Fresh Water Studies. I. The Relative Temperature, Oxygen Content, Alkali Reserve, the Carbon Dioxide Tension and pH of the Waters of Certain Mountain Streams at Different Altitudes in the Smoky Mountain National Park

Ecology ◽  
1929 ◽  
Vol 10 (1) ◽  
pp. 97-111 ◽  
Author(s):  
Edwin B. Powers
Keyword(s):  
Carbon Dioxide ◽  
Fresh Water ◽  
Oxygen Content ◽  
National Park ◽  
Carbon Dioxide Tension ◽  
Mountain Streams ◽  
Relative Temperature ◽  
Different Altitudes

scholarly journals Venous Admixture Effect during One-lung Anaesthesia

1972 ◽  
Vol 1 (1) ◽  
pp. 45-53 ◽  
Author(s):  
T. A. Torda ◽  
H. D. O'Brien ◽  
C. McCulloch ◽  
K. Tsui
Keyword(s):  
Carbon Dioxide ◽  
Cardiac Output ◽  
Oxygen Saturation ◽  
Oxygen Content ◽  
Carbon Dioxide Tension ◽  
Venous Admixture ◽  
Content Difference ◽  
Venous Oxygen Content ◽  
The Mean

The venous admixture was measured before, during, and after deflation of one lung during anaesthesia for thoracotomy in 10 subjects ventilated with 50% oxygen. The mean oxygen saturation fell from 99% before deflation of the lung to 89% after 30 minutes’ atelectasis. The pH and carbon dioxide tension did not change significantly. The shunt was 38% of cardiac output five minutes after and 41% 30 minutes after deflation. The reciprocal of the arterial venous oxygen content difference correlated positively with the shunt, suggesting that increased venous admixture is accompanied by increased cardiac output.

scholarly journals The Control of Respiratory Movements in Crustacea by Oxygen and Carbon Dioxide

1934 ◽  
Vol 11 (1) ◽  
pp. 1-10
Author(s):  
H. MUNRO FOX ◽  
M. L. JOHNSON
Keyword(s):  
Carbon Dioxide ◽  
Oxygen Consumption ◽  
Fresh Water ◽  
Oxygen Tension ◽  
Sea Water ◽  
Respiratory Rhythm ◽  
Marine Species ◽  
Carbon Dioxide Tension ◽  
Respiratory Movements ◽  
Rate Of Movement

1. The respiratory movements of the barnacle Balanus and of the phyllopod Cheirocephalus are not accelerated either by decreased oxygen or by increased carbon dioxide tension in the water. 2. The rate of movement of the scaphognathite of the crayfish Astacus is accelerated by a fall in oxygen but not by a rise in carbon dioxide tension of the environment. 3. The rate of movement of the pleopods of the fresh-water isopod Asellus is accelerated by a fall in oxygen but not by a rise of carbon dioxide tension. 4. In the sea-shore isopod Ligia, submerged in sea water, the rate of pleopod movement is not accelerated by a decrease in oxygen tension below that in equilibrium with air, but a rise in oxygen tension above the latter value slows respiratory movements. Carbon dioxide has no accelerating effect. 5. Both a decrease in oxygen and an increase in carbon dioxide tension accelerate the respiratory pleopod movements of the amphipods Gammarus pulex and G. locusta. 6. Whereas in the fresh-water G. pulex the quickened respiratory rhythm is permanent at each decreased oxygen and increased carbon dioxide tension, in the marine G. locusta these changes in rate of beat are transitory. This is correlated with the greater oxygen consumption of the marine species.

Some cardiorespiratory parameters in anesthetized sheep

1961 ◽  
Vol 16 (1) ◽  
pp. 45-47 ◽  
Author(s):  
Denis F. J. Halmagyi ◽  
H. J. H. Colebatch
Keyword(s):  
Carbon Dioxide ◽  
Cardiac Output ◽  
Oxygen Content ◽  
Lung Compliance ◽  
Carbon Dioxide Tension ◽  
Venous Admixture ◽  
Mean Values ◽  
Arterial Blood ◽  
Pulmonary Arterial ◽  
Standard Deviations

Ventilated volumes, oxygen content and carbon dioxide tension in the arterial blood, cardiac output, venous admixture, systemic and pulmonary arterial pressures, and lung compliance were determined in 50 anesthetized sheep. Mean values and standard deviations are described and compared with values obtained in 11 unanesthetized sheep. Submitted on July 25, 1960

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