In the 1960s and 1970s, well designed case-referent studies put beyond doubt that exposure to airborne asbestos fibres was a cause of malignant mesothelioma. Some 35 cohort mortality studies in a large variety of industries during the 20-year period, 1974-1994, showed a wide range of outcomes, but in general that the risk was higher in exposures which included amphiboles rather than chrysotile ...

© 2001 Canadian Medical Association or its licensors In this issue (page 489), Joseph LaDou and colleagues on behalf of the Collegium Ramazzini call for an immediate and total ban on “asbestos” products because the current health risks associated with the use of “asbestos” are not acceptable, “controlled use” is not possible and “safer” substitutes are readily available. The logic is indisputab...

© 2001 Canadian Medical Association or its licensors In this issue (page 489), Joseph LaDou and colleagues on behalf of the Collegium Ramazzini call for an immediate and total ban on “asbestos” products because the current health risks associated with the use of “asbestos” are not acceptable, “controlled use” is not possible and “safer” substitutes are readily available. The logic is indisputab...

Glasses containing various amounts of aluminum and fluorin were crystallized by the heat treatment. Bending strengths of the crystallized glasses were measured, the crystalline phases were identified by X-ray diffraction method, and the microstructures were examined by electrommicroscopy. The relation between the microstructure and the bending strength was studied. The results obtained are summ...

The Posada Valley amphibolites in the inner zone of Variscan Sardinia are characterized by garnet porphyroblasts containing epidote, titanite, quartz, clinopyroxene, amphibole, and plagioclase concentrated core. matrix is made up amphibole fine-grained clinopyroxene plagioclase. recorded an HP stage, a metamorphic re-equilibration, third stage under greenschist facies. P–T conditions I (530–650...

Processes for formation, cooling, and altering Earth's ocean crust are not yet completely understood due to challenges in access sampling. Here, we use contiguous micro-imaging infrared spectroscopy develop complete-core maps of mineral occurrence investigate spatial patterns the hydrothermal alteration 1.2 km oceanic recovered from Oman Drilling Project Holes GT1A, GT2A, GT3A drilled Samail Op...