Download Animal and Human Calorimetry by J. A. McLean PDF

By J. A. McLean

ISBN-10: 0521309050

ISBN-13: 9780521309059

This quantity offers a complete survey of the idea, perform, and methods of calorimetry as utilized to the examine of power metabolism in people and animals. Calorimetry is used to estimate dietary specifications of guy and farm farm animals and to guage diversified meals. it's also a robust software utilized in examine into primary dietary and physiological existence procedures and within the evaluate of stresses imposed by way of irregular or serious environments. it's at present being utilized in a variety of branches of scientific study and will be used as a diagnostic device 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. furthermore, information is equipped to the instrumentation, technical difficulties, and precautions essential to receive exact calorimetric measurements.

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Example text

2. Calibration of an adiabatic bomb calorimeter by means of known quantities of benzoic acid. 40 r- 30 £ 20 8 10 I 1 I 2 3 Temperature rise (°C) 28 Calorific equivalents the range 0-40 kJ; a regression of the energy liberated on the temperature rise of the system gives the heat capacity (Fig. 2). g. the quantity of water or the length of fuse) the measurement must be repeated. Once the heat capacity is known, samples of other materials can be burned and from the weight of sample and the temperature rise the energy density of the sample can be calculated.

1 kcal/g) used by Magnus-Levy and later writers in estimating metabolic rate is lower than those published subsequently. 2. Cathcart & Cuthbertson (1931) made careful analyses of fat from human cadavers. They confirmed (approximately) the values previously reported for adipose tissue but found different values for liver and muscle fat. They argued that since it is the liver and muscle fat that is most readily mobilised, the values for fat from these regions are more appropriate for use in estimating heat production.

1958) the temperature gradient was measured not across a still-air gap or kapok lining, but across a thin plastic (plexiglass) sheet. A series of very many interlaced thermocouples all connected in series measured the mean temperature gradient across this thin sheet which formed a complete internal lining over all surfaces of the chamber. The output voltage from the thermocouple network gave an accurate and rapidly responding measurement of the non-evaporative heat output from the subject. Using a series of heat exchangers lined with similar gradient layers, which he called platemeters, Benzinger was also able to measure the evaporative heat losses from his subjects.

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