Living creatures emit a range of frequencies, also called bandwidth. As they age, the bandwidth shrinks. When they die sometimes all that is left is a single frequency.
Most of the organisms listed below are dead on commercially available and prepared slides (see Sources for biological supply companies). However they still exhibit a 5 KHz bandwidth, probably due to testing with a frequency generator that was only accurate to 100 Hz, and also due to using more voltage than necessary (like when a powerful radio station comes in at its own frequencies and ones nearby, too). some testing was done with a more accurate frequency generator at a lower power level so some bandwidths are reported much more narrowly.
If the same person retests the same specimens with the same equipment within a few days, the results will be absolutely identical (within 1 Hz) 90% of the time. Why a few of the results will not be identical is not known. However different people, and even the same person at different times of the year, can notice that the perceived frequencies shift by as much as 3 KHz (still less than 1% change).
some specimens have more than one range listed; this may be characteristic of the organism or may be due to having an undocumented organism on the same microscope slide.
Blank locations represent organisms for whom there are prepared slides available, but whose bandwidth has not been determined.
Bandwidth Of Organism Families
In general, the smaller the organism the lower the frequency and narrower the bandwidth. This chart shows the major families studied and where they fall in the spectrum.
Frequency (KHz) 400 600
Protozoa, Round worm, Flatwm
Fig. 90 Chart of bandwidths for organism families.