Relative Importance of Hydrogen-Ion Concentration, Temperature, Dissolved Oxygen, and Carbon-Dioxide Tension, on Habitat Selection by Brook-Trout

Ecology ◽  
1930 ◽  
Vol 11 (2) ◽  
pp. 246-262 ◽  
Author(s):  
Charles W. Creaser
Keyword(s):  
Carbon Dioxide ◽  
Habitat Selection ◽  
Dissolved Oxygen ◽  
Brook Trout ◽  
Carbon Dioxide Tension ◽  
Hydrogen Ion ◽  
Ion Concentration ◽  
Relative Importance ◽  
Hydrogen Ion Concentration

scholarly journals CHANGES IN CARBON DIOXIDE TENSION AND HYDROGEN ION CONCENTRATION OF THE BLOOD FOLLOWING MULTIPLE PULMONARY EMBOLISM

1927 ◽  
Vol 45 (4) ◽  
pp. 633-641 ◽  
Author(s):  
Carl A. L. Binger ◽  
Richmond L. Moore
Keyword(s):  
Carbon Dioxide ◽  
Carbon Dioxide Tension ◽  
Hydrogen Ion ◽  
Ion Concentration ◽  
Hydrogen Ion Concentration ◽  
Characteristic Type ◽  
Pulmonary Capillaries ◽  
Partial Pressure Of Co2 ◽  
Shallow Breathing ◽  
Impaired Pulmonary Function

1. The production of multiple emboli of the pulmonary capillaries and arterioles results in rapid and shallow breathing which may be associated with anoxemia, but is not dependent for its occurrence upon anoxemia. 2. Similarly there may occur an increase in the partial pressure of CO2 in the blood as well as an increase in hydrogen ion concentration. 3. These changes must be regarded as the result of the impaired pulmonary function. 4. They are not, however, the cause of the rapid and shallow respirations, since the abnormal type of breathing may occur without the attendant blood changes. 5. The characteristic type of response to increase in CO2 tension is an increased rather than a decreased depth of respiration.

Thermodynamic considerations of arteriovenous gradients of hydrogen ion concentration and carbon dioxide tension

2000 ◽  
Vol 37 (2) ◽  
pp. 114-118 ◽  
Author(s):  
Emmanuel T Rakitzis
Keyword(s):  
Heart Failure ◽  
Carbon Dioxide ◽  
Congestive Heart Failure ◽  
Free Energy ◽  
Carbon Dioxide Tension ◽  
Hydrogen Ion ◽  
Free Energy Change ◽  
Ion Concentration ◽  
Energy Change ◽  
Hydrogen Ion Concentration

It is shown that, in a multicompartmental homeostatic system, the extent of interaction between any two compartments can be assessed by determination of the difference in free energy change of one particular reaction, or a series of coupled reactions, operative in both of the compartments under consideration. Hydrogen ion concentration and carbon dioxide tension have been used to determine free energy change difference relationships between the venous and arterial compartments (- G(a-v)) of the circulatory system. Data from the literature (from two studies of congestive heart failure and one study of experimentally induced cardiac arrest) are used to calculate - G(a-v). It was found that in control subjects - G(a-v) is close to zero, whereas in congestive heart failure or cardiac arrest, the value rises to 150 calmol-1 or more, whereas in blood, the approach towards equilibrium between hydrogen and bicarbonate ions and dissolved carbon dioxide (aqueous CO2) is known to be only moderately rapid. It is concluded that, in the system under study, and with respect to the reaction H+ + HCO3- = CO2 + H2O, a high value for the free energy change difference between the two compartments (high - G(a-v)) must be due to an insufficient blood circulation rate. Accordingly, - G(a-v) is probably a quantitative measure of cardiac insufficiency.

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