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Animal and Human Calorimetry by J. A. McLean

By J. A. McLean

This quantity presents a entire survey of the idea, perform, and strategies of calorimetry as utilized to the learn of power metabolism in people and animals. Calorimetry is used to estimate dietary specifications of guy and farm cattle and to guage assorted meals. it's also a robust instrument utilized in examine into basic dietary and physiological lifestyles tactics and within the overview of stresses imposed through irregular or critical environments. it's presently being utilized in a variety of branches of clinical examine and will be used as a diagnostic software in hospitals for research of metabolic issues. The authors talk about either direct calorimetry, which measures warmth loss at once, and oblique calorimetry, the place warmth loss is inferred by means of size of a few of the chemical byproducts of metabolism. moreover, information is supplied to the instrumentation, technical difficulties, and precautions essential to receive actual calorimetric measurements.

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25 for the conversion from urinary nitrogen to protein. In 1958 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 committee's recommendations were endorsed at a subsequent symposium and their report (Brouwer, 1965) is reproduced in Appendix III. 7, have gained widespread acceptance as being applicable to metabolic measurements on farm animals.

Room air was continuously drawn through the system of absorption bottles and the animal chamber by a pump. Carbon dioxide was removed in absorber 1 and water vapour in absorber 2. Any water vapour given off by the animal in the chamber {Ch) was removed by absorber 3, and any carbon dioxide by absorbers 4 and 5. Water vapour produced by the animal was found from the weight increase of absorber 3, and carbon dioxide from that of 4 and 5 combined. Since neither hydrogen nor carbon had been lost or gained by the combined bottles Ch, 3, 4 and 5 the net weight gain of these represented the oxygen consumed by the animal.

However, none of these methods could attain the rapid and close matching of temperatures in the system and jacket necessary for truly accurate adiabatic bomb calorimetry. In 1916 Daniels finally achieved this by placing heating elements in the water jacket and making the whole jacket become a conductor. 01 °C achieved. In 1957 Raymond, Canaway & Harris automated this temperature control system and produced an adiabatic bomb calorimeter which became the basis for the current commercially available systems.

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