A comparison of whole-plant and individual-leaf gas exchange measurements was undertaken among azaleas, Rhododendron spp., treated with insecticides used to control the azalea lace bug, Stephanitis pyrioides (Scott). Azaleas in individual-leaf trials received 3 insecticide treatments during three 21-day trials. The whole-plant study included 2 insecticide treatments and was conducted during a 2...

Inferences from O2 uptake with respect to intramuscular [PCr] kinetics during moderate exercise in humans. J Physiol 518: 921–932, 1999. 20. Rossiter HB, Ward SA, Kowalchuk JM, Howe FA, Griffiths JR, Whipp BJ. Dynamic asymmetry of phosphocreatine concentration and O2 uptake between the onand off-transients of moderateand high-intensity exercise in humans. J Physiol 541: 991–1002, 2002. 21. Siet...

Inferences from O2 uptake with respect to intramuscular [PCr] kinetics during moderate exercise in humans. J Physiol 518: 921–932, 1999. 20. Rossiter HB, Ward SA, Kowalchuk JM, Howe FA, Griffiths JR, Whipp BJ. Dynamic asymmetry of phosphocreatine concentration and O2 uptake between the onand off-transients of moderateand high-intensity exercise in humans. J Physiol 541: 991–1002, 2002. 21. Siet...

BACKGROUND High-intensity noninvasive ventilation (HI-NIV) is the most effective means of improving several physiological and clinical parameters in subjects with chronic hypercapnic COPD. Whether the newer hybrid mode using target tidal volume noninvasive ventilation (target V(T) NIV) provides additional benefits remains unclear. METHODS Subjects with COPD successfully established on long-te...

INTRODUCTION Alveolar dead space reflects phenomena that render arterial partial pressure of carbon dioxide higher than that of mixed alveolar gas, disturbing carbon dioxide exchange. Right-to-left shunt fraction (Qs/Qt) leads to an alveolar dead space fraction (VdAS/VtA; where VtA is alveolar tidal volume). In acute respiratory distress syndrome, ancillary physiological disturbances may includ...

Since around 1950, physiological dead space - the difference between arterial and mixed expired pCO2 (partial pressure of carbon dioxide) divided by the arterial pCO2 - has been a useful clinical parameter of pulmonary gas exchange. In the previous issue of Critical Care, Niklason and colleagues remind us that physiological dead space, while easily measured, consolidates potentially very comple...

background : the present study was undertaken to ascertain whether (or not) long term occupational exposure to low (sub-tlv levels) atmospheric concentrations of chlorine gas was associated with any significant decrements in the parameters of pulmonary function and/or  increased prevalence of respiratory symptoms. methods : in this retrospective cohort study that was performed in 2012, 54 worke...