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Coal exposed to an air atmosphere absorbs the atmospheric oxygen; this involves physical adsorption and chemisorption to form surface oxides (including hydro-peroxides). These weathering processes, which are denoted as LTO (Low Temperature Oxidation), decrease the calorific value of the coal and emit different gases such as carbon oxides (CO, CO2), water vapor, hydrogen (H2), and also some low-molecular-weight organic gases (C1-5). Some of these gases are toxic and flammable. The mechanism by which the molecular oxygen interacts with the coal macromolecule is thought to occur in several steps. The main concept is that a chain of radical reactions takes place; however, the exact underlying mechanism is not yet clear. We succeeded in identifying various carbon-centered radical species, depending on the coal rank and the degree of oxidation and suggested a new scheme for the formation of radicals via the coal oxidation process.
This article was published in the following journal.
Name: Physical chemistry chemical physics : PCCP
Recently, long-lived, organic radical species have attracted much attention from chemists and material scientists because of their unique electronic properties derived from their magnetic spin and sin...
Organocobalt(III) complexes (R-Co), defined as cobalt complexes featuring a carbon-cobalt bond, are largely used to produce carbon-centered radicals by homolytic cleavage of their C-Co bond under mild...
This review presents data showing the possibility of novel pathways to be realized for free-radical transformations of glycerophospholipids and sphingolipids. These transformations include the stages ...
Ruthenium-catalyzed meta C-H activation of arenes at room temperature is reported, under blue light irradiation. A variety of heteroarenes are compatible with this photochemical process, which leads t...
Alkoxy radicals derived from cyclic hemiacetals have been generated through visible light-promoted reaction of the corresponding N-alkoxyphthalimides with Hantzsch ester as the reductant. The alkoxy r...
Human exercise capacity decreases with aging. One explanation may be that blood vessels stiffen with age and release less of a compound called nitric oxide (NO). This compound normally r...
Introduction: While growing older, it is possible to notice a decrease in the functional and physiological reserves in the organism which impairs the the abilities in the elderly in doing ...
This study will examine the relationship between free radicals in the saliva and periodontitis. 30 adults, 15 with periodontitis and 15 as a control group will give a sample of saliva befo...
This study plans to examine biological bases of cognitive aging. The goals of the study are to better understand how immune system markers, measured in the blood and in the spinal fluid, a...
The aging of skin, especially that of the scalp, is a combination of intrinsic and extrinsic aging factors secondary to the chronic sun exposure. For men with an alopecia genetic (= bald m...
The process of aging due to changes in the structure and elasticity of the skin over time. It may be a part of physiological aging or it may be due to the effects of ultraviolet radiation, usually through exposure to sunlight.
Highly reactive molecules with an unsatisfied electron valence pair. Free radicals are produced in both normal and pathological processes. They are proven or suspected agents of tissue damage in a wide variety of circumstances including radiation, damage from environment chemicals, and aging. Natural and pharmacological prevention of free radical damage is being actively investigated.
The major metabolite in neutrophil polymorphonuclear leukocytes. It stimulates polymorphonuclear cell function (degranulation, formation of oxygen-centered free radicals, arachidonic acid release, and metabolism). (From Dictionary of Prostaglandins and Related Compounds, 1990)
Component of the NATIONAL INSTITUTES OF HEALTH. Through basic and clinical biomedical research and training, it conducts and supports research into the nature of the aging process and diseases associated with the later stages of life. The Institute was established in 1974.
A curriculum-centered process of equipping individuals with professional knowledge and skills required to become effective teachers.