respiratory mechanics and gas exchange

... stability and PaO2 and PaCO2 for gas exchange Secondary study end points were systolic and mean arterial pressures, end-tidal partial pressure of CO2(PCO2), flow through the ILA system and return ... significant effect on gas exchange (PaO2 and arterial partial pressure of CO2(PaCO2)) and a harmful effect on circulation (coronary perfusion pressure (CPP), systolic arterial pressure and mean arterial ... exert its beneficial effects on gas exchange or it may be harmful because of the arteriovenous shunt it causes We have tested the effects of CPR on circulation and gas exchange with or without an...

Ngày tải lên: 13/08/2014, 15:21

... differed between seedlings and adults and to analyse the relationships between leaf traits and gas exchange at the two stages Strong relationships between leaf N content and gas exchange rates have ... the months of July and August, and summer drought occurs every year 2.2 Gas- exchange measurements Gas- exchange measurements were carried out in the field, during late spring and early summer (before ... leaf N contents and gas exchange rates [25, 27] However, the relationships between N content and photosynthesis can be affected by compromises between maximising carbon gain and water conservation...

Ngày tải lên: 08/08/2014, 01:21

... Treatment means, pooled for the whole summer, of net C0 exchange (CER) and needle conductance (Gn) of the clones are shown in Fig a, b C0 exchange rate was reduced for all clones at pH 4.0+ as ... simulated (acidic) pre- cipitation treatment Acknowledgments Discussion and Conclusion The reduction of CER and Gn at pH 4.0 + and the significant pH x ions interaction suggest a synergism between ... & Impens (1986) Direct effects of simulated acid wet deposition on gas exchange of Norway spruce In: Direct Effects of Dry and Wet Deposition on Forest Ecosystems - in Particular Canopy Interactions...

Ngày tải lên: 09/08/2014, 04:20

... in the H and LH treatments than in other treatments The Ci /Ca ratio ranged from 0.63 (LH and H treatment for the 1- and 2YS) to 0.74 and 0.76 (V and C for the 1- and 2YS respectively) and was ... removed and cool stored The eight probes from the same treatment were combined and analysed in groups of four, which resulted in two values per experimental treatment 2.6 Leaf gas exchange and leaf ... diameter and 171 cm height and those from 1YS, 9.2 mm of diameter and 129 cm height Diameter was measured using a digital calliper at a permanently marked point at breast height (2YS) and at 50...

Ngày tải lên: 07/08/2014, 16:20

... the end of the study Gas- exchange and fluorescence measurements were carried out over two years on four leaves at similar ontogenic stage (young and fully expanded) of four randomly selected plants ... infection than undisturbed plants, and if so, whether this would be reflected in gas- exchange and chlorophyll fluorescence measurements During the summer, when soil and atmospheric water deficits ... springs and autumns and hot dry summers, with a mean annual temperature of 13–14 ºC and an annual precipitation of 500–700 mm Plants were irrigated daily with 1.33 L water during autumn and winter and...

Ngày tải lên: 08/08/2014, 14:21

... DOY 190, and in the afternoon (1500 hours solar time) on the needles used for gas- exchange measurements, the needles were cut and respectively After rapidly frozen in liquid nitrogen and stored ... (about days) and it took about week for A and plant transpiration rate to recover the pre-stress values (figures and 2) gesting In contrast to our results obtained on needles, Nguyen and Lamant ... in drought stressed Q alba, Q macrocarpa and Q stellata seedlings, Can J For Res 18 (1988) 1-5 [12] Picon C., Guehl J.M., Ferhi A., Leaf gas- exchange and isotope composition responses to drought...

Ngày tải lên: 08/08/2014, 14:21

... no effect on gas exchange, phenolics and TNC of live oak seedlings; and that interactions of CO with soil resource limitations (N) would have no effect on these variables Materials and methods ... avoid positional effects one 2.2 Gas exchange Measurements of stomatal conductance (g and C ) s exchange rate (CER) were made at the growth [CO ] with a portable gas- analysis system (LI-6200, Li-cor ... temperature, RH and PPFD in the leaf cuvette were kept at growth conditions exchange of six different were selected for harfor growth measurements, at the start of CO and nutrient treatments and continued...

