage to biomolecules.
Especially DNA damage is of key interest due to its central role in apoptosis and mutation.
Because of the high amount of water in biological tissue, most of the damage is caused by the secondary particles produced by the inelastic scattering of ionizing radiation and water.
A detailed understanding of the underlying molecular processes under physiological conditions is the prerequisite to develop more efficient therapies.
Goal of this work is to quantify the DNA damage caused by ionizing radiation in dependence of the inelastic scattering events and the energy deposit within the microscopic target volume of biological relevance.
The irradiations have to be performed in liquid, under consideration of the chemical environment.
Therefore, a new combination of experiment and Monte-Carlo simulations was developed and tested.
To make it possible to irradiate liquids with electrons within scanning electron microscopes a new sample holder was constructed incorporating an electron transparent nanomembrane.
It makes it possible to irradiate DNA, proteins or cells at different pH, salinity and in the presence of cosolutes.
%The most important results of this work are as follows:
The median lethal dose for a model system of plasmid DNA and water was determined by the combination of experimental data, particle scattering simulations (Geant4-DNA) and diffusion calculations as D0.5=(1.7+-0.3) Gy.
From the convolution of plasmid positions and the spatially resolved energy deposit, as determined by electron scattering simulations, the histogram of the energy deposit within the target volume of the plasmids and the microscopic median lethal energy deposit was calculated as E0.5=6+-4eV.
It could be deduced that on average less than two ionization events are sufficient to cause a single-strand-break.
The relation of single-strand-breaks (SSB) to double-strand-breaks (DSB), which is of importance for microdosimetric modeling, was determined as SSB:DSB = 12:1.
The presented method for the determination of microscopic dose-damage relations was further extended to be applicable for general irradiation experiments.
It becomes independent of the type of primary radiation used, the experimental geometry, and the diffusional properties of the molecules under investigation.
This way different experimental systems with varying, inhomogeneous energy deposit characteristics become comparable with each other, which is not possible when only macroscopic averaged values are taken into account.
In addition, the radiation protection properties of the compatible solute ectoine, as well as its influence on the water properties and biomolecules were investigated.
%In addition, the influence of the compatible solute ectoine on water, biomolecules and its radiation protection properties were investigated.
Raman spectroscopy revealed a concentration dependent increase of the collective water modes in the OH-stretching region, which was found to be independent of the sodium chloride concentration.
Molecular dynamic simulations showed that the zwitterionic properties of ectoine lead to its half-chair conformation.
The hydrogen bonds in the first hydration shell are more stable and have an increased lifetime compared to the bulk water.
Irradiation experiments with DNA in the presence of 1M ectoine revealed an increase of the survival rate by a factor of 1.41 as compared to the absence of ectoine.
The protective properties of ectoine result from the increase of the inelastic scattering probabilities of low energy electrons at the acoustic vibrational modes of water and its properties as OH-radical scavenger.
This was shown by Raman spectroscopy and electron paramagnetic resonance measurements (EPR).
Der Vortrag widmet sich der „ELLIPSOMETRISCHE KLASSIFIZIERUNG VON KOHLENSTOFFSCHICHTEN“ und beschreibt die Punkte: 1. Anwendungen Kohlenstoffschichten–Carbon–based films (DLC) aus dem Vortrag N. Ohtakeet. al. (ISO TC 107, Tokyo 2017),2. Präparation der Kohlenstoffschichten für ISO TC 107 Ringversuch aus Vortrag M. Hiratsuka et. al. (ISO TC 107, Tokyo 2017), 3. Ellipsometrische Charakterisierung von Kohlenstoffschichten, Ergebnisse des Ringversuchs (ISO TC 107, Tokyo 2017) Vortrag Beck et. al. und 4.Deutsche Normungsaktivitäten national/international zur Ellipsometrie DIN NA 062-01-061 (DIN 50989-1)/TC 107 (PWI DE)“ im Einzelnen.
During the past few years significantly increasing research activities in the field of laser-induced periodic surface structures (LIPSS, ripples) have been reported since the generation of LIPSS in a single-step process provides a simple way of surface nanostructuring towards a control of optical, mechanical or chemical surface properties. In this contribution the current research state in this field is reviewed. The formation of LIPSS upon irradiation of metals, semiconductors and dielectrics by multiple linearly polarized Ti:sapphire fs-laser pulses (30-150 fs) is studied experimentally and theoretically. Different types of LIPSS with periods even below 100 nm can be generated. Their dynamics and formation mechanisms are analyzed and identified in ultrafast optical experiments. Complementing theoretical calculations of the laser-induced carrier dynamics address transient changes of the optical properties of the irradiated materials and reveal the importance of surface plasmon polaritons in the early stage of LIPSS formation. Various applications of these nanostructures are outlined.
One of the holy grails in chemistry is to reconstruct some of life’s functions with synthetic materials. In this contribution, we demonstrate that “simple” macromolecular architectures such as dendritic amphiphiles, Janus dendrimers, thermoresponsive and hybrid organic-inorganic (co)polymers enable to mimic some of the functions of proteins for biomineralization, natural bactericides, biological membranes or the stimuli-responsive cytoskeleton.
UCST-type thermoresponsive polymers (i.e. that phase separate from solution upon cooling) present a tremendous potential not only in aqueous media where they can be used in drug delivery, diagnostic and microfluidic applications, but also in water/alcohol mixtures, where they can be used for instance in sensing systems for alcohol-soluble drugs. However, only a few thermoresponsive polymers have been reported that present an UCST in a relevant temperature range and “green” solvents such as water or ethanol.
In this context, acrylamide-based monomers can be very useful building blocks for designing novel non-ionic UCST-type polymers because of their hydrophilic nature (with the appropriate side chain) and propensity to form hydrogen bonds. We will present our latest results on the UCST-type thermoresponsive behaviour of acrylamide- and 2,6-diaminopyridine-based homopolymers and copolymers in water or water/alcohol mixtures, and give some insights about the rational design of UCST polymers relying on H-bonding.
The paper addresses “WHITE LIGHT INTERFERENCE MICROSCOPY, ELLIPSOMETRY, AND INSTRUMENTED INDENTATION TESTING AS REFERENCE PROCEDURES“ and is subdivided in the following sections: 1. Measurement vs. testing vs. reference procedures, 2. White light interference microscopy (WLIM) for determination of step height h, 3. Spectroscopic ellipsometry (SE) for determination of layer thickness d and 4. Instrumented indentation testing (IIT) for determination of indentation hardness HIT. The following points are discussed in more detail: methodology of measurement and testing, uncertainty budgets for direct (WLIM), model-based (SE) and formula-based (IIT) reference procedures by means of specific examples. It is shown that standardization efforts are connected to reference procedures.
PTFE/PS core-shell-nanoparticles were characterised by STXM, T-SEM, and ToF-SIMS. Shell-thicknesses were calculated and compared. Preliminary results from ToF-SIMS showed the capabilities of this method.
The wear rates of self-amted alumina couples show that friction as well as wear is largely determined by the above mentioned hydro-thermal conditions. The presence of water and ist amount available in the surrounding system either in liquid or in gaseous from plays a key role for friction and wear behavior and cabe benefical for the tribological profile of steam degradation resistant materials. Hot steam enhances the tribo-chemical formations of oxides and hydroxides on MgO-ZrO2, alumina and antimony impregnated carbon.