Photosynthesis and respiration II. Effect of 3-(3,4-dichlorophenyl)-1,1-dimethylurea and of partial pressure of oxygen on the rates of carbon dioxide exchange in light and in darkness of detached wheat leaves

1968 ◽  
Vol 24 (4) ◽  
pp. 344-345 ◽  
Author(s):  
J. Poskuta
Keyword(s):  
Carbon Dioxide ◽  
Partial Pressure ◽  
Carbon Dioxide Exchange ◽  
Partial Pressure Of Oxygen ◽  
Wheat Leaves ◽  
Photosynthesis And Respiration

scholarly journals Massive Subcutaneous Emphysema during Laparoscopic Cholecystectomy

1970 ◽  
Vol 21 (1) ◽  
pp. 77-79
Author(s):  
ASM Moosa ◽  
M Baharul Islam ◽  
Shahina Akther ◽  
M Latifur Rahman ◽  
Nazim Uddin Ahmed
Keyword(s):  
Carbon Dioxide ◽  
Laparoscopic Cholecystectomy ◽  
Partial Pressure ◽  
Subcutaneous Emphysema ◽  
Airway Pressure ◽  
Surgical Techniques ◽  
Lung Ventilation ◽  
Peak Airway Pressure ◽  
Sudden Increase ◽  
Partial Pressure Of Oxygen

Laparoscopic surgical techniques are increasingly being applied to treat cholelithiasis and other indications of gallbladder diseases. These procedures however are not without potential morbidity. Herein we describe two patients treated with laparoscopic cholecystectomy; those cases were complicated with subcutaneous emphysema and hypercarbia per-operatively. After discontinuation of pneumoperitoneum, saturation of partial pressure of oxygen (SpO2) gradually increased with improvement of the neck subcutaneous emphysema, at the same time the lung ventilation also improved. Our findings show that we have to stop pneumoperitoneum or decrease partial pressure of end carbon dioxide level immediately, when we find a sudden increase of the peak airway pressure or decrease SpO2 with subcutaneous emphysema during laparoscopic cholecystectomy.   doi: 10.3329/taj.v21i1.3225 TAJ 2008; 21(1): 77-79

RESPONSE OF ANTIDIURETIC HORMONE TO ACUTE EXPOSURE TO MILD AND SEVERE HYPOXIA IN MAN

1978 ◽  
Vol 77 (2) ◽  
pp. 157-160 ◽  
Author(s):  
J. R. CLAYBAUGH ◽  
J. E. HANSEN ◽  
D. B. WOZNIAK
Keyword(s):  
Carbon Dioxide ◽  
Partial Pressure ◽  
Antidiuretic Hormone ◽  
Plasma Osmolality ◽  
Gas Mixtures ◽  
Renin Activity ◽  
Severe Hypoxia ◽  
Partial Pressure Of Oxygen ◽  
Nitrogen Gas ◽  
Mild Hypoxia

SUMMARY Eight men, 19-35 years of age, breathed 20·9% (normal oxygen), 13·9% (mild hypoxia) or 11·1% (severe hypoxia) oxygen in nitrogen gas mixtures during three 20 min periods, which were separated by 1 h recovery periods. The order in which the gas mixtures were breathed was random. The partial pressure of oxygen decreased from a mean of 93·5 during exposure to normal oxygen to 53·9 and 36·7 mmHg during mild and severe hypoxia respectively. There were corresponding decreases in haemoglobin saturation. The partial pressure of carbon dioxide was lower and the pH higher during severe hypoxia than during exposure to normal oxygen. There were no changes in the plasma osmolality or in the concentrations of sodium or potassium in the plasma. There was a tendency for both the renin activity and the concentration of aldosterone in the plasma to decrease progressively as the percentage of oxygen breathed decreased. Unlike severe hypoxia, mild hypoxia suppressed the concentration of antidiuretic hormone (ADH) in the plasma of all subjects by about 59%; during severe hypoxia the reduction was not significant, being only about 33%. These data are consistent with the suggestion that the effect of hypoxia on the release of ADH is dependent on the level of hypoxia.

