Initiation of Anaerobic Metabolism of Mammalian Spermatozoa by Carbon Dioxide

Nature ◽  
1962 ◽  
Vol 195 (4838) ◽  
pp. 293-294 ◽  
Author(s):  
J. R. LODGE ◽  
G. W. SALISBURY
Keyword(s):  
Carbon Dioxide ◽  
Anaerobic Metabolism ◽  
Mammalian Spermatozoa

scholarly journals MEASUREMENTS OF THE METABOLISM OF TWO PROTOZOANS

1929 ◽  
Vol 13 (2) ◽  
pp. 153-158 ◽  
Author(s):  
Robert Emerson
Keyword(s):  
Carbon Dioxide ◽  
Respiratory Quotient ◽  
Anaerobic Metabolism ◽  
Amoeba Proteus

1. The respiration of Amoeba proteus was measured. 10 c. mm. of cells were found to use about 1.6 mm.3 of oxygen per hour at 20°C. The respiratory quotient was found to be nearly unity. 2. No anaerobic metabolism was found for Amoeba. 3. The respiration of Blepharisma was found to be from 3 to 7 mm.3 oxygen per hour for 10 mm.3 cells. The respiratory quotient was about 1. 4. Blepharisma was shown to have a definite anaerobic metabolism. 80 mm.3 cells caused the evolution of 12.5 mm.3 carbon dioxide per hour at 20°C. in the presence of bicarbonate.

Anaerobic Metabolism During Cardiopulmonary Bypass: Predictive Value of Carbon Dioxide Derived Parameters

2006 ◽  
Vol 81 (6) ◽  
pp. 2189-2195 ◽  
Author(s):  
Marco Ranucci ◽  
Giuseppe Isgrò ◽  
Federica Romitti ◽  
Sara Mele ◽  
Bonizella Biagioli ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Cardiopulmonary Bypass ◽  
Predictive Value ◽  
Anaerobic Metabolism

scholarly journals Effect of Modified Atmosphere Composition on the Metabolism of Glucose by Brochothrix thermosphacta

2002 ◽  
Vol 68 (9) ◽  
pp. 4441-4447 ◽  
Author(s):  
Carmen Pin ◽  
Gonzalo D. García de Fernando ◽  
Juan A. Ordóñez
Keyword(s):  
Carbon Dioxide ◽  
Logistic Regression ◽  
Lactic Acid ◽  
Anaerobic Metabolism ◽  
Modified Atmosphere ◽  
Carbon Dioxide Content ◽  
Atmosphere Composition ◽  
End Products ◽  
Brochothrix Thermosphacta ◽  
Lactic Acids

ABSTRACT The influence of atmosphere composition on the metabolism of Brochothrix thermosphacta was studied by analyzing the consumption of glucose and the production of ethanol, acetic and lactic acids, acetaldehyde, and diacetyl-acetoin under atmospheres containing different combinations of carbon dioxide and oxygen. When glucose was metabolized under oxygen-free atmospheres, lactic acid was one of the main end products, while under atmospheres rich in oxygen mainly acetoin-diacetyl was produced. The proportions of the total consumed glucose used for the production of acetoin (aerobic metabolism) and lactic acid (anaerobic metabolism) were used to decide whether aerobic or anaerobic metabolism predominated at a given atmosphere composition. The boundary conditions between dominantly anaerobic and aerobic metabolisms were determined by logistic regression. The metabolism of glucose by B. thermosphacta was influenced not only by the oxygen content of the atmosphere but also by the carbon dioxide content. At high CO2 percentages, glucose metabolism remained anaerobic under greater oxygen contents.

PHYSIOLOGY OF WOOD-ROTTING BASIDIOMYCETES: IV. RESPIRATION OF NON-PROLIFERATING CELLS OF POLYPORUS PALUSTRIS

1962 ◽  
Vol 8 (1) ◽  
pp. 145-156 ◽  
Author(s):  
Harvey R. Newcomb ◽  
Marshall W. Jennison
Keyword(s):  
Carbon Dioxide ◽  
Fatty Acids ◽  
Anaerobic Metabolism ◽  
Aerobic Respiration ◽  
Endogenous Respiration ◽  
Shake Culture ◽  
Sugar Alcohols ◽  
Proliferating Cells ◽  
Mycelial Pellets ◽  
Manometric Studies

For manometric studies of respiration, small, whole mycelial pellets of Polyporus palustris grown in submerged (shake) culture were much superior to fragmented mycelium. The rates of endogenous and of exogenous respiration were dependent, in part, upon age of culture, and were maximal at pH 5.5. The endogenous respiration was high but could be reduced by starvation (aeration in a non-nutrient medium), permitting measurement of exogenous respiration upon the addition of oxidizable substrate. Of the carbohydrates studied, xylose, glucose, galactose, and sucrose were the most stimulative to aerobic respiration; rhamnose, melezitose, and lactose either were not oxidized or showed only slight stimulation. The alcohols methanol, ethanol, glycerol, and propylene glycol were readily utilized; inositol was oxidized to a lesser degree. The sugar alcohols mannitol, sorbitol, and adonitol were mildly stimulative; the effect of dulcitol was dependent upon its concentration. The fatty acids acetate and caprylate were much more readily utilized than butyrate. Salts of other acids— oxalate, pyruvate, lactate, and fumarate—were oxidized to about the same extent as butyrate. Non-proliferating cells of P. palustris had a definite anaerobic metabolism and fermented glucose with production of carbon dioxide and small amounts of acid(s). In air, oxidative assimilation of glucose was high (79–91%); endogenous respiration apparently was not suppressed during assimilation.

scholarly journals ACTION OF REDUCED OXYGEN AND ELEVATED CARBON DIOXIDE ON ANAEROBIC METABOLISM OF `BARTLETT' PEARS

HortScience ◽  
1992 ◽  
Vol 27 (6) ◽  
pp. 603f-603
Author(s):  
A.A. Kader ◽  
D. Ke ◽  
M. Mateos ◽  
E. Yahia
Keyword(s):  
Carbon Dioxide ◽  
Alcohol Dehydrogenase ◽  
Ethyl Acetate ◽  
Anaerobic Metabolism ◽  
Pyruvate Decarboxylase ◽  
Elevated Carbon Dioxide ◽  
Pyrus Communis ◽  
Controlled Atmosphere ◽  
Air Control ◽  
Adh Activity

Fruits of `Bartlett' pear (Pyrus communis L.) at green (preclimacteric) and yellow (postclimacteric) stages were kept in 0.25% O2 (balance N2), 80% CO2 (balance O2), or 0.25% O2 + 80% CO2 (balance N2) for 1, 2, or 3 days followed by transfer to air at 20C for 3 days to study the effects of these controlled atmosphere (CA) treatments on anaerobic products and enzymes. All the three CA treatments caused greater accumulation of ethanol, acetaldehyde, and ethyl acetate than the air control. The postclimacteric pears were more sensitive to CA treatments as indicated by occurrence of skin browning, enhanced activity of pyruvate decarboxylase, and higher concentrations of the anaerobic volatiles. For the preclimacteric pears, the 0.25% O2 treatment dramatically increased alcohol dehydrogenase (ADH) activity, which was associated with the induction of one ADH isozyme. Exposure of preclimacteric pears to 80% CO2 slightly increased ADH activity while treatment with 0.25% O2 + 80% CO2 resulted in lower AD11 activity than 0.25% O2 alone.

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