Mechanisms of particulate matter toxicity in neonatal and young adult rat lungs.

Particulate matter (PM*) has been associated with a variety of adverse health effects, primarily involving the cardiovascular and respiratory systems. Researchers continue to investigate biologic mechanisms that may explain how exposure to PM exacerbates or directly causes adverse effects. Particle composition may play a critical role in these effects.

Airway geometry models of children's lungs for use in dosimetry modeling.

Single-path whole-lung and lobar models of the lungs of 11 children between 3 mo and 21 yr of age were developed based on a combination of cast data and published information on distal airway dimensions. The cast data used to generate these models were taken from one of the largest databases of actual measurements in children. The methods used to develop the children's models were based on techniques that have been used to develop adult single-path airway geometry models.

Developing a traditional chinese medicine diagnostic structure for post-traumatic stress disorder.

Background: Post-traumatic stress disorder (PTSD) is a common, disabling condition with many diverse symptoms including anxiety, depression, insomnia, and body pain. These symptoms are likely to be helped by treatment with Traditional Chinese Medicine (TCM); however, PTSD is not yet a recognized disorder (bing ming) in Chinese medicine. In preparation for a phase II clinical trial comparing TCM and cognitive behavioral therapy (CBT) treatment of PTSD symptoms, a TCM diagnostic pattern framework for persons who meet the American Psychiatric Association Diagnostic and Statistical Manual of Mental Disorders, Fourth Edition (DSM-IV) definition of PTSD was sought.

Particle size and composition related to adverse health effects in aged, sensitive rats.

Small increases in concentrations of ambient particulate matter (PM*) have been linked to adverse health effects, especially in older people and people with preexisting respiratory disease. Some epidemiologic studies have shown the association to be stronger with PM less than 2.5 microm in aerodynamic diameter (PM2.

Fractal geometry of airway remodeling in human asthma.

Rationale: Airway wall remodeling is an important aspect of asthma. It has proven difficult to assess quantitatively as it involves changes in several components of the airway wall.

Objective: To develop a simple method for quantifying the overall severity of airway wall remodeling in asthmatic airways using fractal geometry.