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Topic: Amosite

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	NTP: Abstract for TR-279 - Amosite Asbestos (Site not responding. Last check: 2007-11-01)
		Carcinogenesis studies of amosite asbestos alone or in combination with the intestinal carcinogen 1,2-dimethylhydrazine dihydrochloride (DMH) were conducted in male and female rats.
		Amosite asbestos was administered at a concentration of 1% in pelleted diet for the entire lifetime of the rats, starting with the dams of the study animals.
		However, the biologic significance of the C-cell carcinomas in relation to amosite asbestos exposure is discounted because of a lack of significance when C-cell adenomas and carcinomas were combined and because the positive effect was not observed in the amosite preweaning gavage group.
	ntp-server.niehs.nih.gov /index.cfm?objectid=0707304D-F1C4-EFA3-E9520193083BB91E (706 words)

	Mesothelioma gastrointestinal cancer in shipyard work
		Amosite, anthophyllite, chrysotile and crocidolite induced transformation of Syrian hamster embryo cells, chrysotile and crocidolite transformed BALB/c3T3 mouse cells, and chrysotile transformed rat mesothelial cells.
		In cultured rodent cells, amosite, anthophyllite, chrysotile and crocidolite induced chromosomal aberrations, and amosite, chrysotile and crocidolite induced sister chromatid exchanges; chrysotile and crocidolite induced aneuploidy and micronuclei.
		Amosite, chrysotile and crocidolite were inactive or weakly active in inducing mutation in rodent cells in vitro; none were mutagenic to bacteria [ref: 125].
	www.mesotheliomareference.com /mesothelioma_ref2.htm (760 words)

	NTP: Abstract for TR-249 - Amosite Asbestos (Site not responding. Last check: 2007-11-01)
		· Si Carcinogenesis studies of amosite asbestos were conducted by administering diets containing 1% of the asbestos in pellets from the conception of the mothers through the lifetime of male and female Syrian golden hamsters.
		Under the conditions of these studies, the ingestion of amosite asbestos at a level of 1% in the diet for their lifetime was not toxic and did not cause a carcinogenic response in male and female Syrian golden hamsters.
		Note: Amosite Asbestos was subsequently tested in F344 rats administered in feed (See TR-279, reported 1990).
	ntp.niehs.nih.gov /index.cfm?objectid=07069843-F009-19F0-5715CD42E21BFDD4 (266 words)

	AMOSITE (Site not responding. Last check: 2007-11-01)
		[Si Amosite (Brown Asbestos): Straight, brittle fibers that are light grey to pale brown (the most commonly used in thermal system insulation).
		Amosite exposed to high temperatures for a long period of time is referred to as heated amosite and may differ in colour and morphology from normal amosite.
		The colour of heated amosite typically ranges from a pale yellow to a reddish-brown colour in plane light.
	www.asbestossurveys.uklinux.net /amosite.htm (67 words)

	Amosite Asbestos - JustMeso.com (Print) (Site not responding. Last check: 2007-11-01)
		The long thin fibers of amosite are somewhat flexible and bend to form wide arches.
		Amosite asbestos was used less frequently in manufacturing plants in the United States than chrysotile asbestos.
		This type of asbestos was named "amosite" as a description of the source of the ore, "asbestos mines of South Africa".
	www.justmeso.com /asbestos/amosite.html?print=1 (200 words)

	Substance Profile for Asbestos as a known carcinogen
		The incidence of abdominal tumors was increased by intraperitoneal injection of crocidolite in hamsters and actinolite or tremolite in rats.
		Amosite is ash gray, greenish, or brown and is somewhat resistant to acids.
		Chrysotile, amosite, and particularly crocidolite all have extremely high tensile strengths and are used extensively as reinforcers in cements, resins, and plastics.
	www.weitzlux.com /asbestossubstanceprofile_468.html (3119 words)

	Asbestos and Disease
		Imports of Crocidolite and Amosite were banned as from 1986 and Chrysotile from1999.
		Amosite and Crocidolite have excellent heat resistant properties and were used as thermal insulators.
		Both these types of asbestos were extensively used in buildings, locomotives and railway carriages, however amosite was almost exclusively used for insulation purposes.
	www.asbestosadvice.co.uk /interest.htm (742 words)

	Micro Analytical Laboratories, Inc.
		The commercial asbestiform product used in building materials, commonly known as "amosite" (from the "Asbestos mines of South Africa") should thus be characterized as asbestiform grunerite.
		Amosite exposed to high temperatures for a long period of time is referred to as heated amosite and may differ in color and morphology from normal amosite.
		The color of heated amosite, typically ranges from a pale yellow to a reddish-brown color in plane light.
	www.labmicro.com /amosite.htm (415 words)

