Mechanical model testing of rebreathing potential in infant bedding materials

Mechanical model testing of rebreathing potential in infant bedding materials.

Rebreathing of expired air may be a lethal hazard for prone sleeping infants. This paper describes a mechanical model to simulate infant breathing, and examines the effects of bedding on exhaled air retention. Under simulated rebreathing conditions, the model allows the monitoring of raised carbon dioxide (CO2) inside an artificial lung-trachea system. Resulting levels of CO2 (although probably...

Rebreathing expired gases from bedding: a cause of cot death?

The reported association of cot death and sleeping prone could be due to rebreathing of expired gases. A mechanical model simulating the respiratory system of an infant, exhaling warm humidified air with an end tidal carbon dioxide of 5%, has been used to investigate this. Some commonly used bedding materials caused an accumulation of carbon dioxide of 7% to over 10% with the model lying face d...

Mechanical Testing of Engineering Materials

Roughness Model for Adhesion Testing of Pharmaceutical Coating Materials

Objective Roughness is the main parameter in interlocking bonding mechanism. Yet there is no model designed to evaluate the effect of surface roughness on adhesion of coating materials in pharmaceutical sciences. Materials and Methods In this study polymethyl metacrylate spherical beads with different sizes were poured into 10 mm mold, then it was pressed by hand screw and finally heated to 141...

Fungi in used bedding materials.

Few workers have been concernied with the occurrence of bacteria and fungi withini used beddinig, bedding materials, anid upholstered furniture. Such organisms may be present in the raw materials, added during normal use and storage, multiply under certaiin conditions of humidity, and may be transferred to new felt when new and used materials are garnetted. Conant et al. (1935) studied the mold...