Chemical properties of superfine pulverized coal particles. Part 1. Electron paramagnetic resonance analysis of free radical characteristics

Liu, Jiaxun; Jiang, Xiumin; Shen, Jun; Zhang, Hai

doi:10.1016/j.apt.2014.01.021

Cited by 108 publications

(60 citation statements)

References 29 publications

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“…Besides, the analysis of EPR spectra of superfi ne pulverized coal [15] showed the existence of four groups of paramagnetic centers in the studied samples, similar to the four groups of paramagnetic centers present in the coal macerals. According to the authors, the EPR spectra of the studied superfi ne pulverized coal [15] are the superposition of components lines generated by different groups of paramagnetic centers.…”

Section: Resultssupporting

confidence: 61%

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Determination of the fraction of paramagnetic centers not-fulfilling the Curie law in coal macerals by the two-temperature EPR measurement method

Słowik

Wiȩckowski

2015

Nukleonika

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Abstract. Two-temperature electron paramagnetic resonance (EPR) measurements, applied to determine the relative contributions of paramagnetic centers -fulfi lling and not-fulfi lling the Curie law, were carried out. The measurements were made on the macerals -exinite and vitrinite, separated from clarain of the Polish medium--rank coal (85.6 wt% C). The two-temperature EPR measurements, presented in this work, were performed respectively, at temperatures: T 1 = 293 K and T 2 = 173 K for exinite, and T 1 = 293 K and T 2 = 153 K for vitrinite. The relative contributions X of spins not-fulfi lling the Curie law present in the studied macerals were calculated. A comparison of different methods of calculating the relative contributions of paramagnetic centers -fulfi lling and not-fulfi lling the Curie law, present in exinite and vitrinite studied by EPR was made.

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Section: Resultssupporting

confidence: 61%

“…According to the authors, the EPR spectra of the studied superfi ne pulverized coal [15] are the superposition of components lines generated by different groups of paramagnetic centers. The lines can be fi tted by one Gaussian and three Lorentzian lines.…”

Section: Resultsmentioning

confidence: 99%

Determination of the fraction of paramagnetic centers not-fulfilling the Curie law in coal macerals by the two-temperature EPR measurement method

Słowik

Wiȩckowski

2015

Nukleonika

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“…The end product of free radicals is malonaldehyde (MDA) which can influence exchange of substances between cells, and finally lead to rupture and death of cells. [7][8][9][10] Various kinds of metabolic processes of substances in the body can lead to peroxidation of free radicals and thus cause an unbalance of free radicals. If accumulated damages caused by free radicals defeat recovery ability of the body, differentiation status of cells can be changed and differentiation capacity of cells may be destroyed, which finally results in skin aging.…”

Section: Introductionmentioning

confidence: 99%

Adipose stem cells’ antagonism in glycosylation of D-galactose-induced skin aging of nude mice and its skin recovery function

Wang

Wei

Xue

et al. 2016

Int J Immunopathol Pharmacol

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This study aims to discuss adipose stem cells' (ASCs) antagonism in glycosylation of D-galactose-induced skin aging of nude mice and its skin recovery function; the study also aims to explore a new mechanism of anti-aging to provide clinical anti-aging therapy with new thoughts and methods. We selected 40 healthy specific pathogen-free (SPF) nude mice and divided them randomly into four groups which were: blank control group; D-galactose + phosphate buffer saline (PBS) group; D-galactose + ASCs treatment group; and D-galactose + aminoguanidine (AG) group. Results showed that the superoxide dismutase (SOD) level of mice in the D-galactose-induced model group (87.15 ± 4.95 U/g) decreased significantly compared with that of control group (146.21 ± 4.76 U/g), while malonaldehyde (MDA) level of mice in D-galactose induced model group (11.12 ± 2.08 nmol/mg) increased significantly compared with that of control group (5.46 ± 2.05 nmol/mg) (P <0.05); thus D-galactose induced sub-acutely aging mice models were duplicated successfully. Results also indicated that transplantation of ASCs could reverse expression of aging-related biomarkers such as MDA, SOD, and advanced glycosylation end products (AGEs); hematoxylin and eosin (HE) staining showed that thickness of the dermis layer as well as the collagen content of mice in the D-galactose-induced model group increased significantly after ASC transplantation compared with that of control group. In addition, immunohistochemical assay showed that expression quantity of CD31 and vascular endothelial growth factor (VEGF) of mice in the D-galactose-induced model group increased significantly after ASC transplantation compared with that of control group. In conclusion, ASCs can trace cell distribution successfully through bioluminescence, and they survive for a short time in the skin after transplantation, which provides a basis for the application of ASC transplantation in clinical practices. Moreover, ASCs can control glycosylation level of D-galactose-induced skin aging of nude mice, reverse expression of aging-related biomarkers as well as restrain formation of advanced glycation end products, which are similar to the effects of AG inhibitors of advanced glycation end products. Thus, ASCs can prevent glycosylation-induced skin aging as well as recover functions of skin.

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“…The free-radical properties and distributions in superfine pulverized coals are applied here to explain this phenomenon. From our previous research [32,43], it is confirmed that there are mainly four types of radicals: simple aromatic hydrocarbons denoted as Gaussian type, oxygen-containing radicals as Lorentzian 1, hybrid type of aromatic and aliphatic hydrocarbons Lorentzian 2, and r type oxygen-containing radicals as Lorentzian 3. Therefore, the Lorentzian 2 type of radicals contributes to the major part of hydrogen-containing structures, which may play an important role as the hydrogen donors in the evolution of NH 3 .…”

Section: Influence Of Pyrolysis Atmosphere On the Nh 3 Formation Mechmentioning

confidence: 69%

“…This is because the heat and mass transfer resistance is lower, while reaction areas and activities are higher for smaller coal particles, which makes the thermal cracking be more intense. Besides, more hydroxyl groups such as OH-p, OH-OH and OH-ether exist in smaller coal particles due to the mechanochemistry effects [43]. However, with further decreasing particle sizes, the NO reduction reaction (see Eq.…”

Section: Influences Of Coal Type and Particle Size On The No Formatiomentioning

confidence: 99%

Pyrolysis of superfine pulverized coal. Part 3. Mechanisms of nitrogen-containing species formation

Liu

Jiang

Shen

et al. 2015

Energy Conversion and Management

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Chemical properties of superfine pulverized coal particles. Part 1. Electron paramagnetic resonance analysis of free radical characteristics

Cited by 108 publications

References 29 publications

Determination of the fraction of paramagnetic centers not-fulfilling the Curie law in coal macerals by the two-temperature EPR measurement method

Determination of the fraction of paramagnetic centers not-fulfilling the Curie law in coal macerals by the two-temperature EPR measurement method

Adipose stem cells’ antagonism in glycosylation of D-galactose-induced skin aging of nude mice and its skin recovery function

Pyrolysis of superfine pulverized coal. Part 3. Mechanisms of nitrogen-containing species formation

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