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It must be appreciated that the oxidation of a particular substrate at a given time represents but a step in the chain of reactions whose overall effect is the combustion of a protein-fatcarbohydrate mixture; also that both catabolic and anabolic processes are nearly always occurring simultaneously. In the First Symposium on Energy Metabolism sponsored by the European Association for Animal Production appointed a committee to consider and recommend constants and factors for use in metabolic calculations. The estimation of oxygen consumption could be improved if spirometer and barometric pressure readings were taken more frequently and the STPD adjusted volume computed between each set of readings. Respiratory measurements using a mask system allowed calculation of heat production, metabolic water and metabolic weight losses. When the burette was almost full of water the levelling bulb was placed in a position so that its water level was slightly above that of the burette. Circuit A is a simple by-pass and includes a gas sampling loop with a three-way valve. Calibration of pressure-sensitive oxygen analysers by the variable-pressure method 7.

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Animal and Human Calorimetry

Although the mineral status of the body may be nearly stable in unproductive adults, major changes occur during phases of skeletal growth, pregnancy and lactation. In their gradient-layer calorimeter for man Benzinger et al. These are determined from the results of combustion of the materials in a bomb calorimeter. The procedure was repeated to give the desired number of replicate estimates. Newer methods based on algebraic analysis of the calculation procedures are shorter and more versatile. Unfortunately Consolazio et al.

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