You need JavaScript to view this

Sulfur K-edge absorption spectroscopy on selected biological systems; Schwefel-K-Kanten-Absorptionsspektroskopie an ausgewaehlten biologischen Systemen

Abstract

Sulfur is an essential element in organisms. In this thesis investigations of sulfur compounds in selected biological systems by XANES (X-ray Absorption Near Edge Structure) spectroscopy are reported. XANES spectroscopy at the sulfur K-edge provides an excellent tool to gain information about the local environments of sulfur atoms in intact biological samples - no extraction processes are required. Spatially resolved measurements using a Kirkpatrick-Baez mirror focusing system were carried out to investigate the infection of wheat leaves by rust fungi. The results give information about changes in the sulfur metabolism of the host induced by the parasite and about the extension of the infection into visibly uninfected plant tissue. Furthermore, XANES spectra of microbial mats from sulfidic caves were measured. These mats are dominated by microbial groups involved in cycling sulfur. Additionally, the influence of sulfate deprivation and H{sub 2}S exposure on sulfur compounds in onion was investigated. To gain an insight into the thermal degradation of organic material the influence of roasting of sulfur compounds in coffee beans was studied. (orig.)
Publication Date:
Jul 15, 2008
Product Type:
Thesis/Dissertation
Report Number:
BONN-IR-2008-10
Resource Relation:
Other Information: TH: Diss.
Subject:
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; ORGANIC SULFUR COMPOUNDS; ABSORPTION SPECTROSCOPY; X-RAY SPECTRA; ABSORPTION SPECTRA; X-RAY SPECTROSCOPY; SPATIAL RESOLUTION; MIRRORS; OPTICAL SYSTEMS; X-RAY EQUIPMENT; METABOLISM; PLANT TISSUES; WHEAT; MICROORGANISMS; SULFATES; HYDROGEN SULFIDES; ONIONS; BIOLOGICAL MATERIALS; COFFEE BEANS; ROASTING; X-RAY DETECTION; KEV RANGE 01-10
OSTI ID:
21102700
Research Organizations:
Bonn Univ. (Germany). Physikalisches Inst.; Bonn Univ. (Germany). Mathematisch-Naturwissenschaftliche Fakultaet
Country of Origin:
Germany
Language:
German
Other Identifying Numbers:
Other: ISSN 0172-8741; TRN: DE08FB972
Availability:
Available from TIB Hannover; Commercial reproduction prohibited; INIS; OSTI as DE21102700
Submitting Site:
DEN
Size:
115 pages
Announcement Date:
Jan 01, 2009

Citation Formats

Lichtenberg, Henning. Sulfur K-edge absorption spectroscopy on selected biological systems; Schwefel-K-Kanten-Absorptionsspektroskopie an ausgewaehlten biologischen Systemen. Germany: N. p., 2008. Web.
Lichtenberg, Henning. Sulfur K-edge absorption spectroscopy on selected biological systems; Schwefel-K-Kanten-Absorptionsspektroskopie an ausgewaehlten biologischen Systemen. Germany.
Lichtenberg, Henning. 2008. "Sulfur K-edge absorption spectroscopy on selected biological systems; Schwefel-K-Kanten-Absorptionsspektroskopie an ausgewaehlten biologischen Systemen." Germany.
@misc{etde_21102700,
title = {Sulfur K-edge absorption spectroscopy on selected biological systems; Schwefel-K-Kanten-Absorptionsspektroskopie an ausgewaehlten biologischen Systemen}
author = {Lichtenberg, Henning}
abstractNote = {Sulfur is an essential element in organisms. In this thesis investigations of sulfur compounds in selected biological systems by XANES (X-ray Absorption Near Edge Structure) spectroscopy are reported. XANES spectroscopy at the sulfur K-edge provides an excellent tool to gain information about the local environments of sulfur atoms in intact biological samples - no extraction processes are required. Spatially resolved measurements using a Kirkpatrick-Baez mirror focusing system were carried out to investigate the infection of wheat leaves by rust fungi. The results give information about changes in the sulfur metabolism of the host induced by the parasite and about the extension of the infection into visibly uninfected plant tissue. Furthermore, XANES spectra of microbial mats from sulfidic caves were measured. These mats are dominated by microbial groups involved in cycling sulfur. Additionally, the influence of sulfate deprivation and H{sub 2}S exposure on sulfur compounds in onion was investigated. To gain an insight into the thermal degradation of organic material the influence of roasting of sulfur compounds in coffee beans was studied. (orig.)}
place = {Germany}
year = {2008}
month = {Jul}
}