Another interesting study is called, Leaching of Constituents of Chrysotile Asbestos in vivo - Nature 215, 441 - 442 (22 July 1967); by A. Holmes & A. Morgan - Health Physics and Medical Division, Atomic Energy Research Establishment, Harwell, Didcot, Berkshire. Here is an excerpt: IN recent years, Wagner1 and Selikoff et al. 2 have shown that a rare tumour, the diffuse mesothelioma of the pleura and peritoneum, is associated with past exposure to asbestos. It appears that the amount of asbestos required to produce these tumours is small and that the latent period is very long. The connexion between exposure to asbestos and the production of mesotheliomas is being studied in a number of laboratories, and the possibility that trace metal constituents or contaminating oils may have a role has been suggested3. As yet, little is known about the fate of inhaled asbestos fibres and in particular about their movement out of the lung into other organs. The experiment described here was planned to assess the possibility of using radioactivity, induced in asbestos fibres by neutron irradiation, to trace their translocation in rats after administration by intrapleural injection.
Another study is called, Ferruginous bodies in sputa of former asbestos workers. By Farley ML, Greenberg SD, Shuford EH Jr, Hurst GA, Spivey CG, Christianson CS - Acta Cytol. 1977 Sep-Oct; 21(5):693-700. Here is an excerpt: Abstract - Routine cytopathologic examinations were performed at six-month intervals on sputum specimens from 628 former asbestos workers and 138 control patients. The occurrence of ferruginous bodies in sputa is found to increase as a logarithmic function of the length of occupational exposure to asbestos in workdays. No significant association is found between the occurrence of ferruginous bodies and the worker's age, smoking history, degree of cellular epithelial atypia, or time since last exposure. We conclude that the presence of ferruginous bodies in sputa is evidence of probable significant occupational exposure to asbestos dust. Their absence does not indicate lack of exposure. We can also conclude that routine cytopathology procedures are sufficient for the detection of ferruginous bodies in sputa.
If you found any of these excerpts interesting, please read the studies in their entirety. We all owe a debt of gratitude to these fine researchers.
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