The release of asbestos fibers from vinyl-asbestos floor tiles

1988 ◽  
Vol 46 ◽  
pp. 968-969
Author(s):  
H.S. MacDonald ◽  
V. M. Kushnaryov ◽  
S. Kolinski ◽  
M. Gallun
Keyword(s):  
Light Microscopy ◽  
Polarized Light ◽  
Polarized Light Microscopy ◽  
Drill Bit ◽  
Asbestos Fibers ◽  
Floor Tiles ◽  
Materials Used ◽  
Set Up

There have been extensive studies of the release of asbestos fibers from friable materials used for construction. To date very little is known about the release of asbestos fibers from materials we assume to be non-friable. Since one of the major uses of asbestos was in the manufacture of floor tiles, and flooring is scoured prior to applying sealants, we have studied the release of asbestos from tiles treated in ways which model the processes tiles would be subjected to over their time of use.Vinyl-asbestos tiles were gathered and assayed for their asbestos content by TEM and polarized light microscopy (PLM). Containments were set up and the following experiments performed: 1. 9 inch square tiles were drilled 10 times with a 3/4 inch drill 2. tiles were drilled once with the drill bit above 3. tiles were boken into 1 1/2 inch pieces 4. tiles were broken into 4 pieces 5. tiles were stripped, and then coated with sealants prior to further scrubbing.

An in vitro Evaluation of Artificial Caries-like Lesions on Restored Overdenture Abutments

1988 ◽  
Vol 67 (3) ◽  
pp. 582-584 ◽  
Author(s):  
P.P. Kambhu ◽  
R.L. Ettinger ◽  
J.S. Wefel
Keyword(s):  
Light Microscopy ◽  
Polarized Light ◽  
Polarized Light Microscopy ◽  
The Other ◽  
Type Ii ◽  
Restorative Materials ◽  
Abutment Teeth ◽  
The Mean ◽  
Materials Used

An acidified dialyzed gelatin gel system was used to determine the caries resistance of a variety of restorative materials used to obturate the canal orifice of overdenture abutment teeth. The restorative materials used were Tytin, Tytin + Copalite, P30 + Scotchbond, Fuji Ionomer-Type II, and Miracle Mix. Polarized light microscopy and microradiography were used to examine the caries-like lesions adjacent to the restorations. The lesions formed in the Fuji Ionomer-Type II and Miracle Mix groups appeared arrested at the wall adjacent to the restoration, and did not penetrate apically down the wall as did those associated with the other restorative materials. The mean depths of lesions adjacent to Fuji Ionomer-Type II and Miracle Mix restorations were significantly less than those of Tytin, Tytin + Copalite, or P30 + Scotchbond.

scholarly journals Assessment of the Elements and Oxides Concentration in the Dust of Asbestos Used in Roofs of Houses in Al-Qalluah Town, Yemen: تقدير تركيز العناصر والأكاسيد في غبار أسقف الأسبستوس المستخدمة في منازل بلدة القلوعة، اليمن

2020 ◽  
Vol 4 (2) ◽  
Author(s):  
Tahir Abdullah Abdulgabbar Salem, Adel Ahmed Mohammed Saeed
Keyword(s):  
Lung Cancer ◽  
Quantitative Analysis ◽  
Light Microscopy ◽  
Human Health ◽  
Polarized Light ◽  
Polarized Light Microscopy ◽  
Research Center ◽  
Asbestos Fibers ◽  
Asbestos Cement ◽  
The Mean

In this research we evaluated elements and oxides concentration of corrugated asbestos cement used in the roofs of houses in Al-Qalluah area- Aden city, Yemen in the period from August to September 2018. In Aden city, many houses were built between 1880 and 1990 and therefore corrugated asbestos cement roofs as one type of asbestos boards, were used widely in coverage of the buildings and garages. Airborne asbestos fibers may remain suspended in the air for some time and can be carried long distances by wind before settling down. The risk of developing asbestos-related diseases, like lung cancer, is associated with the level and duration of exposure. All the dust samples collected from different sites in Al-Qalluah area were sent to the National Research Center- Cairo and analyzed by QUANTA FEG 250 polarized-light microscopy (PLM), using the EPA 600/R-93/116 method. The overall results of scanning PLM for dust samples have shown fibers of asbestos with diameter ranged between 2.634-22.49μm. PLM quantitative analysis coupled with EDAX TEAM have found the mean concentrations 39, 36.5, 19.2, 31.8, 36.7 and 28.4 wt/wt% with respect to C, O, Mg, Al, Si, and Ca, while the mean concentrations of oxides CO2, MgO, Al2O3, SiO2, CaO, SO3, Fe2O3, K2O and Cl2O, were 46.4, 13.6, 34.8, 47.5, 29.0, 29.1, 31.5, 32.0 and 43.8 wt/wt% respectively. Asbestos boards should be encapsulated by a safe material to prevent or reduce their risks and the authorities should stop asbestos impacts on the environment and human health.                                                             

scholarly journals Polarized Light Microscopy Coupled with Electron Backscatter Diffraction for 3D Serial Sectioning of Large Volumes of Twinned Titanium

