Gas exchange following experimental pulmonary thromboembolization was studied with an inert gas elimination technique in 17 dogs. Pulmonary arterial, systemic arterial, and expired gas concentrations of six gases infused intravenously were measured before embolization and 5, 10, 15, 30, 60, and 120 minutes after embolization. Distributions of ventilation-perfusion (VA/Q) ratios were derived fro...

Soil-atmosphere exchange of CH4, CO2, NOx, and N2O in the Colorado Shortgrass Steppe following five years of elevated CO2 and N fertilization A. R. Mosier, E. Pendall, and J. A. Morgan USDA/ARS, Fort Collins, CO, USA Department of Botany, University of Wyoming, Laramie, WY, USA Received: 28 January 2003 – Accepted: 18 April 2003 – Published: 20 May 2003 Correspondence to: A. R. Mosier (amosier@...

Respiration provides oxygen (O2) and removes carbon dioxide (CO2) for the body. An extraordinary anatomic arrangement of functional units (the alveoli) delimited by extra-thin walls (epithelium and endothelium) creates the interface for gas exchange between air and blood. Repetitive expansion and collapse of the chest wall facilitates movement of gas in and out of the lungs. This review focuses...

Bake, B. and Grimby, G. (1974). Thorax, 29, 366-370. Regional ventilation and gas exchange after hemicorporectomy. Maximum expiratory flow volume curves, gas exchange, closing volume, and regional distribution of lung volumes and ventilation were measured in a young man after hemicorporectomy. The patient breathed at low lung volume, close to residual volume, and his total lung capacity was 63%...

The placenta serves as the fetus' organ of gas exchange throughout intra-uterine life. While the dependence of fetal well-being on an intact maternal-placental unit has been recognized for centuries, it is only in the last several decades that research with fetal animals has begun to unravel the mechanisms by which it regulates blood supply and oxygen, as well as its role in the maternal-to-fet...

cies in the F1 population, viz. (1) carriers of a only, (2) carries of b only, (3) carriers of both a and b and (4) carriers of neither. If linkage exists, classes (3) and (4) will be in excess of classes (1) and (2). This method was used in rats in testing for linkage between the recessive lethal anemia' and an undescribed sublethal ("wobbly"), neither of which at the time was known to be link...

The requirement for sterility in plant tissue cultures avoidance of dehydration can impose sealing requirements that severely limit the rate of gas exchange in and out of the culture vessel. Conditions within the culture vessel such as the depth of any water cover, the presence of gelling agents, the bulk and porosity of the tissue and the temperature also strongly influence in vitro rates of g...

This paper describes a theoretical study to investigate the heat transfer characteristics of porous radiant burners. A one dimensional model is used to solve the governing equations for porous medium and gas flow before the premixed flame to the exhaust gas. Combustion in the porous medium is modeled as a spatially dependent heat generation zone. The homogeneous porous media, in addition to its...

In the present paper , dynamic characteristics of the pressure pulsation and heat exchange have been analyzed in cooler of reciprocating compressor. Through the analysis of energy balance for an heat exchange element , the differential equations are established for the heat exchange element. Effect of the pressure pulsation on heat exchange has been considered in the cooler of the compressor by...