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Appl Environ Microbiol. 1983 August; 46(2): 463-467
Copyright © 1983, American Society for Microbiology. All Rights Reserved.

Inexpensive Flow Microcalorimeter For Measuring Heat Production of Attached and Sedimentary Aquatic Microorganisms

School of Animal Biology, University College of North Wales, Bangor, Gwynedd LL57 2UW, United Kingdom

ABSTRACT

A relatively inexpensive flow microcalorimeter is described which is capable of detecting heat outputs as low as 3 µW (precision, ±2%). Its use is illustrated on river epilithon (0.8 to 6.8 µW cm^–2), river sand (9.8 µW cm^–3), and marine sand (15.3 µW cm^–3); however, it could be used to detect the heat output from any biotic material over which a flow of water can be passed, provided that such an action would not be disruptive to chemical and biological equilibria.

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