Dusts and lungs
نویسندگان
چکیده
منابع مشابه
The topographic distribution of mineral dusts in some pneumoconiotic lungs.
All theories that have served to explain the formation of fibrous tissue in silicosis relate the development of the collagen fibers, directly or by inference, to the site of the silica particles. Recent studies1’ 2 have established that portions of some silicotic nodules may contain no demonstrable mineral particles and that dust particles formerly believed to be more or less permanently impris...
متن کاملThe action of anthracite and bituminous coal dusts mixed with quartz on the lungs of rats.
Belt and King (1945) studied the tissue reactions produced in animals by selected dusts from South Wales coal mines, and found that clean coal (low ash coal fraction containing 99% coal) produced only minimal fibrosis (grade 1) with simple foreign body reaction in 250 to 500 days. In experiments with high ash coal fractions which contained from 37 to 66% coal and about 1 to 3% quartz, the rest ...
متن کاملAerosols – Dusts, Fumes and Mists
Instead of the definitions for total dust and fine dust which were used in the past, from 1996 the new internationally agreed conventions for measuring concentrations of particles (DIN EN 481, 1993) are to be used in the establishment of MAK values. Therefore the definitions of particle fractions and the methods of measuring them have been modified in line with this convention and also extended...
متن کاملHistamine in cereal dusts.
It is clear from this work that thorough controlled and supervised washing by the wet method will not remove more than 50% of the original contaminants in soiled engineers' overalls. Indeed these figures may be on the liberal side as these experiments concerned contamination by clean solid-free oils. In ordinary practice the contaminants will be more tenacious due to the presence of finely divi...
متن کاملBiopersistence of the mineral matter of coal mine dusts in silicotic human lungs: is there a preferential release of iron?
Toxic potency of quartz-containing dusts, including coal mine dusts, is usually inhibited by protective clay mineral layers on the surface of quartz particles. This investigation of 11 dusts recovered from lungs of coal miners with different silicosis grade shows that such layers persist during long-term contact with human lung tissues. On the other hand, the results suggest that an apparently ...
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ژورنال
عنوان ژورنال: Thorax
سال: 1993
ISSN: 0040-6376
DOI: 10.1136/thx.48.2.182