Air Trapping: A Cause of Heterogeneous Attenuation

Air Trapping: A Cause of Heterogeneous Attenuation

Purpose: To investigate important factors affecting the frequency of air trapping through observation of normal lung attenuation, and propose a cause of heterogeneous attenuation. Materials and Methods: In this ethical committee-approved study, a total of 109 patients (30 males, 79 females; mean age, 58.2 years; range, 27 81 years) were included. All patients had undergone inspiratory and expir...

Excessive Attenuation of Measles Virus as a Possible Cause of Failure in Measles Immunization

Unilateral air trapping.

Optical Trapping of Gold Nanoparticles in Air.

Most progress on optical nanoparticle control has been in liquids, while optical control in air has proven more challenging. By utilizing an air chamber designed to have a minimum of turbulence and a single laser beam with a minimum of aberration, we trapped individual 200 to 80 nm gold nanoparticles in air and quantified the corresponding trapping strengths. These results pave the way for cons...

Ambient air pollution: a cause of COPD?

The role of ambient air pollution in the development of chronic obstructive pulmonary disease (COPD) is considered to be uncertain. We review the evidence in the light of recent studies. Eight morbidity and six mortality studies were identified. These were heterogeneous in design, characterisation of exposure to air pollution and methods of outcome definition. Six morbidity studies with objecti...