Difference between revisions of "Gnaiger 1987 Physiol Zool"
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|journal=Physiol. Zool. | |journal=Physiol. Zool. | ||
|mipnetlab=AT_Innsbruck_GnaigerE | |mipnetlab=AT_Innsbruck_GnaigerE | ||
|abstract= | |abstract=Anoxic heat dissipation of Lumbriculus variegatus, as measured by direct calorimetry, is reduced by up to 85% relative to aerobic rates. The decrease of anoxic heat dissipation and the diminution of activity peaks in the calorimetric output coincide with the disappearance of peristaltic movements under anoxia. A transfer from aerobic conditions with food to anoxia without food results in cessation of defecation when the gut is half emptied, whereas the gut is completely emptied under aerobic conditions within 6 and 8-10 h at 20 and 11 C, respectively. The aerobic retention time of the food is independent of worm length (10-50 mm). After aerobic feeding the gut content is higher than after anoxic feeding at 6 C. On return to aerobic conditions, heat dissipation increases immediately, whereas defecation is resumed only after a lag of 2 h. An anoxic component to the aerobic heat dissipation becomes apparent in relation to simultaneous respirometric measurements when feces accumulate in the calorimetric chamber. When the guts are completely emptied before the experiment, the theoretical oxycaloric equivalent yields an accurate estimate of heat dissipation, indicating that no significant net formation of anoxic end products occurs under aerobic conditions. Anoxic catabolism of glycogen may not fully explain the directly measured rates of heat dissipation under environmental anoxia. This has been suggested earlier for Lumbriculus and has since been confirmed for Tubifex on the basis of simultaneous calorimetric and biochemical measurements. Direct calorimetry is required to assess total rates of metabolic energy expenditure in anoxic oligochaetes. | ||
|keywords=Twin-Flow | |keywords=Twin-Flow | ||
|info=[http://www.journals.uchicago.edu/doi/abs/10.1086/637946 Physiol. Zool. 60: 659-677.] | |info=[http://www.journals.uchicago.edu/doi/abs/10.1086/637946 Physiol. Zool. 60: 659-677.] | ||
Revision as of 11:27, 16 September 2010
| Gnaiger E, Staudigl I (1987) Aerobic metabolism and physiological responses of aquatic oligochaetes to environmental anoxia. Heat dissipation, oxygen consumption, feeding and defecation. Physiol. Zool. 60: 659-677. |
Gnaiger E, Staudigl I (1987) Physiol. Zool.
Abstract: Anoxic heat dissipation of Lumbriculus variegatus, as measured by direct calorimetry, is reduced by up to 85% relative to aerobic rates. The decrease of anoxic heat dissipation and the diminution of activity peaks in the calorimetric output coincide with the disappearance of peristaltic movements under anoxia. A transfer from aerobic conditions with food to anoxia without food results in cessation of defecation when the gut is half emptied, whereas the gut is completely emptied under aerobic conditions within 6 and 8-10 h at 20 and 11 C, respectively. The aerobic retention time of the food is independent of worm length (10-50 mm). After aerobic feeding the gut content is higher than after anoxic feeding at 6 C. On return to aerobic conditions, heat dissipation increases immediately, whereas defecation is resumed only after a lag of 2 h. An anoxic component to the aerobic heat dissipation becomes apparent in relation to simultaneous respirometric measurements when feces accumulate in the calorimetric chamber. When the guts are completely emptied before the experiment, the theoretical oxycaloric equivalent yields an accurate estimate of heat dissipation, indicating that no significant net formation of anoxic end products occurs under aerobic conditions. Anoxic catabolism of glycogen may not fully explain the directly measured rates of heat dissipation under environmental anoxia. This has been suggested earlier for Lumbriculus and has since been confirmed for Tubifex on the basis of simultaneous calorimetric and biochemical measurements. Direct calorimetry is required to assess total rates of metabolic energy expenditure in anoxic oligochaetes. • Keywords: Twin-Flow
• O2k-Network Lab: AT_Innsbruck_GnaigerE
Labels:
Stress:Hypoxia Organism: Other Non-Mammal"Other Non-Mammal" is not in the list (Human, Pig, Mouse, Rat, Guinea pig, Bovines, Horse, Dog, Rabbit, Cat, ...) of allowed values for the "Mammal and model" property.
Preparation: Intact Organism"Intact Organism" is not in the list (Intact organism, Intact organ, Permeabilized cells, Permeabilized tissue, Homogenate, Isolated mitochondria, SMP, Chloroplasts, Enzyme, Oxidase;biochemical oxidation, ...) of allowed values for the "Preparation" property.
Regulation: Respiration; OXPHOS; ETS Capacity"Respiration; OXPHOS; ETS Capacity" is not in the list (Aerobic glycolysis, ADP, ATP, ATP production, AMP, Calcium, Coupling efficiency;uncoupling, Cyt c, Flux control, Inhibitor, ...) of allowed values for the "Respiration and regulation" property., Aerobic and Anaerobic Metabolism"Aerobic and Anaerobic Metabolism" is not in the list (Aerobic glycolysis, ADP, ATP, ATP production, AMP, Calcium, Coupling efficiency;uncoupling, Cyt c, Flux control, Inhibitor, ...) of allowed values for the "Respiration and regulation" property.
HRR: CaloRespirometry; Twin-Flow"CaloRespirometry; Twin-Flow" is not in the list (Oxygraph-2k, TIP2k, O2k-Fluorometer, pH, NO, TPP, Ca, O2k-Spectrophotometer, O2k-Manual, O2k-Protocol, ...) of allowed values for the "Instrument and method" property.