scholarly journals CARBON DIOXIDE EXCHANGE OF A WHEAT STAND GROWN IN NASA'S BIOMASS PRODUCTION CHAMBER

HortScience ◽  
1990 ◽  
Vol 25 (9) ◽  
pp. 1151d-1151
Author(s):  
K.A. Corey ◽  
R.M. Wheeler ◽  
J.C. Sager ◽  
R.P. Prince
Keyword(s):  
Carbon Dioxide ◽  
Triticum Aestivum ◽  
Biomass Production ◽  
Mass Flow ◽  
Compensation Point ◽  
Carbon Dioxide Exchange ◽  
Film Culture ◽  
Short Term ◽  
Photosynthesis And Respiration

A wheat (Triticum aestivum cv. Yecora Rojo) stand was grown using nutrient film culture in the closed conditions of NASA's Biomass Production Chamber. Rates of photosynthesis and respiration of the entire stand (about 20 m2) were determined daily using a regime of 20 hr light/4 hr dark, 20 C light/16 C dark an average PPF of 600 μmol/m2/s from HPS lamps, and a CO2 cone of 1000 ppm. Fractional interception of PPF by the stand reached a maximum of 0.96 at 24 days from planting. Rates of photosynthesis were constant throughout the photoperiod as determined by short term drawdowns of CO2 throughout the photoperiod. Drawdown rates of CO2 were correlated with rates determined by logging of mass flow of CO2 injected during chamber closure. Photosynthetic drawdowns of CO2 indicated that photosynthesis was not saturated at 1000 ppm CO2 and that the CO2 compensation point was about 50 ppm. Whole stand light compensation points were 200 to 250 μmol/m2/s between days 13 and 70 and then increased rapidly during senescence.

RESPIRATION OF FISHES WITH SPECIAL EMPHASIS ON STANDARD OXYGEN CONSUMPTION: IV. INFLUENCE OF CARBON DIOXIDE AND OXYGEN

1964 ◽  
Vol 42 (5) ◽  
pp. 847-856 ◽  
Author(s):  
F. W. H. Beamish
Keyword(s):  
Carbon Dioxide ◽  
Oxygen Consumption ◽  
Partial Pressure ◽  
Brook Trout ◽  
Salvelinus Fontinalis ◽  
Partial Pressure Of Oxygen ◽  
Partial Pressures ◽  
Rate Of Oxygen Consumption ◽  
Standard Rate ◽  
Different Levels

Oxygen consumption was determined in relation to spontaneous activity and standard metabolism estimated by extrapolating the values to zero activity, Standard oxygen consumption was determined in relation to different partial pressures of carbon dioxide and oxygen for brook trout. Salvelinus fontinalis (Mitchill), at 10 °C, and carp, Cyprinus carpio Linnaeus, at 25 °C. In general, at each partial pressure of oxygen applied, standard oxygen consumption did not change significantly over the range of partial pressures of carbon dioxide followed. The relation for brook trout operated on a level characteristic of the partial pressure of oxygen. Although the effect of different levels of oxygen was not established for carp at 25 °C, it is presumed that the relation operated also in that species in a similar way.Acclimation to the different levels of carbon dioxide and oxygen to be tested was examined and, ordinarily, found not to change significantly the standard rate of oxygen consumption.

scholarly journals Liver tissue partial pressure of oxygen and carbon dioxide during partial hepatectomy

2004 ◽  
Vol 92 (5) ◽  
pp. 735-737 ◽  
Author(s):  
A.J. Brooks ◽  
J Eastwood ◽  
I.J. Beckingham ◽  
K.J. Girling
Keyword(s):  
Carbon Dioxide ◽  
Partial Pressure ◽  
Partial Hepatectomy ◽  
Liver Tissue ◽  
Partial Pressure Of Oxygen
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