ELEMENTAL COMPOSITION AND MORPHOLOGY OF SOLID PARTICLES IN INDUSTRIAL AIR

Objective. The aim of this prospective study is to evaluate presence and quantity of micro- and nanosized particles (NPs) and interindividual differences in their distribution and composition in nasal mucosa.Methods. Six samples of nasal mucosa obtained by mucotomy from patients with chronic hypertrophic rhinosinusitis were examined. Samples divided into 4 parts according to the distance from the nostrils were analyzed by scanning electron microscopy and Raman microspectroscopy to detect solid particles and characterize their morphology and composition. A novel method of quantification of the particles was designed and used to evaluate interindividual differences in distribution of the particles. The findings were compared with patients’ employment history.Results. In all the samples, NPs of different elemental composition were found (iron, barium, copper, titanium, etc.), predominantly in the parts most distant from nostrils, in various depths from the surface of the mucosa and interindividual differences in their quantity and composition were found, possibly in relation to professional exposition.Conclusions. This study has proven the possibility of quantification of distribution of micro- and nanosized particles in tissue samples and that the NPs may deposit in deeper layers of mucosa and their elemental composition may be related to professional exposition to the sources of NPs.

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Alterations of ultrastructure and elemental composition in cultured human epidermal keratinocytes after treatment with nitrofurazone and silver sulfadiazine

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100127803 ◽

1987 ◽

Vol 45 ◽

pp. 676-677

Author(s):

A. R. Crooker ◽

M. C. Myers ◽

T. L. Beard ◽

E. S. Graham

Keyword(s):

Electron Microscopy ◽

Elemental Composition ◽

Pyrolytic Carbon ◽

Human Keratinocytes ◽

Silver Sulfadiazine ◽

Epidermal Keratinocytes ◽

Human Epidermal Keratinocytes ◽

Culture Systems ◽

Cytotoxicity Endpoints

Cell culture systems have become increasingly popular as a means of screening toxic agents and studying toxic mechanisms of drugs and other chemicals at the cellular and subcellular levels. These in vitro tests can be conducted rapidly in a broad range of relevant mammalian culture systems; a variety of biological and biochemical cytotoxicity endpoints can be examined. The following study utilized human keratinocytes to evaluate the relative cytotoxicities of nitrofurazone (NF) and silver sulfadiazine (SS), the active ingredients of FURACIN(R) Topical Cream and SILVADENE(R) Cream, respectively. These compounds are anti-infectives used in the treatment of burn patients. Cell ultrastructure and elemental composition were utilized as cytotoxicity endpoints.Normal Human Epidermal Keratinocytes (HK) were prepared from the EpiPackTM culture system (Clonetics Corporation, Boulder, CO). For scanning electron microscopy (SEM) and transmission electron microscopy (TEM), cells were seeded on sterile 35 mm Falcon plastic dishes; for elemental microanalysis, cells were plated on polished pyrolytic carbon discs (E. Fullam, Latham, NY) placed in the culture dishes.

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Electron probe x-ray microanalysis and electron microscopy of amino acid absorption and transport by the small intestine: inhibition by chemical poisons and correlation to the elemental composition of the epithelial cells

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100142311 ◽

1986 ◽

Vol 44 ◽

pp. 134-135

Author(s):

A. J. Tousimis

Keyword(s):

Small Intestine ◽

Amino Acid ◽

Epithelial Cells ◽

Elemental Composition ◽

Isotope Labeling ◽

Structural Components ◽

X Ray ◽

Human Small Intestine ◽

Transport Studies

The elemental composition of amino acids is similar to that of the major structural components of the epithelial cells of the small intestine and other tissues. Therefore, their subcellular localization and concentration measurements are not possible by x-ray microanalysis. Radioactive isotope labeling: I131-tyrosine, Se75-methionine and S35-methionine have been successfully employed in numerous absorption and transport studies. The latter two have been utilized both in vitro and vivo, with similar results in the hamster and human small intestine. Non-radioactive Selenomethionine, since its absorption/transport behavior is assumed to be the same as that of Se75- methionine and S75-methionine could serve as a compound tracer for this amino acid.

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Calculation of settling velocity of small solid particles in stratified suspension flows

International Journal of Multiphase Flow ◽

10.1016/s0301-9322(97)88556-4 ◽

1996 ◽

Vol 22 ◽

pp. 145

Author(s):

Y Pyrkin

Keyword(s):

Settling Velocity ◽

Solid Particles ◽

Suspension Flows

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34. Size-Selective Elemental Composition Of Welding Fumes In Area Samples

10.3320/1.2758383 ◽

2004 ◽

Author(s):

J. Schnackenbeck ◽

S. Erdal ◽

T. Schoonover ◽

L. Conroy

Keyword(s):

Elemental Composition ◽

Welding Fumes

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Elemental composition of compact human bone correlated with the osteocyte network

Bone Abstracts ◽

10.1530/boneabs.5.p37 ◽

2016 ◽

Author(s):

Andreas Roschger ◽

Paul Roschger ◽

Felix Repp ◽

Wolfgang Wagermaier ◽

Richard Weinkamer ◽

...

Keyword(s):

Elemental Composition ◽

Human Bone

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Abrasive wear of polymer/steel gear drives

Progress in Agricultural Engineering Sciences ◽

10.1556/progress.4.2008.1 ◽

2008 ◽

Vol 4 (1) ◽

pp. 1-26

Author(s):

Gábor Kalácska

Keyword(s):

Wear Resistance ◽

Abrasive Wear ◽

Material Selection ◽

Solid Particles ◽

Soil Types ◽

General View ◽

Modern Engineering ◽

Clean Environment ◽

Engineering Polymers ◽

Plastic Gears

Research was performed on the friction, wear and efficiency of plastic gears made of modern engineering polymers and their composites both in a clean environment (adhesive sliding surfaces) and in an environment contaminated with solid particles and dust (abrasive), with no lubrication at all. The purpose is to give a general view about the results of abrasive wear tests including seven soil types as abrasive media. At the first stage of the research silicious sand was applied between the meshing gears and the wear of plastic and steel gears was evaluated and analyzed from the point of different material properties (elongation at break, hardness, yield stress, modulus of elasticity) and its combinations. The different correlations between the experienced wear and material features are also introduced. At the second stage of the project the abrasive sand was replaced with different physical soil types. The abrasive wear of gears is plotted in the function of soil types. The results highlight on the considerable role of physical soil types on abrasive wear resistance and the conclusions contain the detailed wear resistance. The results offer a new tribology database for the operation and maintenance of agricultural machines with the opportunity of a better material selection according to the dominant soil type. This can finally result longer lifetime and higher reliability of wearing plastic/steel parts.

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