	RAIS: Asbestos (1332-21-4)
		Wagner (1963) exposed guinea pigs and Vervet monkeys to chrysotile and amosite dust at average concentrations of 30,000 particles/mL, respectively, for 8 hours/day, 5 days/week for 49 weeks/year.
		In a study of 1348 retirees from the asbestos industry, the respiratory cancer rate of men exposed only to chrysotile was 2.3 times the expected, whereas this rate was 5.3 times the expected for men who had been exposed to a combination of chrysotile and crocidolite (Enterline and Henderson 1973).
		Dusts of chrysotile, crocidolite, and amosite were prepared by ball-milling, a process noted for destroying much of the fibrous character of asbestos.
	risk.lsd.ornl.gov /tox/profiles/asbestos.shtml (8038 words)

	Amosite: Amosite mineral information and data. (Site not responding. Last check: 2007-11-01)
		Amosite asbestos has been banned in the UK and many other countries as the fibres and dust can cause serious lung conditions if inhaled.
		Any handling of material containing amosite asbestos should be done only by those who are trained and properly equipped in its handling and disposal.
		Collectors who have small samples of Amosite or other asbestos minerals are advised to keep them in sealed plastic boxes where there are, of course, perfectly safe.
	www.mindat.org /min-8738.html (150 words)

	Asbestos (Site not responding. Last check: 2007-11-01)
		Amosite is a brown, gray, or greenish color; chrysotile is white, gray, green, or yellowish; crocidolite is lavender, blue, or green; tremolite is white to light green; actinolite’s color is not known; and anthophyllite is gray, white, brown-gray, or green.
		Amosite, crocidolite and anthophyllite are fairly resistant to acids.
		NIOSH considers asbestos (i.e., actinolite, amosite, anthophyllite, chrysotile, crocidolite, and tremolite) to be a potential occupational carcinogen and recommends that exposures be reduced to the lowest possible concentration.
	www.nsc.org /ehc/chemical/asbestos.htm (1419 words)

	Types of Asbestos - Amphibole Asbestos, Serpentine Asbestos
		Asbestos is a group of six naturally occurring fibrous metamorphic minerals; chrysotile, amosite, crocidolite, tremolite, actinolite and anthophyllite.
		Of the hydrous magnesium silicate variety, asbestos is chemically inert, does not conduct heat or electricity, is insoluble and is without odor.
		Amosite is used commercially for various purposes such as cement sheet and pipe insulation.
	www.phhlaw.com /PracticeAreas/PracticeAreaDescriptions112.asp (300 words)

	eMedicine - Asbestos-Related Disease : Article Excerpt by: Ali Nawaz Khan, MBBS, FRCP, FRCR
		Amphibole fibers, which are characteristically straight, rigid, and needlelike, can be subdivided into commercial amphiboles (crocidolite, blue asbestos, and amosite, or brown asbestos) and noncommercial amphiboles (actinolite, anthophyllite, and tremolite).
		Chrysotile is mined in Canada, and tremolite and anthophyllite are mined in Finland and North America.
		Crocidolite and amosite are mined in South Africa and Australia.
	www.emedicine.com /radio/byname/asbestos-related-disease.htm (617 words)

	IngentaConnect PATHOGENICITY OF A SPECIAL-PURPOSE GLASS MICROFIBER (E GLASS) REL... (Site not responding. Last check: 2007-11-01)
		Results are compared with another microfiber of similar dissolution rate (k dis), code 100/475, and the more durable amosite asbestos, both of which we had previously used in similar experiments (Davis et al., 1996).
		At the end of 12 mo of exposure, the mean number of 104E fibers of all lengths in the lungs was approximately double that for amosite but two-thirds of that for 100/475.
		Amosite and 100/475 fibers longer than 15 µm were more persistent in the lungs than 104E fibers.
	www.ingentaconnect.com /content/tandf/uiht/2000/00000012/00000010/art00003 (564 words)

	SV40-Dependent AKT Activity Drives Mesothelial Cell Transformation after Asbestos Exposure -- Cacciotti et al. 65 (12): ...
		B, dose-response cytotoxicity curve of HMC exposed to amosite or crocidolite.
		E, 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide assay on cells exposed to amosite fibers in the presence or absence of Wortmannin or PD98059.
		D, 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide assay on cells derived from foci, exposed to amosite fibers or treated with VP-16, in the presence or absence of Wortmannin.
	cancerres.aacrjournals.org /cgi/content/full/65/12/5256 (4059 words)

	Working with Asbestos Pipe Insultaion Materials - Early, Ludwick, Sweeney & Strauss (Site not responding. Last check: 2007-11-01)
		OBJECTIVES: To examine the causes of death among 1130 former workers of a plant in Tyler, Texas dedicated to the manufacture of asbestos pipe insulation materials.
		CONCLUSIONS: The importance of the cohort lies with the pure amosite exposure which took place in the plant and the extended period of latency which has followed.
		The death certificate analysis indicates the pathogenicity of amosite, the predominant commercial amphibole used in the United States.
	www.elslaw.com /pubmed_Mar1998.htm (386 words)

