RELATION OF OXYGEN PRESSURE AND TEMPERATURE TO GROWTH AND CARBON-DIOXIDE PRODUCTION IN THE FUNGUS POLYSTICTUS VERSICOLOR

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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Validation of carbon dioxide production (VCO2) as a tool to calculate resting energy expenditure (REE) in mechanically ventilated critically ill patients: a retrospective observational study

Critical Care ◽

10.1186/s13054-018-2108-8 ◽

2018 ◽

Vol 22 (1) ◽

Cited By ~ 11

Author(s):

I. Kagan ◽

O. Zusman ◽

I. Bendavid ◽

M. Theilla ◽

J. Cohen ◽

...

Keyword(s):

Carbon Dioxide ◽

Energy Expenditure ◽

Observational Study ◽

Critically Ill ◽

Critically Ill Patients ◽

Resting Energy Expenditure ◽

Carbon Dioxide Production ◽

Retrospective Observational Study ◽

Mechanically Ventilated ◽

Resting Energy

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Continuous automatic measurement of rhythms in fungal respiration using a gas chromatograph

Canadian Journal of Botany ◽

10.1139/b73-087 ◽

1973 ◽

Vol 51 (4) ◽

pp. 701-710 ◽

Cited By ~ 5

Author(s):

Roger S. Smith

Keyword(s):

Carbon Dioxide ◽

Agar Medium ◽

Quantitative Measure ◽

Automatic Measurement ◽

Carbon Dioxide Production ◽

Chromatographic Technique ◽

Gas Chromatograph ◽

Growth Chambers ◽

Long Term Measurement

The long-term measurement of aerobic fungal respiration, both on an agar medium and on wood blocks, was possible using a gas-chromatographic technique for the detection of the carbon dioxide. This method was fully automated to analyze gas samples sequentially from eight or more growth chambers, after variable but determined time periods. It provided a precise quantitative measure of the respired carbon dioxide, presented both in the form of punched computer tape and normal printed teleprinter output. This apparatus worked continuously for several years without serious breakdown.The fungi Lentinus lepideus, Lenzites trabea, Poria monticola, and several strains of Coniophora puteana all showed a rhythm in their respiration which was not controlled by temperature or light. The magnitude and frequency of the rhythmical peaks in carbon dioxide production varied between fungi and, although there was considerable variation between different isolates of the same species, the separation of these species of fungi based on their different patterns of respiration was possible.

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