Search results for "ESR"

Analysis of the spatial distribution of free radicals in ammonium tartrate by pulse EPR techniques

2009

Using pulse electron paramagnetic resonance (EPR) on a series of l(+)-ammonium tartrate (AT) dosimeters exposed to radiations with different linear energy transfer (LET), we assessed the ability of pulse EPR spectroscopy to discriminate the quality of various radiation beams such as (60)Co gamma-ray photons, protons and thermal neutrons at various doses by analyzing the local radical distributions produced by the different beams. We performed two types of pulse EPR investigations: two-pulse electron spin echo decay obtained by varying the microwave power, and a double electron-electron resonance (DEER) study. Both methods provide information about the dipolar interactions among the free rad…

Fricke gel, electron spin resonance and thermoluminescence for integration and intercomparison of measurements in NCT dosimetry

2014

El capitalismo, contra el planeta / 4

2007

Comparison of EPR response of pure alanine and alanine with gadolinium dosimeters exposed to TRIGA Mainz reactor

2015

The development of Neutron Capture Therapy (NCT) for cancer treatments has stimulated the research for beam characterization in order to optimize the therapy procedures. The NCT has found to be promising for treatments of tumours which hardly can be treated with other techniques, such as gliomas. Alongside with the improvements of this technique, the development of procedures for the beam characterization arouses great interest in order to optimize the therapy protocol by reliably determining the various (neutronic and photonic) components of the mixed beam usually employed for therapy. Electron Paramagnetic Resonance (EPR) dosimetry for electron and photon beams with alanine has attracted …

Histone-mediated transgenerational epigenetics

2019

Abstract Epigenetic mechanisms operate at the interface between the environment and genome, by converting the environmental stimuli to phenotypic responses through changes in the chromatin landscape, which ultimately affects gene expression in the absence of alterations in DNA sequence. In this scenario, transgenerational inheritance occurs when epigenetic variations induced by environmental stimuli are transmitted through the germ line to succeeding generations that had never experienced those stimuli. There is an ever-growing list of reports indicating that histones are fundamental players in these processes in a variety of organisms. In this chapter, we provide a perspective on histone-d…

El “Prestige” y otras fechorías

2003

Zur kurländischen Reformfrage: offener Brief an Herrn Edmund von Heyking, Redacteur der Zeitung für Stadt und Land, Verfasser vieler censurfreier Lei…

1879

Gotiskajā šriftā

THE EFFECT OF GADOLINIUM ON THE ESR RESPONSE OF ALANINE AND AMMONIUM TARTRATE EXPOSED TO THERMAL NEUTRONS

2008

Many efforts have been made to develop neutron capture therapy (NCT) for cancer treatment. Among the challenges in using NCT is the characterization of the features of the mixed radiation field and of its components. In this study, we examined the enhancement of the ESR response of pellets of alanine and ammonium tartrate with gadolinium oxide exposed to a thermal neutron beam. In particular, the ESR response of these dosimeters as a function of the gadolinium content inside the dosimeter was analyzed. We found that the addition of gadolinium improves the sensitivity of both alanine and ammonium tartrate. However, the use of gadolinium involves a reduces in or abolishes tissue equivalence b…

Emosjonelt arbeid blant frontlinjeansatte : Hvordan opplever og håndterer nav-ansatte det emosjonelle arbeidet de utøver på jobb?

2017

Masteroppgave Sosiologi og sosialt arbeid ME522 - Universitetet i Agder 2017 Formålet med denne oppgaven er å få en forståelse for det emosjonelle arbeidet som frontlinjeansatte på nav utøver. Fokuset er å belyse både hvordan de opplever og hvordan de håndterer ulike situasjoner de kommer opp i. Oppgaven er basert på intervjuer og observasjoner av totalt 13 ansatte på et lokalt nav-kontor som arbeider tett med brukere innenfor ulike avdelinger. Med utgangspunkt i datamaterialet, analyseres innholdet først før det blir drøftet opp mot teori. Teoriene til Erving Goffman og Arlie Hochschild blir brukt bevisst gjennom hele oppgaven for å få frem ulike momenter ved emosjonsarbeidet og selve møte…

Laser spectroscopy measurement of the 2s-hyperfine splitting in lithium-like bismuth

2017

We have recently reported on the first direct measurement of the $2s$ hyperfine transition in lithium-like bismuth (209Bi80+) at the GSI Helmholtz Centre for Heavy Ion Research in Darmstadt, Germany. Combined with a new measurement of the $1s$ hyperfine splitting (HFS) in hydrogen-like (209Bi82+) the so-called specific difference ${\rm{\Delta }}^{\prime} E=-61.37(36)$ meV could be determined and was found to be in good agreement with its prediction from strong-field bound-state quantum electrodynamics. Here we report on additional investigations performed to estimate systematic uncertainties of these results and on details of the experimental setup. We show that the dominating uncertainty a…