Ngày tải lên: 08/08/2014, 14:21

... young stands even though stand total leaf area remains high [1] A three- dimensional gas exchange model (STANDFLUX; cf [18]), which includes sub-models for light interception and for gas exchange ... stages and with intermediate forest structures, as shown for instance by Buchmann et al [13] Based on measurements of needle gas exchange [17] and gas exchange of branches without needles and trunks ... accuracy of ± 20% DISCUSSION AND CONCLUSIONS Gas exchange rates of the six Norway spruce canopies were described with the three dimensional gas exchange model STANDFLUX with one species-specific...

Ngày tải lên: 08/08/2014, 14:22

... examined the effects of CO enhancement i) on leaf gas exchange under well-watered conditions and moderate drought and ii) on biomass production and predict the impact of increasing CO upon natural ... plant physiology and growth (Field et al, 1992; Mousseau and Saugier, 1992) Generally, total growth of a plant is increased by elevated CO (Eamus and Jarvis, 1989), but leaf gas exchange appear ... harvested and divided into roots, stems and leaves Expanding leaves, secondary roots and stems were segmented Biomass of each part, length of the main root and stem, and total leaf area were recorded...

Ngày tải lên: 08/08/2014, 18:21

... were folded and clamped closed at the bottom end A sandy loam was used to backfill between the root plugs and the membrane to ensure the continuity of water films between the root plug and the membrane ... concentrations of 0, 40, and 80 g PEG/kg H and were used to fill 45-I basins O The concentrations correspond to water potentials of about 0, -0.04 and -0.12 MPa (Williams and Shaykewich, 1969) Four ... evaporative demand (E20: 20°C, 60% RH) or a high evaporative demand (E30: 30°C, 40% RH) The corresponding absolute humidity deficits in the cham-3 bers were 6.9 and 18.2 g m for E20 and E30, respectively...

Ngày tải lên: 08/08/2014, 19:21

... δ=R where s R and b R [1] refer to 13 ratio in the C 12 C/ Dee Belemnite standard sample and in the Pee (PDB), respectively RESULTS Microclimate, growth and gas exchange Gas exchange measurements ... were shaded all day long p I Water status and gas exchange measurements Water status and gas exchange measurements made periodically between July 11 and August 16 These measurements were carried ... transition between the shaded and the full sunlight exposed regions Gas exchange measurements were performed between 11.30 and 13.30 (UT) on leaves per tree Gas exchange parameters were calculated...

Ngày tải lên: 08/08/2014, 23:22

... photosynthesis and stomatal control of gas exchange in three coniferous species Physiol Plant 73, 97-104 Guehl JM, Aussenac G (1987) Photosynthesis decrease and stomatal control of gas exchange in ... LWC is the mean of replicates Gas exchange measurements Whole leaf gas exchange was measured in an open system designed in the laboratory Net COassimilation (A) and transpiration (E) rates were ... (Boyer, 1976) and in ribulose-biphosphate carboxylase-oxygenactivity (Vu et al, 1987) Leaf gas exchange measurements and analysis using diffusion models (Jones, 1973, 1985; Farquhar and Sharkey,...

Ngày tải lên: 09/08/2014, 03:24

... profile A portable system was used to measure gas exchange in the field (LCA-2 system) Gas exchange calculations are according to von Caemmerer and Farquhar (1981) Leaf water potential was measured ... to be slightly higher (data not shown) We have expressed gas exchange measurements on an area-base because light interception and gas exchange with the atmosphere are areabased phenomena (however, ... instantaneous water use efficiencies (WUE) between evergreen and deciduous trees The small differences between INUE as estimated by gas exchange and as estimated by the relative amount of carbon stable...

Ngày tải lên: 09/08/2014, 04:20

... needles is fairly low (Troeng and Linder, 1982) Enclosing them in a cuvette causes errors in A, E and g Soil temperature affected gas exchange pine seedlings In general A and E were higher in warm ... photosynthesis and water relations with age and season in Abies amabilis Gan :J For, Res 14,77-84 Troeng E & Under S (1982) Gas exchange in Change a 20-year-old Scots pine I Net photosynthesis of current and ... the first 11 d and then declined The shape of the curve is similar to that for transpiration Conclusions Initiation and development of current yr needles affected the results of gas exchange measurements...

