Carcinogens asbestos fibres

Increased cancer risk caused by carcinogens in the work-place is also well-established. In addition to the effects of benzpyrene and other polycyclic aromatic compounds already mentioned, the high incidence of mesothelioma, a rare lung cancer amongst those exposed to the blue asbestos fibres is irrefutable. There is also good evidence that other cancers have been caused by such diverse chemicals as vinyl chloride (used in the manufacture... 

Two major developments have occurred in sheet manufacture. The first relates to concern about the carcinogenic properties of certain types of asbestos. In Britain, although most wines and spirits are now filtered through sheets free of asbestos, such replacement has been slower in the case of beers. Alternatives to charged asbestos fibres include aluminium oxide fibres and zirconium oxide fibres. A second development has been the incorporation of insoluble polyvinyl pyrrolidone (PVPP) into the sheet material which adsorbs phenolic materials from the beer, especially the tannin materials associated with beer haze. The PVPP can be regenerated by washing the sheet in a 0-5 % solution of sodium hydroxide at ambient temperatures. 

Asbestos fibre Down to 3 or better Effective as silt control filters, but decreasing apphcation because of possible carcinogenic rating. 

Conclusion with regard to stock of hypotheses and model The substitution process in the constraction industry had the effect of providing impulses ( Cross-adaptation - Hypothesis 5). Automotive manufacturers as brand manufacturers ate especially vulnerable to scandals. Concerning carcinogenic fibres it must be assumed that the public and therefore also car buyers were highly sensitised due to the asbestos problem ( Emotional drivers - Hypothesis 4). 

Tilkes F, Beck EG. 1989. Cytotoxicity and carcinogenicity of chrysotile fibres from asbestos-cement products. lARC Sci Pub 90 190-196. 

Quinazoline is deuterated preferentially in positions 2 and 4 on heating with deuterium oxide and platinized short-fibre asbestos (Caution carcinogenic) in a sealed tube or pressure vessel at 130 250 C. ° Deuteration of 7-amino-6-nitroquinazolin-4(3/y)-one (1) in [ Hjmethanol under reflux yields product 2 deuterated in position 8, whereas in 6,7-diaminoquinazolin-4(377)-one (3), on treatment with deuterium oxide in dimethylformamide, 5H and 8H are exchanged for deuterium to give the deuterated derivative 4. ° ... 

Asbestos (anthophyllite, tremolite-actinolite, amosite, crocidolite, chrysotile), nonasbestos fibres Analytical electron microscopy of 50 lung tissue samples from Matsubase, where pleural plaques are endemic Number of asbestos bodies and fibres/ 5 g wet lung tissue frequency of pleural plaques size parameter of fibres Dy mineral type Anthophyllite (mean length 25.1 n, mean diameter 0.84 (un) might be responsible for the increased prevalence of pleural plaques in Matsubase. The aspect ratio of anthophyllite (mean = 38.7) was lower than that of amosite (mean = 81.8), which, as reported hy Murai and Kitagawa (1992), was found predominantly in cases of pleural mesothelioma. Murai et al. (1997) Differences in fibre size may be related to the strength of the carcinogenicity to the pleura. 

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