For many years there has been much argument whether workers in the dusty trades are prone to chronic bronchitis. In 1966 the Medical Research Council issued a report of a Select Committee which concluded that occupationally induced bronchitis did not play a significant part in the aetiology of airways obstruction in dust-exposed men. Since then epidemiological studies have demonstrated that the...

Previous models of dust growth in protoplanetary disks considered either uniformly laminar or turbulent disks. This Letter explores how dust growth occurs in a layered protoplanetary disk in which the magnetorotational instability generates turbulence only in the surface layers of a disk. Two cases are considered: a completely laminar dead zone and a dead zone in which turbulence is “stirred up...

We have analyzed a uniform sample of 16 evolved H II regions located in a 2◦×2◦ Galactic field centered at (l,b) = (30◦, 0◦) and observed as part of the Herschel Hi-GAL survey. The evolutionary stage of these H II regions was established using ancillary radio continuum data. By combining Hi-GAL PACS (70 μm, 160 μm) and SPIRE (250 μm, 350 μm and 500 μm) measurements with MIPSGAL 24 μm data, we b...

1) Using MODIS Terra Level 1B data containing calibrated and geolocated radiances, we investigated a regional signal of wind-blown mineral dust over the oceans. The goal of this study was to identify the thermal-IR radiative signature of atmospheric dust originating from the main world’s dust production regions and explore the implications to the dust detection over oceans with the techniques b...

This is the second of series on the impact of dust. It focuses on the physical, chemical and physiological effects of dust particles and aerosols. Plants of all types and classes (from algae to forest trees and everything in between) are adversely affected either directly through abrasion by airborne particles or through interference with plant physiology or indirectly through the impact on soi...