The Features of Mössbauer Spectra of Hemoglobin in Relation to the Quadrupole Splitting and Heme Iron Stereochemistry

1998 ◽  
Vol 53 (6-7) ◽  
pp. 608-614 ◽  
Author(s):  
M. I. Oshtrakh
Keyword(s):  
Quadrupole Splitting ◽  
Line Width ◽  
Line Shape ◽  
Mössbauer Spectra ◽  
Heme Iron ◽  
Mossbauer Spectra ◽  
Lorentzian Line ◽  
Hemoglobin Tetramer ◽  
Lorentzian Line Shape ◽  
Heme Iron Stereochemistry

Abstract Mössbauer spectra of various human ferrous hemoglobins in different ligand forms demonstrated some features such as non-Lorentzian line shape for oxyhemoglobins, narrower line width for carbonmonoxide, and variations of quadrupole splitting for different hemoglobins. These features were considered in relation to the variations of quadrupole splitting and heme iron stereochemistry in different hemoglobins as well as in non-equivalent subunits of hemoglobin tetramer.

scholarly journals Variation of Quadrupole Splitting in Modified Oxyhemoglobin: A Mössbauer Effect Study

2000 ◽  
Vol 55 (1-2) ◽  
pp. 193-198 ◽  
Author(s):  
M. I. Oshtrakh ◽  
O. B. Milder ◽  
V. A. Semionkin ◽  
A. L. Berkovsky ◽  
M. A. Azhigirova ◽  
...  
Keyword(s):  
Quadrupole Splitting ◽  
Mössbauer Spectra ◽  
Effect Study ◽  
Heme Iron ◽  
Mossbauer Effect ◽  
Frozen Solution ◽  
Mossbauer Spectra ◽  
Human Adult ◽  
Adult Hemoglobin ◽  
Α And Β Subunits

Human adult hemoglobin modified by both pyridoxal-5'-phosphate and glutaraldehyde in the oxy-form was studied by Mössbauer spectroscopy. Mössbauer spectra were measured at 87 and 295 K (hemoglobin in lyophilized form) and at 87 K (hemoglobin in frozen solution). The values of the quadrupole splitting for modified oxyhemoglobin were found to be lower then those of oxyhemoglobin without modifications in lyophilized form and frozen solution, respectively. The Mössbauer spectra of modified oxyhemoglobin were also analyzed in terms of the heme iron inequivalence in α-and β-subunits of the tetramer. Differences of the tendencies of temperature dependencies of quadrupole splitting for modified and non-modified oxyhemoglobin in lyophilized form were shown.

MossA: a program for analyzing energy-domain Mössbauer spectra from conventional and synchrotron sources

2012 ◽  
Vol 45 (2) ◽  
pp. 329-331 ◽  
Author(s):  
Clemens Prescher ◽  
Catherine McCammon ◽  
Leonid Dubrovinsky
Keyword(s):  
Line Shape ◽  
Amorphous Materials ◽  
Mössbauer Spectra ◽  
Hyperfine Parameters ◽  
Synchrotron Source ◽  
User Input ◽  
Mossbauer Spectra ◽  
Lorentzian Line ◽  
Energy Domain ◽  
Straightforward Approach

The programMossAprovides a straightforward approach to the fitting of57Fe conventional and synchrotron energy-domain Mössbauer spectra. Sites can be defined simply by mouse clicks and hyperfine parameters can be constrained to constant values, within specific ranges, and can be coupled linearly between different subspectra. The program includes a full transmission integral fit with Lorentzian line shape (conventional source) or Lorentzian-squared line shape (synchrotron source). The fitting process is graphically displayed in real time while fitting and can be interrupted at any time. Gaussian-shaped quadrupole splitting distributions for analyzing nonmagnetic amorphous materials are included.MossAis designed especially for the rapid and comprehensive analysis of complex Mössbauer spectra, made possible by its native graphical user input.

The Mössbauer spectra of hydroxycarbonate green rusts

Clay Minerals ◽  
1984 ◽  
Vol 19 (1) ◽  
pp. 77-83 ◽  
Author(s):  
E. Murad ◽  
R. M. Taylor
Keyword(s):  
Quadrupole Splitting ◽  
Mössbauer Spectra ◽  
Paramagnetic State ◽  
Type Structure ◽  
Natural Systems ◽  
Mossbauer Spectra ◽  
Green Rusts ◽  
Cation Arrangement ◽  
Excess Fe

AbstractMössbauer spectra of Fe2+Fe3+ and Fe2+Al hydroxycarbonates taken in the paramagnetic state were fitted using two Fe2+ and Fe3+ doublets each. These spectra can be interpreted in terms of an ordered cation arrangement in the pyroaurite-type structure. The inner Fe2+ doublet seems to be the outcome of excess Fe3+ in the samples studied. The outer Fe2+ doublet (quadrupole splitting ∼2·8 mm s−1, FWHM = 0·26 mm s−1) is relatively well-defined and can, together with the fact that this doublet disappears on oxidation, possibly serve to identify these compounds in natural systems.

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