Measurements on two mould fungi with a calorespirometric method

Calorimetric determination of metabolic heat, CO2 rates and the calorespirometric ratio of soil basal metabolism

“…The decay of ϕ with time may be due to exhaustion of the labile carbon or to changes of O 2 partial pressure in the soil during the measurement (Wadsö et al, 2004).…”

“…Of the three measured variables, the ratio ϕ/R CO2 exhibits the most variability with soil. About half of the samples have ϕ/R CO2 values typical of aerobic degradation of carbohydrates (−260 to −460 kJ mol −1 ) (Edelstein et al, 2001;Hansen et al, 2004;Wadsö et al, 2004). Three samples (CAROCC, TOJOR, PRAOCC) show more negative ϕ/R CO2 values indicating more reduced substrates or incomplete conversion of substrate to CO 2 .…”

Calorespirometry of terrestrial organisms and ecosystems

“…However, there are disturbances when the vial of absorbent is inserted or removed from the calorimeter ampoule. To avoid this disturbance, it is possible to use two calorimeters: one for the sample and one for the absorbent [8,23,26] with the ampoules connected by a tube to allow for gas exchange. However, because the two calorimeters must be thermally isolated, the tube between the sample vessel and the absorbent vessel tends to be rather long, and thus has a high diffusive resistance.…”

“…Note that R O2 and R CO2 are equivalent to the terms OUR (oxygen uptake rate) and CER (carbon dioxide evolution rate), respectively. Calorespirometry has been used on many different types of biological systems, see for example the following references dealing with mammalian tissue [4], insects [5], plant tissues [6], mammalian cells [4], aquatic microorganisms [7], mold fungi [8], soil [9] and fish [10].…”

Impact of temperature on growth and metabolic efficiency ofPenicillium roqueforti- correlations between produced heat, ergosterol content and biomass

“…Heat production by mould growth was measured by isothermal calorimetry as in our previous studies (Wadsö et al 2004;Li et al 2007). The thermal power measured from biological samples is produced by the biochemical reactions of their metabolism.…”