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Study on Pathogenesis and Prevention of Pneumoconiosis Due to "Sendo" Dusts.

Authors
Ueda-A; Futatsuka-M; Nomura-S
Source
Proceedings of the VII International Congress of Rural Medicine, Salt Lake City, Utah, September 17-21, International Association of Agricultural Medicine 1978 Sep:81-83
Link
NIOSHTIC No.
00182618
Abstract
Pneumoconiosis due to exposure to sendo dust in Japanese workers engaged in the production of tatami woven mats was studied. Workers who cut, smear, dry, and store the rush during the reaping process in July were exposed to the sun and dense concentrated dusts of sendo dyeing soil. The process of smearing rushes into the sendo to keep the color in the mat is called dorozome. Over 100 milligrams/cubic meter of dust was measured during this process. Of the airborne dust particles, 78 percent were under 5 micrometers in diameter. The sendo contains quartz (14808607), clay and other minerals, with 20 to 30 percent free silica. In a health survey conducted among rush farmers, 44 cases of slight fibrosis was noted in 326 subjects, and 37 cases of suspected pneumoconiosis were identified. An experimental study was also made of fibrogenicity occurring in lung tissue of rats exposed to sendo dusts through intratracheal infusion of 3.5 percent and 10 percent suspensions. After 3 to 6 months following injection histological changes were noted in lung tissue which suggested that rush farmers' pneumoconiosis resulted from long term inhalation of sendo dusts. The authors suggest there is a real need for dust control procedures for these workers including legal steps and the substitution of other materials for the sendo.
Keywords
NIOSH-Grant; Airborne-particles; Airborne-dusts; Dust-inhalation; Laboratory-animals; Pulmonary-system-disorders; Agricultural-workers; Mineral-dusts; Silica-dusts;
Contact
Prev Med & Environmental Hlth University of Iowa Inst/agric Med & Environ Hlth Iowa Oakdale, Iowa 52319
CAS No.
14808-60-7;
Publication Date
19780917
Document Type
Conference/Symposia Proceedings;
Funding Amount
24225.00
Funding Type
Grant;
Fiscal Year
1978
NTIS Accession No.
NTIS Price
Identifying No.
Grant-Number-R13-OH-00694
Priority Area
Asthma and Chronic Obstructive Pulmonary Disease; Disease and Injury; Pulmonary-system-disorders;
Source Name
Proceedings of the VII International Congress of Rural Medicine, Salt Lake City, Utah, September 17-21, International Association of Agricultural Medicine
State
UT; IA;
Performing Organization
University of Iowa, Iowa City, Iowa
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