	Community health risk assessment after a fire with asbestos containing fallout -- Bridgman 55 (12): 921 -- Journal of ...
		Amosite was only detected in a few samples and in trace amounts.
		In a cohort of amosite workers mesothelioma accounted for 2% of 857 deaths.
		The PMR for an occupational group is the ratio of the actual number of deaths to the expected number, multiplied by 100.
	jech.bmjjournals.com /cgi/content/full/55/12/921 (4085 words)

	MFA - CAMEO - Material Description
		A coarse brown, fibrous mineral composed of magnesium iron silicate.
		Amosite is a minor commercial form of asbestos.
		Amosite fibers are long and strong but brittle.
	www.mfa.org /_cameo/frontend/material_description.asp?name=amosite&language=1 (93 words)

	Brown asbestos, amosite, claim for compensation, risk-free, cost-free
		Amosite is actually an acronym for Asbestos Mines of South Africa, and was discovered in Transval, South Africa.
		The long arches of amosite fibres break into smaller groups that result in sharp needle like fibres.
		The ends of the fibres are flat and do not have frayed or split ends, a characteristic that helps distinguish it from white asbestos.
	www.accident-compensation-people-uk.co.uk /Amosite.htm (210 words)

	The White Lung Association
		During these 3 years, amosite was selectively used to a limited extent because of U.S. Naval specifications, and accounted for approximately 5% of the total asbestos used per year.
		Exposures to these other two types may have played some role in the etiology of disease; however, due to the overwhelming exposure of the cohort to chrysotile, it is likely that the other exposures played a minor role in the overall mortality patterns.
		These workers were exposed largely to chrysotile, with some crocidolite and amosite Among this group, 601 persons were identified as deceased by the Social Security Administration.
	www.whitelung.org /pubs/workexp/human.html (3169 words)

	[No title]
		At its tenth session, held in Geneva on 17 to 21 November 2003 the Intergovernmental Negotiating Committee adopted the decision guidance document for crocidolite, actinolite, amosite, anthophyllite and tremolite asbestos with the effect that these chemicals became subject to the interim PIC procedure.
		The four remaining amphibole forms of asbestos (actinolite, amosite, anthophyllite and tremolite) are grouped into a second chapter.
		Production, importation, distribution, sale and use of actinolite, amosite, anthophyllite, tremolite and any other type of asbestos, or mixture thereof, for any item, component or product that does not constitute a construction material is prohibited, with certain specific exceptions.
	www.pic.int /en/DGDs/AsbestosEN.doc (6150 words)

	[No title]
		There are many varieties of asbestos: the three most common are chrysotile, amosite, and crocidolite.
		Amosite and crocidolite fibers are like tiny needles.
		Amosite asbestos also comes from Africa and was first mined in 1916.
	yosemite.epa.gov /r5/r5ard.nsf/0/9cecdf4b746cb42c86256fc7006c54a9?OpenDocument (3394 words)

	Using in Vitro Iron Deposition on Asbestos To Model Asbestos Bodies Formed in Human Lung
		Recent studies have shown that iron is an important factor in the chemical activity of asbestos and may play a key role in its biological effects.
		The most carcinogenic forms of asbestos, crocidolite and amosite, contain up to 27% iron by weight as part of their crystal structure.
		Reported here is a method for depositing iron on asbestos fibers in vitro which produced iron deposits of the same form as observed on asbestos bodies removed from human lungs.
	pubs.acs.org /cgi-bin/abstract.cgi/crtoec/2000/13/i09/abs/tx000025b.html (420 words)

	AMOSITE - amosite.
		Hi, the estate real spanish is much more amosite rigorous than this unsuccessful bb gun.
		Phoenix, this terrier is far more amosite minute than a impious floor wood.
		Long Beach, one France is less AMOSITE deep than a jocose car hire in ireland.
	amosite.comicsline.com (228 words)

	Asbestos (IARC Summary & Evaluation, Supplement7, 1987)
		Exposure predominantly to amosite, but also to chrysotile, was reported to be the probable cause of at least four of five mesotheliomas (one peritoneal) observed in a UK insulation-board factory [ref: 95].
		One cohort with exposure to cummingtonite-grunerite, which is closely related to amosite, had no clear excess of lung cancer, although one case of mesothelioma was observed [ref: 96].
		Exposure to tremolite and actinolite has been the subject of a few studies in investigations of vermiculite mining and milling [ref: 97,98] and environmental exposure [ref: 99].
	www.inchem.org /documents/iarc/suppl7/asbestos.html (4341 words)

	How to Recycle Asbestos Containing Materials
		The asbestos covered pipe and the boiler lashing are primarily amosite asbestos admixed with large concentrations of magnesium hydroxide carbonate (hydromagnesite).
		X-ray diffraction of the amosite asbestos were broad instead of sharp indicating that the crystalline structure of this phase had been partially destroyed, e.g.
		Since amosite asbestos has a density of 2.85 g/cc and the measured waste glass has a density of 2.37g/cc, the relative volumes of waste and product can be calculated as 140 cc of ACM and 17.7 cc of glass.
	sti.srs.gov /fulltext/ms2000194/ms2000194.html (3094 words)

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