Analysis of the visible spectra of some sperm-whale ferrimyoglobin derivatives

The visible spectra of sperm-whale metmyoglobin and its fluoride, hydroxide, cyanide, azide, cyanate, formate, acetate, thiocyanate and nitrite derivatives were measured and resolved into Gaussian components. A linear correlation between the intensity of the band at 18500cm.−1 and the magnetic susceptibility is found, suggesting that the band is the β-band of the low-spin form. The analysed intensity of this band can be used to determine the relative proportions of the two spin states present. The spectra of the pure high-spin and low-spin components of each derivative can be reconstructed. Correlations between the energy of the near-infrared band and the visible bands of the high-spin form, and between the position and intensity of the 16000cm.−1 band, are demonstrated. The relationship between the position of the Soret band and the magnetic susceptibility can be explained in terms of the equilibrium between spin states.

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π-Topology and spin alignment in the photo-excited states of phenylanthracene-t-butylnitroxide radicals

Physical Chemistry Chemical Physics ◽

10.1039/c5cp05994a ◽

2015 ◽

Vol 17 (47) ◽

pp. 31646-31652 ◽

Cited By ~ 2

Author(s):

Yoshio Teki ◽

Sadaharu Miyamoto ◽

Kentaro Koide

Keyword(s):

Excited States ◽

High Spin ◽

Transient Absorption ◽

Spin Systems ◽

Spin States ◽

Spin Alignment ◽

Time Resolved ◽

High Spin States ◽

The Relationship

We have studied the relationship between the π-topology and the photo-excited high-spin states of π-conjugated spin systems, 9-anthracen-(3-phenyl-t-butylnitroxide) radical (1m) and 9-anthracen-(4-phenyl-t-butylnitroxide) radical (1p) systems, by time-resolved ESR and transient absorption spectroscopies.

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Studies on the Undecapeptide of Ferricytochrome c Using ESR, Mössbauer and Visible Spectroscopies

Zeitschrift für Naturforschung C ◽

10.1515/znc-1976-5-603 ◽

1976 ◽

Vol 31 (5-6) ◽

pp. 232-237 ◽

Cited By ~ 4

Author(s):

Sr. Rosemarie Nassif ◽

Celia Baumgartner ◽

Martha Sellers ◽

Leopold May

Keyword(s):

Electron Spin Resonance ◽

High Spin ◽

Equilibrium Mixture ◽

Low Ph ◽

Spin States ◽

Visible Spectroscopy ◽

Spin Resonance ◽

Visible Spectra ◽

Ferricytochrome C ◽

Spin Species

Abstract Undecapeptide of Ferricytochrome c, Electron Spin Resonance, Mössbauer Spectroscopy, Visible Spectroscopy The ESR, Mössbauer, and visible spectra of the undecapeptide of ferricytochrome c (H P p) were measured for both the solid peptide and solutions of the peptide at pH 1.5, 7, and 10. At the low pH, the iron exists in the H Pp in the high-spin species. At neutral and alkaline pHs, the low-spin ferric species predominate. The results of these measurements support the previous suggestions concerning the ligands in the fifth and sixth position of HPp at the neutral and alkaline pHs. The spectra of lyophilized preparations of HPp show the presence of both high and low-spin ferric species. The study of the Mössbauer spectra of the lyohilized preparations as function of temerature shows that there exists a spin-spin equilibrium between the two spin states. The relative amounts of the two components vary with the preparation. In these preparations there exist two components, one of which exists in the equilibrium mixture and the second in the high-spin form.

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Calculation of the aboveground carbon stocks with satellite data and statistical models integrated into the climatic parameters in the Alborz Mountain forests (northern Iran)

Journal of Forest Science ◽

10.17221/107/2019-jfs ◽

2019 ◽

Vol 65 (No. 12) ◽

pp. 493-503

Author(s):

Mohadeseh Ghanbari Motlagh ◽

Sasan Babaie Kafaky ◽

Asadollah Mataji ◽

Reza Akhavan

Keyword(s):