2021 ◽  
Vol 27 (S1) ◽  
pp. 30-32
Author(s):  
Rodney McCabe ◽  
Danel Savage ◽  
Renuka Gogusetti ◽  
Abhishek Bhattacharyya ◽  
David Alexander
Keyword(s):  
Light Microscopy ◽  
Electron Backscatter Diffraction ◽  
Polarized Light ◽  
Polarized Light Microscopy ◽  
Serial Sectioning ◽  
Electron Backscatter ◽  
Backscatter Diffraction

Ferroelastic domains and phase transitions in organic–inorganic hybrid perovskite CH3NH3PbBr3

2021 ◽  
Author(s):  
Maryam Bari ◽  
Alexei A. Bokov ◽  
Zuo-Guang Ye
Keyword(s):  
Phase Transitions ◽  
Electric Field ◽  
Light Microscopy ◽  
Domain Structure ◽  
Polarized Light ◽  
External Stress ◽  
Polarized Light Microscopy ◽  
Inorganic Hybrid ◽  
Hybrid Perovskite ◽  
Ferroelastic Domains

Polarized light microscopy reveals twin domains and symmetry of the phases in CH3NH3PbBr3 crystal; domain structure remains unresponsive to electric field but changes under external stress, confirming ferroelasticity while ruling out ferroelectricity.

scholarly journals Exploiting the Binocular Head in Polarized Light Microscopy

1994 ◽  
Vol 2 (4) ◽  
pp. 16-16
Author(s):  
Walter C. McCrone
Keyword(s):  
Light Microscopy ◽  
Polarized Light ◽  
Polarized Light Microscopy ◽  
The Other ◽  
Monocular Viewing ◽  
Area Of Interest

Having been brought up on monocular microscopes I find the omnipresent binocular systems a luxury. To support this viewpoint I'd like to suggest some benefits you may not have considered.Because I'm used to monocular viewing I sometimes use two different oculars, say 10X and 25X, in order to scan quickly to find an area of interest and then to examine the detail with higher magnification. Occasionally I use both oculars simultaneously and “concentrate” on either image to the exclusion of the other. A better way is to set the interocular distance at the extreme setting most different from your own interocular distance. By moving your head about a centimeter either way you can use either ocular.

Structural Morphology of Rabbit Patella and Suprapatella Cartilage by Microscopic MRI and Polarized Light Microscopy

Cartilage ◽  
2021 ◽  
pp. 194760352199088
Author(s):  
Hannah Mantebea ◽  
Syeda Batool ◽  
Mouhamad Hammami ◽  
Yang Xia
Keyword(s):  
Articular Cartilage ◽  
Light Microscopy ◽  
Design Method ◽  
Strong Dependence ◽  
Polarized Light ◽  
Polarized Light Microscopy ◽  
Structural Morphology ◽  
Pixel Resolution ◽  
Patellar Cartilage ◽  
Quantitative Results

Objective In order to appreciate the roles articular cartilage of sesamoid bones and sesamoid fibrocartilage play in anatomy and pathology, the articular cartilage of the patella ( n = 4) and suprapatella ( n = 4) (a sesamoid fibrocartilage) of 12 to 14 weeks old New Zealand rabbits were studied qualitatively and quantitatively. Design/Method The intact knee joints and block specimens from the joints were imaged using microscopic magnetic resonance imaging (µMRI) at a 97.6-µm pixel resolution for the former and 19.5-µm resolution for the latter. Histological sections were made out of the µMRI-imaged specimens, which were imaged using polarized light microscopy (PLM) at 0.25-, 1-, and 4-µm pixel resolutions. Results The patella cartilage varied in thickness across the medial to lateral ends of the sesamoid bone with the central medial aspect slightly thicker than the lateral aspect. The suprapatella fibrocartilage decreased proximally away from the knee joint. Quantitative results of patellar cartilage showed strong dependence of fiber orientation with the tissue depth. Three histological zones can be clearly observed, which are similar to articular cartilage from other large animals. The sesamoid fibrocartilage has one thin surface layer (10 µm thick) of parallel-arranged structured fibers followed immediately by the majority of random fibers in bulk tissue. T2 relaxation time anisotropy was observed in the patellar cartilage but not in the bulk fibrocartilage. Conclusion Given the different functions of these 2 different types of cartilages in joint motion, these quantitative results will be beneficial to future studies of joint diseases using rabbits as the animal model.

Threads of Evidence: Polarized Light Microscopy for Funerary Textile Identification from an Eighteenth and Nineteenth Century Philadelphia Burial Ground

2021 ◽  
Author(s):  
George M. Leader ◽  
Philip De Paola ◽  
Laura Mina ◽  
Sophia Hayda ◽  
Kimberlee Sue Moran ◽  
...  
Keyword(s):  
Nineteenth Century ◽  
Light Microscopy ◽  
Polarized Light ◽  
Polarized Light Microscopy ◽  
Burial Ground

High-Resolution Fiber and Fiber Tract Imaging Using Polarized Light Microscopy in the Human, Monkey, Rat, and Mouse Brain

2016 ◽  
pp. 369-389 ◽  
Author(s):  
Karl Zilles ◽  
Nicola Palomero-Gallagher ◽  
David Gräßel ◽  
Philipp Schlömer ◽  
Markus Cremer ◽  
...  
Keyword(s):  
High Resolution ◽  
Light Microscopy ◽  
Mouse Brain ◽  
Polarized Light ◽  
Polarized Light Microscopy ◽  
Fiber Tract
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