Ngày tải lên: 09/08/2014, 04:20

... clarified With the multiple inert gas elimination technique, developed by Wagner et al [13] and modified for use in the standing horse [14], the pulmonary gas exchange and a virtually continuous distribution ... Sampling of blood and expired gas for measurements of gas concentrations by the multiple inert gas elimination technique (MIGET) were performed in the unsedated standing horse (Unsedated) and started ... for the mean and standard deviation of the blood flow log distribution (Qmean and log SDQ, respectively), shunt (perfusion of lung regions with VA/Q < 0.005), and the mean and standard deviation...

Ngày tải lên: 12/08/2014, 18:22

... be able to follow basic commands, and have a cough and gag reflex before extubation However, in patients intubated for respiratory failure, assessment of respiratory mechanics before extubation ... curves and effect of positive endexpiratory pressure on gas exchange in adult respiratory distress syndrome Crit Care Med 1983, 11:591-597 24 Pedley TJ, Kamm RD: Dynamics of gas flow and pressure ... medicine and in intensive care units Measure- ments are readily available at the bedside and can be used to assist with diagnosis and treatment of various illnesses Measurement of respiratory mechanics...

Ngày tải lên: 12/08/2014, 22:21

... with gas exchange and respiratory mechanics parameters before and after a recruitment maneuver Parameters correlating with aerated lung No significant correlations were found between the gas exchange ... 1c) and also between VPOOR and respiratory system compliance (r = 0.719, p = 0.006) (Fig 1a) and the inflation pressure maximum compliance increase (r = 0.655, p = 0.008) Effects on gas exchange ... maneuver (43 ± 26 ml, p = 0.114) The fractional change (VGAS), however, was not correlated with any parameter of gas exchange or respiratory mechanics; it only correlated with fractional change (VNORM),...

Ngày tải lên: 12/08/2014, 22:22

... Printed and bound in Great Britain v Contents Preface vii Introduction ix Theory and general principles Gas- diesel and dual-fuel engines Exhaust emissions and control Fuels and lubes: chemistry and ... propulsion and gas turbines Both modes found favour in warships, however, and aero-derived gas turbines have recently secured firm niches in fast ferry and cruise tonnage A stronger challenge from gas ... circle diameters of the input and output gears are respectively = 14 POUNDER’S MARINE DIESEL ENGINES AND GAS TURBINES d1 and d and the speeds of the two shafts are n1 and n2, the circumferential...

Ngày tải lên: 13/02/2014, 16:20

... Atkins Acute Respiratory Failure, edited byWM Zapol and K J Falke Gas Mixing and Distribution in the Lung, edited by L A Engel and M Paiva 26 High-Frequency Ventilation in Intensive Care and During ... edited by C J Sanderson 126 Pediatnc Asthma edited by S Murphy and H W Kelly 127 Viral Infections of the Respiratory Tract, edited by R Dolin and P F Wright 128 Air Pollutants and the Respiratory ... C L Marcus 148 Pulmonary and Peripheral Gas Exchange in Health and Disease, edited by J Roca, R Rodriguez-Roisen, and P D Wagner 149 Lung Surfactants: Basic Science and Clinical Applications,...

Ngày tải lên: 14/02/2014, 17:20

... concern (Wandwalo & Morkve 2000) Afghanistan has the highest TB burden in south Asia (World Health Organization 2007) While health services are expanding and quality improving, gaps in access and deficient ... Chicago, IL) using standard statistical tests for comparison of means and proportions Predictors of TB symptoms and diagnoses were analysed using chi-squared (dichotomous predictors) and univariate ... diagnosis and recognition of this and other respiratory conditions While annual risk of tuberculosis infection (ARTI) in Afghanistan is high, most patients with suggestive symptoms will not have TB, and...

Ngày tải lên: 15/02/2014, 13:20