THE RESPONSE OF POTATO TUBERS TO A PERIOD OF ANAEROBIOSIS: I. DRIFTS IN CARBON DIOXIDE PRODUCTION

1953 ◽  
Vol 31 (1) ◽  
pp. 33-62
Author(s):  
Dorothy F. Forward
Keyword(s):  
Carbon Dioxide ◽  
Carbon Dioxide Production ◽  
Stable Form ◽  
Constant Ratio ◽  
Potato Tubers ◽  
Permanent Displacement ◽  
Metabolic State ◽  
Effect Change ◽  
Carbon Dioxide Output ◽  
After Effect

A survey of the course of carbon dioxide output of potato tubers upon transfer from air to nitrogen shows that the form of drift in nitrogen undergoes metamorphosis with the lapse of time between harvest and the anaerobic experience. A stable form is attained about three months from harvest.On restoration of air after nitrogen a temporary outburst of carbon dioxide occurs, and both form and magnitude of this after-effect change with time elapsed after harvest. The magnitude is also influenced by the duration of anaerobiosis. At any season, increased time in nitrogen produces an increased after-effect of more than proportionate magnitude. The rate of carbon dioxide output in air after nitrogen ultimately becomes steady, but is not necessarily equivalent to that preceding anaerobiosis. For the space of about three months, subjecting a tuber to nitrogen for two days or more at 22 °C. causes the ultimate rate of carbon dioxide output in air to remain well above that preceding anaerobiosis, while it bears a constant ratio to the final rate in nitrogen before air was restored. This permanent displacement of the rate in air is not at any time brought about by an anaerobic period of only one day.The nature of the drifts in metabolic state of the tubers that underlie these metamorphic changes in response to a period of anaerobiosis is still under investigation.

Respiratory activity of fungal associations in zones of heart rot and stain in sugar maple

1968 ◽  
Vol 46 (1) ◽  
pp. 27-36 ◽  
Author(s):  
H. M. Good ◽  
J. T. Basham ◽  
S. D. Kadzielawa
Keyword(s):  
Carbon Dioxide ◽  
Moisture Content ◽  
Sugar Maple ◽  
Central Area ◽  
Central Zone ◽  
Total Activity ◽  
Carbon Dioxide Production ◽  
Transition Zones ◽  
Carbon Dioxide Output ◽  
Fungal Associations

Some of the progressive changes in decay in maple trees were studied by comparing total activity of the decay community (as measured by carbon dioxide output of excised samples), water content, pH, and predominant microorganisms (as shown by isolation on malt agar) in zones selected across the pocket of decay.Four trees from which Fomes igniarius were isolated gave consistent results with alkaline pH, high moisture content, and a predominance of imperfect fungi in the zones of incipient decay. Surprisingly, these zones showed the highest rates of carbon dioxide output, though they were only slightly higher than those of the transition zones. The center, severely decayed, parts of the trees were slightly acid, appreciably drier, and contained F. igniarius in abundance. They showed only about half the rate of carbon dioxide production of the outer zones. A section of rot caused by Polyporus glomeratus corresponded in most respects to those with F. igniarius.In samples of two regions from which no basidiomycete decay fungus was isolated, the pattern was completely different. In these the pH was consistently alkaline all across the pocket, exceeding pH 9 in one central area, and was highest in the central zone. The moisture content of these two trees was very high, being highest in the central zones, and the carbon dioxide production was much higher than that of the F. igniarius decays.

STUDIES ON THE METABOLISM OF CEREAL GRAINS: III. THE INFLUENCE OF ATMOSPHERIC HUMIDITY AND MOULD INFECTION ON THE CARBON DIOXIDE OUTPUT OF WHEAT

1944 ◽  
Vol 22c (4) ◽  
pp. 150-161 ◽  
Author(s):  
William Leach
Keyword(s):  
Carbon Dioxide ◽  
Relative Humidity ◽  
Carbon Dioxide Production ◽  
Cereal Grains ◽  
Atmospheric Humidity ◽  
Experimental Procedure ◽  
Carbon Dioxide Output ◽  
Micro Organisms

Under the experimental procedure used in these researches it was found that wheat, when kept at 25 °C. in atmospheres of relative humidities between approximately 92 and 100%, showed a continuously accelerating rate of carbon dioxide output. This acceleration of rate increased as the relative humidity of the surrounding air was increased and was more pronounced in wheat from which the germs had been removed than in undamaged wheat. Where unlimited absorption of water and germination of the wheat are prevented, the carbon dioxide production by the grain is due almost entirely to the respiration of micro-organisms that infect it.

Global carbon dioxide output of volcanic lakes in the Azores archipelago, Portugal

2021 ◽  
pp. 106835
Author(s):  
César Andrade ◽  
Fátima Viveiros ◽  
J. Virgílio Cruz ◽  
Rui Coutinho
Keyword(s):  
Carbon Dioxide ◽  
Azores Archipelago ◽  
Carbon Dioxide Output ◽  
Volcanic Lakes ◽  
Global Carbon

Metabolism during normoxia, hyperoxia, and recovery in newborn rats

1992 ◽  
Vol 70 (3) ◽  
pp. 408-411 ◽  
Author(s):  
Peter B. Frappell ◽  
Andrea Dotta ◽  
Jacopo P. Mortola
Keyword(s):  
Carbon Dioxide ◽  
Oxygen Consumption ◽  
Metabolic Rate ◽  
Carbon Dioxide Production ◽  
Oxygen Availability ◽  
Aerobic Metabolism ◽  
Newborn Rats ◽  
Ambient Temperatures ◽  
Positive Effects

Aerobic metabolism (oxygen consumption, [Formula: see text], and carbon dioxide production, [Formula: see text]) has been measured in newborn rats at 2 days of age during normoxia, 30 min of hyperoxia (100% O2) and an additional 30 min of recovery in normoxia at ambient temperatures of 35 °C (thermoneutrality) or 30 °C. In normoxia, at 30 °C [Formula: see text] was higher than at 35 °C. With hyperoxia, [Formula: see text] increased in all cases, but more so at 30 °C (+20%) than at 35 °C (+9%). Upon return to normoxia, metabolism readily returned to the prehyperoxic value. The results support the concept that the normoxic metabolic rate of the newborn can be limited by the availability of oxygen. At temperatures below thermoneutrality the higher metabolic needs aggravate the limitation in oxygen availability, and the positive effects of hyperoxia on [Formula: see text] are therefore more apparent.Key words: neonatal respiration, oxygen consumption, thermoregulation.

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