Satellite Data ◽

Near Infrared ◽

Elevation Gradient ◽

Carbon Stocks ◽

Distribution Range ◽

Climatic Parameters ◽

Infrared Band ◽

Northern Iran ◽

Aboveground Carbon ◽

The Relationship

The forest ecosystems of northern Iran in the Alborz Mountains with a wide distribution range have variations in the composition and types of the plants, soil, structure, carbon stocks and climatic conditions. This study investigated the use of a satellite database and climatic parameters in estimating the carbon reserves. Three regions were selected for the distribution range of these forests. The data of 4 climatic parameters (MAP, MHR, MAE and MAT) were modelled based on the relationship with an elevation gradient. 5 spectral vegetation indices (RVI, NDVI, SR, NDGI, DVI and TVI) and near-infrared band (NIR) extracted from the satellite data and the aboveground carbon data of these forests were modelled based on a regression analysis. Finally, the best model of the relationship between the climate variables and the carbon stocks and the satellite indices was obtained from the multivariate linear regression equation and the R2 coefficient. Accordingly, the most influential climatic parameters on the carbon stocks of these forests were precipitation, temperature, and also the most significant indices were NDVI, RVI and NIR band. This research is an attempt to model the calculations of the aboveground carbon in the forests of northern Iran in relation to the climatic parameters using satellite imagery.

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DESCRIPTION OF HIGH SPIN STATES

Le Journal de Physique Colloques ◽

10.1051/jphyscol:19801015 ◽

1980 ◽

Vol 41 (C10) ◽

pp. C10-143-C10-154 ◽

Cited By ~ 1

Author(s):

A. Faessler

Keyword(s):

High Spin ◽

Spin States ◽

High Spin States

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A Comparison of the Near‐Infrared and Visible Spectra of Three Bright Cepheids

The Astrophysical Journal ◽

10.1086/303997 ◽

1997 ◽

Vol 480 (2) ◽

pp. 767-776 ◽

Cited By ~ 10

Author(s):

R. Paul Butler ◽

Roger A. Bell

Keyword(s):

Near Infrared ◽

Visible Spectra

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A Preliminary Study on Dependence of Mercury Distribution on the Degree of Coalification in Ningwu Coalfield, Shanxi, China

Energies ◽

10.3390/en14113119 ◽

2021 ◽

Vol 14 (11) ◽

pp. 3119

Author(s):

Yinjiao Su ◽

Xuan Liu ◽

Yang Teng ◽

Kai Zhang

Keyword(s):

Linear Correlation ◽

Bituminous Coal ◽

Rank Correlation ◽

Correlation Coefficients ◽

Chemical Extraction ◽

Mercury Distribution ◽

Sequential Chemical Extraction ◽

Average Proportion ◽

Total Proportion ◽

The Relationship

Mercury (Hg) is a toxic trace element emitted from coal conversion and utilization. Samples with different coal ranks and gangue from Ningwu Coalfield are selected and investigated in this study. For understanding dependence of mercury distribution characteristics on coalification degree, Pearson regression analysis coupled with Spearman rank correlation is employed to explore the relationship between mercury and sulfur, mercury and ash in coal, and sequential chemical extraction method is adopted to recognize the Hg speciation in the samples of coal and gangue. The measured results show that Hg is positively related to total sulfur content in coal and the affinity of Hg to different sulfur forms varies with the coalification degree. Organic sulfur has the biggest impact on Hg in peat, which becomes weak with increasing the coalification degree from lignite to bituminous coal. Sulfate sulfur is only related to Hg in peat or lignite as little content in coal. However, the Pearson linear correlation coefficients of Hg and pyritic sulfur are relatively high with 0.479 for lignite, 0.709 for sub-bituminous coal and 0.887 for bituminous coal. Hg is also related to ash content in coal, whose Pearson linear correlation coefficients are 0.504, 0.774 and 0.827 respectively, in lignite, sub-bituminous coal and bituminous coal. Furthermore, Hg distribution is directly depended on own speciation in coal. The total proportion of F2 + F3 + F4 is increased from 41.5% in peat to 87.4% in bituminous coal, but the average proportion of F5 is decreased from 56.8% in peat to 12.4% in bituminous coal. The above findings imply that both Hg and sulfur enrich in coal largely due to the migration from organic state to inorganic state with the increase of coalification degree in Ningwu Coalfield.

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