In the Hornbostel-Sachs classification system, it is a membranophone. Drums consist of at least one membrane, called a drumhead or drum skin, that is stretched over a shell and struck, either directly with the player's hands, or with a drum stick, to produce sound.
Heat production can be calculated from a measurement of VO 2 and/or CO 2. Doubly-Labeled Water Doubly-labeled water contains isotopes of oxygen and of hydrogen. The technique involves the consumption by the patient of the doubly-labeled water then the measurement of the amount of isotope in the person after a washout period of 7- 14 days. Most of the hydrogen and oxygen isotopes are lost through excretion and evaporation, but some of the oxygen isotope equilibrates with carbon dioxide and is expired in air.
Have your well water tested through a certified lab to make sure there is not a health problem. Tests usually identify potential health problems but may not detect odor-causing bacteria. The lab lets you know if water is safe to drink. If it is safe but smells bad, you can probably reduce or eliminate the odor. Odor-producing bacteria are often referred to as iron or sulfur-reducing bacteria.